VARISCO J User manual

Instructions for the
installation, use and
maintenance of self-priming
centrifugal pumps
JJ
JJ
GB


Before starting the pump read this instruction manual carefully
The pump has been thoroughly tested for several hours before delivery
and the performance has been checked and certified within acceptable
limits.
If the instructions for use and maintenance are observed, the pump will
give full performance for a long time. This manual also contains
information for the prevention and elimination of most common
operating problems.
2

CONTENTS
1 IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pag. 4
1.1 Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Type of pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Year of manufacture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Instruction book identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 Nameplate information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.7 Field of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.8 In case of breakdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 GENERAL INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 SAFETY AND ACCIDENT PREVENTION INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 IN CASE OF EMERGENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6 HANDLING AND TRANSPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.1 Method of transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
8 ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
9 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.2 Pipework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
10 ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
11 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12 STARTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12.1 Mechanical seal check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12.1.1 Pumps with type TW or T4W mechanical seals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12.1.2 Pumps with type T mechanical seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
12.1.3 Pumps with type TCW - TC8W mechanical seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
12.2 Filling the pump casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
12.3 Priming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
13 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
13.1 Inspection and checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
13.2 Replacing the impeller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
14.3 Replacing the wear plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
13.4 Replacing the check valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
13.5 Replacing the mechanical seal T, TW, T4W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
13.6 Replacing the mechanical seal TCW, TC8W cartridge seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
13.7 Positioning the impeller with reference to the wear plate(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
13.8 Maintenance of the bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
13.9 Replacing the bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
13.10 Replacing the TWIN-DISC coupling blocks (RBD series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
13.11 Replacing the rubber collar of SURE-FLEX couplings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
13.12 Replacing the rubber dowels of GFB BALBONI flexible couplings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
14 OPERATING PROBLEMS: CAUSES AND REMEDIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
14.1 The pump does not prime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
14.2 The pump does not deliver liquid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.3 The pump does not have sufficient capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.4 The pump does not provide enough pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.5 The pump absorbs too much power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.6 The pump vibrates and is noisy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.7 The pump jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.8 The bearings have a short lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.9 The mechanical seal leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
14.10 The seal overheats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
14.11 The elastomer portions of the flexible coupling wear out quickly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
15 RESIDUAL RISKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
16 REPAIRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
17 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
17.1 Removing the pump from the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
18 ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
18.1 Mounting the pump in the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
19 SPARE PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
19.1 Ordering spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
20 DISPOSAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3

1 IDENTIFICATION
1.1 Manufacturer:
Varisco Pompe S.r.l., Zona Industriale Nord, Terza Strada 9, 35129 PADOVA, Italy
1.2 Type of pump
Horizontal self-priming centrifugal pump with open impeller for handling liquids containing solids in suspension. These pumps can operate
satisfactorily with liquids containing air or dissolved gases.
1.3 Model
The type of pump is shown on the pump name plate.
1.4 Year of manufacture
The year of manufacture is indicated on the pump name plate.
1.5 Instruction book identification
Prepared: January Edition: 04 Revision: 00 Date of revision:
1.6 Nameplate information
The values shown for the capacity (m3/h), head (m), power (kW) and speed (RPM) refer to testing with water at 20° C and density
1000 kg/m
1.7 Field of application
The pumps are suitable for handling liquids of viscosity up to 50 cSt containing solids in suspension. They are used in industry, civil
engineering, shipbuilding, waste water treatment, construction and agriculture.
1.8 In case of breakdown
Contact the nearest Varisco distributor (see list on pages 5, 6) or the Varisco factory:
Phone: + 39 049 82 94 312
Fax: + 39 049 80 76 762
2 WARRANTY
-The manufacturers guarantee that only high quality materials are used in the construction of their pumps and that machining and assembly
are carried out to high standards.
-The pumps are guaranteed against defective materials or faulty workmanship for a period of one year from the date of delivery unless
specifically stated otherwise in writing.
-The guarantee applies to pumps used for up to 8 hours per working day.
- The warranty is not valid if the pump has been tampered with by third parties.
-Replacement of parts or of the pump itself can only be carried out after careful examination of the pump in an authorised workshop by
qualified personnel. The pump should be sent carriage paid.
-This guarantee does not cover parts subject to deterioration or normal wear and tear (seals, diaphragms, pressure and vacuum gauges,
rubber or plastic items, etc.) or damage caused by misuse or improper handling of the pump by the end user.
-Parts replaced under guarantee become the property of the manufacturers.
3 GENERAL INSTRUCTIONS
The goods must be examined on arrival to ascertain any damage caused during shipment. Loss or damage must be notified immediately to
the carriers and to the sender. Check that the goods correspond exactly to the description on the shipping documents and report any
differences as soon as possible to the sender. Always quote the pump type and serial number.
The pumps must be used only for applications for which the manufacturers have specified:
- the construction materials
- the operating conditions (pressure, speed, temperature, etc.)
- the field of application
In case of doubt, contact the manufacturers or an authorised distributor
[phone]
4
TYPE
identifies the model of the
pump and/or unit (pump/gear
box/motor etc.)
TYPE
MATR. ITEM
m3/h (max) m (max) kW RPM (max) kg
MATR.
the serial
number of
the pump
ITEM
the number which links the pump
to the contract documents (only if
requested)
kg
the weight of the pump or of the
unit, excluding the weight of liquid
in the pump casing and fuel in the
fuel tank.
Year of manufacture
m3/h (max)
the maximum capacity of
the pump, measured at
the maximum speed
m (max)
the closed valve head of
the pump measured at
the maximum speed
kW
the maximum input
power of the pump at the
maximum speed
RPM (max)
the maximum operating rotation
speed of the pump. The pump
must never be run faster than this
speed.

5
4 SAFETY AND ACCIDENT PREVENTION INFORMATION
When working near the pump, dress appropriately, avoiding clothes with loose items (ties,
scarves, etc.) which could get caught in moving parts. Use overalls made according to
safety regulations, gloves, insulating shoes, safety glasses, ear plugs and helmet (fig.1).
Do not carry out maintenance on the engine while it is running.
Keep hands away from moving parts (e.g. belts, couplings, etc.).
Keep hands away from hot areas of the engines (fig. 4).
Do not mount on the pump to carry out maintenance operations of any kind.
5 IN CASE OF EMERGENCY
Turn off the electrical supply (for electrically driven pumps).
Shut off the engine (for engine driven pumps).
Notify the person responsible for running the plant immediately.
6 HANDLING AND TRANSPORT
6.1 Method of transport
The pump must be transported safely.
6.2 Installation
During installation and maintenance, all the components used
must be handled and transported securely by using suitable
slings. Handling must be carried out by specialised personnel to
avoid damage to the pump and to persons. The lifting rings
attached to various components should be used exclusively to
lift the components for which they have been supplied. Figure
(1) highlights in black the lifting points of some typical base
plates.
Maximum lifting speed: Vmax ≤≤0,5 m/s
Do not stand or pass under the pump while it is being
hoisted!(fig.3)
7 STORAGE
Store the pump under cover wherever possible. If the pump
must be stored in the open, cover it with a tarpaulin and grease
the bearings to avoid rusting. (fig. 4).
Avoid the accumulation of moisture around the pump.
Drain the casing through the drain cover (fig. 5) and the rear
plug mounted on some models. During winter months and
cold weather, the liquid could freeze and damage the pump
casing. If the liquid is hazardous, take all necessary
precautions to avoid damage and injury before emptying
the pump casing. From time to time, turn the pump shaft to
avoid encrustation inside the pump
8 ASSEMBLY
If the pump is supplied with bare shaft (pedestal version) it must be coupled to an electric
motor or internal combustion engine, taking account of the following:
- the coupling must be correctly sized for the power to be transmitted
- the coupling must be correctly aligned (see paragraph 9)
- the coupling guard must comply with applicable safety standards
- the rated power of the motor or engine
- the power absorbed by the pump (see the motor name plate)
- the motor or engine speed (see the motor name plate)
- the pump speed
9 INSTALLATION
The base plates of electrically or engine driven pumps must be anchored to a levelled concrete slab in which the foundation bolts have
been buried following the diagram supplied with the unit or available on request. The slab must be robust to absorb any vibrations and
sufficiently rigid to maintain the alignment of the pump to the motor or engine.
For trailer mounted pumps, block the wheels using the two chocks supplied.
9.1 Assembly
While the base plate is being anchored to the slab, check the flatness by placing a spirit level on the delivery flange of the pump.
If adjustments are necessary, the face of the slab must be adapted to the base plate, never the base plate to the slab.
The pump casing must be suitably supported when the pump is coupled to a gear box for agricultural use.
fig. 2
fig.3
fig. 1

fig. 4
fig. 5

6
9.2 Pipework
Clean the pipes thoroughly before connecting them to the pump.
The suction line must have a diameter equal to that of the pump suction port (for diameters greater than that of the pump port, consult
Varisco). If possible, avoid curves, elbows and constrictions which can limit the flow of liquid to the pump. Do not install a foot valve: the
pump has a non return valve (14) incorporated in the suction port (fig. 10).
Install the pump as close as possible to the liquid to be pumped. Try, where possible, to reduce the length of the suction line.
The suction line connections must be completely airtight: check pipe threads, flange gaskets, quick couplings, etc.
The delivery line must let air escape from the system while the pump is priming.
The suction and delivery lines must be mounted in such a way as not to create a strain on the pump casing. Engine driven pumps must
have lengths of flexible hose to isolate the pipework from the vibrations generated by the internal combustion engine
10 ALIGNMENT
Before starting the pump for the first time, it is important to check the alignment between the components of the unit (coupling/
motor).
The alignment of pumps supplied on base plates is checked during manufacture. However, it should be rechecked during installation as
follows:
-set up the base plate on top of the slab and insert the anchor bolts in the holds on the base plate without tightening the nuts completely
-remove the coupling guard.
-tighten the anchor bolt nuts and recheck the alignment as shown in fig.6. Adjust the alignment, if necessary, according to the type of
coupling as described in paragraphs 14.10; 14.11; 14.12.
-replace the coupling guard before starting the pump.
11 ELECTRICAL CONNECTIONS
Electrical connections should only be carried out by specialised personnel.
-Follow the instructions of the manufacturers of the electric motor and electrical equipment.
- Earth the motor correctly and ensure that the electric motor is protected by an adequately rated overload cut-out.
-Three phase electric motors are usually supplied for 380 V (star connection). For 220 V supply, connect the motor terminal box in the delta
configuration as shown in the wiring diagram attached.
-Special voltage motors may be supplied. In this case, follow the instructions supplied with the motor.
- The cross section of the cables must be adequate for the current required by the motor.
-When the motor has been connected, close the delivery line gate valve and check that the direction of rotation is correct.
-The arrow on the pump casing shows the correct direction of rotation (fig.7); if the pump rotates in the opposite direction, interchange two
of the three wires of the supply cable in the terminal box.
On request, pumps for brackish water
can be supplied with galvanic protection
against corrosion. This consists of a
series of zinc discs fixed to the clean
out cover. Check the state of wear of the
zinc every 1000 hours and replace if
necessary.
While the pump is running, check that
the current does not exceed that shown
on the motor name plate.
12 STARTING
Before operating the pump, check that the electrical and mechanical parts of the system have been correctly installed.
Check that all safety devices are operative.
Check that the pump rotates in the correct direction (see paragraph 12).
12.1 Mechanical seal check
Before starting the pump, check the type of mechanical seal shown on the pump name plate.
12.1.1 Pumps with type TW or T4W mechanical seals
Type TW and T4W mechanical seals are filled with grease during assembly. They do not require maintenance during the first 500 hours
of operation of the pump.
12.1.2 Pumps with type T mechanical seals
Type T mechanical seals are not lubricated..
axial
misalignment
radial
misalignment
parallel
misalignment
fig. 6
Star connection Delta connection
fig. 7

7
12.1.3 Pumps with type TCW - TC8W mechanical seals
Type TCW, TC8W mechanical seals are flushed according to API 610 Plan 52-53 (see diagram in fig. 8).
Plan 52 has a non-pressurised tank.
Plan 53 has a pressurised tank with a pressure from 1 to 2 bar higher than the pump operating
pressure.
The flushing liquid must be compatible with the pumped liquid.
12.2 Filling the pump casing
Fill the pump casing completely with the liquid to be pumped through the opening on the top of the
casing (fig. 9). Some models have a plug. When the pump is stopped, the casing does not empty
and therefore it is not necessary to refill it.
12.3 Priming
Attention: if the pump does not prime, do not operate it for more than 2 minutes to avoid
overheating the liquid and damaging the seal.
If the pump does not prime, read paragraph 15.1.
Engine driven pumps should be brought up gradually to running speed. Never change the
accelerator limit stop: at speeds higher than that for which the engine is set, the pump would absorb
more power than the engine can supply.
Never exceed the maximum speed shown on the pump name plate.
When the pump has primed:
-Check the shaft seal for leaks.
-Check that the current absorbed by the motor does not exceed the rated value shown on the name plate.
If the pump does not seem to be operating normally, it must be stopped and the cause found (see paragraph 15).
13 MAINTENANCE
Before maintenance is carried out, the pump must be stopped and the electrical supply disconnected. The supply must only be
switched on again by the person who carries out the maintenance.
Attention: residual liquid may be found in the pump casing, head and suction line. Take the necessary precautions if the liquid is
hazardous, inflammable, corrosive, poisonous, infected, etc.
13.1 Inspection and checks
Check from time to time that the pump is working correctly. Use the instruments mounted in the system (pressure gauge, vacuum gauge,
ammeter, etc.) to see if the pump continues to meet its duty.
Periodic maintenance of the parts subject to wear, in particular, the impeller and wear plate, is recommended.
fig. 8
fig. 9
fig. 10


13.2 Replacing the impeller (03) (fig. 10)
-Drain the pump casing as described in paragraph 8.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
-Unscrew the nuts (52) and remove the pump casing, taking care not to damage the casing gasket (43)
-Block the impeller and unscrew the self-locking impeller nut (33)
-Remove the impeller and replace it with a new one
-If the impeller nut is a dome nut without the nylon self-locking insert, clean the threaded extremity of the shaft carefully and lay two strips
of LOCTITE 243 on two opposite sides of the thread along its entire length before screwing on the nut.
-If necessary, replace the casing gasket (43)
-To reassemble, proceed in reverse order.
-Check that the distance between the impeller and the front wear plate as described in paragraph 14.7
13.3 Replacing the wear plate (fig. 10)
-Empty the pump casing as described in paragraph 8.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
-Unscrew the nuts (52) and remove the pump casing, taking care not to damage the casing gasket (43)
-Unscrew the wear plate screws (57)
-Remove and replace the wear plate (02)
If necessary, replace the casing gasket (43)
-To reassemble, proceed in reverse order
-Check that the distance between the impeller and the front wear plate as described in paragraph 14.7
13.4 Replacing the check valve (fig. 10)
-Empty the pump casing as described in paragraph 8.
Attention: residual liquid may be found inside the pump casing, head and suction line; take all necessary precautions if the liquid is
hazardous (inflammable, corrosive, poisonous, infected, etc.)
-Remove the nuts (52.1)
-Slip off the suction flange (10)
-Slip off the check valve (14)
-Mount the new check valve with the hinge towards the top
-Clean the valve seat of the suction flange (10) and reassemble it
-Some check valves have a tongue which protrudes outside the suction flange. In this case, the weight of the check valve must be borne
while tightening the nuts by pulling this tongue
13.5 Replacing the mechanical seal T, TW, T4W (figs. 10, 11, 12)
-Empty the pump casing as described in paragraph 8.
Attention: residual liquid may be found inside the pump casing, head and suction line; take
all necessary precautions if the liquid is hazardous (inflammable, corrosive, poisonous,
infected, etc.)
-Remove the casing (01) taking care not to damage the casing gasket (43)
-Block the impeller (03) and remove the self-locking impeller nut (33)
-Remove the impeller (3) and impeller key (60)
-Remove the head (19). The rotating part of the seal (40) mounted on the shaft sleeve
(31) will slide off the shaft together with the head
-Remove the stationary seat (39) and its gasket (38) from the head
-Remove the lip seal (41)
-Wash the head with solvent to remove any residue of grease and clean the seats of the
stationary seal and lip seal thoroughly
-Mount a new lip seal in the head.To facilitate assembly, smear a little oil on the seat and
on the outer surface of the lip seal
-Mount the stationary portion of the seal (39) together with its gasket (38). To facilitate
this operation, wet the seat on the head and the gasket with methylated spirits. If
necessary, use a wooden plunger or similar to push the stationary seal (39) into its seat
- Reassemble the head taking care not to touch the shaft with the stationary seal
seat. If this is ceramic, it could easily break or chip
-Tighten the head screws (45) and nuts (45.1)
-Smear the gasket of the rotating seal seat (40) and the shaft sleeve (31) with oil and slip
the seal on to one end of the shaft sleeve
-Slip the sleeve and seal on to the shaft and push to overcome the slight resistance
offered by the lip seal. Take care that the seal does not slip off the shaft sleeve
-Mount the seal support ring (25.1). Push this forward until it is possible to reassemble
the impeller key (60)
-Reassemble the impeller (03), the impeller washer (66) and tighten the impeller nut (33)
-If the impeller nut is a dome nut without the nylon self-locking insert, clean the threaded extremity of the shaft carefully and lay two strips
of LOCTITE 243 on two opposite sides of the thread along its entire length before screwing on the nut.
-Check that the distance between the impeller and the front wear plate as described in paragraph 14.7
-Reassemble the casing gasket after smearing both sides with grease
-Reassemble the casing and tighten the nuts, checking that the impeller is free to rotate
-Fill the seal lubrication chamber (see paragraph 13.1.1, 13.1.2) with grease
fig. 11
fig. 12
8

13.6 Replacing type TCW, TC8W cartridge seals (fig. 10, 13, 14, 15, 16)
-Empty the pump casing as described
in paragraph 8.
Attention: residual liquid may be
found inside the pump casing, head
and suction line; take all necessary
precautions if the liquid is hazardous
(inflammable, corrosive, poisonous,
infected, etc.)
-Unscrew the nuts (52) (fig. 10) and
remove the pump casing, taking
care not to damage the casing
gasket (43)
-Block the impeller (03) and remove
the self-locking impeller nut (33)
-Remove the impeller (03)
-Disconnect the flushing lines.
-Fix the seal lock setting plates (25.4)
in their seats (fig. 13)
-Loosen the grub screws of the shaft
sleeve (fig. 14)
-Unscrew the screws (20.2) which fix
the seal flange to the head (fig. 15)
-Remove the head (19)
-Remove the seal (25), the shaft
sleeve (31), the seal box (20) and the
gasket (20.1)
-If the gasket (20.1) is damaged, replace it
To assemble, proceed in reverse order
-To facilitate the initial assembly of the seal (fig. 18), smear a little oil on the shaft sleeve (31)
-Tighten the fixing screws (20.2) carefully (fig. 15) so as to avoid strain on the stationary seat of the seal
-Tighten the grub screws as far as they will go (fig. 14)
-Remove the setting plates (25.4) which hold the seal (fig. 13) and fix them in the appropriate holes in the flange so that they can be used
again to remove the seal
-Reconnect the flushing lines, begin flushing and bleed out air from the area around the seal. The seal must not run dry even for a few
moments.
13.7 Positioning the impeller with reference to the wear plate(s)
- In all models, the distance between
the top of the impeller blades and the
surface of the wear plate must be
between 0.3 - 0.6 mm (fig. 19). For
the 12" model, the distance between
the impeller and the front and rear
wear plates must be between 0.6 - 1
mm (fig. 22).
To achieve this, dimensions A and B
in figs. 17, 18, 20, 21 must be as
nearly as possible equal. To this end,
use the shims (25.2) (fig. 11)
supplied with spare mechanical
seals. These shims are used to move
the impeller further forward if it is too
far from the front wear plate or too
near the rear wear plate. The shims
should be mounted between the seal
support ring (25.1) (fig. 11) and the
impeller. Further adjustments can be
carried out using casing gaskets (and
rear wear plate gaskets on models
which fit these). The presence of the
casing gasket (43) (fig. 10) 0.5 mm
thick then creates the correct
distance (fig. 19).
13.8 Maintenance of the bearings (fig. 10)
The pump is supplied with the bearings already greased and does not require maintenance for the first 500 hours of operation.
The bearings in the bearing housing must be lubricated appropriately, avoiding the use of too much grease which can cause overheating
and, as a result, damage to the bearings.
13.9 Replacing the bearings
Empty the pump casing
Remove the casing, the head and the mechanical seal
Remove the flexible coupling hub and the shaft key
Remove the outer bearing cover (08)
Extract the shaft from the coupling side
Extract the bearings using a bearing extractor
To reassemble, proceed in reverse order
fig. 14
flushing hole
flushing
hole
wear
plate
impeller
fig. 17 fig. 18 fig. 19
impeller
wear
plates
fig. 21
fig. 22
fig. 20
9
fig. 13
fig. 15
fig. 16

13.10 Replacing the TWIN-DISC coupling blocks (RBD series)
-Remove the pump from its seat
-Remove the worn blocks and replace them with new ones
-Check the state of wear of the aluminium flange
-Couple the pump to the engine
-Maximum alignment error: 0.7 mm
-When ordering spare rubber blocks, specify the shaft diameter and the type of coupling.
13.11 Replacing the rubber collar of SURE-FLEX couplings
-Unscrew the anchor bolts at the base of the pump or motor and separate the two halves
of the coupling
-Remove the worn rubber collar and replace it with a new one. In the case of two piece
rubber collars (type S) leave the steel ring free to move in one of the two grooves near
the indentation
-Move the pump towards the motor and fit the indentation of the half coupling to that of
the rubber collar
-Close the coupling leaving an axial play of 2 mm max. for type J couplings and 3 mm
max. for type S couplings
-Check the radial and angular alignment as follows:
Radial: (fig. 23) with a ruler placed on the outer surface of the half couplings, measure the
maximum misalignment (dimension C) in at least four points around the circumference and
try to bring it as close as possible to zero (see table)
- Angular: (fig. 23) with a gauge, measure at a minimum of four points the distance between
the two halves of the coupling and bring the difference (b-a) as close as possible to zero
(see table)
-Tighten the anchor bolts at the base of the pump and motor
-When ordering spare parts, specify the type of coupling (stamped on the inside of the half
couplings) and the shaft diameter
13.12 Replacing the rubber dowels of BALBONI GFB flexible couplings (fig. 24)
-Unscrew the anchor bolts at the base of the pump or engine and separate the two halves
of the coupling
-Remove the worn dowels and replace them with new ones, fixing them in place with a
little adhesive
-Move the pump towards the engine until the coupling is completely closed, then draw it
back by 2-3 mm to separate the two halves of the coupling
-Tighten the bolts which anchor the pump and engine to the base plate
-When ordering dowels, specify the diameter of the shaft and the type of coupling
14 OPERATING PROBLEMS: CAUSES AND REMEDIES
Attention: before examining the possible causes of operating problems, ensure
that all control instruments (vacuum gauge, pressure gauge, revolution counter,
flow recorder, electrical gauges etc.) are working correctly.
14.1 The pump does not prime
1 The pump casing is empty or non sufficiently full
fill the pump casing through the priming cover or plug (fig. 9)
2 The liquid inside the pump casing is overheated
add cold liquid to the pump casing through the priming cover or plug (fig. 9)
3 Air leaks in the joints or cracks in the suction line
Check that couplings and clamps are tight and inspect the suction line
4 Delivery line under pressure
bleed the delivery line
5 Low rotation speed of the pump
increase the speed only after having verified the contract data and the pump performance curve
6 The impeller is worn or broken
check the state of the impeller through the impeller inspection cover (26) (fig. 10), or remove the pump casing as described in
paragraph 14.2
7 The cutwater (leading edge of the volute) is worn
remove the casing as described in paragraph 14.2. Build up the cutwater with weld and shape it to restore the original profile. If the cutwater
is severely damaged, replace the casing.
8 The suction strainer (if fitted) is clogged
remove the obstructions
9 The suction lift is too high
reduce the suction lift
10 Air enters through the mechanical seal
disassemble the seal and clean it (see paragraph 14.5, 14.6); if the problem persists, change the seal
fig. 23
Half coupling
Half coupling
Rubber collar
Coupling C (b-a) Torque
type mm mm N m
J4 0,25 1,1 10
J5 0,4 1,4 20
S6 0,4 1,8 40
S7 0,5 2,1 70
Coupling type Max torque kgm rpm
14 15 4800
20 25 4400
27 40 4100
40 60 3500
55 80 3300
88 110 3000
110 150 2700
145 190 2500
180 240 2200
250 300 2150
330 400 2000
fig. 24
rubber dowel
10
Coupling
type
8 S
10 S
10 SS
11 S
14 S
Max.
speed
(RPM) Cont.
duty Intermitt.
duty
4500
4000
4000
3500
2800
17
31
31
48
94
2
30
30
62
121
Max. torque dNm

11 The suction or discharge lines are obstructed or clogged
locate the obstructed or clogged area and clean
14.2 The pump does not deliver liquid
12 The pump is not primed
see the points listed under 15.1
13 The head required by the system is greater than the rated head of the pump
revise the system design or re-select the pump
14 Excessive friction losses in the suction line
revise the distribution of elbows, valves, restrictions etc.; if necessary increase the diameter of the pipework
15 The impeller is clogged by foreign objects
disassemble the casing and remove the foreign objects
16 The suction or discharge lines are obstructed or clogged
locate the obstructed or clogged area and clean
14.3 The pump does not have sufficient capacity
17 Air leaks in the suction line
check that the couplings are airtight and inspect the suction line
18 The impeller and/or wear plate are worn
they should be replaced by disassembling the pump as described in paragraphs 14.2 and 14.3
19 The diameter of the suction line is too small
replace the suction line
Check the other possible causes in paragraph 15.2
14.4 The pump does not provide enough pressure
20 The viscosity of the liquid is higher than expected
contact the manufacturers after measuring the viscosity; for centrifugal pumps this should not exceed 50 cSt
Check other possible causes: see point 5 of paragraph 15.1 and paragraph 15.2
14.5 The pump absorbs too much power
21 The rotation speed is too high
check the correct rotation speed
22 The pump operates under conditions which are different for those specified
check the operating conditions of the pump and compare them to those on the pump name plate
23 The density of the liquid is higher than specified
measure the density (or specific gravity) of the liquid and compare it to the agreed figure
24 Incorrect alignment of the unit
check that the unit is correctly aligned as described in paragraph 11
25 Friction inside the pump between the rotating and non rotating components
remove the pump casing as described in paragraph 14.2 and check if there are signs of rubbing on the surfaces
26 Foreign bodies trapped in the impeller
remove the pump casing as described in paragraph 12.2 and remove the foreign bodies
14.6 The pump vibrates and is noisy
27 The pump is operating at too low a capacity
check the settings of the valves in the system and the readings on the pressure and vacuum gauges
28 The pump or the pipework are not well fixed
check that the pipework is correctly clamped
29 The pump cavitates
see paragraph 13.1.2
Check the possible causes in paragraph 13.1.1
30 Foreign bodies trapped in the impeller
remove the pump casing as described in paragraph 14.2 and remove the foreign bodies
14.7 The pump jams
31 Mechanical breakdown
check the shaft, flexible coupling, motor or engine, pulleys and belts, gear boxes etc. for breakages
32 Foreign bodies jammed inside the pump
remove the pump casing as described in paragraph 14.2 and remove the foreign bodies
14.8 The bearings have a short lifetime
33 Lack of lubrication
lubricate the bearings as described in paragraph 14.8
34 Foreign bodies in the bearings
change the bearings as described in paragraph 14.9
35 The bearings are rusted
change the bearings as described in paragraph 14.9
14.9 The mechanical seal leaks
36 TW type seal
this type of seal is suitable for pumping dirty liquids or liquids containing abrasive particles or petroleum products at temperatures up to
110°C; grease every 500 hours through the grease nipple until grease comes out behind the seal. If well lubricated, this seal can run dry
for 2 minutes. If the seal leaks during operation, it must be replaced (see paragraph 14.5)
37 T type seal
this seal does not require maintenance. If it leaks, replace it (see paragraph 14.5)
11

38 Flushed seal
before starting up the pump, connect the flushing hole in the seal area to the flushing liquid line with a pressure of at least 2 bar. Ensure
before starting the pump and during operation that there is a constant flow of flushing liquid in the seal. Flushing ensures that the liquid
will be diluted in the seal area to allow the seal to operate under the best possible conditions. When the pump is stopped, and will not be
restarted again for some days, empty the pump as described in paragraph 6 and wash it completely through the upper priming cover
(fig.9)
14.10 The seal overheats
The pump does not prime (see paragraphs 15.1 and 15.9)
14.11 The elastomer portions of the flexible coupling wear out quickly
Check that the pump is correctly aligned as described in paragraph 11
15 RESIDUAL RISKS
Residual risks are those which cannot be eliminated through the pump design:
-knocks
-anomalous pressure rises
-misuse
-manoeuvring errors in the vicinity of the pump
16 REPAIRS
Before carrying out repairs on the pump it is essential to:
-turn off the mains power (follow the directions in paragraph 14)
-close the gate valves on the suction and discharge sides of the pump
-if the pumped liquid is hot, wait until the pump has cooled down to ambient temperature
- if the pumped liquid is hazardous, follow the safety procedures for handling hazardous liquids
-empty the pump casing as described in paragraph 8
-remove and clean any residues of the pumped liquid
17 DISASSEMBLY
17.1 Removing the pump from the system
Carry out the instructions in paragraph 17
-remove the nuts of the suction and discharge flanges
-remove the bolts which fix the pump to the base plate
-slip the pump out of the flexible coupling (if fitted) or remove it from the electric motor
-before lifting the pump with appropriate lifting devices, check the weight of the pump
18 ASSEMBLY
18.1 Mounting the pump in the system
-lift the pump using suitable lifting devices
-position the pump on the base plate
-reconnect to the flexible coupling or electric motor
-check the alignment as described in paragraph 11
-fix the pump to the base plate
-connect the pump to the pipework
-remount any coupling guards fitted
19 SPARE PARTS
To ensure that the pump continues to operate well as time goes on, it is advisable, when ordering the pump, to acquire the spare parts
recommended for the first maintenance operation:
mechanical seal
impeller
wear plate
set of gaskets
check valve
self-locking impeller nut
19.1 Ordering spare parts
To order spare parts, specify the following:
-type of pump
-serial number of the pump
-reference number and description of the part as shown in the exploded drawing
20 DISPOSAL
-Do not abandon in the environment
-Metal parts can be recycled as scrap
-Grease and oil must be recovered and stored as prescribed by the relevant legislation for disposal by approved agencies
-Elastomer gaskets must be removed and disposed of in an approved waste disposal unit.
12

VARISCO POMPE S.r.l.
Zona Industriale Nord - Terza Strada, 9 - 35129 PADOVA - Italy
Tel.[phone] - Fax [phone] - e-mail: expor[email protected]
Web site: www.variscopompe.com
Edition 04 Rev. 00