Grundfos CRN 16 B Operating instructions

22.10.2002 GB Page 1 of 12
Service instructions
CRN 16 model B
CRT 16 model A
50/60 Hz
3~
Table of contents
1. Type identification........................................................................................................................... 2
1.1 Nameplate CR, CRN, CRT................................................................................................................ 2
1.2 Type key............................................................................................................................................ 3
1.3 Codes used........................................................................................................................................ 3
2. Torques and lubricants................................................................................................................... 4
3. Service tools .................................................................................................................................... 5
3.1 Special tools ...................................................................................................................................... 5
3.2 Standard tools.................................................................................................................................... 5
3.3 Torque tools....................................................................................................................................... 5
4. Shaft seals........................................................................................................................................ 6
5. Dismantling and assembly ............................................................................................................. 7
5.1 Dismantling........................................................................................................................................ 7
5.2 Assembly........................................................................................................................................... 8
6. Order of assembly for chambers and impellers ......................................................................... 11
6.1 CRN 16............................................................................................................................................ 11
6.2 CRT 16 ............................................................................................................................................ 12

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1. Type identification
This section shows the type key, the nameplate and the codes that can appear in the variant code.
Note: As codes can be combined, a code position may contain more than one code (letter).
1.1 Nameplate CR, CRN, CRT
TM00 3164 4800
Pos. Description Pos. Description
1Type designation 6Maximum pressure and temperature
2Model 7Rated flow rate
3Product number 8Head at rated flow rate
4Place of production 9Speed
5Production year and week 10 Country of production
CRN8-140 A-P-G-AUUE
B 42630014 P1 00 47
123
45
7
8
9
23/120-25/85
119,4
9,5 2900
10
MADE IN DENMARK
6
988348

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1.2 Type key
1.3 Codes used
Example CRN 16 - 30 /2 X- X- X- XXXX
Type range
Rated flow rate in m³/h
Number of stages x 10
Number of impellers (is only used if the pump has fewer
impellers than chambers)
Code for pump version a)
Code for pipe connection b)
Code for materials (excluding plastic and rubber parts) c)
Code for shaft seal d)
Note Code Description
a
A Basic version
S Pump without staybolts
T Oversize motor, two flange sizes bigger
UNEMAversion
b
C Clamp coupling
F DIN flange
G ANSI flange
J JIS flange
OUnion
P PJE coupling
cG Stainless steel parts in DIN W.-Nr. 1.4401
T Stainless steel parts replaced by titanium parts
d
BUBE/V Rubber bellows seal; rotating face: tungsten carbide; stationary seat:synthetic resin-impregnated carbon; O-rings: E=EPDM,
V=FKM
AUUE/V O-ring seal; rotating face: tungsten carbide; stationary seat: tung-
sten carbide; O-rings: E=EPDM, V=FKM

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2. Torques and lubricants
This section shows the screws and nuts that must be tightened to a certain torque and the lubricants to be
used.
Thread-Eze, part no. SV9997 (0,5 l).
Bonderlube, part no. SV9995 (1 l).
Silicone oil, part no. SV0862 (1 l.)
Pos. Description Dim. Torque [Nm] Lubricant
9 Hexagon socket head screw M8 x 25 31 Thread-eze
M10 x 25 62
28 Hexagon head screw
M8 x 25 12
Thread-ezeM12 x 45 30
M12 x 30 30
28.a Hexagon head screw M12 x 30 30 Thread-eze
M16 x 45 40
36 Nut M16 100 Thread-eze
36.a Nut M16 80 Thread-eze
67 Nut M12 40 Bonderlube
103 Seal ring, stationary Silicone oil
104 Seal ring, rotating
127 Hexagon socket head screw M16 100 Thread-eze
134

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3. Service tools
The following drawings and tables show special, standard and torque tools for pump service.
3.1 Special tools
3.2 Standard tools
3.3 Torque tools
TM00 2462 1193
Pos. Description For pos. Suppl. information Part no.
A Shaft holder for dismantling SV0287
B Punch for removing the shaft 51 SV0286
C Shaft holder for assembly SV0040
D Puller for neck ring 45 SV0239
EPunch for removing the pump
head cover 77 SV0252
Pos. Description For pos. Suppl. information Part no.
F Ring/open-end spanner 28.a M8 - 13 mm SV0055 28-28.a-67 M12 - 19 mm SV0054
18-28-36-36.a 24 mm SV0122
G Tee key 9 M8 - 6 mm SV0050
M10 - 8 mm SV0051
H Hexagon socket head screw key 127-134 M16 - 14 mm SV0393
Pos. Description For pos. Suppl. information Part no.
I Torque wrench H-I-J 4-20 Nm 9 x 12 SV0292 20-100 Nm 9 x 12 SV0269
40-200 Nm 14 x 18 SV0400
J Ring spanner 28.a-I M8 - 13 mm 9 x 12 SV0294 28-28.a-67-I M12 - 19 mm 9 x 12 SV0271
28-36-36.a-I M16 - 24 mm 14 x 18 SV0524
KSocket driver for hexagon socket
head screws 9-I-L M8 - 6 mm ½” x ½” SV0297
M10 - 8 mm ½” x ½” SV0298
127-134 M16 - 14 mm ½” x ½” SV0394
L Ratchet insert tool I-K 9 x 12 -> ½” x ½” SV0295
M Extension bar L-137-134 ½” x ½” x 10 SV0395

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4. Shaft seals
TM00 2430 3596
Stationary shaft seal part Rotating shaft seal part
TM00 2429 4493

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5. Dismantling and assembly
The GRUNDFOS centrifugal pumps, types CRN 16/CRT 16, are multistage in-line pumps.
If it is necessary to dismantle the pump, either because it is choked or damaged, please follow the instruc-
tions below.
Position numbers, see “Parts list” and section 3. Service tools.
5.1 Dismantling
Slacken the screws pos. 7a and remove them together with the coupling guards pos. 7. Remove the hexa-
gon socket head screws, pos. 9, the coupling, pos. 8, and the shaft pin, pos. 10.
Slacken and remove the hexagon head screws, pos. 28. The motor is now free and can be lifted off.
Remove the nuts, pos. 36, and the washers, pos. 66a.
CRN 16 S: Remove the nuts, pos. 128, the hexagon socket head screws, pos. 127, and the washers, pos.
129.
Loosen the pump head, pos. 2, with a light blow on the edge. Remove the pump head (with with pump head
cover, pos. 77, stationary shaft seal part and disc spring, pos. 60).
Pull the rotating shaft seal part off the shaft, see section 4. Shaft seals.
The seal ring must not be exposed to blows or knocks.
CRN 16 S: Remove the hexagon socket head screws, pos. 134, and the washers, pos. 135.
Remove the outer sleeve, pos. 55, and the top chamber, pos. 3.
Loosen the chamber stack with a light blow of a rubber mallet and lift it out of the inlet part, pos. 44.
CRT 16: Remove the split pin, pos. 67.a.
Hold the shaft by means of a screwdriver inserted in the shaft pin hole while the nut, pos. 67, is slackened.
Remove the nut, the washer, pos. 66 (not included in CRT), and the spacing pipe, pos. 64c.
Place the shaft holder, pos. A, in a vice and tighten it. Place the chamber stack in the shaft holder with the
threaded shaft end pointing upwards.
Make sure that the chamber is positioned in the recess of the shaft holder, pos. A, and that the shaft can
pass freely through and underneath the shaft holder.
Screw the punch for dismantling, pos. B, home on the threaded shaft end.
The first chamber to be removed is always a chamber with bearing ring, pos. 4a. See also section 6. Order
of assembly for chambers and impellers.
Drive the punch down through the impeller hub by means of a hammer. Remove the free parts from the
shaft: Impeller, spacing pipe, chamber, bearing ring and spacing pipe. Repeat the procedure until the shaft
passes through the shaft holder, pos. A.
Take care not to damage the shaft when it is driven free of the last impeller and the spacer for shaft seal,
pos. 61.
Remove the punch, pos. B, from the threaded shaft end.
If the stop ring, pos. 62, is damaged, push it out of the recess and pull it free of the spline (towards the
threaded shaft end).
Pump head
Press the stationary shaft seal part out of the pump head by means of a nylon punch or a similar tool, see
section 4. Shaft seals, and remove the gasket, pos. 37.
The stationary seal ring must not be exposed to blows or knocks.
Remove the air vent screw, pos. 18, (right-hand thread) with O-ring, pos. 100.
Loosen the pump head cover complete, pos. 77, from the pump head by knocking the socket, in which the
air vent screw was fitted, downwards by means of a rubber mallet.

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Drive the cover out of the pump head by means of the punch, pos. E, which is inserted in the socket. Re-
move the pump head cover.
Impeller
The impeller (wear ring, pos. 49c) must fit into the neck ring, pos. 45. If the tolerance (clearance) between
neck ring and impeller (wear ring) is too big, replace the worn part.
The wear ring, pos. 49c, can be loosened from the impeller with light blows. Remove the ring.
Take care not to damage the impeller.
Neck ring
Free the neck ring, pos. 45, by pushing up the neck ring retainer, pos. 65, with the puller, pos. D.
Base
Push the inlet part, pos. 44, and the guide plate, pos. 6d, free of the base, pos. 6, using two screwdrivers.
Remove the gasket, pos. 37, from the base.
Outer sleeve
CRN 16 S: Remove the retaining rings, pos. 126 and 133, and the clamping plates, pos. 125 and 132.
5.2 Assembly
Before assembly, clean and check all parts.
Parts which are defective or do not comply with the measurements mentioned below due to wear should be
replaced by new parts.
Nut for shaft, gaskets and O-rings should always be replaced when the pump is overhauled.
Bearing
The maximum permissible difference between the diameters of the rotating bearing ring, pos. 47a, and the
stationary bearing ring in the chamber, pos. 4a, is 0.4 mm.
Pump head
Moisten the O-rings, pos. 78 and 98, with water and fit them to the collar and the socket of the pump head
cover, pos. 77.
Push the pump head cover into the pump head.
Make sure that the pump head cover is pressed home in the pump head.
Fit the O-ring, pos. 100, to the air vent screw, pos. 18, and fit the screw (right-hand thread) into the socket
of the pump head cover.
Moisten the recess of the pump head cover and the stationary shaft seal part with water.
Press the stationary shaft seal part into the recess of the pump head using fingers only, see section 4. Shaft
seals.
The stationary seal ring must not be exposed to blows or knocks.
Moisten the gasket, pos. 37, with water and place it in the recess of the pump head.
Impeller
Press the wear ring, pos. 49c, carefully down over the impeller skirt.
Make sure to push the ring straight down and home against the impeller skirt and take care not to damage
the impeller.
Neck ring
Place the neck ring, pos. 45, on the chamber/inlet part. Then place the neck ring retainer, pos. 65, on the
neck ring and press it until it engages with the chamber/inlet part.
It must be possible to move the neck ring freely (sideways) between the retainer and the chamber/inlet part.
Note: No neck ring is fitted in the chamber, pos. 3a.

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Base
Fit the guide plate, pos. 6d, the gasket, pos. 37, and the inlet part, pos. 44, in the base. Make sure that the
projection on the upper side of the guide plate engages with the inlet part.
Outer sleeve
CRN 16 S: Fit the clamping plates, pos. 125 and 132, to the outer sleeve. The chamfer must point towards
the retaining ring. Fit the retaining rings, pos. 126 and 133, into the recesses of the outer sleeve.
Place the shaft holder, pos. C, in the vice. Place the shaft, pos. 51, in the shaft holder and tighten the vice.
The threaded shaft end must be uppermost and the opposite end must be flush with the lower edge of the
shaft holder.
Fit the stop ring, pos. 62, in the recess of the shaft.
Fit the spacer for shaft seal, pos. 61, to the shaft with the driving dogs pointing towards the vice.
Continue the assembly up to the nut, pos. 67, see section 6. Order of assembly for chambers and impellers.
CRT 16: The nut pos. 67 is locked by a split pin pos. 67.a instead of a washer pos. 66.
Lubricate the nut, pos. 67, with BONDERLUBE. Fit the nut and tighten to the torque stated in section 2.
Torques and lubricants .
Slacken the vice and lift the chamber stack off the shaft holder.
Fit the chamber stack with the smooth shaft end pointing upwards and press it down so that it engages with
the inlet part in the base.
Fit the outer sleeve, pos. 55, to the base. Do not forget the gasket, pos. 37.
CRN 16 S: Lubricate and fit the hexagon socket head screws, pos. 134, and the washers, pos. 135. Tighten
the screws diagonally to the torque stated in section 2. Torques and lubricants.
Fit the rotating shaft seal part, see section 4. Shaft seals.
Moisten the rubber parts with water before they are fitted.
Make sure that the rubber parts are not damaged on the shaft pin hole and that the seal rings are not ex-
posed to blows or knocks.
Check that the spacer for shaft seals (pos. 61) engage when the spring is compressed. The spring will then
press the seal ring upwards to a neutral spring position.
Fit the top chamber, pos. 3, and the disc spring, pos. 60.
Before fitting the pump head, pos. 2, check that the gasket, pos. 37, and the stationary shaft seal part are
positioned correctly.
In the case of shaft seals with stationary and rotating seal rings of tungsten carbide, lubricate the seal faces
with silicone oil. Part number, see section 2. Torques and lubricants.
Lubricate the seal faces only.
Fit the pump head to the chamber stack with the air vent screw, pos. 18, in the required position.
CRN 16 S: Lubricate and fit the hexagon socket head screws, pos. 127, the washers, pos. 129, and the
nuts, pos. 128. Tighten the nuts diagonally to the torque stated in section 2. Torques and lubricants.
Lubricate the threads of the staybolts. Replace the washers, pos. 66a, and the nuts, pos. 36, and tighten
diagonally to the torque stated in section 2. Torques and lubricants.
Fit the motor and turn it to the required terminal box position. Lubricate the screws, pos. 28. Fit the screws
and tighten diagonally to the correct torque.
Fit the shaft pin pos. 10 in the shaft pin hole. Fit the coupling, pos. 8. Lubricate the hexagon socket head
screws, pos. 9. Fit the hexagon socket head screws, tighten and leave loose.
Check that the gaps either side of the coupling halves are equal and that the chamber stack is in its bottom
position.
Raise the chamber stack 1-2 mm from its bottom position by means of a large screwdriver or a similar tool
inserted underneath the coupling.

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Tighten the hexagon socket head screws two and two (one side at a time), see section 2. Torques and lub-
ricants.
Checkthatthe gaps either sideofthe coupling halves areequalandcheckthe pump byturningthecoupling.
If the pump is tight or it cannot be rotated, a further adjustment should be carried out.
Fit the two coupling guards pos. 7 and fasten them with the screws pos. 7a.
The pump is now assembled. Check the head and flow and compare the results with the test specification
no. BM33A001.

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6. Order of assembly for chambers and impellers
1. Determine pumptype (CRN 16 or CRT 16) and stage variant. Find the pump in the relevant stage sur-
vey table.
2. Find the components of each stage in the symbol survey
6.1 CRN 16
Stage survey
TM00 2354 3596TM00 2356 4093
Symbol survey

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47a
64d
64a
4a
49
64
4
49
49
3a
69
3b
69a
30 50/4 50 140/12 16030/2 140
100/87070/6
CRT 16 -
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
100
6.2 CRT 16
Stage survey
TM02 4717 1502
Symbol survey
* * * *
Note:
*indicates that ...
• the type designation for the pump has
been changed
• the pump has one or two extra empty
chambers
• shaft, outer sleeve and staybolts are
correspondingly longer.