DAYLIFF DMS Installation instructions

DMS
Installation &
Operating Manual
Horizontal Multistage Centrifugal Pumps

1
3
4
5
6
7
PUMP SPECIFICATIONS
1.
2.
MOUNTING
INSTALLATION
3.
PUMP OPERATION
4.
TROUBLE SHOOTING
5.
INDEX
© Davis & Shirtliff Ltd 2021
Contents herein are not warranted
WARRANTY
6.

PUMP
The DAYLIFF DMS range of horizontal multistage centrifugal pumps are heavy duty
industrial quality pumps suitable for various water supply, irrigation and industrial
applications. Particular features include gland packing seals for simple and
economical maintenance and external securing tie bolts for ease of disassembly.
Construction is heavy duty cast iron stages and pump body, with cast iron impellers
and diffusers and stainless steel shaft.
A wide range of models and specifications are available, a combination of the pump
size and number of stages being selected to achieve maximum efficiency at a specific
duty point. Electric motors are selected according to the required power input at the
duty point and mounted together with the pump and coupling on a base frame. All
pumps are also suitable for direct or belt drive by diesel engine.
OPERATING CONDITIONS
Pumped liquid: Thin, clean, chemically non-aggressive liquids without abrasive
particles or fibres
0
Max. Fluid Temperature: +110 C
Max. Suction Pressure: 10 Bar
1
1. PUMP SPECIFICATIONS
Congratulations on selecting a Dayliff DMS Pump. They are
manufactured to the highest standards and if installed and operated
correctly will give many years of efcient and trouble free service.
Careful reading of this Installation Manual is therefore important,
though should there be any queries they should be referred to the
equipment supplier.
50
100
150
200
250
300
02 4 6 8 10 20 40 60 10080
3
FLOW RATE (m /hr)
PUMP HEAD (m)
12/8
12/7
12/6
12/5
25/7
25/6
25/5
46/7
46/6
46/5
85/5
85/4
85/3

2
STANDARD DIMENSIONS
Dimensions (mm) Inlet Flange
Pump
Size
DMS 12
DMS 25
DMS 46
DMS 85
Inlet
50
65
80
100
Outlet
40
65
65
100
O
STANDARD DIMENSIONS
* Power absorbed at 2900rpm
Stages DMS 12
3
4
5
6
7
8
DMS 25 DMS 46 DMS 85
Power*
(Kw)
-
-
11
15
15
18.5
-
-
292
316
333
370
Weight
(kg)
--
--
210 795
210 845
210 895
210 945
L2 L3 Power*
(Kw)
-
-
22
30
30
-
-
-
452
572
592
-
Weight
(kg)
-
-
360
425
490
555
L2
-
-
975
1040
1105
1170
L3 Power*
(Kw)
-
-
37
37
45
-
-
-
560
576
664
-
Weight
(kg)
-
-
360
425
490
-
L2
-
-
975
1040
1105
-
L3
877
1040
1061
-
-
-
Power*
(Kw)
55
75
90
-
-
-
Weight
(kg)
277
351
425
-
-
-
L2
906
980
1054
-
-
-
L3
AD
Shaft
L1
210
295
295
345
L4
265
330
330
326
L5
62
80
80
86
E
170
210
210
250
H
170
210
210
250
H1
150
170
170
210
d
25
30
30
35
u
8
8
8
10
g
21
26
26
30
Holes
L1
Inlet
E
u
d
Inlet Outlet
H1
L4
L3
L5
H
L2
Flange
DOA
g
4X13.5 4X17.5
Outlet Flange
O
AD Holes
4X17.5 8X17.5
4X17.5 8X17.5
4X17.5 8X22
50 140 110 40 150 110
65 160 130 65 185 145
80 190 150 65 185 145
100 210 170 100 235 180
Max. Delivery Pressure: 30 Bar
Rotation: Clockwise viewed from driving end

3
DIRECT COUPLED UNITS
A
D
o
CHECK FOR AXIAL ALIGNMENT AT 90 INTERVALS CHECK FOR AXIAL ALIGNMENT IN HORIZONTAL
AND VERTICAL PLANES P
2. MOUNTING
Prime Mover Selection: It is essential to ensure correct prime mover selection
as the pump unit will be inefficient if over sized and will overload if undersized. The
power absorbed at the duty point should be read from the pump curve and an
appropriately sized prime mover selected that allows for some spare power
capacity (recommended 15%) to accommodate efficiency reductions as the
installation ages. Care should also be taken to de-rate engines for altitude and
temperature.
Direct coupled units: Units should be direct coupled if possible. Mounting
frames should be rigid to prevent flexing during operation. The pump and prime
mover should be connected with a flexible coupling and great care must be taken
to ensure axial and horizontal alignment. Pump sets must be tested to check for
misalignment vibration before installation.
Belt Drive Units: Where the pump and prime mover (usually an engine) need
to rotate at different speeds pulley drive can be used. In these cases a jack shaft
mounted on plumber blocks is necessary to avoid radial loads on the pump shaft
and generally a similar arrangement should be used for the engine. Pulley sizes
should be selected to give the correct unit speeds and manufacturer's data should
be used to select a belt arrangement to prevent overloading. Correct alignment is
also important.
Provision should be made for prime mover movement for belt tensioning, which
should not be over tensioned as the additional loads will cause equipment
damage.

4
3. INSTALLATION
NOTE
3. INSTALLATION
Location: The pump should be installed as near as possible to the water and as a
general rule the suction lift should be minimised to ensure maximum pumping
efficiency.
Foundation: To be sufficiently substantial to
support the pump independently of piping and
provide sufficient support to eliminate
mounting bedplate distortion. For engine drive
sets the foundation should be substantial to
absorb the engine vibrations.
Pipe Supports: Piping should be supported
independently near the pump. Pipe loads on
the pump flanges must be avoided.
Suction Lift: In the case of negative suction
installations the suction lift, which should be
the sum of the vertical lift, the suction line friction losses, vapour pressure for water
0
above 30 C and a safety margin of 2m must always be less than the given NPSH
required by the pump at the rated flow. Refer to the pump curve for NPSH required.
Suction Pipe: The suction pipe must be absolutely airtight as even small leaks
will impair or stop pump operation. A pipe size larger than the pump connection is
recommended and tapered eccentric connectors should be used for changes in
pipe diameter. The suction line should be as short and direct as possible and sharp
turns should be avoided by using long radius bends and not elbows. When laying
the pipe line maintain a uniform gradient rising towards pump for the whole
distance. Avoid air pockets, humps or depressions in the pipe line (even if the
pump is below supply level) which may trap air and impair performance.
Ensure the end of the suction line is sufficiently below the water surface to prevent
(recommended 50 cms). The line must be free from pipe scale, welding beads or
any loose particles that could damage the pump when operating.
An effective suction installation is essential for efcient pump
operation. Most pump operating problems are due to inappropriate
suction arrangements.

5
4. PUMP OPERATION
Gland Packing: A gland packing must drip during normal operation to ensure
shaft lubrication. To adjust gland stud nuts should be finger tight when the pump is
first started. After start-up allow time for the packing to settle, then adjust leakage
rate by tightening the nuts one flat at a time giving time to settle with each
adjustment. The leakage rates should be about 20 drops per minute.
Lubrication: Ball bearings require no initial lubrication but should be greased
every 2000 hours of running, annually or immediately prior to operating after a
long period of idleness. Apply about two strokes from an average grease gun on
the bearing housing grease nipple, though ensure not to over grease.
Pump Starting:
On Initial start up or after maintenance.
ŸClose discharge gate valve.
ŸEliminate all air from the pump and suction pipe by priming through the
priming tee.
ŸAir trapped in the casing and impeller can be removed by rotation of pump
shaft during filling. In positive suction installations unscrewing the vent plug
facilitates priming.
ŸStart the pump and check for correct rotation (clockwise viewed from the
driving end).
ŸSlowly open discharge gate valve.
ŸCheck the gland packing is dripping correctly (see above)
ŸCheck for unusual noise or operating temperature.
Normal operation:
As for initial starting, except that the air elimination operation may not be required
if the pump is adequately primed, though discharge should always be checked for
normal flow.
Foot Valve: Unless there is a positive suction with the water surface above the
pump centerline and a free water flow into the pump, a foot valve is required with
an inlet area atleast 1 ½ times the area of the suction pipe. A strainer should have
clear area of 3 or 4 times that of the suction pipe.
Discharge Pipe: The discharge pipe should generally be at least one size larger
than the pump outlet such that friction head created is not excessive. The friction
head should be calculated to ensure that the pump is not overloaded. A gate valve
should be fitted close to the pump for maintenance purposes and for longer
pipelines where water hammer is likely

6
5. TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Low flow
Check all the possibilities described for no flow
Foot valve and suction piping too
small or too long
Wrong direction of rotation
Change piping
Change motor connections
No flow
Discharge head too high
Suction lift too great
Suction line and pump housing not
properly primed
Impeller, suction pipe or foot valve
clogged
Air leak in suction line
Packing worn allowing to leak into
pump
Check both the static and friction head
Check sufficient new positive suction
head available
See Pump Starting
Rectify condition
Rectify condition
Replace packing
New Installation
Old Installation
Change suction arrangement
Check for bent shaft, loose impeller
shaft, worn bearings, pump and
motor out of alignment
Noisy
operation
Insufficient NPSH available causing
cavitation
Mechanical damage
Motor
overload
Rectify condition
Check pump curve for power
required
Reduce flow by restricting discharge
gate valve or reduce the impeller
diameter
Mechanical friction due to impeller
fouling the pump casing, bent shaft,
pump and motor out of alignment;
gland packing too tight, low voltage
Undersized motor
Flow too great due to total head being
lower than anticipated
Most bearings are capable of withstanding a moderate temperature rise above
ambient
Check for over greased bearing
housing, misaligned coupling,
drive belts misaligned or too tight
Hot bearings
If temperature is excessive

6. TERMS OF WARRANTY
7
ii) Standard Warranty
General Terms
If equipment failure occurs in the normal course of service having been
competently installed and when operating within its specified duty limits
warranty will be provided as follows:-
• Up to two years - The item will be replaced or repaired at no
charge.
• Over two years, less than three years - The item will be replaced or
repaired at a cost to the customer of 50% of the Davis & Shirtliff
market price.
The warranty on equipment supplied or installed by others is conditional
upon the defective unit being promptly returned free to a Davis &
Shirtliff ofce and collected thereafter when repaired. No element of site
repair is included in the warranty and any site attendance costs will be
payable in full at standard chargeout rates. Also proof of purchase including
the purchase invoice must be provided for warranty claim to be considered.
i) General Liability
• In lieu of any warranty, condition or liability implied by law, the liability of
Davis & Shirtliff (hereafter called the Company) in respect of any defect
or failure of equipment supplied is limited to making good by
replacement or repair (at the Company's discretion) defects which
under proper use appear therein and arise solely from faulty design,
materials or workmanship within a specified period. This period
commences immediately after the equipment has been delivered
to the customer and at its termination all liability ceases. Also the
warranty period will be assessed on the basis of the date that the
Company is informed of the failure.
• This warranty applies solely to equipment supplied and no claim for
consequential damages, however arising, will be entertained. Also
the warranty specifically excludes defects caused by fair wear and tear,
the effects of careless handling, lack of maintenance, faulty installation,
incompetence on the part of the equipment user, Acts of God or any
other cause beyond the Company's reasonable control. Also, any repair
or attempt at repair carried out by any other party invalidates all
warranties.