DAYLIFF DFP Installation instructions

DFP
Sanitary Pump
Installation &
Operating Manual

SPECIFICATIONS
1.
1
2.
INSTALLATION 2
ELECTRICAL CONNECTIONS
3.
3
OPERATION
4.
4
TROUBLE SHOOTING
5.
5
INDEX
© Davis & Shirtliff Ltd 2023
Contents herein are not warranted
TERMS OF WARRANTY
6.
7

1
1. PUMP SPECIFICATIONS
Congratulations on selecting a Dayliff DFP Sanitary Pumps. 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.
3
FLOW RATE (m /hr)
PUMP HEAD (m)
PUMP
Dayliff DFP sanitary pumps are of single stage centrifugal impeller type specifically designed
to meet the hygiene requirements of sterile operating processes. They are suitable for
various applications including water supply systems, pressure boiler feeding, pure water
treating systems, pharmaceutical, food and refining chemical industries. The design
features optimised hydraulics for high efficiency and polished internal finishes to prevent
fouling by bacteria and germs. Pump hydraulic end construction is AISI 316L stainless steel
throughout with specialised mechanical seal that can handle hot pumped media.
MOTOR
Pumps are close coupled to reliable TEFC electric motors designed for continuous duty.
Single phase motors have integral thermal protection and can be connected directly to the
mains power through a 10A fuse or MCB. Three phase motors require a remote DOL starter.
Enclosure Class: F Insulation Class:IP57 Speed:2900rpm
OPERATING CONDITIONS
Pumped Liquid: Low viscosity fluids with a max. viscosity of 150mm²/s
Maximum Operating Pressure:10 bar
0
Maximum Temperature : 110 C
0
10
20
30
40
50
5 10 15 20
60
25 30 35 40 45
DFP75
DFP22

2
PUMP DATA
2. INSTALLATION
ŸPump location should be as close as possible to
the liquid level, thus avoiding excessively long
suction piping. Its position must meet the
criterum that NPSHd is higher than NPSHr of the
pump.
ŸFor the pump to run properly, the layout and
dimensional design of the suction piping should
meet the following criteria.
ŸThe suction piping should be short, with as
few bends as possible, any such bends
should have wide curve radius, the last
section before the pump being straight.
ŸThe diameter must be 1.5 to 2 times the
diameter of the pump’s suction flange.
ŸThe inlet cone must be eccentric when the
pump works under depression. If it works
under load this cone may be concentric.
ŸThe piping should be upwards towards the
pump, with a slope of atleast 2%. It must be
properly sealed, preventing the admission
of air.
1. Foot valve with
strainer
2. Elbow
3. Rising pipe.
Inclination minimum
2%
4. Eccentric cone
5. Vent plug
6. Non return valve
7. Delivery valve
8. Delivery pipe
DFP22
Motor
Model Dimensions (mm)
DFP75
kW HP W H L D1
244 292 472 165 140
300 340 535 185 150
Current
(A)
13.532.2
15107.5
Weight
(kg)
323250
674065
DNA
(”)
DNM
(”) D2
Voltage
(V)
1x240
3x415
D2
DNM
W
H
DNA
L
D1

3
3. ELECTRICAL CONNECTIONS
NOTE
The pipes should be held on supports close to the body of
the pump so that they do not transmit any stresses on the
pump anges.
The figures below show the proper connection for the case of direct starting and three
phase line with 200V and 380V mains voltage.
WARNING
Electrical connection should be done by qualied personnel.
When the pump, is installed in negative suction, it should have a suitable foot valve
placed at required depth to prevent air intake.
The delivery piping must;
ŸBe properly sealed
ŸHave proper dimensions to avoid excessive head losses
ŸHave a delivery valve at the outlet of the pump
ŸWhere necessary, a non return valve should be installed between the pump
and the delivery valve as well as other appropriate accessories to eliminate
harmful effects of water hammer.
WARNING
Before making the motor connections, check that the power
supply is switched off.
WARNING
Ensure that the pump is properly grounded before operation

4
Starting: Remove the bridge plates from the terminal box and connect the motor
terminals to the corresponding ones on the starter.
Supply Voltage
NOTE
Check that the values for the voltage and frequency of the
supply mains coincide with the ones indicated on the motor
nameplate, depending on star or delta connection.
4. OPERATION
Pump should not be used for any purpose other than the one it was designed for.
STARTING
Before starting, the following points should be taken into account;
ŸCheck the proper priming of the pump and pipelines, as the fluid should overflow
the system to ensure that all the air has been vented.
ŸMake sure that the direction of rotation coincides with the direction of the arrow
located on the pump body.
ŸCentrifugal pumps performance is simple and safe and does not require any
exhaustive checking to guarantee proper operation.
ŸOperation should be silent and vibration free. Check that the flow and service
pressure match with demand/requirement.
ŸCheck that the input current (consumption in amperes) is not over the values stated
in the motor nameplate.
ŸWhen the equipment is to be left idle for long periods, the pump and piping should
be completely drained to prevent possible rusting of the mechanical parts that
might be caused through trapped liquid.

5
5. TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Rotating the wrong way
Low rotating speed
The pump
does not
pump
Change connections of electric
motor
Pump not primed Foot valve leaking. Leaks in gaskets
or suction piping. Check and repair
Check the reason for this low speed
(excessive consumption or low
frequency)
Suction head too high
Take the pump closer to the water
level. Change the pump for another
with less NPHSr. Reduce leaks in the
suction piping
Air getting into suction pipe
Test pressure the suction pipeline
including the pump and observe any
liquid leak
Insufficient liquid intake E x t e n d t h e s u c t io n p i p elin e
increasing the submergence
Foot valve partially blocked
Insufficient
flow
Clean footvalve
Insufficient liquid intake Submerge the foot valve more/
Reduce the flow
Air pockets in suction line Change the arrangement of the
pipeline.
Direction changed Change connections of electric
motor
Internal parts worn Replace the worn parts

6
PROBLEM POSSIBLE CAUSE SOLUTION
The power
consumption
is higher than
expected
Reduce the flow with the delivery
valve or change the motor
Specific gravity and viscosity above
design
Check the fastening of the terminals.
Check the mains voltage and make
sure the shaft turns gently by hand
Excessive consumption
Test pressure the suction pipeline
including the pump and observe any
liquid leak
Air trapped in the suction line
The pump
vibrates
Change the impeller, clean the
impeller
Impeller imbalanced through
breakage or partial obstruction
Change the operating conditions or
the pump in the installation.
Cavitation
Eliminate the tension by loosening
the pipeline
Tension in the pipeline
Bleed the air from the liquid or
prevent it from getting into the pump
Air in the liquid
The bearing
gets too hot

6. TERMS OF WARRANTY
i) General Liability
ii) Standard Warranty
7
• In lieu of any warranty, condition or liability implied by law, the liability of
Dayliff (hereafter called the Distributor) in respect of any defect or failure
of equipment supplied is limited to making good by replacement or
repair (at the Distributor 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 Distributor 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 Distributors reasonable control. Also, any repair
or attempt at repair carried out by any other party invalidates all
warranties.
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
a warranty claim to be considered

INS528A-03/23