DAYLIFE DMS Horizontal Multistage Centrifugal Pumps Instruction Manual

DMS Horizontal Multistage Centrifugal Pumps
Instruction Manual © Davis & Shirtliff Ltd 2021
Contents herein are not warranted

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 efficient and trouble-free service.
A careful reading of this Installation Manual is therefore important, though should there be any queries they should be referred to the equipment supplier.

PUMP SPECIFICATIONS

PUMP
The DAYLIFF DMS range of horizontal multistage centrifugal pumps is 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 pumps 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 a 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 fibers
Max. Fluid Temperature: +110 C
Max. Suction Pressure: 10 Bar
Max. Delivery Pressure: 30 Bar
Rotation: Clockwise viewed from the driving end

STANDARD DIMENSIONS

Pump
Size| Dimensions (mm)| Shaft| Inlet Flange| Outlet Flange
---|---|---|---|---
Inlet| Outlet| L1| IA| L5| E| H1| H| d| u| g| D| A| 0| Holes| D| A| 0| Holes
DMS 12| 50| 40| 210| 265| 62| 170| 150| 170| 25| 8| 21| 50| 140| 110| 4X13.5| 40| 150| 110| 4X17.5
DMS 25| 65| 65| 295| 330| 80| 210| 170| 210| 30| 8| 26| 65| 160| 130| 4X17.5| 65| 185| 145| 8X17.5
DMS 46| 80| 65| 295| 330| 80| 210| 170| 210| 30| 8| 26| 80| 190| 150| 4X17.5| 65| 185| 145| 8X17.5
DMS 85| 100| 100| 345| 326| 86| 250| 210| 250| 35| 10| 30| 100| 210| 170| 4X17.5| 100| 235| 180| 8X22

STANDARD DIMENSIONS

Power
(kW)| L2| L3| WeightPower (kg)| (kW)| L2| L3| WeightPower (kg)| (kW)| L2| L3| WeightPower (kg)| (kW)| L2| L3| Weight
(kg)
3| –| | –| –| –| –| | | | –| –| | 55| 277| 906| 877
4| –| –| –| –| –| –| –| | –| –| –| –| 75| 351| 980| 1040
5| 11| 210| 795| 292| 22| 360| 975| 452| 37| 360| 975| 560| 90| 425| 1054| 1061
6| 15| 210| 845| 316| 30| | 425104C| 572| 37| 425| 40| 576| –| –| –| –
7| 15| 210| 895| 333| 30| | 490110E| 592| 45| 490| 105| 664| –| –| –| –
8| 19.| 210| 945| 370| –| | 555117C| –| –| –| –| –| –| | | –

MOUNTING

Prime Mover Selection: It is essential to ensure correct prime mover selection as the pump unit will be inefficient if oversized 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 directly 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 jackshaft 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.

INSTALLATION

Location: The pump should be installed as near as possible to the water and as a general rule the suction lift should be minimized 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, and 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, vapor pressure for water 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 pipeline maintain a uniform gradient rising towards the pump for the whole distance. Avoid air pockets, humps, or depressions in the pipeline (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 efficient pump operation. Most pump operating problems are due to inappropriate suction arrangements.
Foot Valve: Unless there is a positive suction with the water surface above the pump centerline and free water flow into the pump, a foot valve is required with an inlet area at least 1 ½ times the area of the suction pipe. A strainer should have a 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 the 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 a water hammer is likely

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.

• Close discharge gate valve.
• Eliminate all air from the pump and suction pipe by priming through the priming tee.
• Air trapped in the casing and impeller can be removed by rotation of the pump shaft during filling. In positive suction installations unscrewing the vent, plug facilitates priming.
• Start the pump and check for correct rotation (clockwise viewed from the driving end).
• Slowly open the discharge gate valve.
• Check the gland packing is dripping correctly (see above)
• Check 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.

TROUBLESHOOTING

TERMS OF WARRANTY

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 the 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.

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 office 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 a standard charge out rate. Also, proof of purchase including the purchase invoice must be provided for the warranty claim to be considered.

DAYLIFF is a brand of Davis & Shirtliff for inquiries contact
Davis & Shirtliff, Ltd.
P.O. Box 41762 – 00100, Nairobi, Kenya
Tel: 6968000/ 0711 079 000
or visit  www.dayliff.com
for details of the nearest branch or stockist

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