DAYLIFF DB Istruzioni per l'installazione

DB & DBH

Horizontal Multistage Pumps

Installation &

Operating Manual

DB2 DB4

DB8 DB12

DBH

PUMP SPECIFICATIONS

INSTALLATION 2

ELECTRICAL CONNECTIONS

PRIMING

MAINTENANCE

INDEX

Contents herein are not warranted

TROUBLE SHOOTING

WARRANTY

1. PUMP SPECIFICATIONS

FLOW RATE (m /hr)

DB 4/60

DB 4/40

DB 4/30

12 3 456780

HEAD (m)

2468 12

FLOW RATE (m /hr)

DBH

EFFICIENCY % PUMP HEAD (m)

100

DBH8-30

DBH4-50

DBH2-40

DBH8-30

DBH4-50

DBH2-40

DB 2/50

DB 2/30

0.5 1.0 1.5 2.0 2.5 3.0 3.50

HEAD (m)

DB 8-50

DB 8-30

12 3 45678 9 10

HEAD (m)

2 4 6 8 10 12 14

DB 12-50

DB 12-30

DB2/DB4/DB8/DB12

FLOW RATE (m /hr)

FLOW RATE (m /hr) 3

FLOW RATE (m /hr)

Congratulations on selecting a Dayliff DB/DBH 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.

PUMP

The Dayliff DB/DBH range of horizontal multistage centrifugal pumps are

designed for continuous duty in various water transfer duties with particular

application in pumping slightly corrosive liquids. The pump has small

physical dimensions, axial suction port and radial discharge and is base

plate mounted. DB suction chamber and pump head are made of grey cast

iron while the impeller and impeller housing are of stainless steel. DBH pump

body, suction and discharge ports are made from AISI 316 stainless steel as

is all the other parts in contact with the pumped liquid. The mechanical seal is

made from silicon carbide designed for easy replacement. Both pump and

continuously rated motor unit are of monoblock design and particular

attention has been paid to quietness and smooth operation.

MOTOR

The pump is coupled to a totally enclosed, fan cooled single phase squirrel-

cage motor with built in thermal overload protection suitable for continuous

duty. The motor can be connected to a power outlet fuse or MCB and

protection must be provided.

Enclosure Class:DB2/4 & DBH - IP54, DB 8/12 - IP44

Insulation Class: F

Voltage:1x220-240V, 3x380-415 (DB8-50, DB12-50)

Speed:2900rpm

OPERATING CONDITIONS

Pumped Liquid: DB - Thin, clean, non-aggressive and non-explosive

liquids solid particles.

DBH - Thin, clean, slightly aggressive but non-explosive liquid without solid

particles or fibres.

0 0

Liquid Temperature: 0 C - 110 C

Max. Ambient Temperature: +40 C

Max. Suction Lift: According to NPSH curve plus a safety margin of 1

Max. Operating Pressure: 10 Bar up to 40 C

6 Bar up to 90 C

0.37 4 1" 132 255 403 10

6 1¼” 204 441 12

12 1½” 178 267 514 22

DBH 2-40

0.75

1.5

DBH 4-50

DBH 8-30

DB Cross Sectional Diagram

142

140

480

680

820

1020

1450

1710

1080

2700

1500

PUMP DATA

Model Current

(A)

Dimensions(mm) Weight

(kg)

DNA C H L1

Power

(W) DNB A

DB 2-30 2.3 12

DB 2-50 3.2 11

3.5

DB 4-30 12

4.3DB 4-40 13

DB 4-60 6.2 15

DB 8-30

3.4

5.1

DB 8-50

DB 12-30

4.8

6.8

DB 12-50

2) INSTALLATION

! Site in a dry, well ventilated and weather

proof location with an ambient

temperature of no more than 40 C.

! Locate on a solid flat surface ensuring the

shaft is in a horizontal position.

! Ensure that the diameter of the suction

pipe is at least the size of the pump

suction inlet. If the suction depth exceeds

4 meters then a one size larger diameter pipe. If the suction depth

exceeds 4 meters then a one size larger diameter pipe should be used,

though for maximum pump performance suction height should be

minimised.

Foot Valve

UPWARD SLOPE

TO SUCTION

Max 6m

Min 50cm

1¼”

1½”

1¼”

119

155

137

164

218

138

108

138

108

130

141

181

228

248

327

363

344

372

465

420

390

450

390

DNB

DNA

DBH Cross Sectional Diagram

DNB

DNA

BL1

3) ELECTRICAL CONNECTIONS3) ELECTRICAL CONNECTIONS

The installer is responsible for making electrical connections

to the mains supply in compliance with relevant local

regulations. Ensure that a professional electrician carries out

the electrical connections and that the following guidelines

are followed:-

ŸAll installations must be provided with an isolator to cut off mains power

supply and coarse current protection in the form of a fuse or MCB rated

at 2-3 times the full load current as given on the pump plate.

ŸEnsure that the power supply rating complies with the specification on

the pump rating plate.

ŸElectrical connections must be made according to details in the pump

junction box cover and effective earthing must be provided according to

local regulations.

ŸSingle-phase motors are protected against overloads by a thermal

overload fitted in the motor windings. Three phase motors should be

installed with remote starter.

WARNING

! If there is negative suction (i.e the pump is above the suction water level)

the suction pipe must be slightly angled upwards towards the pump inlet

to avoid the formation of air locks. It must also be immersed in water by

at least 0.5m to avoid the formation of vortexes and a good quality foot

valve must be fitted.

! Ensure that all suction pipe connection are completely airtight or else the

pump will not operate.

! The diameter of the delivery pipe must be chosen to suit the flow rate and

pressure required at the delivery point though must not be smaller than

the pump outlet size. It is also advisable to fit a non-return valve and

isolating valve on the delivery outlet.

! This measure is essential if the delivery pressure exceeds 20 meters.

! The pipes must be fitted using suitable brackets to avoid transmitting

stress to the pump body. Take care not to cause damage by over

tightening the pipes during fitting.

5. MAINTENANCE

WARNING

Pumps do not require routine maintenance provided the following

precautions are taken:-

ŸCheck that the foot valve is clean and unrestricted at regular intervals.

ŸIf the pump is to remain unused for long periods of time it is advisable to

empty it completely, rinse it with clean water and store in a dry place.

ŸIf the shaft does not run freely, release it using a screwdriver by inserting it

in the special slot on the rear of the pump shaft. If this is not sufficient to

solve the problem remove the pump body by unscrewing the relevant

mounting bolts and clean it thoroughly to remove any encrustation.

Never carry out any work on the pump without having first

disconnected from the mains supply.

Serious damage will occur if a pump is not properly primed

and runs without water.

4) PRIMING

WARNING

The pump must be primed before operation. To do this completely fill the

pump housing with clean water through the priming plug before switching it

on.

When full replace the priming plug and start the pump checking there is a

steady flow at the pump outlet. The pump should be primed whenever it has

not been used for a long period of time or when air has made its way into

the system.

6. TROUBLE SHOOTING

PROBLEM POSSIBLE CAUSE SOLUTION

Motor won’t

start

Check connections and power

supply

No Power

See section on maintenance

Impeller stuck

Motor turns

without

pumping Move pump closer to water level

Check suction pipe is airtight

Make sure foot valve is immersed

by at least 50cm

Pump needs to be primed

Clean foot valve

Excessive suction height

Air in suction

Clogged foot valve

Delivery head exceeds pump capacity Reduce delivery head

Specify different pump

Flow rate

insufficient

Reduce suction height

Clean foot valve and, if necessary

whole Intake pipe

Disassemble pump and carefully

clean pump body and impeller

Foot valve partially clogged

Impeller blocked

Suction height at limit

Tripped motor

overload

Check voltage and ventilation

Release impeller

(See section on maintenance)

Overheated motor

Impeller stuck

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 one year - The item will be replaced or repaired at no charge.

• Over one years, less than two 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.

7. TERMS OF WARRANTY

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.

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