Flowserve Worthington WXB User Manual download pdf (Page 17)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 17 of 51

4.5.6 Balancing line

The pump must have a balancing line back to suction

for proper axial thrust balancing. This could be

a) an internal balancing line. This is usually used for

water services up to 80°C (176°F).

b) a connection for an external balancing line. This

is usually used for hot water and hydrocarbon

service.

Refer to GA drawing for type of balancing

line.

4.5.6.1 Design guidelines for external balancing

line

The balancing line shall be led back to the suction

vessel. The line must be open during operation to

avoid damage of the equipment. The maximum back

pressure created in the balance line, shall not exceed

2 bar (29 psi) above suction pressure. Therefore the

balance line shall be designed for a pressure loss of

max. 1 bar (14.5 psi). The following table gives the

expected balance flow rates:

2 WXB 6 m³/h (26.4 gpm)

3WXB 8 m³/h (35.2 gpm)

4WXB 10 m³/h (44.4 gpm)

6WXB 11 m³/h (48.4 gpm)

These flowrates shall be used for the piping design.

Flashing of the fluid in the balancing line shall be

avoided, therefore the installation of an anti-flashing

orifice at the end of the balancing line is

recommended.

Design and manufacturing of the balance

line is not within the responsibility of FPD.

4.6 Electrical connections

Electrical connections must be made by a qualified

Electrician in accordance with the relevant local

national and international regulations.

It is important to be aware of the EUROPEAN

DIRECTIVE on hazardous areas where compliance

with IEC60079-14 is an additional requirement for

making electrical connections.

It is important to be aware of the EUROPEAN

DIRECTIVE on electromagnetic compatibility when

wiring up and installing equipment on site. Attention

must be paid to ensure that the techniques used

during wiring/installation do not increase

electromagnetic emissions or decrease the

electromagnetic immunity of the equipment, wiring or

any connected devices. If in any doubt contact

Flowserve for advice.

The motor must be wired up in accordance with the

motor manufacturer's instructions (normally supplied

within the terminal box) including any temperature,

earth leakage, current and other protective devices

as appropriate. The identification nameplate should

be checked to ensure the power supply is

appropriate.

A device to provide emergency stopping must

be fitted.

If not supplied pre-wired to the pump unit the

controller/starter electrical details will also be supplied

within the controller/starter.

For electrical details on pump sets with controllers

see the separate wiring diagram.

See section 5.5, Direction of

rotation before connecting the motor to the electrical

supply.

4.7 Final shaft alignment check

After connecting piping to the pump, rotate the shaft

several times by hand to ensure there is no seizure

and all parts are free.

Recheck the coupling alignment, as previously

described, to ensure no pipe strain. If pipe strain

exists, correct piping.

5.0 COMMISSIONING START-UP,

OPERATION AND SHUTDOWN

These operations must be

carried out by fully qualified personnel.

5.1 Precommissioning procedure

a) The bearing housing must be filled with the

indicated oil. Check also the oil level.

b) The pump must be completely filled with liquid to

avoid running dry and to guarantee a correct

performance of the pump.

c) During filling the pump shall reach the specified

temperature, so pumps for hot liquids (T > 150 °C

(302 °F)) shall be warmed up by preflushing.

d) Check the sense of rotation of the pump (Coupling

spacer dismantled).

Sense of rotation is clockwise viewed to the drive

end of the pump.

e) The pump rotor and the shaft seal must be in

correct axial position. Mounting plates of

mechanical seal must be locked at the seal gland

in open position. Drive-collar of the mechanical

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Flowserve Worthington WXB User Manual Page 17

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