UB USER INSTRUCTIONS ENGLISH 71569247 07-04

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4.5.3Maximum forces and moments allowed on the pump suction and discharge flanges of horizontal shaft pumps

Type and size

 

 

Maximum forces (F) in kN (lbf) and maximum moments (M) in kNm (lbf·ft)

 

 

 

 

Suction

 

 

 

 

Discharge

 

 

 

Fx

Fy

Fz

Mx

My

Mz

Fx

Fy

Fz

Mx

My

Mz

8-UB-1

7.35

5.78

4.20

4.25

2.25

3.00

3.84

4.40

3.20

2.20

1.20

1.60

(1653)

(1299)

(944)

(3134)

(1659)

(2212)

(863)

(989)

(719)

(1622)

(885)

(1180)

 

Notes:

1)F = External force (tension or compression).

M = External moment, clockwise or counter-clockwise.

2)Forces and moments may be applied simultaneously in any direction.

3)Values apply to all materials.

4)Higher loads may be applicable, if direction and magnitude of individual loads are known, but these need written approval from Flowserve Pumps.

5)Pumps must be on rigid foundations and baseplates must be fully grouted

6)Pump/baseplate should not be used as pipe anchor. Suction and discharge piping should be anchored as close as possible to the pump flanges to reduce vibration and prevent strain on the pump casing. Expansion joints are recommended. They must be properly tied and located on the side of the pipe anchor away from the pump.

7)The pump mounting bolt torques specified must be used to prevent relative movement between the pump casing and

baseplate. (See section 6.6, Fastener torques.) The bolt material must have a minimum yield strength of 600 N/mm2 (87 000 lb/in.2).

4.5.4 Discharge piping

See section 4.5.2 for typical pipework design.

A non-return valve should be located in the discharge pipework to protect the pump from excessive back pressure and hence reverse rotation when the unit is stopped.

Pipework reducers should have a maximum total angle of divergence of 9 degrees.

Fitting an isolation valve will allow easier maintenance.

4.5.5 Auxiliary piping4.5.5.1 Drains

Pipe pump casing drains and gland leakage to a convenient disposal point.

4.5.5.2 Pumps fitted with packed gland

When suction pressure is below ambient pressure it is necessary to feed the gland packing with liquid to provide lubrication and prevent the ingress of air.

This is normally achieved with a supply from the pump discharge volute to the stuffing box.

If the pumped liquid is dirty and cannot be used for sealing, a separate clean compatible liquid supply to the gland at 1 bar (15 psi) above suction pressure is recommended.

4.5.5.3Pumps fitted with mechanical seals Single seals requiring re-circulation will normally be provided with the auxiliary piping from pump casing already fitted.

If the seal requires an auxiliary quench then a connection must be made to a suitable source of liquid flow, low pressure steam or static pressure from a header tank. Recommended pressure is 0.35 bar (5 psi) or less. Check General arrangement drawing.

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