Flowserve Worthington WXB User Manual download pdf (Page 26)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 26 of 51

5.3 Impeller clearance

No axial adjustment of the rotor is necessary.

The rotor is not moving during operation.

5.4 Direction of rotation

The sense of rotation of the

pump is clockwise (CW); looking from the coupling to

the shaft end of the pump.

The rotation of the driver shall be checked.

5.5 Guarding

Be sure that the coupling guard is mounted correctly

at the baseplate prior to start up.

5.6 Priming and auxiliary supplies

The pump must be completely primed prior to start

up.

a) The pump casing is considered as self venting,

so no vent connections are provided.

b) Auxiliary systems, e.g. barrier /buffer fluid

systems, cooling circuits, shall be filled according

to the user instructions.

Ensure that balance line is open.

Closed balance line leads immediately to a damage

of the pump. (This does not apply for opposed

impeller pumps). In case of an external balance line it

is recommended to install a pressure gauge right

after the pump. The measured pressure must not be

more than 2 bar (29 psi) above suction pressure.

5.7 Starting the pump

a) Start the driver according to the specification.

(Refer to driver IOM).

Pumps are usually started against

closed discharge valve.

Check the discharge and suction pressure gauge

to verify the pumps delivered head. Open the

discharge valve slowly, until the pump reaches the

specified operation point. The pump must operate

smoothly, and the vibration must be below 3 mm/s

(0.12 in./sec) (API 610 vibration limits).

The discharge valve must be opened

within 30 sec. after start up. Longer operation

against closed discharge valve will damage the

pump. If a minimum flow valve is installed, take

pressure gauge readings to verify the correct

operation.

If the backpressure of the discharge

pipe is sufficient, pumps can be started against

open valve.

Ensure that your driver is capable deliver

the higher torque required by starting against

open valve.

To prevent the pump from reverse rotation

after shut down, the installation of a check valve

is recommended.

Although the pump is not affected by reverse

rotation because of special coupling design, it can

be an issue with the driver.

Check the discharge and suction pressure gauge

to verify the pumps delivered head.

The pump must operate smoothly, and the

vibration must be below 3 mm/s (0.12 in./sec) (API

610 vibration limits).

If a minimum flow valve is installed, take pressure

gauge readings to verify the correct operation.

c) Check the pipe system against any leakage.

d) Check the mechanical seal against any leakage.

Right after start up a minor leakage

of the mechanical seal is quite normal. Normally

this leakage disappears after few minutes of

operation.

5.8 Operation

a) Verify that the pump is operating within the

specified limits, min/max flow, pressure,

temperature, vibration, power

b) The bearing housing temperature shall not exceed

80 °C (176 °F). If higher bearing temperature are

observed, check the viscosity grade of the used

lubrication oil.

The minimum viscosity is 10

cSt at the expected oil temperature.

(Oil temperature = bearing gland temperature

+ 10 °C (50 °F))

c) From time to time check the pump shaft seal.

Leakage of 10 - 20 drops per hour is also with a

mechanical shaft seal unavoidable.

d) Observe the power consumption of the pump to

detect excessive wear.

5.9 Stopping and Shutdown

a) Close the outlet valve, but ensure that the pump

runs in this condition for no more than a few

seconds.

b) Stop the pump.

c) Switch off flushing and/or cooling/ heating liquid

supplies at a time appropriate to the process.

d) For prolonged shut-downs and especially when

ambient temperatures are likely to drop below

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Flowserve Worthington WXB User Manual Page 26

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