Flowserve Worthington WXB User Manual download pdf (Page 43)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 43 of 51

8.0 AUXILIARIES

8.1 Seal and seal systems

8.1.1 Single Mechanical Seal with API–Plan 11+61

Refer to mechanical seal drawing and

auxiliary piping drawing.

The pump is equipped with a single mechanical seal.

The cartridge design allows to change the

mechanical seal without taking it apart.

Try to turn the rotor by hand.If the

rotor cannot be turned, the pump must be

disassembled, refer to section 6.7.1 Dismantling

WXB.

Actions after start up:

Check all connections to the seal gland and the

mechanical seal itself against leakage. It is usual that

at the seal faces a small leakage occurs after start

up, which decreases with the time of operation and

should stop after the seal is run in. Check the

temperature of the seal gland. I slight increase of

temperature may be observed during the run in

period. The mechanical seal is flushed by an API

Plan 11 and the temperature at the seal gland should

be max. 10 °C (18 °F) above the pumped liquid

temperature, unless otherwise specified by

mechanical seal supplier.

In Plan 11, product is routed from the pump

discharge via an orifice to the seal chamber to

provide cooling for the seal and to vent air or vapors

from the seal chamber. Fluid then flows from the seal

cavity back into the process stream.

API Plan 61 has tapped and plugged connections for

the purchaser´s use. Typically this plan is used when

the purchaser is to provide fluid (such as steam, gas, or

water) to an external sealing device.

Refer to the GA - drawing for the

required quench medium, pressure and flow.

Disassembly of the seal cartridge

is only allowed by authorized personal. Contact

Flowserve for any service of the mechanical seal. We

recommend to have a spare cartridge seal on stock

for easy replacement.

8.1.2 Dual Mechanical Seal unpressurized with

API–Plan 23+72+76

Refer to mechanical seal drawing and

auxiliary piping drawing.

The pump is equipped with a dual mechanical seal.

The cartridge design allows to change the

mechanical seal without taking it apart.

The seal cartridge consists of a contacting wet inner

seal and a dry containment seal. A buffer gas is used

to sweep inner seal leakage away from the outer seal

into a collection system and/or provide dilution of the

leakage, so that emissions from the containment seal

are reduced.

The plan 72 system is intended to function as follows:

The barrier gas first flows through an isolation block

valve and check valve provided by the purchaser. It

then enters a system, usually mounted on a plate or

panel, provided by the seal vendor. An inlet block

valve on the panel is followed by a 10 µm (0.0004 in.)

filter coalescer (if specified) to remove any particles

and liquid that might be present. The gas then flows

through a back pressure regulator (if specified) which

is set at least 0.5 bar (7 psi) above atmospheric

pressure. Next comes an orifice to provide flow

regulation followed by a flow indicator to measure

flow. The pressure indicator is used to ensure the

pressure is not above the seal chamber pressure.

The last elements on the panel are a check valve and

block valve. Buffer gas is then routed to the seal

using tubing. A containment seal vent (CSV) and

drain (CSD) are also located on the gland.

The inner mechanical seal is flushed by an

API Plan 23.

Try to turn the rotor by hand.If the

rotor cannot be turned, the pump must be

disassembled, refer to section 6.7.1 Dismantling

WXB.

Actions after start up:

Check all connections to the seal gland and the

mechanical seal itself against leakage. It is usual that

at the seal faces a small leakage occurs after start

up, which decreases with the time of operation and

should stop after the seal is run in. Check the

temperature of the seal gland. I slight increase of

temperature may be observed during the run in

period. The mechanical seal is flushed by an API

Plan 23 and the temperature at the seal gland should

be below the pumped liquid temperature (refer to

mechanical seal drawing for temperature limit).

Plan 23 is the plan of choice for all hot water

services, and it is also disirable in many hydrocarbon

and chemical services where it is necessary to cool

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Flowserve Worthington WXB User Manual Page 43

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