Flowserve Worthington WXB User Manual download pdf (Page 44)

WXB USER INSTRUCTIONS ENGLISH - 07/14

Page 44 of 51

the fluid establish the required margin between fluid

vapor pressure (at the seal chamber temperature)

and seal chamber pressure. In a Plan 23, the cooler

only removes seal face-generated heat plus heat

soak from the process.

Plan 76 is suitable only for fluids, where no

condensation of the inner seal leakage or from the

collection system will occur.

Leakage from the inner mechanical seal is restricted

from escape by the containment seal and goes out

the containment seal vent. An orifice in the outlet line

of the collector restricts flow such that high leakage of

the inner seal will cause a pressure increase and

trigger the PSH set at a gauge pressure of 0.7 bar

(10 psi). The block valve in the outlet serves to isolate

the system for maintenance. It may also be used to

test the inner seal by closing while the pump is in

operation and noting the time/pressure buildup

relationship in the collector. If specified, drain

connection on the piping harness may be used to

inject nitrogen or other gas for the purpose of testing

the containment seal as well as for checking for any

liquid buildup.

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.

8.1.3 Dual Mechanical Seal pressurized with

API–Plan 53c+61

Refer to mechanical seal drawing and

auxiliary piping drawing.

The pump is equipped with a dual mechanical seal in

face to back configuration, back to back configuration

or face to face configuration.

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.

The mechanical seal requires no adjustment

anymore. Check if the mounting plates are already

swung out.

Actions after start up:

Check all connections to the seal gland and the

mechanical seal itself against leakage. Check the

temperature of the seal gland. I slight increase of

temperature may be observed during the run in

period.

Plan 53 pressurized dual seal systems are used in

services where no leakage to atmosphere can be

tolerated. A Plan 53c system consists of dual

mechanical seals with a liquid barrier fluid between

them. The barrier fluid is contained in a piston type

accumulator. Inner seal leakage will be barrier fluid

leakage into the product. There will always be some

leakage (max.5 ml/hour).

The leakage rate is monitored by monitoring the seal

pot level. The product must be able to accommodate

a small amount of contamination from the barrier

fluid. The seal pot pressure must be maintained at

the proper level. If the seal pot pressure drops, the

system will begin to operate like a Plan 52, or

unpressurized dual seal, which does not offer the

same level of sealing integrity. Specifically, the inner

seal leakage direction will be reversed and the barrier

fluid will, over time, become contaminated with the

process fluid with the problems that result, including

possible seal failure.

Fill the seal system with a suitable

barrier buffer fluid (refer to lubrication table).

Open all necessary valves in the

cooling and auxiliary piping and check the flow.

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 flushing fluid, 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.

8.1.4 API Plan K

Refer to auxiliary piping drawing.

The pump is equipped with an API plan K, cooling to

bearing housing with parallel flow to seal heat

exchanger.

Open all the valves in the cooling line before start up

the pump.

Check cooling flow at the

installed flow indicator. If required adjust flowrate with

the flow control valve.

Refer to the GA - drawing for the

required cooling flow and pressure.

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 50 51

Comments to this Manuals

No comments

Flowserve Worthington WXB User Manual Page 44

Comments to this Manuals

Related products and manuals for Pumps Flowserve Worthington WXB