Flowserve 955 Chemiepac - Manual (Page 9)

Installation, Operating and Maintenance Instructions Chemiepac Mechanical Seal
components must be monitored at all times by a device that shuts down the
machine once a critical temperature is reached. This device can consist of
resistance thermometers or thermoelements.
8.1 The installed MS is bi-directional.
8.2 The sealing chamber must be vented carefully before startup.
8.3 During the static pressure test on the pump the test pressure must not exceed the
specifications (see § 1.1).
8.4 To carry off the heat generated by friction and to prevent deposits in the area of the
seal faces, adequate circulation must be ensured for the supply fluid, e.g. forced
circulation.
At all operating temperatures the product must not come within 20 K of its
evaporating point. Should this not be the case during certain operating situa-
tions (e.g. shutdown, start-up) forced circulation or adequate cooling must be
generated to promote heat removal.
Escaping leakage must not form an explosive mixture.
8.5 Pressure should be applied to the product in a step-by-step process, and not abruptly.
Exceeding the max pressures given under item 1.1 will cause damage to the
MS.
8.6 Operation, malfunctions
SYMPTOM CAUSE
Large loss of product - shaft eccentric.
- pipe connection leaks.
- damage to the MS
(product exits into atmosphere)
Fluid supply temperature
too high
- product pressure too high (higher friction)
- lack of supply fluid
8.7 The pump shaft may be stopped at any time.
9.0 SHUTTING DOWN, REMOVAL
9.1 The machine may be shut down at any time under normal circumstances.
9.2 Before the MS is removed the machine must be shut down and depressurised.
9.3 The shaft may be shut down under pressure.
9.4 Remove the MS by following the instructions for installation in reverse order.
Removing the pressure transmitter may release medium! All information and
!
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