IOM/CPHM/DEC19/01 ISSUE DATE:14-12-2019
Page 17 | 48 REVISION NO.1
CAUTION:
Please refer to the CS drawing supplied against O/A for flushing/product recirculation
recommendation.
5.4.3 Quenching:
Quench fluids are introduced to the low pressure side of seals for following reasons.
a. Cooling to remove heat from stationary seal faces and mechanical seal cover.
b. Smothering to prevent air from reaching the low pressure side of seal face. In
some cases, sealed fluids can react with air to form a sticky residue, which
might interfere with seal operation.
c. Cleaning to remove any accumulation which may develop at the low pressure
side of the seal faces.
Quenching liquid media shall be recommended by seal manufacturer. Quench should
be supplied at a low pressure of 0.5 to 0.7 kg/cm2 in order to avoid the leakage of
the same through throttle bush. Quench quantity should be approximately 0.3 to 0.5
m3/hr.
CAUTION:
Please refer to the cross-sectional drawing supplied for quenching recommendation if
any against order.
Throttle bush for mechanical seals:
This bush is pressed in the mechanical seal cover. This bush gives protection in case
of seal’s failure. Due to the close clearance between bush and shaft sleeve, if the seal
fails, the pressure of the product is reduced before it escapes. This bush is also
minimizes the quench leakage along the shaft. To avoid possibility of sparking, the
bush is made of non-ferrous material as per API 610 specification. This bush is
provided for single inside seals only.
Flushing at the seal face is necessary to provide lubrication, heating or cooling of the
seal faces and densing action. Pump should not run without flushing at the seal face
unless specifically recommended by seal manufacturer.
6. OVERHAULING:
PROCEDURE FOR DISMANTLING AND RE-ASSEMBLING.
While dismantling and re-assembling, the cross-sectional assembly drawing and
specification part list should be referred.
6.1 Dismantling:
Follow the following steps to dismantle the pump.
6.1.1 Isolate power supply of motor.
6.1.2 Shut off valves controlling flow to and from the pump.
6.1.3 Drain the liquid from the pump by removing the drain plug (601) or open the pump
casing drain cock.
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