HG-CF-1184 Rev. C, 16/11/12 Page 9
EXHAUST SAFETY WHEN PUMPING HAZARDOUS LIQUIDS
Suction Lift Installation
Flooded Suction Installation
Submerged Installation
Exhaust Safety :-
When a diaphragm fails during operation, pumped liquid can enter and contaminate the air side of the pump. If diaphragm failure is not
severe, i.e. a small split or hole, then the pump can continue to run, with air being forced into the product being pumped. If however the
failure is more serious, then the pump may stop, with fluid or fumes being expelled through the exhaust. Under these conditions it is
recommended that the exhaust is piped away to a safe area. In standard suction lift conditions this can simply be done by piping from the
exhaust connection to a safe area. Multiple installations can be piped to a common connection, then to a safe area. In flooded suction
conditions the exhaust must be taken to a point higher than the fluid level to prevent any siphoning away. In submerged conditions ensure
exhaust is piped away above fluid level.
In all conditions ensure exhaust outlet is not expelling across a non-conductive surface. The exhaust must not be placed less than 100mm
from any non-conductive surface, as this may generate a propagating brush discharge resulting in a possible ignition source.
In the event of diaphragm rupture, pumped material may enter the air end of the pump, and be discharged into the atmosphere. If pumping
a product which is hazardous or toxic, the air exhaust must be piped to an appropriate area for safe disposition.
WARNING!
In situations where the temperature of the fluid to be pumped is likely to exceed 100°C, a high temperature pump
code must be specified. This is signified using an ‘X’ in the last part of the pump code as shown.
“XTS” in place of “TTS”.
This indicates the following specification amendments :-
All seals and o-rings will be changed from Buna-N to Viton and back-up diaphragms and any bump-stops will be
changed to Viton.
See table below for parts effected :- (refer to main table for quantities / pump)
These items are available in recommended spares kit :- ASK2505HT
HIGH TEMPERATURE SPECIFICATION
REF. NO 23 25 26 27 31
DIA. SHAFT
SEAL
O-RING
O-RING O-RING SUPPORT
DIAPHRAGM
VITON G536 G508 G533 G509 1A039
24
DIAPHRAGM
SHAFT BUSH
40-194
HIGH TEMPERATURE INSTRUCTIONS
(12 pages)
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