7 Installation, hydraulic
CAUTION!
Danger of injury to personnel and material damage
Disregarding the technical data during installation can
lead to personal injuries or damage to property.
– Observe the technical data - refer to the "Technical
Data" chapter and, where applicable, the operating
instructions for the accessories.
WARNING!
ATEX pumps in areas at risk from explosion
– Metering pumps must have an appropriate safety
relief valve on the discharge side (to protect against
excessive heating due to overloading or impact
sparks caused by the breakage of power end parts).
WARNING!
Danger of fire with flammable feed chemicals
– Flammable media may only be pumped using
metering heads made of stainless steel, Hastelloy C,
PRFE with carbon or PP with carbon.
–
Metering pumps can be used for metering flam‐
mable media, but fundamentally only those
designed with an ATEX diaphragm rupture sensor
and a discharge-side flow control, which both stop
the pump as soon as a diaphragm rupture or no flow
is detected.
– During filling and draining of the liquid end, an
expert must ensure that feed chemical does not
come into contact with oxygen.
– If necessary, the operator must implement further
measures.
WARNING!
Warning of feed chemical reactions to water
Feed chemicals that should not come into contact with
water may react to residual water in the liquid end that
may originate from works testing.
– Blow the liquid end dry with compressed air through
the suction connector.
–
Then flush the liquid end with a suitable medium
through the suction connector.
WARNING!
The following measures are an advantage when working
with highly aggressive or hazardous feed chemicals:
– Install a bleed valve with recirculation in the storage
tank.
–
Install an additional shut-off valve on the discharge
or suction ends.
Installation, hydraulic
27
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