8.4 Diaphragm breakage
This section refers to figure Dosing head, exploded
view in section Dosing head overview.
If the diaphragm leaks or is broken, dosing liquid
escapes from the drain opening (fig. Dosing head,
exploded view, pos. 9) on the dosing head flange.
In case of diaphragm breakage, the safety diaphragm
(pos. 1) protects the pump housing against ingress of
dosing liquid.
When dosing crystallising liquids the drain opening
can be blocked by crystallisation. If the pump is not
taken out of operation immediately, a pressure can
build up between the diaphragm (pos. 3) and the
safety diaphragm in the flange (pos. 1). The pressure
can press dosing liquid through the safety diaphragm
into the pump housing.
Most dosing liquids don’t cause any danger when
entering the pump housing. However a view liquids
can cause a chemical reaction with inner parts of the
pump. In the worst case, this reaction can produce
explosive gases in the pump housing.
Warning
Danger of explosion, if dosing liquid has
entered the pump housing!
Operation with damaged diaphragm can
lead to dosing liquid entering the pump
housing.
In case of diaphragm breakage,
immediately separate the pump from the
power supply!
Make sure the pump cannot be put back
into operation by accident!
Dismantle the dosing head without
connecting the pump to the power supply
and make sure no dosing liquid has
entered the pump housing. Proceed as
described in section Dismantling the
diaphragm and valves.
To avoid any danger resulting from diaphragm
breakage, observe the following:
•
Perform regular maintenance.
•
Never operate the pump with blocked or soiled
drain opening.
- If the drain opening is blocked or soiled,
proceed as described in section Dismantling
the diaphragm and valves.
•
Never attach a hose to the drain opening. If a
hose is attached to the drain opening, it is
impossible to recognise escaping dosing liquid.
•
Take suitable precautions to prevent harm to
health and damage to property from escaping
dosing liquid.
•
Never operate the pump with damaged or loose
dosing head screws.
Related information
8.1 Regular maintenance
8.3.2 Dismantling the diaphragm and valves
8.3.1 Dosing head overview
8.4.1 Dosing liquid in the pump housing
Warning
Danger of explosion!
Immediately separate the pump from the
power supply!
Make sure the pump cannot be put back
into operation by accident!
If dosing liquid has entered the pump housing, or if
the safety diaphragm is damaged or worn:
•
Send the pump to Grundfos for repair, following
the instructions given in section Repairs.
•
If a repair isn’t economically reasonable, dispose
of the pump observing the information in
section Disposing of the product.
Related information
8.6 Repairs
10. Disposing of the product
8.5 Operation with loose dosing head
screws
Warning
Danger of explosion, if dosing liquid has
entered the pump housing!
Operation with damaged or loose dosing
head screws can lead to dosing liquid
entering the pump housing.
If the pump was operated with damaged or
loose dosing head screws, immediately
separate the pump from the power supply!
Make sure the pump cannot be put back
into operation by accident!
Dismantle the dosing head without
connecting the pump to the power supply
and make sure no dosing liquid has
entered the pump housing. Proceed as
described in section Dismantling the
diaphragm and valves.
Related information
8.3.2 Dismantling the diaphragm and valves
38
English (GB)
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