PHP A-1 Instruction Manual / Hazard notes
11 Hazard notes
48
WARNING
Workings at the device only may be done by a trained
and authorised expert. Disconnect power supply before
working at the device.
Due to the design of the PHP pressure maintenance device
there are only marginal hazards.
Generally you have to keep in mind, that hot plant
media (e.g. heating water) could leak due to handling
at these devices.
For service and maintenance purposes a fill and drain tap
is provided at kompakt EMCK and modular PHP series
devices. Hot plant media could leak from this tap too.
Scalding risk exists in case of leakage.
Another fill and drain tap is installed at the lower vessel
flange (only at kompakt EMCK series) of the built-on vessel.
This tap is for service and maintenance purposes. If this tap
is opened, hot plant media could leak too.
Scalding risk exists in case of leakage.
A safety valve 0,5 bar is installed at the upper vessel flange.
This valve could open and discharge hot plant media due to
the following reasons:
• The device resp. the expansion vessel was dimensioned
wrong (too small) and the entire expansion volume can‘t
be stored in the expansion vessel.
• The level measurement doesn‘t work correctly due to
defective vessel pressure transmitters or a defective
vessel membrane. So the vessel could get overfilled.
• The vessel has been filled to a too high level in cold
situation (eventually because of the function “one-time
filling” or uncontrolled if no makeup module EMCF-1 V is
installed) without taking care of the occurring expansion
volume. So this expansion volume can‘t be stored
completely in the expansion vessel.
Scalding risk exists in case of leagage.
A further fill and drain tap is installed at the bottom of the
vessel. In normal operation there are no expected hazards
based on this tap. If the built-in vessel membrane is
defective, hot plant media could leak from this tap.
Scalding risk exists in case of leakage.
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