2.4.6 Particular dangers
Safe handling of pressure vessels
There are two types of pressure vessels:
•
Pressure vessels for static load: The pressure vessels are under virtually con-
stant operating pressure, and the pressure fluctuations are very small. Pres-
sure vessels for static load are not specially marked and can be operated as
long as no safety-relevant faults are found during the regular vessel repeat
testing procedures.
•
Pressure vessels for dynamic load: The pressure vessels are under fluctuating
operating pressure, and the pressure can fluctuate between atmospheric pres-
sure and the maximum permissible operating pressure. Pressure vessels for
dynamic load are specially designated for dynamic loads in the type plate. In
the technical documents for these vessels, you will find details concerning the
permissible operating duration in the form of the permissible cycle figures de-
pending on the fluctuation of the operating pressure. The change between two
different pressures is designated as a load change. Two load changes, i.e. one
pressure approach and one pressure departure, are a cycle.
Follow the following safety instructions to ensure safe handling of pressure ves-
sels:
•
Always observe the permissible operating method of the pressure vessel.
•
Never open or release the vessel covers or pipe connectors under pressure.
Always de-pressurise the vessel or machine.
•
Never exceed the permissible vessel operating pressure.
•
Never heat the vessel or other individual parts above the stated maximum op-
erating temperature.
•
Damaged pressure vessels should always be replaced completely. Pressurised
vessel components cannot be obtained as spare parts because the vessels are
only ever tested and documented as a unit (see pressure vessel documenta-
tion, serial numbers).
•
Check pressure vessels regularly internally and externally for corrosion dam-
age.
•
Take particular care with used pressure vessels if their previous operating
method has not been clarified.
•
In order not to load the pressure vessel unnecessarily, always check the non-
return valves and pressure maintaining valves at regular intervals for internal
and external leaks and functionality.
•
Replace aluminium pressure vessel at the latest after 15 years.
•
In the case of pressure vessels for dynamic load: Record the number of cycles
completed. Note down the number of cycles run if there is no automatic cycle
counter.
•
In the case of pressure vessels for dynamic load: When half the permissible
number of cycles is reached, the vessel must be subjected to an internal test
which includes testing the critically loaded vessel areas using suitable test
procedures in order to ensure operational safety.
•
In the case of pressure vessels for dynamic load: After reaching the permissi-
ble number of permissible cycles, the vessel must be replaced and scrapped.
2 | For your safety
OPERATING MANUAL
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A_Compact-Line_002_en
10-10-2016
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