Steam valves
Steam valves
(OP)
Can anyone see an advantage / disadvantage to putting a bypass valve/pipework around a parellel slide valve on a HP steam system 110 bar and IP steam system 30 bar
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RE: Steam valves
Can you describe your system in more detail? With more information, perhaps some useful advice could be provided.
RE: Steam valves
slowly introduce steam and heat up pipework
after maintenance. Much much safer than trying
to crack open a full bore 110 Bar valve. Is that
the question?
RE: Steam valves
You should take precautions that if the piping in question is for supply to a steam turbine (for example) that there are appropriate "permissives" in the operating system to detect open valves, and ensure against a potential hazardous condition of uncontrolled steam supply in a shut-down situation.
RE: Steam valves
The small bypass line is typically installed on steam piping valves for a variety of reasons:
- Allows equalization of pressure before admission of flow
(a major advantage with large, hand-operated valves)
- Permits slow heat-up of piping, minimizing condensate slugs
- Lengthens life of large-valve sealing surfaces
The need for bypass valves on large valves is discussed in a chapter on steam piping in the "Piping Handbook" by Nayyar
My opinion only...
MJC