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Steam valves

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

RE: Steam valves

cooper24,

Can you describe your system in more detail?  With more information, perhaps some useful advice could be provided.

RE: Steam valves

The arrangement described is typical; used to
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

Yes, as "jherbert" has said, bypass of a main, HP or IP valve for warm-up is common.  

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

cooper,

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

  

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