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 Post subject: SW / Flanged valve in refinery piping
Unread postPosted: Sat Nov 01, 2008 9:39 am 
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Joined: Thu Oct 16, 2008 5:44 am
Posts: 31
Location: India
Flanged valve should be used ([b]for maintenance purpose [/b]) irrespective of size & service at : 1) At point of insulation break (generally at valves) 2) At bypass 3) At point of spec break viz. change in rating , corrosion allowance , change in piping material , etc. 4) Where spectacle blind is provided close to valve Pl. give info about it & clear my doubts regarding this.

Thanks.

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SR


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 Post subject:
Unread postPosted: Sat Nov 01, 2008 4:56 pm 
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Joined: Fri May 26, 2006 7:47 pm
Posts: 843
Location: Florida, USA
Years of Experience: 45
Country: United States of America
The answer to your question is both "Yes" and "No"!

"Flanged valve should be used for maintenance purpose irrespective of size & service at: " Yes, if the Line class and the size is flanged. No if the size is too small to be flanged (Screwed or Socket-Weld).

1) At point of insulation break (generally at valves) Same answer applies here.

2) At bypass Same answer applies here.

3) At point of spec break viz. change in rating , corrosion allowance , change in piping material, etc. Same answer applies here.

4) Where spectacle blind is provided close to valve. Same answer applies here. If you are putting in a Spec Blind in a small line (2" /50mm or smaller) you keep the screwed or socket-weld valve and only add a pair of flanges not a more expensive flanged valve.


Pl. give info about it & clear my doubts regarding this. I hope this will help.


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