place a butterfly valve in a underground system
place a butterfly valve in a underground system
(OP)
Is it allowed to place a butterfly valve with post indicator to isolate some seccion of a underground fire water circuit, or it should be a gate valve.





RE: place a butterfly valve in a underground system
You might check the code (NFPA, local codes) to see if there are any special requirements.
RE: place a butterfly valve in a underground system
Most jurisdictions will probably allow it, but why? A butterfly valve that is infrequently operated will generally accumulate solids on the seat and flapper, and will seldom give you very good shut off. If your fire circut is normaly quiescent, then solids will settle out. If it is normally flowing, then the bluff body in the flow puts interesting stress on stuff.
I really don't like butterfly valves in locations that are difficult to access.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: place a butterfly valve in a underground system
RE: place a butterfly valve in a underground system
Also butterfy valves have been known to jam open and then you cant get them out of the line easily.
RE: place a butterfly valve in a underground system
On the other hand, I work with low pressure / high flow applications and consequently just love 'em butterfly valves.
RE: place a butterfly valve in a underground system
RE: place a butterfly valve in a underground system