WOG valves 1

[joeswoes]

What constitutes a "WOG" valve ? I know it stands for water, oil, gas, but are there specific designs/materials/perfornance that are defined or assumed when making this description ?

Thanks in advance.

 

[jsummerfield]

This appears to be an obsolete term for class 6000 or 6000 pound applicable to forged fittings.

John

 

[JimCasey]

WOG (Water-Oil-Gas) valves are rated for their maximum cold working pressure. So if a valve is marked 300WOG it would be good for 300 psi at ambient conditions. There is no rating implied at nonambient conditions. This rating is apparently a manufacturer's rating and if tied to any code nobody in my engineering staff can tell me what code that would be. MSS-SP25 uses WOG and CWP(Cold Working Pressure)in conjunction, but there is no mention of any parameter or standard that must be met for a valve to be rated to a particular WOG classification. WOG valves are the commodity valve one would use when there is little if any need for an engineered product.

In contrast, ANSI (Now ASME) class 300 valves must meet B16.34 (usually) which stipulates minimum wall thicknesses, and pressure/temperature ratings for various ferrous alloys. For common WCB steel the B16.34 (shell) rating for a class 300 valve is 740 psi at 100F, 600 psi @500F, 410 psi @ 800F. These are rated working pressures at these temperatures. Cold Shell test pressures are 150% of the ANSI rated pressure, or in this example: 1110 psi.

 

[PAN]

For the example of JimCasey, test presssure of 1110 psi should be add one step to 1125 psi.