A 201 Gr. B FBX ?? 1

[JLSeagull]

I have old P&ID's that reflect spherical tanks marked A-201-GR.B FBX. These spheres handle mixed C4 hydrocarbons. I don't find A 201 in ASTM or ASME. I don't know what FBX is. If this is an old ASTM it does not show up in my searches. What material is this; what typographical error might exist; what should I check?

 

[unclesyd]

The Standard has been withdrawn (1967). You can order it at Global Engineering Documents, in the left hand column on the following page. You will have to get a Code Book for the year of the design/fabrication of the vessel for the allowables.
This was a widely used steel.

http://www.astm.org/cgi-bin/SoftCar...ocs/astm.org/DATABASE.CART/WITHDRAWN/A201.htm

 

[JLSeagull]

Thanks!

 

[unclesyd]

I just checked to make sure that this material was used to fabricate Anhydrous Ammonia and Propane Storage bullets. The kicker was it had to meet ASTM A 300 specifications, another obsolete specification.

 

[jte]

JLS-

SA201 was a C-Si steel similar to SA212. Both were replaced by the SA515/SA516 series steels in 1967 as UncleSyd pointed out.

FBX is short for "firebox", sometimes aka FBQ for "firebox quality". Basically a better quality, but I was under the impression that SA212 was inherently "FBX" though it is often referred to with the additional callout. Not sure about SA201 being any different from SA201 FBX, though...

For SA201 grade B for Section VIII applications in 1962, the SMTS is 60,000 psi, the max allowable stress in tension is 15,000 psi up to 650°F. Allowable stresses are listed up to 1000°F, though I doubt your spheres are operating hot...

jt