AWWA C207 Flange Bolting

[pipe15]

Does anybody know when the AWWA C207 standard changed the bolting requirement from only mentioning A307 bolting to A307 bolting for Class B & D and A-193 bolting for Class E & F.

also, AWWA C207-01 lists only A194 nuts regardless of the bolt material in lieu of what can be found in the A307 designation (A563 nuts)

any thoughts on why A-194 nuts would be required for the A307 bolting?

thanks
mark

 

[rconner]

A-194 nuts are not required in C307 bolting for Class B&D flanges per AWWA C207-07 (I suspect a clarification appeared in later standards than what you are looking at).

 

[pipe15]

Thanks Rconner. I was looking at the 2001 edition. this is good to know since 2-3/4" nuts were already bought to the 563 standard.

 

[rconner]

that's some (high dollar) "big-uns" ;>)