Tolerance For Straddling Centerline
Tolerance For Straddling Centerline
(OP)
We have a 3 piece ball valve 48" Class 300. Noticed that when bolted together the straddle of the centerline is about 1/2degree off. Does anyone know of the tolerance and in what standard it might be in?





RE: Tolerance For Straddling Centerline
Refer to Piping Fabrication Institute standard PFI ES-3.
NozzleTwister
Houston, Texas
RE: Tolerance For Straddling Centerline
The clearance between the bolt o.d. and the hole i.d. would certainly allow for small angular tolerance.