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?
Refer to Piping Fabrication Institute standard PFI ES-3.
How do you "notice" 1/2 degree on a 48" valve?
The clearance between the bolt o.d. and the hole i.d. would certainly allow for small angular tolerance. 

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