In my many years of cats/specs work, I have yet to build an API spec, until now.
Can someone post an abbreviated sample spec? What I am looking for are TUBE, ELBO, REDU, TEE, FLAN (everything else can be derived from those).
One question is how the PBORs are supposed to be set. You have ASME B36.10 pipe with the NPS convention vs the API nominal size, which do not match. How are these harmonized?
Not only that, the small diameter dimension of the flanges change when you change pressure ratings in API 6A, but remaim constant in whatever pressure class under ASME B16.5.
Do you have to have special API pipe and fitting catalog elements to accomodate the API sizes?
This whole thing is very confusing and I am sure this kind of thing has cropped up somewhere before. Any help is welcome.
It all very much depends on the pressure rating and what is required in the written pipe spec.
Pipe is ASME B36.10
For fittings Check out ANSON Pipe Fittings (elbows tees and Hammer Lug unions) ASME B16.9 thick wall may be used. (See written Spec)
Flange bores can be matched in one of two ways.
1. Request that the manufacturer supplies a the flanges with a counter bore transition piece factory fitted.
2. Request that the manufacturer supplies the flanges counter bored. (This is the more common)
Method 1 is probably the simplest from a Cats & Specs point of view.
Method 2 poses more of a problem.
Depending on the spec Rating the pipe wall thickness will obviously vary. This creates a problem in Flange selection.
eg
Spec rating 5000# For a nominal 2" flange requiring a wt of 13mm a 1.13/16" API 6 flange can be counterbored to suit.
Spec rating 10000# For a nominal 2" flange requiring a wt of XXS you would need to use a 2.1/16" API 6 flange to accommodate the counterbore.
Similar problem at 4" nom Size between 3.1/16" and 3.1/8" and others will appear as you get to larger sizes (i only covered up to 6") and at higher pressures like 20000#
I got round it by creating 2 SCOMs for the nom size and used the last 2 digits of the scom name to distinguish between the two flanges
so.. AJ 1.13/16" used as 2"
BJ 2.1/16" used as 2"
DN 3.1/16" used as 4"
EN 3.1/8" used as 4"
First of all, thanks pitch for the great reply, as it is beginning to help my understanding.
The scenario that you outlined in Method 2 is the likely candidate, where the flanges will be counterbored (why did API feel the need to do it this way, but I digress)?
For example, our spec has 2.1/16 inch nominal size flanges for psi 15 000 (103,5 MPa). Do I do something like Case A or Case B?
[/COLOR][/SIZE][/FONT][FONT=Lucida Console][SIZE=2][COLOR=black]Case B[/U]
[/U]
[FONT=Lucida Console][SIZE=1][COLOR=teal]TYPE NAME PBOR1 STYP SHOP CATREF DETAIL MATXT CMPREF BLTREF
FLAN */FLG 2.06 FLG TRUE /ZZZZZ /ZZZ-D /ZZZ-D /STUFF =0
[/COLOR][/SIZE][/FONT]
[FONT=Tahoma][SIZE=2][COLOR=black]In Case B, would you need to have a corresponding bore of 2.06 in the TUBE section of the spec?
Also, for the SCOM data, does the identified PBOR from the PTSET need to match, or does the SPECON element overide that? It would seem like the the PTSET data would need to match.
Anyway, this all seems rather problematic from a Cats/Specs point of view. But, I am sure it can be setup where things work. I just want to get things right while I rethink this process.
Case A[/U]
