Large Diameter Flange Specifications
Large Diameter Flange Specifications
(OP)
We are currently designing a piping system for a pulp mill in South America. Most of our systems are designed to ASME B31.1 or B31.3.
The problem: As our plants increase in output our pipe sizes are becoming larger and larger. Unfortunately the listed components (of B31...) no longer cover the size ranges that we are using.
Example - We have a titanium specification that goes up to 24 inch with class 150 lapjpoint flanges (175 psig @ 400F). Our process people have now sized lines in the system that are 28 and 30 inch. Calculating requirements for pipe, fitting and stub-ends is not difficult. The problem is with the flanges. For 24 inch and below our specification is a lap joint flange (A105, B16.5).
The solution: Cast Iron Flange lap joint flange to B16.1; Weld neck flange to B16.47 $$$; Fabricated plate flange.
Anybody have any advice or good ideas?
Thanks
The problem: As our plants increase in output our pipe sizes are becoming larger and larger. Unfortunately the listed components (of B31...) no longer cover the size ranges that we are using.
Example - We have a titanium specification that goes up to 24 inch with class 150 lapjpoint flanges (175 psig @ 400F). Our process people have now sized lines in the system that are 28 and 30 inch. Calculating requirements for pipe, fitting and stub-ends is not difficult. The problem is with the flanges. For 24 inch and below our specification is a lap joint flange (A105, B16.5).
The solution: Cast Iron Flange lap joint flange to B16.1; Weld neck flange to B16.47 $$$; Fabricated plate flange.
Anybody have any advice or good ideas?
Thanks





RE: Large Diameter Flange Specifications
We did purchase a flanges from the following company.
http://www.pacificflange.com/
RE: Large Diameter Flange Specifications
RE: Large Diameter Flange Specifications
How do you do the calculation if in not listed in AWWA C207 flanges?
Please give detail
Leonard Thill
RE: Large Diameter Flange Specifications
In this case I have decided that we will provide plate flanges, either back-up or slip-on per BPV code (Requirement of B31... for non-listed components).
Because the piping system (below 24") is designed with A105 lap joint flanges I cannot use AWWA flanges as they do not have the same ratings (I believe they are designed for 150 psig at some ambient temp).
Thanks again.