LARGE RADIUS BENDS
LARGE RADIUS BENDS
(OP)
In 30 odd years in petrochem, I have always understood that a 5D bend radius for example will be 5 x NOMINAL diameter.
In a currect job the CAD technician has based small diameter (2.5" nb) 5D bends on the ID ... honestly ... and the fabricator made the bends based on the OD. This means that nothing fits, and in my opinion is a cock-up all round.
Question ... Is there a formal (Code) reference to large radius bend identification being based on a multiple of the NOMINAL diameter out there ? I have not seen one.
In a currect job the CAD technician has based small diameter (2.5" nb) 5D bends on the ID ... honestly ... and the fabricator made the bends based on the OD. This means that nothing fits, and in my opinion is a cock-up all round.
Question ... Is there a formal (Code) reference to large radius bend identification being based on a multiple of the NOMINAL diameter out there ? I have not seen one.





RE: LARGE RADIUS BENDS
It looks to me like a cock up all around.
David
RE: LARGE RADIUS BENDS
Class WP fittings are manufactured to the dimensional requirements of ANSI B16.9 or ANSI B16.28 Class CR fittings are manufactured to the dimensional requirements and pressure ratings of MSS SP-43.
"Make everything as simple as possible, but not simpler." - Albert Einstein (1879-1955)
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http://virtualpipeline.spaces.live.com/
RE: LARGE RADIUS BENDS
BigInch nailed it. According to AMSE 31.8 and 31.4, if it is, for example, a 20" pipe and you want a 5D; it is 20*5 for the radius in inches.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: LARGE RADIUS BENDS
I would suggest that you take the "CAD Tech" out behind the barn and give him an education. I would reassign "CAD Tech" to a job where mistakes are not as costly until such time that he is properly trained in PIPING..
RE: LARGE RADIUS BENDS
Somehow for larger diameter piping 3.5 times the diameter should presumably give fairly long radius.
I recall someone visited during early 80's for our 18 Km long X-Country 6" dia pipeline while I worked at my previous employer used a 'Master caliber pig'. Who mentioned this figure for his caliber pig turning needs (probably Named Mr. Tom barker or so if my memory is correct?)
Best Regards
Qalander(Chem)
RE: LARGE RADIUS BENDS
"Make everything as simple as possible, but not simpler." - Albert Einstein (1879-1955)
***************
http://virtualpipeline.spaces.live.com/