A333 Low Temperature Pipe

[ProjEngKLS]

I'm examining the potential for using ASTM
A333 Grade 6 for a -50 °F system.

Its obvious to me that this will be a more expensive system than our typical A106 piping (for warmer temps), but I don't have a good feel for how much.

Does anyone have a feel for relative installed costs of A106 vs A333 vs T316LSS pipng systems in the 4" - 6" size range?

Also what types of gyrations will I have to go through for a A333 specification? New weld procedures? Certifications? ??

Any Information is appreciated.


thanks

 

[prex]

A333 Gr.3 is practically the same as A106 B, apart from impact requirements, so there should not be any significant cost increment.
With stainless steel of course there is a substantial cost increase (at least the double), not only because of the cost of pipe itself, but also for fittings, valves, etc. prex

http://www.xcalcs.com

Online tools for structural design

 

[Flareman]

You can expect to pay a little more going from A-106 with comparable fittings to A-333 Gr6 with A-350 LF2 fittings. Maybe up to +20% overall.
The same uplift to stainless steel (18/8) would probably be x2 or x3.
Generally it's commercially viable to go with A-333 Gr6 rather than stainless. The fabrication issues are not too difficult. Check the guidelines in a standard such as ASME B-31.3 section 323. Most good fabricators will have no difficulty meeting the impact test for the PQR.
If you're doing this yourself, you will need PQRs with impact test so that's a newbie if you don't have 'em yet.

 

[lethcoeb]

ProjEngKLS,
FYI, I just had to switch from 4" Sch 160 A106 Gr. B pipe to 4" Sch 160 A333 Gr. 6 pipe for a project (due to low impact and shear results on the A106) and the cost delta was about $4/foot in the good direction! This cost delta is only for the pipe, but as we needed weld qualification regardless of the material, it looks like I might end up ahead on this.