Max wall thickness 1

[smart143]

What is the over thickness limit for SA333 Gr 6 pipe, I checked SA999 but it shows only minimum wall thickness requirement.

My vendor did some boring on sch XS pipe to bring it to sch STD but now thicknees is over by 22%
should I accpet or reject?

 

[SJones]

What is wrong with Table 7 in ASTM A333?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[metengr]

I did not see a Table 7 in the 2010 Edition of ASME Section II material specification for SA 333, but that could mean it is not the latest ASTM edition. In Table X1.1 of SA 999, you have minimum wall thickness and nominal wall thickness, the nominal wall is minimum wall/0.875. The nominal wall for your pipe should be no more than 12.5% above minimum wall thickness.

 

[smart143]

Steve,

I do not have copy of A333 but SA 333 cetainly do not have table 7.

Can you help me waht tolerance specified in table 7 in A333?

 

[smart143]

Thanks metengr, that means there is no over tolerance for seamless pipe in SA333, I can see for bored pipe para 10.2 in SA999, over thickness limit is 3.2 mm flat for all.so I will go by that as pipe is bored from highger schedule to lower schedule.

 

[smart143]

Thanks metengr,

So it means SA333 do not have over tolerance limit for wall thickness, under para 10.2 of SA999 bored pipe has over thickness limit of 3.2 mm so Iwill go by that

 

[SJones]

Sorry about that duff posting - there isn't a Table 7 in ASTM A333 either. I'll now have to try and find what ASTM standard I was looking at when I thought it was A333!

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[metengr]

Don't worry Jones, everyone makes mistakes.

 

[DekDee]

Guys,
A bit confused here so hopefully someone can clarify.
Why would there be any concern on pipe being thicker than it is supposed to be ?
If it is STD piping and a length of XS pipe or an XS fitting is installed it is no problem as long as the ends are transitioned as per code requirements.
The only issue would be the time / cost to smart143 to perform the transitioning themselves.
If the time/cost is an issue then reject it - 22% over thickness does seem way too much.
Cheers,
Dek Dee

 

[metengr]

I think the easy solution would have been to require the vendor to machine the pipe to 12.5% over minimum and be done with it. Thicker wall means more cost and added weight to the system. Added weight could mean new hangers. A potentially messy situation.

 

[SJones]

There is also the mass acceptance criterion of SA-999 to comply with.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[DekDee]

Thanks guys for the clarification,
Regards,
Dek Dee