Small Vessel Question 3

[StoneCold]

I have a 50 gallon glass lined steel vessel.
The jacket on the vessel has developed a hole in it.
The vessel and jacket are ASME rated. Since the jacket is so small I am wondering if it is ok to just repair it in house and hydro test it to 1.3x design pressure?

Comments. Code rules?

Thanks
StoneCold

 

[waskillywabbit]

An ASME code stamped tank must be repaired by an ASME shop w/ a "R" stamp.

Brian

 

[Texastrav]

If there are no jurisdictional requirements, then the vessel may be repaired "in house" according to API 510. API 510 refers to ASME Sect VIII and has a lot in common with the NBIC repair code. If your site has adopted API 510 then there shouldn't be a problem performing the repair. You should review the document to determine the need for any additional NDE and/or pressure testing.

 

[PEHasan]

ASME Code Stamp Vessels are to be repaired by the workshop that possesses ASME "R" Stamp.

 

[JStephen]

I think Texastrav is correct. Specifically, Texas has no law requiring ASME construction for pressure vessels, unlike some other states (they do regulate boilers). Check your state boiler/ PV laws to see if there are specific requirements.

 

[StoneCold]

My angle on this is that the size of the vessel makes it small enough that ASME code does not really apply despite the fact that it was orriginally stamped as an ASME vessel.
Therefore we can repair the vessel in house and test it with out bringing in an R Stamped welding contrator.

Is that technically true or am I stuck with an R stamp repair?

 

[deanc]

Depends:

1.What does it contain? What pressure? See SecVIII Div1 U-1.

2.Contact your local Juridiction and maybe the Fire Marshall/Chief.

3.Contact your Insurance Carrier.

If these all agree and you do a non R stamp repair,remove the ASME markings.

Just remember to consider possiable liabilites if some later goes wrong.

 

[JStephen]

I doubt the size exempts it. If I remember correctly, 6" pipe and under is exempted, but there's not a capacity exemption in ASME.

As far as it developing a hole, this could be a single isolated pit or could be due to corrosion over a larger area- don't just assume that repairing the leak makes it safe. It's like a leaky tire, it can have a nail hole or it can just be a worn out tire that finally started leaking in one spot.

 

[waskillywabbit]

Excellent comments by both deanc and JStephen...you get stars...and Stonecold should heed their wise advice.








Brian

 

[StoneCold]

Thanks Guys
I guess I am off to find a local R stamp holder and then hydro the little beast.

Thanks

StoneCold

 

[Texastrav]

Once again, review your jurisdictional requirements before you make any costly decisions. The following article is very helpful if your laws are similar to those in Texas.

http://www.codeprep.com/ed_nbic_vs_api.htm