Dear Experts, Am Here facing a p 1

[CREERAAM]

Dear Experts,

Am Here facing a problem in ASTM A 234 Gr. B Pre insulated FITTING a problem like cavity in parent material. I Suggested to weld and grind it. IT IS OK?


Photo attached for reference. or otherwise i can have any other option?

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[SectionIX]

What is the size and thickness of the fitting, and the depth of the imperfection? What specification was it manufactured to, and what is the product and pressure?

I would evaluate the imperfection to the manufacturing standard....Calculate the tmin. If acceptable, I would leave it as-is, and not attempt to repair it by welding as this will create more problems.

 

[LittleInch]

Don't weld. Normally prohibited by most specs I've ever seen.

This is an extract from API 5L and would normally apply. So long as you end up with the minimum thickness > nominal minus your manufacturing tolerance it will be ok. Looks like poor QA on the pipe suppliers side, but also looks like a minor blemish to me ( difficult to see what size and depth it is)

C.2 Treatment of dressable surface defects
C.2.1 All dressable surface defects shall be dressed-out by grinding.
C.2.2 Grinding shall be carried out in such a way that the dressed area blends in smoothly with the contour of the pipe.
C.2.3 Complete removal of defects shall be verified by local visual inspection, aided, where necessary, by suitable non-destructive inspection methods. To be acceptable, the wall thickness in the ground area shall be in accordance with 9.11.3.2; however, the minus tolerances for diameter and out-of-roundness (see 9.11.3.1) shall not apply in the ground area.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[CREERAAM]

Dear Mr.SectionIX,

Thanking you.

48" 45 Deg ELBOW SCH STD 9.53mm THK. Depth of cavity is 4mm. ASTM A 234 WELDED STEEL FITTINGS. Working Pressure i don't what is in site. We only supply Pre-insulated.



REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[LittleInch]

Sounds like a reject to me.

You don't want to be repairing these sorts of defects in a new fitting.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[CREERAAM]

Dear Mr.LittleInch,

No. We decided to weld and grinding and PT test.

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[LittleInch]

That's your risk. You asked if its OK and you've ignored the advice that it's not Ok. That's your call just so long as you know.

Now knowing this is a fitting, the only reference I can find to repairs is MSS-SP-75 which limits repair by welding to < 33% of wall thickness - you're at 42%.

Also the weld repair needs to be done to a qualified weld procedure by a qualified welder and then possibly heat treated. Just doing a simple Pressure Test? won't tell you anything about long term stresses or cracking potential.

You can't just get some welder to stick a blob of metal in there and then grind it smooth....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[CREERAAM]

Dear Mr.LittleInch,

This fitting going to use in CHILLED WATER line is it risk?


Normally i don't suggest repair welding RM. That's my Boss risk.But any how i learned from you.


Thanking You.

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[LittleInch]

Who knows,

It's a relatively thin fitting (D/t>100) and depending on how much stress it's under and how many times it flexes as it goes from normal to cold.

In reality it's unlikely to fail, but it's not good practice to do this sort of repair at that sort of depth.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[CREERAAM]

Dear Mr.LittleInch,

Thanking You.

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[DSB123]

CREERAAAM,
Hopwe you will be advising the Purchaser of what you have done to repair the bend!!! He could well reject the item!!