Joint category

[Muhammed Ibrahim]

Hi gents,

 

What is the joint category for lip type nozzle to shell weld?. Since it is butt weld is it include in Category A?. Sec. Viii shows the sketch of joint category nozzle to shell as cat. D.

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Thanks & Regards
Muhammed Ibrahim PK

[Arunachalam A]

It is called catagory D butt weld, with RT requirements.

 

arun

--
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[G Padmanabhan]

Hi,
I agree with Category D joints.but RT requirements depends upon
eithere nozzle size or service condition requirements.

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With Warm regards,

G.Padmanabhan
00967771103169

[Arunachalam A]

The following are the Code requirements for Category D butt welds:

 

UW-11 RADIOGRAPHIC AND ULTRASONIC EXAMINATION

(a) Full Radiography.

The following welded joints shall be examined radiographically for their full length in the

manner prescribed in UW-51:

(5)

all Category A and D butt welds in vessel sections and heads where the design of the joint or part is based

on a joint efficiency permitted by UW-12(a), .....

 

Nozzle size does not come into picture here. The butt joints need to be RTed depending on weld efficiency.

 

arun

[amje]

all nozzle to shell joints r always catagory d.

[Arunachalam A]

Yes, all nozzle to shell joints are category D welds.

 

There are many types of category D welds.

1) Category D groove welds - when nozzle is either set-on or set-in type.

2) Category D butt welds- when nozzle is having lip type ends..

3) Category D fillet welds- when nozzle to shell weld is fillet welded without full penetration.

arun