Acceptance criteria as per B 31.3

[Prasad Rode]

Dear sir,

We have the process piping, according to B31.3
According to table 341.3.2, under M category fluid, acceptance for the length of incomplete penetration is given as should be less than or equal to 38mm in any 150mm weld length.
My query is that, M category fluid comes under toxic means product service which makes harms to human being.
Under such category, how asme code says that such long incomplete penetration is allow.
Contractor is taking the full advantage of it. We are very serious as per our product is concerned.

Where as, ASME sec viii div I, completely reject the crack, incomplete Penetration and incomplete fusion.

My point is that, B 31.3 could been also be strict for LP, LF and crack specially for toxic service pipe lines/ process lines.


Regards
Prasad

[Dinesh Somwanshi]

Dear sir,

Its need to inform you that the code has defined minimum acceptance level . In which client has right to make strict acceptance criteria in lieu of in Project Specs its normal practicing now.

fyi.

*DINESH VITTHAL SOMWANSHI*

*BACHELOR IN MECHANICAL ENGINEER*

*AUTHORIZED PIPING / WELDING / NDT / PAINTING INSPECTION PERSONNEL,*
*API 570 - Piping Inspector,** AWS - CWI , CSWIP 3.1*,*BGAS  Gr 2 / 3*
*NDT II -UT , RT , MT , PT, VT*
00919881344135
Skype = dinesh570_1

असो द्यावी दया तुमच्या लागतसे पाया.

*Pray for others, sometime, You might never need to pray for yourself
again.....*

Prasad

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[Perumal Govindan]

Hi

Find out the fluid service in the design basis for that particular piping class or get it confirmed by process and design discipline.
Once the fluid service is known, then find out the exact service category and do the interpretation.

Regards
P Govindan

[Manoj Singh]

Under category m fluid IP is zero as per table 341.3.2. Pls.recheck

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[Prasad Rode]

Dear sir,

Sorry for late reply.

As per ASME B31.3 2008, tolerance is the same of 38mm. Pls revert.

Regards
Prasad

[Prasad Rode]

Dear sir,

Sorry , but I repeating my query.

We have the process piping, according to B31.3
According to table 341.3.2, under M category fluid, acceptance for the length of incomplete penetration is given as should be less than or equal to 38mm in any 150mm weld length.

My query is that, M category fluid comes under toxic means product service which makes harms to human being.
Under such category, how asme code says that such long incomplete penetration is allow.

Where as, ASME sec viii div I, completely reject the crack, incomplete Penetration and incomplete fusion.

My point is that, B 31.3 could been also be strict for LP, LF and crack specially for toxic service pipe lines/ process lines.

I have latest code also, and acceptance criteria found same.


Regards
Prasad

[rudi.jrneves]

Dear Sir

You have to evaluate the cumulative length of incomplete penetration but also the depth (≤ 1 mm (1⁄32 in.) and ≤ 0.2Tw), according to table 341.3.2.
As it is not possible to verify the exact depth of the incomplete penetration (talking about RT interpretation) and if the contrast of film is clear, i usually do not accept more than 5-10mm cumulative length in M category fluid. Again, the code has defined minimum acceptance level.

Regards