Re: [MW:20464] RT requirement for cat D fluids

Gents,

·                     Category D:

Flammable, unstable or toxic fluids which are gases or a mixture of gas and liquid with a TGLR>250 but H2S < 500 ppm in the gas phase at prevailing ambient temperature and atmospheric pressure plus 0.5 bar, i.e. the vapour pressure is higher than 1.5 bar (abs) at ambient temperature. Example: natural gas, liquid petroleum gas, ammonia, typical' low risk sour facility' or high GOR oil condensate and gas flowline fluids.

Extent of Required Examination:
"Examination" is not limited to welds. Records, materials, fabrication, erection pressure testing, as-built, must also be examined as specified by Code. Refer to Table 3 of 341.4.2 of ASME B31.3, for a list of examination attributes and the extent of required examination.

Table 3 - EXAMINATION OF MATERIALS, FABRICATION AND INSTALLATION

Extent of Required Examination
Material	Fabrication	Fabrication of Longitudinal Welds	Mechanical Joints	Erection	Complete system Meets Design (2)	Other Examinations
Category D	Random	Random	Random	Random	Random	Random	Random (3)
Normal	Random	5%(5)	100%	Random(1)	Random	Random	5% Vol. (4)
Category M	Random	100%	100%	100%	Random	Random	20% Vol.
High Pressure	100%	100%	100%	100%	Random	Random	100% Rad.
Severe Cyclic	Random	100%	100%	100%	100%	Random	100% Vol.
Notes: (1) When pneumatic testing is to be used, 100% of mechanical joints shall be examined. (2) Includes any additional examination or testing required by engineering. (3) Category D Systems require welds to be random visually examined.				(4) When brazed joints are used, 5% in-process examination is performed. (5) Socket welds require 5% visual examination of final weld. Note: Vol = Volumetric weld examination such as a radiography or ultrasonic. Rad = Radiography

 

With Best Regards,

Shashank C Vagal

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On Sunday, 30 March 2014 6:14 PM, CHINTUKUMAR GANDHI <cgandhi1975@yahoo.com> wrote:

Dear Mr. Maran,

With reference to the clause no. 341.4.2 of ASME B31.3 only visual Exam. is required. Please refer Para 341.3.2 for accept. criteria.

Thanks & regards,

C. R. GANDHI

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From: Elamaran Rajan <elams.rajan@gmail.com>
To: materials-welding <materials-welding@googlegroups.com>
Sent: Friday, March 28, 2014 5:57 PM
Subject: [MW:20425] RT requirement for cat D fluids

Dear Experts

What is the Radiography requirement for category D fluids with
reference to B31.3

Regards
--
maran

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