Examination Radigraphy Test in piping with Gas Flowing

[wicaksono281]

Hi there,

So, I was wondering what is the standard or code that use for radiography examination in piping with gas flowing?
I know that some and standard like API and ASME. The thing is I've perused API and ASME but to no avail. Can you point me as to where i can find these in the subject code or standard?? thanks again really

hope you guys big help.

Rgdz,

WAW

 

[weldstan]

RT of an operating facility is done at the discretion of the Owner/Operator and is done to its standards which are often the Code of original construction depending on what flaws they are looking for.

 

[SectionIX]

See 192.243(a) below. Note that Radiography, nor any other specific NDE method is specifically identified.



Excerpt From the Code of Federal Regulations:

http://www.ecfr.gov/cgi-bin/text-id...&tpl=/ecfrbrowse/Title49/49cfr192_main_02.tpl

§192.243 Nondestructive testing.

(a) Nondestructive testing of welds must be performed by any process, other than trepanning, that will clearly indicate defects that may affect the integrity of the weld.

(b) Nondestructive testing of welds must be performed:

(1) In accordance with written procedures; and

(2) By persons who have been trained and qualified in the established procedures and with the equipment employed in testing.

(c) Procedures must be established for the proper interpretation of each nondestructive test of a weld to ensure the acceptability of the weld under §192.241(c).

(d) When nondestructive testing is required under §192.241(b), the following percentages of each day's field butt welds, selected at random by the operator, must be nondestructively tested over their entire circumference:

(1) In Class 1 locations, except offshore, at least 10 percent.

(2) In Class 2 locations, at least 15 percent.

(3) In Class 3 and Class 4 locations, at crossings of major or navigable rivers, offshore, and within railroad or public highway rights-of-way, including tunnels, bridges, and overhead road crossings, 100 percent unless impracticable, in which case at least 90 percent. Nondestructive testing must be impracticable for each girth weld not tested.

(4) At pipeline tie-ins, including tie-ins of replacement sections, 100 percent.

(e) Except for a welder or welding operator whose work is isolated from the principal welding activity, a sample of each welder or welding operator's work for each day must be nondestructively tested, when nondestructive testing is required under §192.241(b).

(f) When nondestructive testing is required under §192.241(b), each operator must retain, for the life of the pipeline, a record showing by milepost, engineering station, or by geographic feature, the number of girth welds made, the number nondestructively tested, the number rejected, and the disposition of the rejects.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-27, 41 FR 34606, Aug. 16, 1976; Amdt. 192-50, 50 FR 37192, Sept. 12, 1985; Amdt. 192-78, 61 FR 28784, June 6, 1996; Amdt. 192-120, 80 FR 12779, Mar. 11, 2015]

 

[brimmer]

What difference does it make which code you use whether the gas is flowing or not? If the question is will it make a difference or affect the results with RT, no it won't. Perhaps you want a specific RT procedure?

 

[LittleInch]

WAW,

It begs the questions as to how you're able to flow gas into a system which you're then testing. Testing usually needs to be undertaken before commissioning, not after.

what you're doing is unusual, so may not really be covered by the welding codes. At the end of the day it's about whether your inspection technique can detect any faults or issues with a weld.

Not that it's my area of expertise, but I'd always understood that the issue for pipes with flowing gas and especially liquid, was that it blurred the images. It may be for flowing gas it's not so much of an issue, but I think you need to do a few calibration tests first to ensure that you can get satisfactory film quality.

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

 

[SPDL310]

As LittleInch pointed out all welds should be inspected before gas is flowing through the system. I have done erosion and corrosion profile shots of valves and fittings on running systems before. That procedure usually involves placing a ball bearing of a known size on top of the object in question and placing a large sheet of film behind the equipment in question with the source a proper distance away. Two exposures are normally taken 90 degrees apart. I am not aware of the standards that govern this type of examination, but for an educated guess I would say API 597 or other fitness for service codes. Your NDE provider may know which code applies as well.