radiography requirments for pipes.
radiography requirments for pipes.
(OP)
Hi there,
So I was just wondering what is the extent of radiography for process piping and piplines in a sour service environment?
I know that B31.3 classifies pipes according to fluid service (i.e. M, D, Normal etc.) but im still vague about the following.
1. Purely gas service process piping.
2. cross country pipelines (above vs underground).
I'd really appreciate it if someone can help shed some light on the above. Sorry for the trouble people :)
giermo
middleast.
So I was just wondering what is the extent of radiography for process piping and piplines in a sour service environment?
I know that B31.3 classifies pipes according to fluid service (i.e. M, D, Normal etc.) but im still vague about the following.
1. Purely gas service process piping.
2. cross country pipelines (above vs underground).
I'd really appreciate it if someone can help shed some light on the above. Sorry for the trouble people :)
giermo
middleast.





RE: radiography requirments for pipes.
2. Cross country pipelines (above vs underground). Cross country pipe Lines fall under ASME B31.4 or B31.8 depending on state of the commodity (Gas or Liquid)
RE: radiography requirments for pipes.
David
RE: radiography requirments for pipes.
Appreciate the prompt reply penn and zdas :)
So basically speaking i can find out my x ray extent for gaslines and pipelines from api 1104 right?
The thing is I've perused api 1104 for the above ground and underground radiography requirements but to no avail. Can you point me as to where i can find these in the subject code?? thanks again really:)
RE: radiography requirments for pipes.
Let your conscious be your guide ! But have a QA plan that sounds good if there is a problem.
RE: radiography requirments for pipes.
but its not so much the frequency of inspection that was inquiring about as the extent of radiography (i.e. 5 % of welds or 10 % of welds etc. )
In my case like you said all our pipes have to conform to MR 0175 due to sour service and we have:
1. Sour service pipe:100% welds radiographed inside an oil gathering facility and 25% outside the facility
2. For pipes with oil greater than 5% BS&W only 10% of welds are radiographed (inside and outside facility perimeter).
I just wanted to know whether those numbers were derived from a code or not :)
RE: radiography requirments for pipes.
Another consideration is where you/company RT 25% of the total number of welds : What is an acceptable rejection rate? For example if you RT 20 welds and 1 requires repair -no furthur action may be required. But : if you RT 20 welds and all fail , you will probably need to RT every weld made by that contractor. I mention this because I have had contractors say that the "company" could not RT any additional welds.
RE: radiography requirments for pipes.
B31.8 Paragraph 826.2
B31.4 Paragraph 434.8.5 generally has a 10% minimum requirement, but requires 100% of welds to be inspected
"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: radiography requirments for pipes.
API 1104 does't state anything in that regard
B31.3 states it according to fluid classification (i.e. category M 20% random radiography.
B31.8 like you said uses location categorization with location one being the most lenient since it is in sparsely populated area.
and B31.4 like you said is 10 % with 100% for the exceptions you listed above.
Thank you so much guys you've been very helpful :)
Thanks again big inch :>
BEST OF LUCK TO ALL :>
RE: radiography requirments for pipes.
RE: radiography requirments for pipes.
"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: radiography requirments for pipes.
thanks for all of u for your responce
regards
ACTUALLY I HAD TO NEED THIS INFO
REGARDS
jAM nAUMAN
mOODY iNTERNATIONAL