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421 views
00:16 Sep-03-2008

S.R.G.PRABHU

Consultant, AUT specialist
FREELANCE,
India,
Joined Aug 2008
63
Plant piping inspection as per API570

Our offshore platform started production on Dec 2005. We have class 1 piping as per API 570.The code says this class of piping shall be inspected every 5 years. Now, when shall the first 5 years inspection (thickness survey)start? We have some 590 numbers in this class and want to start the thickness survey rightnow, to finish by 2010, end of first five years...some one advise whether this is the right way of starting thickness survey as per API 570.


 
08:51 Sep-03-2008
Jim Yukes
Re: Plant piping inspection as per API570 API 570 provides guidance for inspection considerations for new piping systems. It basically requires an owner/user to define a probable corrosion rate of the piping systems to ensure inspection intervals do not surpass half-life calculations or maximum intervals based on risk of the piping systems. Maximum intervals should be considered as time from service date. Additionally, if a probable corrosion rate could not be determined, the initial thickness measurements should be made no later than 3 months after the service date.

References:
„X API 570, 7.1.2 ¡V Newly Installed Piping Systems or Changes in Service
„X API 570, 6.3 - Inspection Intervals


I would also recommend you consider RBI (Risk Based Inspection) assessments for the piping in question. This type assessment brings the probably or likelihood of failure into account when defining risk rather than the API classification which is focused predominantly on consequence. If you have designed the facility well and mitigated most common damage mechanisms the high risk items would most likely be less than currently defined. Additionally, I found an appropriate RBI assessment should define the most probabe damage mechanism to focus inspection on. Sometimes, it may not be thinning, etc.


----------- Start Original Message -----------
: Our offshore platform started production on Dec 2005. We have class 1 piping as per API 570.The code says this class of piping shall be inspected every 5 years. Now, when shall the first 5 years inspection (thickness survey)start? We have some 590 numbers in this class and want to start the thickness survey rightnow, to finish by 2010, end of first five years...some one advise whether this is the right way of starting thickness survey as per API 570.
------------ End Original Message ------------




 


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