Non destructive testing selection for different damage mechanisms
Non destructive testing selection for different damage mechanisms
(OP)
Hello all,
I work as an inspection engineer on a very large LNG facility where a risk based inspection exercise has been partially completed. We have circuitized the facility, identified the damage mechanisms and determined inspection intervals. Unfortunately the writing of inspection workscopes and placement of CML's was bypassed and now we are 2-years into operation with only single line work orders in a CMMS to instruct us that an inspection is due.
I am severely resource constrained but have now been granted approval to hire some inspection engineers to execute the workscoping activities. For consistency I want to develop a procedure which outlines the NDT techniques that should be specified for different damage mechanisms identified in the RBI. For example, bottom of line CO2 corrosion use a UT scan or profile RT depending on the pipe diameter.
I have seen basic guidance in API 577 on NDT detection technique for weld defects and there is some low level guidance in the book Practical Non-destructive testing but nothing solid that I would reference in my procedure.
Basically I need a guide which lists the potential damage mechanisms in O&G and gives the suitable NDT technique
E.g.
CO2 BOL
CO2 TOL
Chloride SCC (SS)
Chloride Pitting (SS)
Deaerator Cracking
HIC
H2S
etc..
I work as an inspection engineer on a very large LNG facility where a risk based inspection exercise has been partially completed. We have circuitized the facility, identified the damage mechanisms and determined inspection intervals. Unfortunately the writing of inspection workscopes and placement of CML's was bypassed and now we are 2-years into operation with only single line work orders in a CMMS to instruct us that an inspection is due.
I am severely resource constrained but have now been granted approval to hire some inspection engineers to execute the workscoping activities. For consistency I want to develop a procedure which outlines the NDT techniques that should be specified for different damage mechanisms identified in the RBI. For example, bottom of line CO2 corrosion use a UT scan or profile RT depending on the pipe diameter.
I have seen basic guidance in API 577 on NDT detection technique for weld defects and there is some low level guidance in the book Practical Non-destructive testing but nothing solid that I would reference in my procedure.
Basically I need a guide which lists the potential damage mechanisms in O&G and gives the suitable NDT technique
E.g.
CO2 BOL
CO2 TOL
Chloride SCC (SS)
Chloride Pitting (SS)
Deaerator Cracking
HIC
H2S
etc..





RE: Non destructive testing selection for different damage mechanisms
Since many will be size and alloy dependent you are going to have a large matrix to work through.
I have read an ASME document that rates NDT methods vs indication types, I'll look for it for you.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: Non destructive testing selection for different damage mechanisms
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Non destructive testing selection for different damage mechanisms
@SJones thanks also for your reply, im aware of API 571 and could use it for building a document from scratch, along with several other documents that are out there, but it doesn't summarise NDT/damage which im after to save time. The linked document requires an energy institute account which I don't have unfortunately. I have seen the DNC document before, it is very nice, particularly table A-1 and A-2 which I will use.
Any other ideas please let me know... a good high quality document like the one im planning takes a solid 1-2 months to complete so any summarised info I can use will help to reduce this
RE: Non destructive testing selection for different damage mechanisms
Gives you tables listing (for instance)
ClSCC
Inspection Category~~~~~~Intrusive~~~~~~~~~~~~~~~~~Non-Intrusive
Highly effective:~~~~~~~~100% PT w/ UT follow-up~~~~~~N/A
Usually effective:~~~~~~~65% PT w/ UT follow-up~~~~~~~100% AUT OR ...
...
...
...
Similar tables exist for many damage mechanisms and damage morphologies. Should be a good jumping off point.
Nathan Brink
RE: Non destructive testing selection for different damage mechanisms
1. Have you seen API 574 for piping?
2. Can you outline the Corrosion loops/circuits that were developed during the RBI studies? or You can email me austine.isodje@gmail.com for further discussions.
RE: Non destructive testing selection for different damage mechanisms
API510,API570,API653,API577,API571,
API580, NBIC AI. A.S. Eng, BSME
RE: Non destructive testing selection for different damage mechanisms
RE: Non destructive testing selection for different damage mechanisms
ASTM has tried to automate the process of determining/monitoring stress-critical areas in boilers and piping systems…
Introducing easy and seamless online access to critical stress tables in Section II, Part D of ASME Boiler and Pressure Vessel Code.
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Traditionally engineers have relied on hard copies of the Code, referencing the stress tables spread across hundreds of pages within the voluminous Section II-D. However, using the paper-based tables is tedious, time-consuming and fraught with the potential for transcription errors or misread figures –creating additional costs and risks for companies that rely on the Boiler Code.
Now engineers have a fast, easy way to access this essential resource through the ASME BPVC Electronic Stress Tables powered by IHS.
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Regards, Wil Taylor
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