Inspection Methods For HF Modified Pipe
Inspection Methods For HF Modified Pipe
(OP)
Good day,
We have a fair amount of HF modified pipe in our facility and are currently in the midst of revamp work where tie-ins and pipe rework is required. Prior to cutting pipe, the project management contractor is requiring a thickness reading to ensure adequate material is present for welding. In the past we have done ultrasonic thickness readings on the lines but have quit this practise because we feel the results are questionable due to the grain size of HF material. The pipe ranges from 4.00" to 14.00" and sch 40 to 160.
I am wondering what inspection methods others are using for corrosion monitoring and weld inspections.
Thank you in advance.
We have a fair amount of HF modified pipe in our facility and are currently in the midst of revamp work where tie-ins and pipe rework is required. Prior to cutting pipe, the project management contractor is requiring a thickness reading to ensure adequate material is present for welding. In the past we have done ultrasonic thickness readings on the lines but have quit this practise because we feel the results are questionable due to the grain size of HF material. The pipe ranges from 4.00" to 14.00" and sch 40 to 160.
I am wondering what inspection methods others are using for corrosion monitoring and weld inspections.
Thank you in advance.





RE: Inspection Methods For HF Modified Pipe
Another question that arises is the metallurgical condition of the pipes; there might be weldability concerns there.
RE: Inspection Methods For HF Modified Pipe
RE: Inspection Methods For HF Modified Pipe
I've talked to a level III and two experience level II's all said there should be not be a problem with UT if the proper gauge block is used. There might be some attenuation but neither said that would prevent getting a good thickness reading.
I'm a little curious as to the physical measurements of the pipe in question.
If as you post it is large and heavy wall you might want to contact Duraloy or Kubota about the lead time for same.
http://www.duraloy.com/
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RE: Inspection Methods For HF Modified Pipe
Due to the potentially large grain size, have you tried a large diameter (24mm/1")low frequency (1 to 2 MHz) probe?
The 4" sch 40 (6mm wall) will need a twin-crystal, but the 14" Sch 160 (35mm) will be better measured with a single crystal
For corrosion monitoring, UT is the most widely available and flexible option, from manual data loggers to fully-automated C-scan colour imaging systems. The equipment manufacturers will sort out your specific problems.
For weld inspection focussing on the root in particular , I would recommend trialling ToFD for wall thickness 8mm and more. You can get an idea of the general corrosion condition of the ID simultaneously. Approach an experienced ToFD service-provider.
Like all things you pays your money, you takes your choice.