Piping non-destructive testing
Thread Content
Which non-destructive testing method is most suitable for carbon steel pipes with a wall thickness of 34 mm?
Ultrasonic testing is generally used; merely knowing the wall thickness is not sufficient – it is necessary to consider the ratio of the steel pipe’s wall thickness to its outer diameter. A value of less than 0.2 is considered suitable
Have an institution qualified for non-destructive testing of pressure pipelines conduct the inspection, issue a test report, and apply for a permit for the use of the pressure pipeline
It’s obviously ultrasound, but there’s always concern that its effectiveness might be poor, as the regulations don’t specify clearly. From a safety perspective, I personally think using a gamma source is the best option.
The radiation source RT will work; just make sure to control the exposure time properly
It’s a carbon steel pipe with a wall thickness of 34 mm; the exact material isn’t known, nor is its nominal diameter. It’s used at what temperatures and pressures, and with what fluids? Let’s take a look!
It’s not complete enough. For non-destructive testing, long bars and large pipes (with an outer diameter of over 200) are generally tested using ultrasound, while small pipes (with an outer diameter of under 200) are usually inspected using eddy current testing. These requirements are stipulated by the General Administration for Quality Supervision, Inspection and Quarantine. Therefore, the special equipment manufacturing license for pressure pipelines is classified as TSA1: seamless steel pipes are used for structures with an outer diameter of under 200, as well as for fluid transportation purposes； TSA2: Seamless steel tubes for high-pressure boilers with an outer diameter of 200 mm or less ； TSB: Seamless steel pipes for structures with an outer diameter of 200 mm or more, and seamless steel pipes for fluids.
It is best to perform UT; RT is also acceptable