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Re: [MW:34582] How to calculate Repair percentage

By Materials & Welding
It's client (End of User) requirements. For example Contactor shall deploy Welders with previous qualification records with proven performance of statistical repair rate less than 3% and continuity of Welding within 6 months. (Number of joints repair/Total Radiographed X 100)
Normally industry practices keep it with in 3% repair rate.

On Tue, 10 Oct 2023 at 11:42 AM, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:
The repair percentage for 100% RT Joints may be calculated by the below 3 methods as recommended in the Client Specification.

1. Joint Wise - Number of Joints Defective / Total Number of Joints Radiographed x 100
2. RT Film Wise - Number of Repair Films / Total Number of Films Radiographed x 100
3. Length Wise  - Length of Repair / Total Length Radiographed x 100

Acceptance Limits as per Client Specification.

Random RT depends on Applicable Code + Client specification.

Example of ASME B31.3 as below.



Penalty for defective Joints as per Applicable Client Specification.

Thanks & Regards

J.Gerald Jayakumar



On Monday, 9 October, 2023 at 12:24:52 pm IST, Karuppa Samy <samyqc08@gmail.com> wrote:


Dear experts,

how to calculate radiography repair percentage for 100% RT joints and random RT joints. please explain with applicable reference standard

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