How to calculate Repair percentage

[Karuppa Samy]

Dear experts,

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

[Babur Khan]

Greetings

Below here is repair rate farmula 

% RR = (Lr/ Lw) X 100

where:

% RR = percent repair rate.

Lr = welder's total length of repairs in one week, mm

Lw = welder's total length of weld radiographed in one week, mm

Muhammad Babur Khan

Sent from my iPhone

On 9 Oct 2023, at 9:54 AM, Karuppa Samy <samy...@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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[james gerald]

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 <samy...@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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[DOMINIC V.K]

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.

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