Piping Repair Rates

By Benjie Santos Date 06-08-2004 08:00

Piping fabrication repair rates are usually calculated and used as benchmarks for quality. The two most commonly used rates are the "butt rate" (butts repaired vs. butt tested) and "linear rate" (length repaired vs. length tested).
Is there any industry standard repair rates for piping for both "butt rate" and "linear rate" for carbon steel, stainless steel, duplex stainless steel, inconel, and CuNi materials?

By Bill A

Date 06-10-2004 19:14

for butt welding long steel pipelines using SMAW we figure <1% repair rate (based on # of welds) is great, >3% is not good, except perhaps in the startup phase of field production welding. Sorry, I have no data on alloys.

By Jim Hughes (***)

Date 06-14-2004 23:12

WHAT!!!! LOOK, ANTHING BELOW 5% IS THE INDUSTRY STANDARD. YAH LESS THAN 3% WOULD BE GREAT BUT IT WOULD GREATLY DEPEND ON WHAT CODE YOUR SHOOTING TO. API1104 3% OR LESS IS POSSIBLE. (JUST LOOK AT THE CODE ALMOST ANYTHING GOES) ASME SEC. 1 A LITTLE TOUGHER. 3 TO 5 % IS GOOD. ASME B31.3 SEVERE CYCLIC ON SCH 10 316L S.S IF YOU CAN MAKE 5% REJECT RATE YOUR DOING GREAT.