API Threads Tensile Strength

I'm guessing here but assume these definitions....

API= American Petroleum Institute

LTC= long round thread casing

BTC= buttress thread casing

The yield strength is defined by API as the tensile stress required to produce a total elongation per unit length of 0.005 on a standard test specimen...This is going to vary according to pipe grade, typically yield strength is going to run between 40k to 180k psi...Threaded connections are often rated according to their joint efficiency, which is the tensile strength of the joint divided by the tensile strength of the pipe body..The efficiency is determined by the shape of the threads and other characteristics, the round threads being, er, a, rounder and the buttress threads being more squared are usually rated near 100%...Now, what was the question again? So if the threads are not 100% then ya gotta deduct from yield strength...

Thanks for the answer.

my question now is, what is the efficiency of the LTC and BTC connections on % of the PBYS.

thanks!!

It is determined by carrying out a hydraulic test of the installation in front of the Engineer/Surveyor for the company that issues burst indemnity insurance cover.