Proof Rings

The Proof Ring test system is the most widely used equipment for evaluating sulfide stress cracking and stress corrosion cracking behaviors of materials. The compact size, accuracy, and ease of use provides an economical means for testing multiple specimens simultaneously in a fume hood. Cortest Proof Rings were our original product in 1977 – they meet the testing requirements of NACE TM 0177 test method which is used to determine materials that meet the NACE material requirement of MR 0175.

Proof Rings are precision machined from a single piece of alloy steel, and are then individually tested to obtain the relationship between load and ring deflection. Each ring is supplied with a unique test report, and is accurate to within 1% at full load. From ambient conditions to high pressure and high temperature, multiple types of vessels can be used with these proof rings to fulfill the requirements of even the most demanding application.