All the machinery are calibrated and certified to guarantee consistency. Quality Control officers inspect the process and also perform batch sample tests in the lab on raw material. Sample cylinders are produced and tested as well to ensure consistency and quality based on specifications of the client and standards, before proceeding to production.
In total, there are 18 tests performed, divided into two categories:
Before using the steel material, while the fatigue life of the cylinder and its failures, accidents, and costs, destructive tests are an excellent way to test the material performance of Sigma’s products. Through Burst Tests, for example, safety is proved by pressurizing LPG cylinders until they fail. The higher the threshold, the safer the cylinders. Of course, before using sheet material, it is periodically tested, both mechanically and chemically, while the fatigue life and its failure locations are verified through the Design Test.
Non-destructive tests include coating tests to determine if the zinc and paint will adhere properly through radiographic examination, salt spray, and scratch tests to reinsure weld and coating imperfections.