This publication defines test equipment and procedures that are applicable for testing DOT and TC acetylene cylinders having a marked service pressure of 250 psi (1723 kPa).These four tests in 5.1 through 5.4 are required to be conducted when there is a new cylinder design or a design change in the filler or a change in process. These tests shall be conducted before starting quantity production and introduction of a specific cylinder model into service. Cylinders shall pass all tests.Cylinders to be tested shall be selected from a pilot production run of cylinders to permit the use of planned production equipment and procedures. Cylinders to be tested shall be of those produced in an actual production operation.Test cylinders are to be complete and of a quality for service including shell, filler, solvent, valve, core hole packing, PRDs, and painting. Cylinders used in any of these tests shall be scrapped.