5.1.For the cylinders containing normal gas: to chect overall every 5 years.
5.2.For the cylinders containing toxic, metal errosion gas (Chlorine, hydrogen sulphide, chloride Metin, Photden, Anhydric sulfur dioxide, hydrogen chloride .....): to check safety overall every 2 years.
5.3. When the manufacturer provides for a testing cycle shorter than the above mentioned testing cycle, the testing cycle of manufaturer shall be applied.
5.4.When shortening the testing cycle, the tester must state clearly the reason in the testing minute./.