Including the national technical standards for safety as follows:
+ TCVN 6156:1996: Pressure vessels - Safe technical requirements for installation, use, repair - method of testing.
+ TCVN 6292:1997: Gas cylinders - Gas cylinders made of welded steel which may be refilled... (p < 75 bar capacity from 1 to 150liters containing compressed gas, liquefied gas and dissolved gas at the ambient air temperature)
+ TCVN 6294-1997: Gas cylinders. Gas cylinders made of welded carbon steel – Inspection and periodical test. (Not applying to the cylinder containing Axetylen and LPG)
+ TCVN 6295-1997: Gas cylinders. Gas cylinders without welding – Safety standards and features (capacity from 0,5 liter to 150 liter, not limiting to pressure)
+ TCVN 6008-1995: Pressure equipment – Weld with technical requirement and method of inspection.
+ TCVN 7472-2005: Pressure equipment – joint weld.