What is ISO/TR 11364 - Gas cylinders about?
ISO/TR 11364 discusses gas cylinders. A gas cylinder is a pressure vessel for the storage and containment of gases at above atmospheric pressure. ISO/TR 11364 lists the different valve stem to gas cylinder connection threads currently and historically existing worldwide and provides official coded designations for them. These coded designations will then be available for identification and marking purposes. ISO/TR 11364 also gives guidance concerning which threads are dimensionally identical and which are interchangeable. ISO/TR 11364 provides guidance for valving procedures when fitting valves to gas cylinders.
Who is ISO/TR 11364 - Gas cylinders for?
ISO/TR 11364 on gas cylinders is useful for:
- Gas cylinder manufacturers
- Gas cylinder valve manufacturers
- Design engineers
- Quality control personnel
Why should you use ISO/TR 11364 - Gas cylinders?
A typical gas cylinder design is elongated, standing upright on a flattened bottom end, with the valve and fitting at the top for connecting to the receiving apparatus. There is a huge variety of valve to gas cylinder neck thread connections worldwide and cylinders are free to be equipped with any thread according to a recognized thread standard. ISO standards for cylinders and valves require the marking of an identification of the thread on valve and cylinder but there is presently no harmonized marking system.
The purpose of ISO/TR 11364 is to list all known cylinder/valve threads currently used and also threads used in the past and to specify a harmonized identification code and marking system for both cylinders and valves. The aim is to reduce the risk of mismatches when valves are fitted to gas cylinders and avoid related safety incidents. 25E valve with T8, T23 and T26 cylinder threads can be safely used in service, However, for small steel (less than 5 l water capacity) and aluminium alloy cylinders, you should examine the suitability of the resulting combination for each application in order for them to be interchangeable. Using ISO/TR 11364 you can list the different valve stem to gas cylinder connection threads currently and historically existing worldwide and provide official coded designations for them.
What’s changed since the last update?
PD ISO/TR 11364:2019 supersedes PD ISO/TR 11364:2012. PD ISO/TR 11364:2019 includes some technical changes with respect to PD ISO/TR 11364:2012. These include:
- Tables 1 to 17 have been corrected
- Tables for Denmark threads, Indian threads and USA threads have been introduced