What is ISO 11117 - Gas cylinders about?
ISO 11117 is a series on gas cylinders. A gas cylinder is a pressure vessel for the storage and containment of gases at above atmospheric pressure. ISO 11117 specifies the requirements for valve protection caps and valve guards used on cylinders for liquefied, dissolved, or compressed gases. Valve protection caps and valve guards are some of the options available to protect cylinder valves, including valves with integral pressure regulators (VIPRs) during transport.
ISO 11117 is applicable to valve protection caps and valve guards which inherently provide the primary protection of a cylinder valve. ISO 11117 can also be used to test other equipment (e.g., handling devices) attached to cylinder packages, even in cases where the cylinder valve is inherently able to withstand damage without the release of the content.
Note 1: ISO 11117 excludes protection devices for cylinders with a water capacity of 5 l or less and cylinders whereby the protection device is fixed by means of lugs welded or brazed to the cylinder or is welded or brazed directly to the cylinder.
Note 2: ISO 11117 does not cover valve protection for breathing apparatus cylinders.
Note 3: ISO 11117 does not specify requirements that could be necessary to enable the valve protection device to be used for lifting the cylinder.
Who is ISO 11117 - Gas cylinders for?
ISO 11117 on gas cylinders is useful for:
- Gas cylinder manufacturers
- Transport facilities for LPG
- Design engineers
- Quality control personnel
- Research and development facilities
Why should you use ISO 11117 - Gas cylinders?
Inside the cylinder the stored contents may be in a state of compressed gas, vapour over liquid, supercritical fluid, or dissolved in a substrate material, depending on the physical characteristics of the contents. 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. ISO 11117 covers devices intended for the protection of cylinder valves, where such protection is fitted to allow safe transport, handling, and storage. ISO 11117 specifies the principal dimensions, requirements for fitment and drop test procedure, to confirm the provision of adequate valve protection, in the event of the occurrence of a cylinder toppling from its base.
A valve protection cap is capable of being securely fixed to the cylinder, either by screwed thread or other suitable means. The valve protection cap is provided with sufficient venting capacity equating to a cross-sectional area of at least 157 mm2 for a typical conventional cylinder valve. Possible examples of valve protection caps are using two or more vent holes of at least 10 mm diameter situated symmetrically so that any thrust caused by venting gas is balanced, and using other means of venting, e.g., lifting under pressure. Using ISO 11117 you can specify the requirements for valve protection caps and valve guards used on cylinders for liquefied, dissolved, or compressed gases.
What’s changed since the last update?
BS EN ISO 11117:2019 supersedes BS EN ISO 11117:2008. BS EN ISO 11117:2019 includes some technical changes with respect to BS EN ISO 11117:2008. These include:
- Clarification of requirements for "ISO P A" marking
- Removal of Figure 2
- Substitution of Figure 1 by Figure 1 a) and b), and Figure 3 a) and b)
- Addition of other threads than W 80 × 1/11
- Renaming and modification of the "axial test" as "vertical pull test"
