- 1. Do the compressed gas cylinders used by Linde have any manufacturing or regulatory standards that they must meet?
Compressed gas cylinders are considered pressure vessels, and therefore governed by local authority rules and regulations. High pressure cylinders are subject to visual examinations before every fill, and are required to undergo documented pressure testing, either hydrostatically or ultrasonically every few years.
Cylinders used by Linde conform to the regulations of the governing authority for the country in which they are to be transported.
- 2. What is a dual port valve, and where would it be used?
A dual port valve has two outlet connections which allow the user to remove cylinder contents in either liquid, or vapour phase. The liquid connection utilizes a liquid withdrawal tube. The vapour connection is used to remove product in vapour phase from the head space near the top of the cylinder.
Dual port valves may be used with liquefied pure products such as 1,3 Butadiene, Propane, or various refrigerants. Dual port valves are also used with liquefied hydrocarbon blends to maintain pressure consistency during use.
- 3. Is a protective cap mandatory on the cylinder valve to protect threads and the valve assembly in case the cylinder falls?
- There are national regulations that prescribe a required degree of valve protection. For some containers, this means a valve cap. Linde follows the regulations of the governing authority for the country in which they are to be transported.