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HYDROSTATIC TESTINGHydrostatic testing by pressurizing vessels such as pipelines and gas cylinders, to both verify integrity and detect leaks. These tests involve filling the vessel or pipeline system with a liquid, usually water, which may be dyed to aid in visual leak detection. The vessel is then pressurized to a specific test pressure and monitored for any pressure loss. The location of a leak can be visually identified more easily if the test liquid contains a colorant. Overall vessel integ …

Gas purging is a process of displacing one gas by another gas. It occurs on a routine basis in the natural gas industry when pipelines are purged into and out of service. Purge gas is used to displace the contents of a container. To avoid flammable mixtures, the purge gas is usually inert except in certain instances where the relatively small area of contact allows the amount of flammable mixture to be minimized and controlled satisfactorily. The most common purge gases commercially …