Piping hydrostatic test
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I would like to ask everyone: gas must be used for pipeline pressure testing. Which type of gas source is both safe and cost-effective?
Air (plant air or instrument air).
Generally, dry, oil-free nitrogen is used, with a purity of 99.999%.
Is it necessary to use nitrogen for pressure testing the pipelines in the cryogenic tank of an air separation unit? Can’t compressed air be used?
For general pipeline pressure testing, air compressors are sufficient and cost-effective. However, air compressors typically have a capacity of 4-6 kilograms. The disadvantages are that their electric heaters are of poor quality, which leads to an excess of water; in addition, they are often connected to many process pipelines, resulting in an abundance of impurities. Nitrogen can reach 8-10 kilograms.
It depends on the conditions under which your pipes are used; generally, water and air are used for pressure testing. If there are any special requirements, special handling will be applied; details can be found at http://www.docin.com/p-20609230.html
Reply to 6# liucy001: For pipelines carrying flammable and explosive media, it is recommended to use inert gas for pressure testing. . .
Dry, oil-free compressed air or nitrogen