In what situations are the following purging methods used?
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In what situations are the following purging methods used?
A represents normal purging. B is a purge to prevent the backflow of materials. C refers to pipelines through which flammable and explosive substances, or toxic media, are conveyed. Purge to prevent backflow at high pressure. The pipeline through which D is transported contains flammable and explosive substances, or toxic media
The medium pressure in the purged pipeline equipped with a check valve should be designed to be relatively high. Those with blind flanges are generally used only during startup and shutdown, while those without blind flanges but with check valves are often used in daily operations.
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a refers to oils with a higher specific gravity； b is a flammable, lightweight oil product ； c Liquefied gas and flammable gases ； d is a toxic gas.