A drain is provided in the gas phase tube
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What type of vapor lines require a drain line? What are the specific conditions?
Gas pipelines that are prone to entrapping liquids or generating condensed liquids require a drain at the lower part of the pipeline.
Gas pipelines that are prone to carrying liquid or forming condensed liquid require a drain at the lower part of the pipeline
Drainage devices should be installed on gas pipes that are prone to entrapping liquids, have a low freezing point, and may condense under operating or non-operating conditions.