How to prevent a vacuum from forming during drainage
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Gentlemen, after a hydraulic test of containers or pipelines, how can we prevent the formation of a vacuum during the drainage process?
Open the flange blind plate on top of the container.
To control the drainage speed, an air inlet/valve is required
The simplest way is to turn it on and open it.
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Reply to 7# lushuangjin: It is a pipe connected to the atmosphere and installed at the top of the container or at the highest point of the pipeline.
After the pressure testing is completed, the valve can be opened slightly to allow fluid to flow out, in order to prevent the equipment from being subjected to excessive external pressure if the release is too rapid; thereafter, the top vent valve can be opened. Special attention should be paid to the equipment or pipelines used for pressure testing. Personal opinion