Do tank trucks have measures to prevent negative pressure?
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For tank trucks used to transport hazardous chemicals and flammable, explosive liquids, when unloading, if the manual valve of the vapor equilibrium pipe is forgotten to be opened, does the tank truck itself have any mechanism to prevent negative pressure?
Positive and negative pressure safety valves can be installed. Beyond the limit, the safety valve opens.
The negative pressure safety valve draws in air, which may reach the explosive limit; this represents a safety hazard. It is likely to be used rarely, and it can also contaminate the materials.
Our company is responsible for creating tables, conducting item-by-item checks and verifications, or installing flow meters on gas pipelines