The function of the safety valve between the inlet and outlet pipes of the storage tank
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As shown in the picture, a safety valve is installed between the feed pipe and the discharge pipe of the ethanol storage tank on the inner floating roof. What is the function of this safety valve? What is the normative basis?
Prevent the pressure inside the tank from being held up, especially when the outdoor storage tank is heated (due to sunlight, etc.), causing the internal pressure to rise. When the warning pressure is reached, it will automatically release pressure and exhaust to prevent the tank from deforming.
1. It is mainly used to release the pressure caused by the evaporation of the residual liquid in the pipeline due to heat. Because the evaporation of ethanol is large, it protects the pipeline and valves. 2. When the storage tank is in a crisis state, the storage tank drains the liquid and discharges it to a safe area through the safety valve bypass.
Looking at the picture, there are valves at the inlet and outlet of the safety valve, and the discharge port does not discharge to the atmosphere. It should be that after the solenoid valve at the inlet and outlet of the storage tank is closed, it prevents overpressure in the pipeline and plays a role in balancing the inlet and outlet pressures.
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in accordance with: "Fire Protection Standards for Engineering Design of Petrochemical Enterprises (2018 Edition)" (GB 50160-2008) Article 5.5.6 For liquefied hydrocarbon and Class A B and B A liquid pipelines where the valves at both ends are closed and the medium pressure may increase due to external influences, pressure relief safety measures should be taken.