Can the weight-loaded valve of an LNG storage tank be used as a standalone outlet shut-off valve?
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It’s a 5,000-cubic-meter single-volume tank; no emergency shut-off valve is installed at the outlet to the pump. Both low liquid level and low pressure conditions trigger the closure of the heavy-duty valve. Those who understand this situation could please provide an explanation, and it would be great if relevant standard numbers could also be given. Thank you very much
A weight-loaded valve is a safety device commonly used at the bottom of LNG storage tanks; it closes in response to changes in liquid level or pressure, thereby preventing the tank from experiencing overpressure or excessive liquid levels. Hammer valves are usually not the main valves used to shut off fluid flow, but rather serve as safety auxiliary devices. In accordance with the relevant industry standards, namely GB/T 3785-2008 \"Liquefied Petroleum Gas (LPG) – Vehicles, Storage Tanks and Portable Cylinders\" and GB50156-2012 \"Code for Construction and Acceptance of Petrochemical Enterprises\", LNG storage tanks should be equipped with emergency shut-off valves at their outlets, which should be connected to level or pressure sensors in order to enable automatic shutdown. Therefore, under normal circumstances, the weight-operated valve cannot be used alone as a shut-off valve at the outlet. It is recommended that you install an emergency shut-off valve as soon as possible to ensure the safe operation of the storage tank. At the same time, you can consult the industry standards and specifications related to LNG storage tanks to gain a better understanding of the requirements for safe operation. .
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