Purpose of installing a shut-off valve in front of the fuel gas liquid separation tank
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Dear teachers: Clause 19.3 of the \"Code for Design of Process Piping in Refining Units\" (SH/T 3122-2013) stipulates that a liquid separation tank should be installed on the fuel pipeline prior to the burner of the heating furnace, and a shut-off valve should be placed at the inlet of this liquid separation tank. What is the purpose of adding a cut-off valve? Does a cut-off valve refer to a manual cut-off valve?
The main purpose of installing a liquid separation tank on the fuel pipeline in front of the burner in the heating furnace, along with a shut-off valve at the inlet of the liquid separation tank, is to ensure the safety and reliability of the fuel supply system. Firstly, the function of the liquid separation tank is primarily to separate and collect any liquid components that may be present in the fuel gas, preventing these liquids from entering the burner and causing unstable combustion or even damaging the burner. If liquid is mixed in the fuel gas, it will affect the combustion efficiency and quality. Secondly, the purpose of installing a shut-off valve is to enable rapid interruption of the fuel gas supply in case of maintenance or emergencies, thereby ensuring the safety of personnel and equipment. The emergency shut-off valve can be manually operated or automatic, depending on the design of the installation and its safety requirements. - Manual cut-off valve: It requires on-site operators to close it manually, and is suitable for certain less automated facilities or operating environments that demand human supervision. - Automatic shut-off valve: It can close automatically when abnormal conditions are detected (such as abnormal pressure, abnormal temperature, flame out, etc.), reducing reliance on the operator’s reaction time. Generally speaking, locations with high safety requirements tend to use automatic shut-off valves. The specific type of cut-off valve to be used must be determined based on the actual process and safety assessments of the equipment, as well as the company’s safety management regulations. .
Primarily for the needs of safe production, as an emergency shutdown mechanism in case of accidents. Valves in pneumatic actuators are usually controlled by solenoid valves. For reference.
Thank you. One more question: then why is a shut-off valve installed at the inlet of the liquid separation tank rather than at the outlet? Isn’t the outlet closer to the furnace?
Cut off as close as possible at the source of the fuel gas.