Installation specifications for valves in the safety valve discharge pipeline
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First, check whether a valve can be installed in the discharge pipeline behind the safety valve (not the backflow valve of the safety valve); if a pneumatic on-off valve is installed, how can it be ensured to remain in the open position? Taking the pipelines in the tank area as an example, in previous designs, the discharge line of the safety valve was directly connected to the side of the tank base valve, leading straight into the tank. It is now connected in front of the tank root valve. So I want to know which standard should actually be followed?
According to the installation specifications for safety valve discharge pipes, here are some common rules: 1. Whether valves are allowed to be installed on the discharge pipe: Generally, valves are not permitted to be installed on the discharge pipe. This is because the valve may create resistance to the release process, affecting its efficiency and even leading to an increase in system pressure. Only in special circumstances, such as for the purpose of maintaining valves, conducting tests, or performing repairs, can temporary valves be installed, ensuring that they are opened before discharge. 2. Install pneumatic on-off valves to ensure an open state: If it is necessary to install pneumatic on-off valves to maintain an open condition, this can be achieved through the following measures: – Choose solenoid valves or manual valves, which can remain open in the event of a power outage or other abnormalities. - When installing pneumatic on-off valves, normally open valves should be preferred, as this ensures they remain open even when the air supply is interrupted. 3. Location of the discharge pipeline interface: Regarding the location of the interface for the discharge pipeline of the safety valves in the pipeline network of the tank farm, which specific scheme to adopt shall be determined in accordance with relevant design specifications and safety requirements. In the piping design of tank areas, a common practice is to connect the discharge line of the safety valve directly to the side of the tank bottom valve, leading directly into the tank. But now there are also some new designs that connect the discharge line in front of the tank bottom valve; this is likely done to better control and regulate parameters such as flow rate or pressure during the discharge process. To determine which specific plan to implement, it is necessary to refer to the relevant local regulations and standards, and make judgments and decisions based on the actual circumstances. In summary, when installing the relief valve discharge piping, relevant design specifications and safety requirements must be followed to ensure the safety and reliability of the discharge process. If you have doubts about specific situations, it is recommended to consult a professional engineer or the relevant department for detailed guidance. .
. . The explanation provided earlier was excellent. I have one question: the shut-off valves located in front of the storage tanks are all pneumatic valves that do not have any regulating function; they cannot control the flow rate or pressure during the discharge process. :victory: