Regarding the installation of wall valves in tower systems
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Gentlemen, regarding the installation of wall valves in towers, it seems that different plants have different design concepts; catalytic units generally come equipped with wall valves； For hydrogenation, it generally refers to the inlet and outlet pressure blind flanges. As I understand it, installing wall valves also facilitates maintenance, and it allows the steam tower to be started up without steam scattering everywhere. Installing blind flanges is primarily intended to provide complete isolation when personnel enter the tower, preventing leaks and ensuring the safety of maintenance workers. Some devices don’t have anything set at all. I think the only downside of using a wall-mounted valve is that for the material pumped from upstream, the closing pressure has to be taken into account in front of this valve, which results in an increase in the pipeline rating. Are there any unified requirements or standards for the installation of wall valves?
That is, a valve should be added at the connection point between the tower nozzle and the pipeline
What does it mean by the cut-off valve of the equipment? ? ?
Generally, isolation blind plates are installed on high-pressure equipment, while wall valves are used on low-pressure equipment. This is primarily for safety reasons: since high-pressure equipment generates high levels of energy during normal operation, the absence of valves helps prevent accidental operation of those valves from causing pressure buildup in the system, which could lead to explosions in severe cases. Low-pressure equipment poses a lower level of risk, which is why wall valves are used in such cases.