The chief engineer said that root valves must be installed on the equipment, and bypasses must be provided for control valves. Let’s discuss whether this is really necessary
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The chief engineer said that root valves must be installed on the equipment, and bypasses must be provided for control valves. Let’s discuss whether this is really necessary Is it explicitly required by the regulations?
Didn’t he say why? I think the root valve also needs to be installed. As for installing a bypass for the control valve, I’ve never heard of that; I’ve always installed control valves on the main pipeline
From a safety perspective, the current design concept includes providing bypasses for both accident shut-off valves and control valves, allowing for periodic disconnection of the automatic control valves to verify their functionality. Ensure her reliability. It mainly depends on the design institute
The chief engineer is referring to the normal situation; of course, you can also mention any exceptions if there are any. “There must be a bypass for control valves” – exceptions can certainly be cited.
It depends on the equipment and the level of risk; there’s no need for such complexity in the case of sinks. For liquid ammonia, dual valves are required, as well as valves specifically designed for ammonia – the requirements are higher in that case
In past design concepts, bypasses were basically installed on control valves. As the reliability of control systems improves, it is no longer necessary to equip all control valves with bypasses. If one looks at some newly built large-scale petrochemical plants, some control valves lack bypasses.
Installing a bypass for a control valve means that the main pipeline carrying the control valve should have a bypass……
The purpose of installing a bypass on the control valve is to facilitate maintenance
There must be a misunderstanding; what he meant is that the control valve must be equipped with a bypass (for maintenance purposes), and the control valve itself remains on the main pipeline.
It is generally designed this way: it is advisable to install a valve at the root, while a bypass for the automatic control valve is not necessarily required. If the control valve fails and your production process can be stopped at any time, then such a bypass may not be needed.