Pressure relief valve from high pressure to low pressure
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Should two sets of pressure relief valves, one for high pressure and one for low pressure, be installed in parallel for hydrogenation?
There are two groups; one of them is relatively safe, I guess
To prevent the valve from sticking or experiencing unstable adjustment, another set can be used for adjustment in such situations
Moreover, there are double valves in front of each control valve; these control valves are operated using step control, and there is no mention of switching between the two valves
One in use and one as backup to prevent problems that could lead to high liquid levels preventing drainage and resulting in shutdowns
It’s the auxiliary line of the hydraulic control valve; in early designs, there was a single hydraulic control valve, while the auxiliary lines used two valves along with flow-limiting orifice plates
It depends on the frequency of use; for example, from high-temperature and high-pressure to low-temperature and low-pressure, oil and water go to the low-temperature and acidic water tanks. There are two pressure relief valves for this purpose, one primary and one backup； There is only one pressure reducing valve from the hydrogen circulation machine inlet separator tank to the cold low-pressure separator.
May I ask if the flow control orifice plate is single-stage or multi-stage?
What I have seen is a single-stage design, with the aperture determined by the minimum flow rate that can be processed by the device
This setting is quite reasonable; it allows for production at a minimum level of load
For us, the high-level and interface levels are both in two sets!