High-pressure reaction feed pump minimum flow line bypass
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Why is a bypass line also provided for the flow rate control valve of the reaction feed pump in the hydrogenation unit? This pipe appears to be DN50 by visual inspection. The minimum flow linear angle valve is equipped with a hydraulic actuator, allowing for manual operation through external control. What is the function of this DN50 control valve bypass line?
This branch line is the one for the minimum flow control valve; it should be equipped with a flow-limiting orifice plate, which can be used when the control valve is not functioning properly. We also think it’s unnecessary; it’s an extra step.
This bypass line is the bypass line for the minimum flow control valve; it is equipped with a flow-limiting orifice plate, and is used for control when the main control valve is not functioning properly. It is mainly for the purpose of ensuring equipment safety; if the minimum flow control valve cannot be opened when starting the pump, and there is no bypass line, it is not advisable to start the pump, as this could easily lead to pressure buildup in the pump.
The control valve itself is equipped with a hydraulic actuator, allowing external operation to manually control its opening and closing. Furthermore, if the minimum flow rate control valve cannot be opened, it is impossible to achieve the pump’s minimum flow rate with such a thin stream, especially since there is also a flow restriction orifice plate in place. So I am skeptical of this claim.
The main consideration is to cut off the flow for maintenance in case there are problems with the valve.
This is even less possible. 1. Valve maintenance can be carried out after switching to the backup pump. It’s impossible to keep the pump running while servicing this valve alone. 2. As mentioned earlier, this pipe is too small and cannot meet the pump’s minimum flow requirement. 3. If this valve is removed, it will also remove this small branch line along with it.
It ensures that oil keeps flowing through this pipeline, in a quantity that isn’t too large, which helps to prevent freezing and condensation
To prevent it from failing and not being able to operate, double safety measures~~~ The auxiliary lines usually have orifice plates, as well as those at the feed pump ~~~
The so-called auxiliary line is technically known as a \"bypass line.\" It is used in pumps with low flow rates but high head pressure, to prevent excessive pressure from being applied to the outlet valve, which could make it difficult to open. Forcing the valve to open might risk damaging the valve stem or the seat. Installing a bypass line with a flow-limiting orifice can facilitate opening. At the same time, the bypass line also helps to reduce pipeline vibration and noise (for example, by introducing medium into the boundary zone, turning the valve a few degrees, and waiting a while; the principle is the same as that used to impact the pipelines downstream). The device I’m working with is used for catalytic cracking. Additionally, it seems that this design is only used by SEI, not by Luoyang Institute.
Special section on safety: take a close look; pay attention to pipeline design and valve design in petrochemical engineering
Special section on safety: take a close look; pay attention to pipeline design and valve design in petrochemical engineering