Is it necessary to add a bypass line for the control valve? What is used to make the judgment?
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Is it necessary to add a bypass line for the control valve? What is used to make the judgment?
No, depending on the process conditions and the medium involved, if a bypass is not allowed, or if it is a high-hazard medium, then no bypass is provided for the control valve. For example, the cold hydrogen valve in the hydrogenation unit is absent, and there is no bypass for the gas control valve either
What about, for example, a 12-inch low-pressure steam pipeline?
The key here is to determine it based on the requirements of the gas supply unit at the back; for example, a gas stove’s valve does not require a bypass. If continuous air supply is required at the rear, and the control valve fails, it is necessary to immediately use a bypass to maintain the air supply, and shut off the stop valves before and after the control valve for maintenance. Some are also used to assist control valves in regulating flow, and the key factor is whether your process requires it. If you think it’s too much, it’s best to share the process; this will make it easier to explain things visually and serve as a reference.
There’s no fixed standard for this, right? In foreign designs, many bypasses are removed; we’ll put forward a request in this regard
If it’s a technical agreement and what is cut out is indeed related to investment, then the process really needs to be analyzed carefully. But in many cases, the prices of the equipment have already been fixed, and the reductions you achieve often don’t result in a lower overall price. So it still needs to be carefully considered. For reference.
If it can be ensured that the control valve will never break down, it can be omitted