Dear colleagues and experts in the natural gas industry, I have a question to ask
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I work in the heating furnace industry; recently, due to policies encouraging the switch from coal to gas, many steel mills have been building gas stations for this purpose. When using natural gas as fuel, I wonder how the properties of the natural gas change before and after the pressure regulator at our gas station. I asked the personnel responsible for installing the regulator, and he said that the flow rate remains unchanged; however, based on the law of conservation, this seems incorrect. I would appreciate advice from professional technicians. By the way, what are the flow rates corresponding to different pressures in our gas pipelines?
Is there no one? This section isn’t active
The simplest formula is: flow rate = velocity multiplied by cross-sectional area. Flow rate is related to pressure, and to cross-sectional area and pipe diameter.
What are the flow rates corresponding to different pressures?
Low-pressure pipelines generally have a flow rate of 5-6 meters per second, while medium-pressure pipelines have a flow rate of around 10-15 meters per second; in general, it is below 15 meters per second
The Chemical Process Design Manual provides a range for the optimal flow velocity of compressed gases in the sections on pipeline fluid dynamics calculations and adiabatic design. 5# refers to composite requirements.
Thank you for your reply, but do you know anything about the issue with the pressure regulating valve?
Isn’t a pressure regulating valve just a control valve? Just select the appropriate one based on the operating conditions. Didn’t you hire a design firm for the renovation? These details will be reflected in the design, and then one can simply choose the appropriate option. If you don’t know how to choose, ask the design institute for a recommendation
We don’t have a design institute; we are a private company. The pressure regulating valves are the responsibility of the client, and we only inform them of the pressure and flow rates we use
If it is the gas supplier who is responsible for the construction, you can ask them for the relevant documents. Such as valve parameters, flow meter parameters, control parameters, etc. First, you need to know what the pressure of the main natural gas pipeline entering the building is, and then adjust it to the pressure required for your operational conditions. If the pressure drop is high, then a high-pressure differential valve or multiple stages of pressure reduction are required. It mainly depends on the pressure.