How to choose a flow meter for LNG purification gas?

LNG purified gas is the gas obtained after dehydration, desulfurization, decarbonization, heavy hydrocarbon removal and dust removal of the original natural gas during the production of liquefied natural gas. Its main component is almost methane and only contains a very small amount of other hydrocarbons and Impurities. Ultimately, it needs to be cooled and liquefied safely and effectively, so the pressure-bearing capacity and temperature range of the flow meter must be tested.

In this context, Supmea flow engineers recommend the use of gas turbine flow meters and differential pressure flow meters based on many years of experience in the flow meter industry.

Gas turbine flowmeter:

• High accuracy: Because the measurement principle of turbine flow meters is directly related to the fluid velocity, its accuracy level is usually high and is suitable for Applications such as custody transfer and energy measurement that require strict accuracy.

• Applicability:Turbine flow meters are particularly suitable for natural gas purification that is clean and free of solid particles. Because of its precise internal structure, it is not suitable for media containing impurities or corrosive media.

Differential pressure flow meter:

• Orifice flowmeter: As a common form of differential pressure flowmeter, the orifice flowmeter generates pressure before and after measuring the throttling element. The pressure difference is used to calculate the flow rate. Although its accuracy may be slightly lower than that of the turbine flowmeter due to the pressure loss, it has good stability, simple maintenance, and can adapt to a wide flow range and different pipe diameters.

• V-cone flowmeter, velocity averaging tube (Verabar flowmeter): These are also differential pressure flowmeters. They have high accuracy within a certain Reynolds number range and are resistant to Wear, especially in the case of larger diameter pipes or dirty fluids.

  

Based on the above conditions, which model to choose, Shanghai Supmea engineers in practice. The choice of gas turbine flowmeter or differential pressure flowmeter will be decided based on the actual working conditions on site and the specific needs of the customer.