GAS MEETER INSTALL

Ultrasonicflow meters measure the difference in pulses transit time that travels from a downstream transducer to the upstream sensor, compared to the upstream transducer back to the downstream transducer. Unfortunately, because of the meter’s moving parts, its use is limited to clean dry gases only in gas applications, and pressure and temperature compensation are required. The meters have high turndown and accuracy.

Turbineflow meters measure volumetric flow based on fluid flowing past a free-spinning rotor, each revolution corresponding to a specific volume of gas or liquid. In a velocity meter type, the rate of the medium passing through the meter determines the measurement. They also provide excellent accuracy and repeatability and are easy to install. This flow measurement method depends only on the number of gas molecules and is independent of the gas pressure and temperature therefore, additional pressure and temperature equipment are unnecessary. The gas molecules create the heat transfer the greater the number of gas molecules in contact with the heated surface, the greater the heat transfer. Thermal mass flow meters measure the mass flow based on heat transfer from a heated element.

GAS MEETER INSTALL

They are also costly to purchase and install and unsuitable for larger pipe sizes. These meters are highly accurate with high turndown capabilities and are independent of fluid properties. Two types deserve mention here:Ĭoriolisflowmeters provide a direct mass flow measurement based upon the fluid’s deflection force moving through a vibrating tube. Mass flow meters determine mass flow passing through the meter. Direct Mass Flow Thermal Mass flow meters measure the mass flow based on heat transfer from a heated element (flare gas application with the Sage Paramount). This adjusted flow rate is often called STP (standard pressure and temperature) and is usually in units of SCFM (standard cubic feet per minute).įor this reason, most gas flow meters require pressure and temperature correction to convert the flow rate from operating conditions (ACFM) to standard conditions (SCFM). However, it is more important to adjust or correct the flow rate for a particular pressure and temperature. This flow rate is ACFM (actual cubic feet per minute). Most gas flow meters (differential pressure, turbine, positive displacement, vortex shedding) measure the gas flow at the actual operating conditions. Conversely, as the pressure increases, the gas molecules move closer together. As the temperature increases, the gas molecules move further apart. Since gas is compressible accurate gas flow measurement is difficult. In the market for a mass flow meter? Actual Flow vs Standard Flow

Other methods depend on the flowing stream’s forces as it overpowers a known constriction and indirectly calculates flow.

When measuring the rate of fluid over a known area, one can determine the flow.

Then, tally how many times the capacity fills to determine the flow.

Positive displacement meters collect a fixed fluid volume, then release and refill the gas or liquid.While there are four main meter styles for flow measurement, here are three characteristics to determine flow: What is a flow meter?Ī flow meter is a precision instrument that measures a pipe’s gas flow rate (or liquid flow).

They are mass flow meters, velocity flow meters, differential pressure, and PD meters. There are four natural gas meter types often used for flow measurement.