product overview

The metering system is a skid mounted metering system (device) used for trade handover in natural gas long-distance pipeline distribution stations. It integrates functions such as filtration, metering, gas composition analysis, flow comparison, online calibration, system venting, and automatic switching. According to different working conditions and requirements, it can be divided into turbine metering system, ultrasonic metering system, mass metering system, orifice metering system, volumetric metering system, etc.

The metering system generally consists of several subsystems, including filtration system, metering system, flow comparison system, gas chromatography analysis system, online calibration system, venting system, gas leakage alarm system, etc. Using a straight pipe section that meets the requirements and equipped with a flow computer for gas temperature and pressure compensation for flow calculation, the gas composition signal is detected by an online gas chromatography analyzer. Flow comparison is the process of connecting two or more flow meters in series to achieve the purpose of comparison, while online calibration systems reserve online calibration ports on the system according to process requirements. In principle, the venting system adopts centralized venting, while the gas leakage alarm system can be interlocked with the main valve and venting system. When a leakage danger occurs on site, the station control system commands the main valve to close and opens the venting system for emergency venting.

The system has high requirements for flow meters, straight pipe sections, gas analyzers, and rectifiers. The shut-off valves before and after the flow meter are very important and require zero leakage. At the same time, the technical level and installation accuracy of the manufacturing plant also have a direct impact on the accuracy of the measurement system. The above principles are the most basic requirements for ensuring the measurement accuracy of the system. The measuring system designed and manufactured by Teres has the characteristics of high accuracy, continuous and stable measurement, good safety performance, and strict explosion-proof requirements.

Product Features

The accuracy of the flowmeter is better than ± 0.5%, and the accuracy of the measuring system is better than ± 1%;

Complete flow calculation or energy calculation on the flow computer, and also transmit raw data such as flow, pressure, temperature, gas composition, and calorific value to the station control system for flow comparison calculation;

Boring and precision machining of straight pipe sections to ensure measurement accuracy;

Smooth operation without noise;

The station control system collects operating parameters of the metering system, such as flow rate, pressure, temperature, valve working status, etc. When the running metering pipeline fails, the station control system automatically switches the metering pipeline to the backup pipeline to ensure the normal operation of the metering system and continuous supply of gas to downstream owners;

Complete overall pressure testing and functional testing of individual equipment and sled systems in the factory.