Integrated Metering Skid

Integrated Metering Skid
I. Core Functions (Concise Positioning)
Precise Metering
Real-time measurement of key parameters of fluids (gas, liquid) including flow rate, pressure, temperature and density, outputting traceable and accurate data. Applicable for trade settlement, process control and energy consumption statistics.
Integrated Control
Integrates functions such as filtration, pressure regulation, flow distribution and safety protection (overpressure/overtemperature alarm, emergency shutdown), realizing an integrated system of measurement + regulation + safety assurance.
Easy Installation & Maintenance
Factory prefabricated and integrated (modular assembly of pipelines, valves, sensors, instruments and control systems). On-site connection only required for inlet/outlet pipelines and power supply, shortening on-site construction period and reducing operation and maintenance costs.
II. Working Principle (Modular Breakdown, Focusing on Core Logic)
1. Fluid Pre-Treatment Module (Ensuring Measurement Accuracy)
Function: Filters impurities (strainer/filter), stabilizes pressure (pressure reducing valve/pressure regulating valve) and eliminates pulsation (buffer), preventing particles and pressure fluctuations in the fluid from affecting sensor measurement accuracy.
Key Parameters: Filtration accuracy (commonly 10~50μm), pressure regulation range (set according to working conditions, e.g., 0.1~0.6MPa for natural gas metering skids).
2. Sensing & Measurement Module (Core Data Acquisition)
Core Components: Flow sensor (selected by medium type), pressure sensor, temperature sensor, densitometer (for liquid/high-pressure gas).
Common Sensor Principles:
Gas Metering: Ultrasonic flowmeter (no pressure loss, accuracy ±0.5%), turbine flowmeter (accuracy ±1.0%), Roots flowmeter (for medium and low pressure, accuracy ±0.5%);
Liquid Metering: Positive displacement flowmeter (gear/oval gear, accuracy ±0.1%~±0.5%), electromagnetic flowmeter (for conductive liquids, accuracy ±0.2%), Coriolis mass flowmeter (direct mass measurement, accuracy ±0.1%, suitable for viscous/corrosive liquids).
Data Acquisition Logic: Sensors convert physical parameters (flow velocity, pressure, temperature) into electrical signals (4~20mA current signal / pulse signal) and transmit them to secondary instruments in real time.
3. Data Processing & Calculation Module
Core Components: Secondary instrument (flow totalizer), PLC/RTU control system.
Calculation Logic:
i. Collect raw sensor data (e.g., flow sensor pulse count, pressure/temperature values);
ii. Perform temperature and pressure compensation calculations based on medium properties (e.g., gas compressibility factor, liquid density) using standard formulas (e.g., AGA8/GB/T 18603 for gas, volume correction formula for liquid) to obtain flow rate under standard conditions (e.g., standard volumetric flow rate Nm³/h, mass flow rate kg/h);
iii. Store data (local cache + remote upload), display real-time values and trigger alarms (when over-range/overpressure occurs).
4. Control & Safety Module
Control Function: Automatically adjust valve opening based on measured data (e.g., throttle valves when flow exceeds limit) and maintain stable pressure;
Safety Protection: Trigger safety valve pressure relief and close emergency shutdown valve upon overpressure/overtemperature to prevent equipment damage or medium leakage.
5. Output & Communication Module
Data Output: Real-time data and cumulative flow displayed on local screen; supports remote communication (Modbus, HART, 4G/5G), with data uploaded to a central control system or cloud platform (for remote monitoring and report generation).
III. Typical Application Scenarios
Natural gas transmission and distribution (gate station metering skids, industrial user metering skids), crude oil/refined product transportation, chemical medium metering, municipal water supply/heating metering, new energy (LNG/CNG refueling station metering).
Core Summary
The essence of a metering skid is a modular solution combining sensors + algorithms + integrated control. Its core objective is to achieve precise measurement, stable control and convenient operation & maintenance of fluid parameters through standardized integration, suitable for industrial/energy scenarios requiring high-precision metering and complex working conditions.