What aspects should be noted when using:

1. Use of each route

After installation, it should be ensured that all chips and residues have been removed, the system has been purged, pressure tested, and the airflow has entered and increased to the flow rate of the inlet valve.

1.2 Open the upstream bypass ball valve of the turbine flowmeter

1.3 Slowly open the upstream bypass small shut-off valve of ZR-LWGY turbine flowmeter, and slowly fill the gas until it reaches the electric forced sealing ball valve downstream of the turbine flowmeter.

Attention: Severe pressure fluctuations or excessive high-speed pressurization can damage the turbine flowmeter. To protect the gas turbine flowmeter, the pressure increase added to the turbine flowmeter cannot exceed 35kPa/s. If the pressure change cannot be measured on site, the flow rate of the turbine flowmeter should not exceed the limit.

1.4 Close the bypass ball valve and shut-off valve.

Rotate the handwheel to open the forced sealing valve at the inlet.

Slowly open the electric forced seal ball valve downstream of the turbine flowmeter (for at least 1 minute), use the manual switch on the electric actuator, and be careful not to overspeed the turbine flowmeter.

1.7 Follow steps 1.2-1.6 to complete the system pressurization and start measuring natural gas.

Online comparison of gas turbine flow meters (comparing working and main circuits)

2.1 Ensure that the inlet and outlet valves of the main road are closed.

2.2 According to steps 1.2, 1.3, and 1.4 in "1 Use of Each Road", pressurize the main road.

2.3 Close the electric forced sealing ball valve at the outlet of the working path, slowly open the forced sealing ball valve of the comparison pipeline, and slowly open the electric forced sealing ball valve at the outlet of the main path (doing three tasks simultaneously).

2.4 The gas passes through the working path and the main path in sequence. Two turbine flow meters can be compared with each other to check for significant deviations.

After the comparison is completed, close the two forced sealing ball valves on the comparison pipeline and the main pipeline, and open the outlet ball valve of the working pipeline (doing three tasks simultaneously).

At this point, the work path resumes.

3. Use a mobile calibration vehicle to calibrate the gas ZR-LWGY turbine flowmeter online

3.1 Ensure that the electric forced seal ball valve between the two calibration ports is in the closed state.

3.2 Open the ball valve on the flange blind plate of the calibration port to ensure that there is no pressure inside the flange blind plate. Then remove the flange blind plate.

3.3 Connect the mobile calibration vehicle to the calibration port.

3.4 Charge the main circuit according to steps 1.2, 1.3, and 1.4 in "1. Use of each circuit".

3.5 Close the electric forced sealing ball valve at the outlet of the working path, slowly open the forced sealing ball valve of the comparison pipeline, and slowly open the two calibrated forced sealing ball valves on the main path (simultaneously doing these four tasks).

At this point, the gas flows through the two gas turbine flow meters inside the sled and the mobile calibration vehicle in sequence. After completing the online calibration, close the two ball valves at the calibration port, slowly open the forced sealing ball valve of the comparison pipeline, and slowly open the electric forced sealing ball valve at the outlet of the working path (all four tasks are done simultaneously).

3.8 Reinstall the flange blind plate and do not forget to close the ball valve on the flange blind plate. 3.9 At this point, the work path resumes.