Shandong natural gas flowmeter

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1. How to calibrate gas flow meters without disassembly and assembly? Gas flow meters without disassembly and assembly need to be calibrated using online portable calibration methods under normal operating conditions of the pipeline network. They are divided into two categories: rapid working condition comparison calibration and high-precision standard meter comparison calibration. They must strictly follow measurement specifications such as GB/T 18603-2014 "Technical Requirements for Natural Gas Metering Systems" and JJG 633-2005 "Verification Regulations for Gas Volumetric Flowmeters". It is strictly prohibited to operate flammable and explosive gas pipelines in violation of regulations.

1. Preconditions for disassembly and verification of laughter free manuscripts: 1 Stable operating conditions of the pipeline network: instantaneous flow fluctuation amplitude of ≤± 2%, pipeline pressure fluctuation of ≤± 1%, gas temperature fluctuation of ≤± 2 ℃, and the measured flowmeter has been in normal operation for at least 24 hours; 2. The tested gas flowmeter has no fault alarm: no communication interruption, sensor abnormality, abnormal flow jump or other prompts; Xiao Jue 3. The work area is equipped with combustible gas alarms, the site is well ventilated, and the operators hold special gas operation certificates.

2. Comparison and Calibration Method for Operating Conditions This method does not require external flow equipment and only compares the output signal of the flowmeter itself with the on-site temperature and pressure data, making it suitable for quickly troubleshooting measurement errors.

1. Connect a portable data acquisition device, read the output pulse frequency or 4-20mA current signa

l of the measured flowmeter, and convert it to obtain the operating flow rate.

; 2. Use a portable temperature and pressure sensor to collect the pipeline gauge pressure and gas temperature before and after the flowmeter, and synchronously collect the on-site atmospheric pressure and the standard components published by the local gas management department (if there is no portable component analyzer, it can be directly used); 3. Calculate the standard condition flow rate through the temperature and pressure compensation formula: Qn=Qm × (Pm+Patm)/Pn × Tn/(Tm+273.15), where Qn is the standard condition volume flow rate, Qm is the operating condition volume flow rate, Pm is the pipeline gauge pressure, Patm is the local atmospheric pressure, Pn is the standard atmospheric pressure of 101.325kPa, Tn is the standard temperature of 293.15K, and Tm is the on-site gas temperature; 4. Compare the calculated standard flow rate with the standard flow rate displayed on the flowmeter, and if the error meets the corresponding level requirements, it is considered qualified.

III. Standard Meter Comparison Calibration Method This method synchronously measures with the measured flowmeter through a high-precision portable standard flowmeter, suitable for trade settlement level or high-precision calibration needs

1. Select a portable standard gas flowmeter with an accuracy level one level higher than the measured flowmeter, and use a quick plug connector that meets the explosion-proof level to connect it to the temporary bypass pipeline of the measured pipeline, ensuring that there is no gas leakage at the interface;

; 2. Synchronize the start-up of the tested flow meter and standard meter, and after stable operation f

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