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1. Can the on-site verification of natural gas flow meters be completed without dismantling?
Most commonly used natural gas flow meters can be verified without dismantling, but specific prerequisites must be met.
1. Types and methods of mainstream flow meters that can be verified on-site without disassembling the machine (1) Ultrasonic natural gas flow meter 1 Clamp on ultrasonic flowmeter is the most commonly used type in industrial sites that can be calibrated online without disassembling the machine. By using external sensors to collect the ultrasonic propagation time difference of the fluid in the pipeline and combining it with a portable standard flow calibrator, it can complete real flow calibration without stopping the gas or removing the flowmeter body. If the built-in ultrasonic flowmeter has reserved an online calibration interface, it can be directly connected to a dedicated calibration equipment to complete parameter calibration without disassembling the machine. （2） Turbine and vortex street natural gas flowmeter 1 The same type of flowmeter with online verification reserved interface can be calibrated without disassembly by comparing the output signals of the measured flowmeter and the standard flowmeter through an external portable pulse signal acquisition device. Backup virtual 2. For old models without reserved interfaces, temporary bypass pipelines can be built and connected to portable standard flow meters for real flow comparison and verification without the need to remove the main flow meter. （3） Differential pressure natural gas flowmeter (orifice plate, Venturi tube) 1 The on-site calibration of the overall measurement system can be completed by simply verifying the differential p
2. Specific scenarios that require disassembly and verification 1 When the flowmeter body experiences hardware failures such as mechanical jamming, internal blockage, or sensor damage, it must be disassembled for maintenance before calibration can be carried out. 2. Old small flowmeters without online calibration interfaces cannot be effectively calibrated through external equipment and need to be disassembled for inspection or reinstalled after calibration in the laboratory. 3. When the measuring system exceeds the tolerance and cannot be restored through online parameter adjustment, the internal structure needs to be disassembled for inspection and recalibration.
III. Safety and Accuracy Limitations for On site Non dismantling Verification 1 Before verification, it is necessary to confirm that the natural gas pressure and flow rate inside the pipeline are stable to avoid fluctuations that may cause distortion of verification data. 2. For high-pressure and large-diameter natural gas pipelines, it is necessary to confirm in advance that the bypass system is normal to prevent the risk of overpressure leakage during the verification process. 3. All on-site verification operations must be carried out by professionals with metrological verification qualifications, and safety regulations for gas pipeline operations must be strictly followed.
2. What could be the reason why TWC802 displays a given amount but no flow?
The most likely reason for TWC802 flowmeter displaying