Flow meter welding | Installation steps for hot gas mass flow meter (insert type)

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1. Precautions for Welding and Installation of Flow Meter

The core of welding and installation of flow meters is to ensure precise measurement accuracy and equipment safety. It is necessary to strictly follow the welding process, avoid sensor damage and lifting, and ensure that the inner wall of the pipeline is smooth and free of protrusions. 1. Preparation before welding • Pipeline treatment: Remove the oxide layer, oil stains, and impurities on the inner wall of the pipeline to ensure that the smoothness of the welding area is consistent with the pipeline • Positioning calibration: Use a special fixture to fix the flowmeter to ensure that the concentricity error with the pipeline is less than 0.5mm, and the parallelism deviation at the flange connection is less than 0.1 ° • Material compatibility: Check the compatibility of the flowmeter material (such as 316L stainless steel) with the thermal expansion coefficient of the pipeline material. 2 Welding process control • Temperature control: argon arc welding (TIG) is used to maintain interlayer temperature ≤ 120 ℃, avoiding PTFE lining or coil failure in the sensor due to high temperature • Welding material selection: low carbon welding wire such as ER308L with sulfur/phosphorus content<0.015% is used to prevent intergranular corrosion • Protective gas: argon purity ≥ 99.99%, flow rate 12-15L/min, ensuring that the back is formed without oxidation Special type precautions • Electromagnetic flowmeter: When welding, the sensor should be removed to prevent the old coil of the excitation sensor from breaking through the insulation due to welding current (>30A) • Vortex flowmeter: To avoid welding slag splashing onto the vortex generator, high-temperature resistant

ceramic plates should be used to cover the probe area • Ultrasonic flowmeter: When welding adjacent pipe sections, the transducer should be cooled to below 50 ℃ before installation to prevent high temperature damage to the acoustic coupling layer 4 Post weld treatment • Inner wall treatment: Use a pipeline mirror to inspect the inner weld seam, and polish the excess height to<0.5mm to avoid flow field disturbance • Pressure testing: First, perform an air tightness test at 1.5 times the working pressure (≤ 0.5MPa using air,>0.5MPa using water pressure) • Electrical verification: After restoring the wiring, measure the coil insulation resistance (≥ 100M Ω @ 500VDC), and the electrode resistance difference should be<10% 5 Safety Warning: Welding on pressurized pipelines is strictly prohibited, and it is necessary to confirm that there are no residual flammable/toxic media (flammable gas concentration<0.5% LEL) in the pipeline. The welding grounding wire must be connected to the pipeline 3 meters away from the flowmeter to prevent high current (>100A) from flowing back through the sensor grounding wire. For explosion-proof flowmeters (Ex d Ⅱ CT6), the power supply must be disconnected first and the explosion-proof joint surface must be confirmed to be cooled before recovery to prevent structural deformation and damage to the explosion-proof gap. 2. Installation steps for thermal gas mass flowmeter (plug-in type): SLF-3000 thermal gas mass flowmeter (plug-in type) installation operation process:

1、 Requirements for selecting installation point straight pipe section: The installation point should be a horizontal straight pipe section, with the upstream throttling element at a distance greater than 5 times the diameter

Flow meter welding | Installation steps for hot gas mass flow meter (insert type)

1. Precautions for Welding and Installation of Flow Meter

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