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1. National standard for installation of natural gas flow meters. The installation of natural gas flow meters must strictly follow national standards, with a focus on four scenarios: liquefied natural gas (LNG), turbine flow meters, orifice plates, and nozzles. 1. Liquefied Natural Gas (LNG) Fluid Specification (GB/T 44398-2024) applies to flow meters for liquefied natural gas and other refrigerated hydrocarbon fluids, with core requirements including calibration standards: Flow meters must be calibrated according to dynamic measurement characteristics; Installation environment: Special sealing and insulation conditions for low-temperature fluid transmission must be met; • Implementation time: Released in August 2024, officially effective on March 1, 2025
2. Gas Turbine Flow Meter Standard (GB/T 21391-2022) proposes three installation methods for turbine flow meters: • Standard installation: upstream straight pipe section ≥ 10 times the pipe diameter (10D), downstream ≥ 5D; • Short pipe installation: equipped with flow regulator, total straight pipe section ≥ 6D; • Compact installation: suitable for intelligent flow meters, allowing for smaller space layout; • Process requirements: The deviation of the inner diameter of the pipeline should be ≤ ± 1%, the insertion depth of the temperature sensor should be ≤ 1/3 of the pipe diameter, and the protection level should be ≥ IP65
3. The original 2008 version of the standard orifice flowmeter specification (GB/T 21446) will be replaced by a new version in 2025. The current key points include: • Aperture ratio: The orifice plate and pipeline diameter should be strictly matched, and the edge should be kept sharp and wear-resistant; • Pressure measurement position:
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4. Requirements for standard nozzle flowmeter (GB/T 34166-2017) applicable to high flow natural gas measurement, key specifications: • Nozzle shape: ISA 1932 standard or long diameter nozzle, throat size tolerance ≤± 0.1mm; • Installation angle: When installing horizontal or vertical pipelines, the fluid flow direction needs to be corrected; • Length of straight pipe section: upstream ≥ 10D, downstream ≥ 4D (adjusted according to the type of disturbance source). If you need to obtain complete specification documents, you can contact China Standard Press to inquire or order official publications.
2. Plug in electromagnetic flowmeter
Overview: In pipeline water supply, more and more flow meters are used for large water users metering and regional metering systems to reduce leakage rates.
. To achieve leakage monitoring in the pipeline network, it is necessary to monitor the low water consumption at night. The plug-in electromagnetic flowmeter can provide high-precision measurement in both directions and is an ideal flowmeter for leak detection. Meanwhile, outstanding repeatability ensures that only true traffic mutations are detected. Principle: The working principle of the plug-in electromagnetic flowmeter is based on Faradays law of electromagnetic induction. In an electromagnetic flowmeter, the conductive medium inside the measuring tube is equivalent to a conductive metal rod in Faradays test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a