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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:
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. What are the detection processes for turbine flow meters?
The detection process of a turbine flowmeter generally includes the following steps:
1. Appearance inspection: Check whether the appearance of the turbine flowmeter is intact, whether there is damage, wear or corrosion, etc.
2. Preliminary testing: Without disassembling the turbine flowmeter, compare the paired signals or check the shape and amplitude of the original signal to ensure that the output of the flowmeter is normal.
3. Disassembly inspection: If the cause of the malfunction of the turbine flowmeter cannot be determined by preliminary testing, the flowmeter needs to be disassembled.
. During the disassembly process of the flowmeter, it is necessary to carefully record the position and status of each component, and check whether the components are damaged or ineffective. 4. Calibration testing: By installing the flowmete
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