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『Installation requirements for nozzle flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
1. Is there a reverse angle when installing a nozzle flowmeter, just like an orifice flowmeter, which has a groove?
There is a reverse angle when installing a nozzle flowmeter. The groove of a 1/4 circular nozzle is not straight like an orifice plate, but a 1/4 arc. When installing the rental mold, the large mouth (arc) should face forward (the orifice plate should have the large mouth facing backward). When installing the nozzle and long nozzle, the arc faces forward, while the narrow and gentle nozzle faces backward.
2. National standards for the 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, 20252. 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; • Proce
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: Use corner joint or flange pressure measurement, with a spacing error within ± 0.1%; • Front and rear straight pipe sections: upstream ≥ 30D, downstream ≥ 5D (adjusted according to working conditions)
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.
3. Can the nozzle flowmeter be installed during steam blowing?
The nozzle flowmeter is a throttling flowmeter installed in the process pipeline.
. According to Article 4 of Section 6.5.1 of GB 50093-2013 "Code for Construction and Quality Acceptance of Automation Instrumentation Engineering", it is required that "4. The throttling element must be installed