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How to load and unload the battery on the LNG liquefied natural gas flow meter?
Open the lid of the ton tank small box to remove it, find the positive and negative poles, and then install them according to the positive and negative terminals of the battery.
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; • 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 or
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. May I ask if the LNG refueling station fills the LNG truck with liquid or a mixture of gas and liquid? What flowmeter should be used for measurement ..
LNG， Liquefied natural gas, mainly composed of methane. At room temperature, methane cannot exist in liquid form, so the LNG refueling station at Qiaofeng Station actually injects gaseous substances into LNG vehicles. The LNG stored inside these vehicles is actually compressed gas, not liquid, so these vehicles should be called compressed natural gas vehicles, abbreviated as CNG vehicles. LNG vehicles do exist in reality, but these vehicles must ensure that the temperature o