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『Methane gas flowmeter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
1. Explosion proof level requirements for natural gas flow meters
The selection of explosion-proof level for natural gas flow meters should match the degree of danger and gas category of the operating environment. The core conclusion is as follows
1. Explosion proof level and applicable scenarios. According to different hazardous locations and gas characteristics, common explosion-proof levels are divided into two categories: • Explosion proof type (Exd): • Exd Ⅱ BT6: suitable for Class IIA and IIB gases (such as methane, ethylene, etc.), temperature group T1-T6, covering hazardous areas in zones 1 and 2
. Exd Ⅱ BT4: Supports Class IIA and IIB gases, temperature groups T1-T2, suitable for use in Zone 1 and Zone 2 locations. Exd Ⅱ CT2-6 (under certification): Suitable for Class IIC gases (such as hydrogen and acetylene), temperature range T2-T6, and final certification status needs to be confirmed. • Intrinsic safety type (Exia): • Exia Ⅱ CT6: supports Class IIA, IIB, and IIC gases, temperature groups T1-T6, covering 0 (only intrinsic safety type),
Zone 1 and 2 locations. Exia Ⅱ CT4: Suitable for Class IIA, IIB, and IIC gases, temperature group T1-T2, also applicable to Zone 0 (intrinsic safety only),
1, and 2. two The relationship between temperature group and gas adaptation: Temperature group (T1-T6) represents the maximum allowable temperature on the equipment surface, and should be selected based on the gas ignition point: - T1 ≤ 450 ℃, T6 ≤ 85 ℃, for example, T4 (135 ℃) is suitable for most natural gas scenarios. three Mandatory standards and inspection criteria: Domestic certification must comply with the GB 3836 series standards: - General requirements (GB3836.1-2000) - Explosion
1, 2 zones), gas category (IIA/IIB/IIC), and then match the explosion-proof type and temperature group.
2... Is the LNG truck filled with liquid or a mixture of gas and liquid at the station? What flowmeter is 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 of the natural gas stored inside the vehicle is below minus 162 ℃. For safety reasons, the storage temperature is usually lower than this temperature. Therefore, LNG vehicles operate in low-temperature environments to ensure that natural gas remains liquid. However, due to this low temperature requirement, ordinary cars rarely use LNG as fuel, as it requires special storage equipment and tedious maintenance. In the process of LNG refueling, specific types of flow meters are usually used for measurement to ensure safety and accuracy. These flow meters can accurately measure the flow velocity and total amount of gas under low temperature conditions, ensuring the accurate amount of LNG added to the vehicle. LNG refueling stations are usually equipped with professional refueling equipment, including storage tanks, pumps, flow meters, etc., to ensure the