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LNG CNG Station Equipment Manufacturer Reminds Everyone of the Operating Precautions for CNG Dispensers

23 Dec,2020

LNG CNG Station Equipment Manufacturer Reminds Everyone of the Precautions for Using CNG Dispensers

　　An LNG filling station is a facility that dispenses liquefied natural gas (LNG) to LNG-powered vehicles. Its main equipment includes an LNG storage tank, a fully functional pump skid, and an LNG dispensing unit. According to manufacturers of LNG filling station equipment, the primary operational modes of such stations are as follows: Filling mode: LNG from the storage tank is drawn out by a cryogenic LNG pump, pressurized, and then dispensed into vehicles via the dispensing unit. Unloading mode: A cryogenic pump transfers LNG from the LNG tanker truck into the LNG storage tank. Pressurization mode: A portion of the LNG in the storage tank is injected into a vaporizer, where it is converted into boil-off gas (BOG) and returned to the tank; the process stops when the tank pressure reaches the set value. Next, LNG CNG Station Equipment Manufacturer —This section mainly outlines the relevant precautions for using gas filling machines.
　　Temperature control function: A low-temperature LNG pump draws a portion of the LNG from the storage tank and injects it into the heater before returning it to the tank; operation ceases when the liquid temperature reaches the set value.
　　Gas filling machine
　　Working medium: LNG
　　Gas filling rate: 3–80 kg/min
　　Measurement accuracy: Class 1.0
　　Repeatability: 0.5%
　　Operating pressure: 1.6 MPa
　　Design Temperature: -196°C to 55°C
　　Vacuum Module Planning
　　High-brightness large-screen display with adjustable measurement units.
　　Two-layer pull-out maintenance
　　Standard vacuum inflation hose
　　Optional explosion-proof mini-label printer
　　Metal Keyboard Configuration
　　Let’s discuss the operational precautions for CNG dispensers from an LNG refueling station equipment manufacturer:
　　1. Before each power-up of the fueling dispenser, first check that the external air pressure is sufficient (>0.4 MPa).
　　2. After the fuel dispenser is powered on, the small circulation valve shall trip, unless specially configured otherwise; the display screen shall show the data for the most recent fueling operation. The screen next to the numeric keypad shall display “Fueling Available.”
　　3. Large-circulation pre-cooling should be performed as infrequently as possible; its frequency can be adjusted based on defrosting conditions or ambient temperature, with the number of cycles appropriately increased when the ambient temperature is high.
　　4. The flow meter used in the CNG dispenser is a mass flow meter; the physical unit is not under vacuum and is internally filled with an inert gas, which can lead to frost formation during prolonged operation. CNG station equipment manufacturers do not recommend insulating the flow meter, as this would compromise measurement accuracy.
　　5. Before each operation, the fuel dispenser must be purged, particularly to remove ice chips and foreign matter from the internal sealing ring area, as these can easily damage the seal and shorten its service life.
　　6. The sealing gasket of the fuel dispenser is highly susceptible to damage and relatively expensive. During operation, apply balanced force with both hands: first relieve the pressure, then firmly press the handle and gently pull it out.
　　7. When the internal sealing gasket of the fuel dispenser is damaged, a leak will occur when the fuel nozzle is disconnected; if a leak occurs during fueling, it is usually due to damage to the external sealing ring. The external sealing ring is more prone to damage than the internal sealing gasket, and damage to the internal sealing gasket can easily result in injury.
　　8. The service life of the sealing rings and gaskets on the fuel dispenser is measured in number of cycles; therefore, minimize the number of times the fuel nozzle is inserted and removed. When not in use, the nozzle can be hung on the hook rather than left inserted in the dispenser’s nozzle holder.
　　The above part is LNG CNG Station Equipment Manufacturer —An analysis of the precautions for using CNG dispensers by CIMC Sanctum Cryogenic Equipment. Zhangjiagang CIMC Sanctum Cryogenic Equipment Co., Ltd. specializes in cryogenic liquid storage tanks and tank truck transportation services for liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide, and liquefied natural gas (LNG), offering robust safety guarantees, rapid service, and high efficiency. We welcome you to contact us for consultation and collaboration.