What Is the CBG Dispenser?
A CBG dispenser is the roadside unit that refuels vehicles with compressed biomethane, metering gas at 200-250 bar through a standardized NGV1 nozzle and recording the mass delivered with a coriolis or thermal mass flow meter, with a breakaway coupling that snaps safely if a vehicle drives off. It is essentially a biomethane-rated CNG dispenser, because CBG and CNG share the same pressure and connector standards.
How the Dispenser Works
The dispenser draws from the cascade banks, steps the pressure down to a controlled fill, measures mass not volume (because gas density varies with temperature), prints or transmits a receipt, and shuts off automatically when the vehicle tank is full. The NGV1 nozzle is the same interface used for natural gas vehicles.
Design Parameter Table
| Parameter | Typical value or range | Why it matters |
| Dispense pressure | 200-250 bar | Vehicle CBG standard |
| Nozzle | NGV1 (ISO 14469) | CNG/CBG compatible |
| Measurement | Mass flow meter | Temperature-independent |
| Safety | Breakaway coupling | Drive-off protection |
| Throughput | Per vehicle fill | Site capacity planning |
| Limitation to check | Gas purity | Protect meter and seals |
CBG vs CNG Dispenser
| Aspect | CBG dispenser | CNG dispenser |
| Gas | Biomethane (renewable) | Fossil natural gas |
| Pressure | 200-250 bar | 200-250 bar |
| Nozzle | NGV1 | NGV1 |
| Difference | Biomethane-rated seals | Standard CNG |
Project Case Study
Zhenyuan Group Biogas Project, Henan. Producing 3 million m³ per year of vehicle-grade methane from 650 tonnes per day of manure and washing wastewater, this project is a working example of CBG as a transport fuel, the end use that a CBG dispenser exists to serve.
| Project | Zhenyuan Group Biogas Project, Henan |
| Location | Xinzheng, Henan, China |
| Industry | Agriculture / Renewable Fuel |
| Application | Vehicle-grade methane production |
| Product | CSTR primary 3 × Ø15.29 × 15 m, secondary Ø5.22 × 6 m |
| Result | 3,000,000 m³ vehicle-grade CH₄ per year |
| Status | Delivered 2013 |
About Shijiazhuang Zhengzhong Technology Co., Ltd (Center Enamel)
Shijiazhuang Zhengzhong Technology Co., Ltd (Center Enamel) supplies the product technology upstream of the dispenser: GFS digester and gas-holder tanks for biogas generation and pressure-vessel manufacturing (I/II class license, ASME, ISO 9001) for the compression and storage that feed a CBG dispenser. The company views the dispenser as the last link of one engineered fuel system.
A CBG dispenser is a biomethane-rated, NGV1-compatible unit metering mass at 200-250 bar with breakaway safety. Send your fill rate and site plan and we will size the dispenser and its cascade feed.
Frequently Asked Questions (FAQ)
Q1: What is a CBG dispenser?
A: A roadside unit that refuels vehicles with compressed biomethane at 200-250 bar through an NGV1 nozzle, metering delivered mass.
Q2: How does a biomethane dispenser work?
A: It draws from cascade banks, controls fill pressure, measures mass with a flow meter, and auto-shuts when the tank is full.
Q3: Is a CBG dispenser the same as CNG?
A: Functionally yes; both use 200-250 bar and NGV1, but the CBG unit is rated for biomethane and its seals suit the renewable gas.
Q4: What safety features does it have?
A: A breakaway coupling, over-pressure protection, and automatic shut-off on a full or fault condition.
Q5: Why measure mass not volume?
A: Gas density changes with temperature, so mass gives a fair, temperature-independent fill.
Q6: What feeds the dispenser?
A: The cascade storage banks, which the compressor fills from the upgraded biomethane.
Suggested CTA
Send your fill rate and site layout. We will size the CBG dispenser and the cascade banks that feed it.