Overview
The Compressed Natural Gas (CNG) dispenser is the terminal fuel-delivery system used at refueling stations to safely meter and transfer highly pressurized natural gas (typically at 200 to 250 bar).
Technical Specifications
|
Category |
Key Specification |
|
Pressure Rating |
Max operating pressure: 250 bar (3,625 psi)Design safety pressure: 350 bar |
|
Flow Capacity |
2–75 kg/min dual-hose simultaneous fueling |
|
Metering Accuracy |
Emerson Micro Motion Coriolis meter±0.5% custody transfer accuracy |
|
Filling Efficiency |
2-stage / 3-stage sequencing valvesUp to 98% cylinder fill efficiency |
|
Nozzle Standard |
NGV1 / NGV2 compatible |
|
Safety Protection |
Breakaway coupling rated 3,000 cycles |
|
Operating Temperature |
-40°C to +60°C |
|
Control Strategy |
Cascade storage optimized multi-stage valve logic |
|
Display System |
Heated LCD for low-temperature operation |
Applications & Integration
Fleet Refueling: Configured for overnight sequential filling of transit networks (50+ buses), managing peak flow to prevent station electrical grid overloading.
Public Retail Stations: Dual-sided independent billing interfaces allow simultaneous refueling to maximize vehicle throughput in high-traffic highway stations.
Virtual Pipeline Terminals: Engineered for high-volume gas transfer during daughter-station decanting, maintaining stable flow rates even at declining inlet pressures.
Station Dispensing: Connects directly to high-pressure compressor outputs without external regulation valves, reducing piping connections and leak risks.
Industrial Fleet Hubs: Protocols via Modbus RTU/TCP link up to 8 remote dispensing lanes directly to the station SCADA system.
Installation Support
Footprint
Compact dimensions of 850mm x 500mm x 2100mm, optimized for installation on narrow concrete islands.
01
Structural Anchoring
Secured via 4x M20 high-tensile carbon steel anchor bolts embedded into a minimum 200mm reinforced concrete foundation.
02
Gas Inlet Connection
Configured with triple (3-line) 1/2" Swagelok compression tube fittings for high-, medium-, and low-pressure bank integration.
03
Pneumatic Supply
Requires clean, dry, instrument-grade air at 6 to 8 bar with a pressure dew point below -40°C.
04
Civil Clearance
Complies with a mandatory 3-meter safety radius from high-voltage switchgears and Class I hazardous areas for local regulatory approvals.
05
Quality Control
All pressure-bearing manifolds are hydro-tested at 1.5x design pressure (525 bar) for a minimum of 30 minutes.
Mass spectrometer helium leak testing performed at 350 bar to verify zero-leakage across all joints.
Electronic sub-assemblies and PLC units undergo 72-hour continuous thermal testing at 50°C before final FAT.
Individual Factory Acceptance Testing (FAT) logs include mass flow meter calibration certificates. Third-party inspection (SGS/TÜV) available upon request.
All pressure piping is welded by technicians certified under ASME Section IX and EN ISO 9606-1.
Commercial Terms
MOQ & Customization: Minimum Order Quantity (MOQ) is 2 units. Custom-branded casing and color options are available for orders above 5 units.
Lead Time & Incoterms: Production lead time is 45 calendar days. Available delivery terms: EXW, FCA, and CFR.
Payment Terms: 30% down payment via T/T against drawing approval; 70% balance payable upon successful FAT completion before dispatch.
Export Packaging: Vacuum-sealed moisture-barrier wrap packed inside ISPM-15 heat-treated wooden crates suitable for sea freight.
Warranty: 12 months from commercial commissioning or 18 months from the Bill of Lading (B/L) date, whichever occurs first.
Documentation: Shipments include complete English operation manuals, P&ID schematics, and electrical circuit diagrams.
Compliance & Safety Control
European Certification: Certified to ATEX Directive 2014/34/EU (Zone 1 Ex d e ib IIB T4 Gb). Type-examination certificates are provided with shipping documents.
North American Certification: Complies with NFPA 52 and NFPA 70 (NEC Article 500) for Class I, Division 1, Group D locations.
Factory Certification: Manufactured in facilities certified to ISO 9001:2015, ISO 14001, and ISO 45001.
Overpressure Protection: Two independent mechanical safety relief valves (PRVs) set to actuate at 375 bar for a 350 bar nominal system, routed to a dedicated vent line.
Emergency Shutdown (ESD): Local dual-panel ESD buttons with pre-wired terminal blocks for remote control room integration.
Physical Isolation: Internal steel firewalls separate high-pressure gas piping from the Ex-d explosion-proof electronic display enclosure.
FAQ
Q: How many continuous operating cycles is the dispenser designed for before a major overhaul?
A: The core hydraulic and metering system is engineered for approximately 1.2–1.5 million fueling cycles before requiring full refurbishment. Under typical fleet usage, this corresponds to about 6–8 years of operation.
Q: What is the expected real-world accuracy drift after long-term operation?
A: After around 24 months of continuous service, field calibration data typically shows a drift within ±0.15–0.25% from initial commissioning levels. This is maintained through periodic in-station recalibration without removing the meter.
Q: What is the average unplanned downtime per year in a standard fleet station?
A: In multi-lane fleet applications, unplanned downtime is generally below 1.5% of annual operating hours. Most interruptions are related to external gas supply or communication systems. Preventive maintenance significantly reduces these events.
Q: What kind of diagnostic and monitoring capability is built into the system?
A: The dispenser supports continuous remote diagnostics with event logging stored for up to 5 years. Fault codes are categorized into predictive, operational, and safety layers.
Q: What is the typical service life of key components like valves and hoses?
A: High-pressure valves are generally rated for 5–7 years of service under normal fleet duty cycles. Flexible hose assemblies are recommended for replacement every 18–24 months depending on throughput intensity.
Q: How quickly can critical spare parts be supplied after failure?
A: For standard configurations, critical spare parts such as sensors, valves, and controllers are typically dispatched within 48–72 hours. Regional inventory hubs can reduce delivery time to under 24 hours for high-priority accounts. Custom parts may require up to 7–10 days.
Q: What environmental conditions can affect long-term reliability?
A: Extended exposure below -35°C or above +55°C may increase maintenance frequency due to seal and lubrication stress.
Q: Is there any measurable performance degradation under high throughput usage?
A: At sustained high flow operation above 60 kg/min, system efficiency remains stable, but valve actuation frequency increases wear rate slightly. Field data indicates less than 3% throughput efficiency loss over a 5-year heavy-duty cycle.
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