CNG Regulator Test Bench, rated to 330 bar.

Introduction

Ensuring the reliability and safety of CNG regulators is paramount for any fleet using compressed natural gas, as regulator failure can lead to unsafe pressure fluctuations or gas leaks. The Neometrix CNG Regulator Test Bench simulates service conditions by performing up to 50,000 pressurization–depressurization cycles across varying pressures and temperatures, in accordance with ISO 15500-9:2001(E) for regulator life-cycle testing. It also incorporates high-pressure leak detection to certify components before vehicle assembly.

Key Features

• Air Drive Section: Provides a clean, regulated air supply (5 bar minimum) to the booster via a 5 µm coalescing filter and precision pressure regulator, ensuring consistent drive performance and preventing moisture-induced damage to the booster mechanism.
• Air Boosting System: Employs a Haskel AG-15/75 pneumatic gas booster, capable of boosting inlet air (100 psi) to outlet pressures up to 15,000 psi (≈1,034 bar) with a maximum compression ratio of 100:1. Oxygen-cleaned and assembled in ISO 9001/AS9100 certified Class 5 cleanrooms for high-purity operation.
• Dual Pressure Lines & Automation: Two independent circuits (300 bar and 330 bar) with automatic pressure-switch shutdown protect the unit under test (UUT) and operator. Integrated PLC logic and scheduling software automate cycling tests and safety interlocks.
• Digital Pressure Indicator (DPI): A full-featured DPI with ±0.25% full-scale accuracy displays real-time pressure, offers tare, peak-hold, max-min readings, and supports multiple engineering units. Bi-color LEDs provide instant pass/fail status against preset tolerances.
• Safety & Compact Design: Includes relief and solenoid valves, emergency-stop interlock, and a compact, panel-mount layout. High-pressure components are rated to 330 bar and comply with industry safety standards.

Applications

• OEM Production & Service Centers: Rapidly certify regulators, filters, and valves during assembly line quality control or after maintenance overhauls.
• R&D & Laboratory Testing: Validate new regulator designs under accelerated life-cycle conditions to identify wear patterns and optimize component lifespan.
• Regulatory Compliance: Supports certification labs with Category 4 testing licenses to verify fuel system integrity per U.S. FMVSS 303, reducing liability and ensuring adherence to global safety mandates.

Technical Specifications

Manufacturing & Quality Assurance

All critical components are procured from certified suppliers and undergo rigorous pre-assembly inspection:

• Gas Booster: Haskel AG-15/75, oxygen cleaned in Class 5 cleanrooms to MIL-SPEC 1330D standards.
• Filters & Regulators: Camozzi and Swagelok modules tested to ISO 8573-1 for particle and moisture removal.
• Gauges & Transmitters: Wika analog gauges and GE Druck digital transmitters calibrated to ±0.05% FS.
• Traceability & Testing: Each assembly receives a unique serial number, factory hydrostatic and leak testing to 1.5× maximum operating pressure, and calibration certificates for pressure instruments.

Test & Qualification Procedures

1. Initial Setup & Safety Checks: Verify filtered, dry drive air supply and inspect all high-pressure fittings. Confirm emergency-stop and relief valve operation before energizing.
2. Regulator Cycling Test: Program PLC to cycle between low (10 bar) and high-pressure limits (248 bar or 330 bar) at specified dwell times, executing up to 50,000 cycles per ISO 15500-9:2001(E). Record leak rates and regulator response times.
3. Leak & Overpressure Tests: Hold UUT at maximum set pressure for a defined duration; use helium leak detection if required. Perform controlled overpressure excursion (110% of set point) to validate relief valve operation.
4. Data Logging & Reporting: Automatically capture pressure vs. time data, peak-hold and min-max values. Generate test reports with certification stamps for compliance documentation.

Compartments & Functional Components

• Air Drive Module: Inlet filter, pressure regulator, solvent valve, and toggle switch.
• Desiccant Dryer Cartridges: Exchangeable units to maintain –40°C dew point.
• Booster Assembly: Haskel AG-15/75 booster head, pilot stages, and pressure-switch actuators.
• Control Panel: PLC/HMI interface for test programming, DPI readout, status LEDs, and emergency-stop.
• Outlet Manifold: Dual-pressure ball and needle valves, quick-connect fittings, relief and vent valves.
• Fixture Area: Customizable mounts for a wide range of regulator sizes and connection types.

Conclusion

The Neometrix CNG Regulator Test Bench combines automated life-cycle testing, precise pressure control, and comprehensive safety features to deliver a turnkey solution for regulator validation. By meeting international standards and offering modular expandability, it minimizes downtime, enhances quality assurance, and supports regulatory compliance — making it an indispensable asset for any organization committed to the safe, efficient use of CNG technology.