The Hydrogen Cylinder Hydrogen Cycle Test System, independently developed by HiFluid, is designed to evaluate fatigue life under extreme temperature conditions and varying hydrogen temperatures. The standard test pressure is 87.5MPa, with test environments ranging from −40°C to 85°C.

The system complies with major international standards, including GTR13, ECE R134, SAE J2579, ISO 19881, and ANSI/CSA HGV2, and can be customized to meet specific customer requirements. It is also applicable to CNG cylinders or other pressure vessels requiring gas cycling tests.

Operation uses a hydrogen tube trailer as the primary source, with gas distributed via a discharge manifold into medium-pressure storage. When tube trailer pressure is low, the system switches to low-pressure storage, with a recovery compressor boosting pressure back into medium storage. A high-pressure compressor then raises the pressure further into a high-pressure hydrogen storage vessel.

Gas from the high-pressure vessel charges the test cylinder via a proportional valve, with a mass flow meter monitoring and maintaining flow. The closed-loop control of the proportional valve and flow meter ensures precise real-time adjustment of filling rate. During discharge, gas flows through the proportional valve and flow meter into low-pressure storage, with flow limited according to EFV safety thresholds. The recovery compressor re-pressurizes this gas back into medium storage, completing the test cycle.