Estimate gas-loss rates through the liner of a Type I, II, III, or IV pressure cylinder. Inputs: liner type, gas, working pressure, temperature, and internal volume. Outputs: monthly and annual loss rate, time to 10% and 50% loss, and a side-by-side comparison across six formats — including the MEYER® sealed liner with no measurable permeation.
Note: indicative engineering values. Actual permeation depends on liner formulation, dome geometry, fill cycle profile, and elastomer seals. Real-world cylinders see 0.5–2× the theoretical rate. Reference values are derived from MEYER® bench measurements at 300 bar / 20 °C (PET: 100 bar lost from 300 bar over 30 days on a production HDRX cylinder). Whole-cylinder permeation is typically dominated by dome geometry and seal permeation rather than liner-intrinsic permeability. The MEYER® sealed liner (2026 H₂/He range) shows no measurable permeation in helium leak-detection testing and is modelled here at the Type I reference rate. For a verified specification with measured permeation data on your specific SKU, request a custom quote.
Gas molecules dissolve into the liner material at the high-pressure side, diffuse through it, and desorb at the low-pressure side. The process follows Fick’s law: rate ∝ (permeability × pressure differential) / wall thickness. For a polymer-lined Type IV cylinder, the gas barrier is the polymer’s solubility–diffusivity product. Metal liners (Type I, III, and IV-M) are effectively zero-permeable at room temperature.
Permeation roughly doubles for every +20 °C and halves for every −20 °C — Arrhenius behaviour driven by polymer chain mobility. A cylinder that loses 30%/month at 20 °C loses ~60%/month at 40 °C and ~15%/month at 0 °C. For aerospace applications with thermal cycling, the integrated rate over the duty cycle is what matters.
These are indicative values from production cylinder measurements. Actual permeation in service depends on liner-specific formulation (additives, processing), seal materials (elastomer permeation can dominate at low base rates), dome geometry, and ambient conditions.
