The Proactive Safety Check Every CNG Cylinder Needs.
Hydrostretch Testing reveals early signs of material fatigue and structural weakness, helping operators prevent failures, minimize downtime, and extend cylinder life.
Hydrostretch Test: A Proactive Safety Measure, Not Just a Regulation in Ensuring Safety & Longevity of CNG Cascade Cylinders
Compressed Natural Gas (CNG) cascade cylinders operate under extreme pressure - making Hydrostretch Testing an essential part of any gas storage and distribution safety protocol. This test evaluates elastic expansion and structural integrity by applying hydraulic pressure beyond standard working limits. It's not just a compliance formality - it's a proactive safety assurance process.
Why Hydrostretch Testing Matters:
- Detects material fatigue or wall thinning before failure.
- Identifies micro-cracks, permanent elongation, and other structural weaknesses.
- Confirms the cylinder's ability to return to its original shape post-pressurization.
- Prevents unexpected cylinder failures that can lead to safety incidents, system downtime, or financial loss.
Key Testing Parameters:
- Normal Operating Pressure: 200–250 bar
- Hydrostretch Test Pressure: 1.5× working pressure (≈ 300–375 bar)
- Testing Frequency: Every 3 years as per regulatory standards
- Cylinder Life: Typically 20 years, subject to periodic testing and approval
Hydrostretch testing is a vital step in maintaining safety, minimizing risk, and ensuring the reliable operation of high-pressure CNG systems. It supports long-term infrastructure integrity and is essential for any organization involved in city gas distribution, industrial gas supply, or fleet fueling systems.