312-11 - High Pressure Cylinder Hydrostatic Retesting Service

Hydrostatic Testing for Welding Cylinders

Hydrostatic testing is a critical maintenance procedure for any welder or industrial shop that owns its own high-pressure gas cylinders. The Cylinder Retest HP CYLS ONLY service provides a comprehensive evaluation of your cylinder's fitness for service. Under high pressure, gas cylinders store immense potential energy; a failure can be catastrophic. To prevent this, cylinders must undergo requalification at intervals mandated by safety regulations (commonly 5 or 10 years depending on the cylinder material and previous rating).

This service is specifically designed for high-pressure vessels, such as those holding shielding gases (Argon/CO2 mixes), Oxygen, or Nitrogen. The process involves stripping the cylinder of its valve and accessories, filling it with water, and pressurizing it inside a test jacket. The expansion of the cylinder is measured to calculate the "permanent expansion." If the metal has fatigued and does not retract sufficiently, the cylinder is condemned for safety. If it passes, it is cleaned, dried to prevent internal moisture contamination, and re-valved (if requested/applicable).

Regulatory Compliance and Safety

Using a cylinder with an expired test date is not only a safety violation but also illegal in terms of transport and filling. Most gas suppliers will refuse to fill a cylinder that is out of date. This retesting service ensures your equipment complies with Transport Canada and DOT specifications, allowing for legal transport and refilling. It is an essential investment in the longevity of your welding assets and the safety of your shop environment.

• Safety First: Detects invisible metal fatigue and internal corrosion.
• Legal Compliance: Required for refilling and transport on public roads.
• Asset Management: Extends the usable life of expensive high-pressure tanks.