04/11/2026
Before send your cylinder in for testing, ensure it has the following stamped by the manufacturer on the shoulder as we have had numerous cylinders being sent in without all of these.
1. Design Specification / Standard: The manufacturing standard under which the cylinder was designed and constructed (e.g., SANS 9809-1, ISO 9809-1, DOT 3AA). This has to be a standard listed in the regulations.
2. Manufacturer's Serial Number: A unique serial number assigned by the manufacturer (which must never be removed).
3. Test Pressure (P_H): The hydrostatic test pressure stamped in kPa or bar (e.g., PH 25 MPa or 250 bar).
Note: For Department of Transportation (DOT/ICC) specification cylinders, the service pressure in psi (e.g., DOT 3AA 2015) is stamped.
4. Tare Mass: The empty mass of the cylinder shell including fixed fittings, stamped in kilograms (kg).
Exemption: Permanent compressed gas cylinders are not required to be stamped with tare mass unless converted to liquefiable gas service.
5. Water Capacity (WC): The total internal volumetric water capacity, stamped in litres (L). (Mandatory for all cylinders in liquefiable gas
6. Working pressure, where the cylinder is used for a permanent gas.
When a cylinder is sold to a customer, the manufacturers documentation should be supplied to be available from the seller as the seller assume the responsibility of the manufacturer.
