ISO 9809-1:2019

Overview

ISO 9809-1:2019 - “Gas cylinders - Design, construction and testing of refillable seamless steel gas cylinders and tubes - Part 1” specifies minimum requirements for quenched and tempered seamless steel cylinders and tubes with a maximum actual tensile strength (Rma) of less than 1 100 MPa and water capacities up to and including 450 L. This third-edition (2019) international standard covers material selection, design, manufacturing, inspection and testing at the time of manufacture for cylinders used for compressed, liquefied and dissolved gases.

Key topics and requirements

• Materials and metallurgy: minimum material controls, chemical composition checks, typical steel types and heat-treatment guidance for quenched and tempered steels.
• Design rules: requirements for shell thickness, convex and concave end designs, neck, foot and neck rings, limitations on tensile strength, and required design drawings.
• Manufacturing and workmanship: wall thickness tolerances, surface imperfection criteria, straightness, out-of-roundness and diameter controls.
• Inspection & nondestructive testing: ultrasonic examination procedures and acceptance criteria (Annex B), evaluation of manufacturing imperfections (Annex A).
• Type approval & batch testing: prototype testing, pressure cycling, bend/flattening tests (prototype), batch sampling, tensile, impact and hydraulic burst tests, proof pressure, volumetric expansion, hardness, leak and capacity checks.
• Thread and mechanical checks: new thread test requirements and informative shear strength/torque guidance (Annex G).
• Certification & marking: type approval certificates, batch/acceptance certificates and mandatory marking information for traceability.

Applications and who uses it

ISO 9809-1:2019 is used by:

• Cylinder manufacturers for design, process control and production acceptance.
• Design and engineering teams specifying safe cylinder geometry and materials.
• Testing and inspection laboratories performing batch and proof tests (hydraulic, tensile, impact, ultrasonic).
• Certification bodies and regulatory authorities issuing type approvals and conformity assessments.
• Gas suppliers, transporters and end-users who require cylinders compliant with international safety and transport regulations (including reference to UN Model Regulations).

Related standards

• Other parts of the ISO 9809 series (other materials and strength classes).
• UN Model Regulations on the transport of dangerous goods (standard is written to be referenceable).
• ISO/TC 58 technical committee publications for gas cylinder standardization.

Keywords: ISO 9809-1:2019, gas cylinders, seamless steel, quenched and tempered, design, construction, testing, refillable cylinders, tensile strength <1100 MPa, hydraulic test, ultrasonic examination.