ISO 13088:2011

Overview

ISO 13088:2011 - "Gas cylinders - Acetylene cylinder bundles - Filling conditions and filling inspection" defines minimum requirements for the safe filling and inspection of acetylene cylinder bundles. The standard covers bundles filled with cylinders assembled in the bundle and bundles where individual cylinders are filled and later assembled. It excludes solvent-free acetylene cylinders and individual cylinders not intended for bundling (see ISO 11372). Where a regulation conflicts with ISO 13088, the regulation takes precedence.

Key Topics

• Filling conditions: Specifies how to determine the maximum acetylene content for cylinders in a bundle (manufacturers often reduce content, e.g., to ~90% of individual-cylinder charge, to allow a solvent operating range).
• Solvent content and operating range: Defines maximum/minimum solvent content and how to derive the solvent operating range (Annex A). Typical solvents referenced include acetone and DMF; practical limits on consecutive fills differ by solvent (acetone bundles commonly limited to about 6 consecutive fills; DMF bundles may be filled up to 100 times before solvent replenishment).
• Tare and gross weight: Introduces bundle tare definitions (tare BA/BS min/max) and maximum gross weight calculations used for filling and transport planning.
• Assembly, marking and documentation: Requirements for identification plates, bundle dossiers, and required filling data (gas name/UN number, working pressure, solvent type, maximum acetylene content, next inspection date, etc.).
• Filling inspection: Specifies pre-fill, during-fill and post-fill inspection steps, solvent-content checks (Annex B), and limits on the number of consecutive fillings before bundle dismantling and replenishment.
• Procedures and annexes: Annex A - procedure to establish filling conditions; Annex B - method to determine solvent content during filling inspection.

Applications and Users

ISO 13088 is practical for:

• Cylinder manufacturers and bundle fabricators (defining maximum content, tare values, and type approval data)
• Gas filling stations and fillers (pre-fill, during-fill and post-fill inspection protocols)
• Fleet owners/operators and safety managers (dossier maintenance, marking, tracking consecutive fills)
• Regulatory bodies and safety auditors (ensuring filling practices meet international norms)

This standard supports safe handling, transport planning, and lifecycle management of acetylene cylinder bundles, aiding compliance, risk reduction and consistent filling inspection practices.

Related Standards

• ISO 11372 - Acetylene cylinders: filling conditions and inspection for individual cylinders
• ISO 3807 - Acetylene cylinder design and manufacture guidance
• ISO 80000-4 - Units and quantities (note: ISO 13088 uses bar as the common pressure unit and lists pressures as gauge pressure)