ISO/TC 58/SC 3/WG 24 - Factors of safety for composite cylinders

This document provides information for the design of composite cylinders related to impact testing and service experience with impact, including: — low energy impact, which can result from events that can occur during handling or working around cylinders; — high energy impact, which can result from accidents during transportation, or impact by large objects with velocity; — drop impact, which can result from handling, where cylinders are dropped or tipped over; and — high velocity impact, which can result from high energy impact by a small object, such as gunfire, and demonstrates non-shatterability of the cylinder or tube. Where appropriate, field experience relevant to testing requirements is provided. NOTE Unless otherwise stated, the word “cylinder” refers to both cylinders and tubes.

This document addresses the topic of cyclic fatigue of structural reinforcing fibres as used in composite cylinders, and cyclic fatigue of structural and non-structural liners in these cylinders. This document provides a basic level of understanding of these topics.

This document addresses the topic of calculation of stress ratios when analyzing filament wound composite cylinders. This document is applicable to cylinders of Types 2, 3, and 4. The calculation of stress ratios supports the development and revision of standards for fibre reinforced composite pressurized cylinders.

ISO/TR 13086-2:2017 addresses the topic of safety and performance of composite cylinders in a fire situation. A statement of safety addresses the topics which should be understood in order to operate cylinders safely in service. The remainder of this document provides a basic level of understanding of these topics.

ISO/TR 13086-1:2011 gives guidance for the design of composite cylinders, relating to stress rupture reliability and burst ratio as a function of test pressure. Related issues, such as cyclic fatigue of the liner and composite, damage tolerance, environmental exposure, and life extension are also addressed. The topics covered by ISO/TR 13086-1:2011 are to support the development and revision of standards for fibre composite reinforced pressurized cylinders.