ISO 23933-2006 PDF

Full title and description

ISO 23933:2006 — Aerospace — Aramid reinforced lightweight polytetrafluoroethylene (PTFE) hose assemblies, classification 135 °C/20 684 kPa (275 °F /3 000 psi) and 135 °C/21 000 kPa (275 °F/3 046 psi) — Procurement specification. The standard specifies procurement, construction and performance requirements for aramid-reinforced lightweight PTFE hose assemblies intended for aircraft hydraulic, oil and fuel systems (and compatible pneumatic uses where limited gaseous diffusion through the PTFE liner is acceptable).

Abstract

ISO 23933:2006 defines requirements for aramid-reinforced lightweight PTFE hose assemblies used in aerospace applications with an operating temperature range from −55 °C to +135 °C (−65 °F to +275 °F) and nominal pressure ratings of approximately 20 684 kPa (3 000 psi) and 21 000 kPa (3 046 psi). It covers design classification, materials (PTFE liner with aramid reinforcement), performance limits and procurement specification content for these assemblies.

General information

• Status: Published. (Last reviewed and confirmed by ISO in 2020.)
• Publication date: 2006-01 (January 2006).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.080 (aerospace engineering).
• Edition / version: Edition 1 (2006).
• Number of pages: 23.

Scope

The standard applies to aramid-reinforced lightweight PTFE hose assemblies intended for aircraft hydraulic, oil and fuel systems operating between −55 °C and +135 °C and at nominal pressures of about 20 684 kPa (3 000 psi) or 21 000 kPa (3 046 psi). It also permits use in certain pneumatic systems where limited gas diffusion through the PTFE liner can be tolerated. ISO 23933 is a procurement specification intended to set purchaser/supplier requirements for construction, marking and testing of these hose assemblies.

Key topics and requirements

• Designation and classification of hose assemblies by temperature and pressure ratings (135 °C / ~3 000–3 046 psi).
• Materials: PTFE inner liner combined with aramid fibre reinforcement and compatible covers/finishes for aerospace service.
• Performance and approval criteria relevant to hydraulic, oil and fuel system service (pressure, temperature, fluid compatibility and acceptable gaseous diffusion limits for pneumatic use).
• Procurement/specification content for purchasers and suppliers (construction details, marking, testing and documentation).
• Test and inspection requirements typical for aerospace hose assemblies (pressure/proof/burst testing, dimensional checks and visual/acceptance criteria).

Typical use and users

Primary users are aerospace manufacturers, aircraft maintenance organisations, suppliers of PTFE hose assemblies and procurement/specification engineers who select and procure hose assemblies for aircraft hydraulic, oil and fuel systems. The standard is used to write purchase specifications, verify supplier conformity and ensure that hose assemblies meet defined temperature/pressure and material compatibility requirements.

Related standards

ISO 23933 is one of several ISO procurement specifications for PTFE hose assemblies. Related ISO documents include ISO 8913 (lightweight PTFE hose assemblies with higher temperature classification/variants), ISO 9528 (standard-weight PTFE hose assemblies) and ISO 9938 (PTFE hose assemblies with different pressure classifications). These related standards are produced by the same technical committee (ISO/TC 20/SC 10) and address alternate constructions, weight classes and pressure/temperature ratings for aerospace PTFE hoses.

Keywords

ISO 23933, PTFE hose, PTFE liner, aramid reinforced, hose assembly, aerospace, hydraulic hose, fuel hose, oil hose, procurement specification, temperature classification, pressure rating, ISO/TC 20/SC 10.

FAQ

Q: What is this standard?

A: ISO 23933:2006 is an ISO procurement specification that sets requirements for aramid-reinforced lightweight PTFE hose assemblies intended primarily for aircraft hydraulic, oil and fuel systems.

Q: What does it cover?

A: It covers classification by temperature and pressure, materials (PTFE liner with aramid reinforcement), performance limits, procurement/specification content and test/inspection expectations for hose assemblies used between −55 °C and +135 °C at nominal pressures around 20 684 kPa and 21 000 kPa.

Q: Who typically uses it?

A: Aircraft manufacturers, maintenance organisations, hose assembly suppliers, procurement engineers and specification writers in the aerospace sector use the standard to define, purchase and verify PTFE hose assemblies.

Q: Is it current or superseded?

A: ISO 23933 was published in January 2006 (Edition 1). The ISO record shows it was last reviewed and confirmed in 2020, and at that confirmation it remained current. Users should check with ISO or national standards bodies for any newer revisions or replacement documents after 2020.

Q: Is it part of a series?

A: Yes — ISO 23933 is part of a family of ISO procurement specifications for PTFE hose assemblies addressing different constructions, weight classes and pressure/temperature ratings. Closely related standards include ISO 8913, ISO 9528 and ISO 9938, all produced by ISO/TC 20/SC 10.

Q: What are the key keywords?

A: Key keywords include: PTFE, aramid reinforced, hose assembly, aerospace, hydraulic hose, fuel hose, oil hose, procurement specification, temperature rating, pressure rating.