ISO 14085-5-2015 PDF

Full title and description

ISO 14085-5:2015 — Aerospace series — Hydraulic filter elements — Test methods — Part 5: Resistance to flow fatigue. This part specifies a laboratory method to determine a hydraulic filter element's resistance to flow-induced fatigue caused by cyclic or varying flow rates through the element during progressive contaminant loading, using defined cycle counts and differential pressure conditions to enable comparative evaluation of aerospace hydraulic filter elements.

Abstract

ISO 14085-5:2015 establishes a repeatable test procedure that subjects a filter element to a uniform varying flow rate for a specified number of cycles at predetermined differential pressures to assess its resistance to flow fatigue. The standard notes that the test simulates possible service stresses but is not intended to qualify an element for specific in‑service conditions (which require bespoke test protocols reflecting the actual fluid, contamination and cyclic conditions). Test results are intended for comparison of performance between aerospace hydraulic filter elements.

General information

• Status: Published (under systematic review as per ISO lifecycle).
• Publication date: March 2015 (2015-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.080 (Aerospace hydraulic systems and components).
• Edition / version: Edition 1 (2015).
• Number of pages: 7 (official ISO publication).

Key bibliographic details above are taken from the ISO bibliographic entry for ISO 14085-5:2015; some national/adopted versions may show differing page counts or cover information.

Scope

This part of ISO 14085 specifies a laboratory test method to verify the ability of an aerospace hydraulic filter element to withstand stress caused by cyclic differential pressures produced by variable flow rates. It defines imposed flow variation profiles, numbers of cycles and specified differential pressures used to simulate stages of contaminant loading. The scope explicitly excludes qualification under exact service conditions — separate, application‑specific protocols are required for that purpose.

Key topics and requirements

• Definition of a flow‑fatigue test sequence: prescribed varying flow rates, cycle counts and differential pressure levels to be applied to filter elements.
• Requirements and limits for test instrumentation, measurement of differential pressure and flow control to ensure repeatability and comparability.
• Specification that the test is comparative and simulation‑based, not a substitute for service‑replication qualification (requires bespoke testing reflecting actual operating fluid, contamination and cyclic conditions).
• Use of test data for comparative performance assessment of aerospace hydraulic filter elements within the ISO 14085 series test framework.

Typical use and users

Primary users are aerospace OEMs, filter manufacturers, independent test laboratories and procurement/qualification engineers who need repeatable comparative data on filter element durability under cyclic flow/differential pressure conditions. The standard is used as part of a suite of test methods (ISO 14085 series) to characterise element performance and to support product development, supplier comparison and contractual test requirements.

Related standards

ISO 14085-5 is part of the ISO 14085 aerospace series of test methods for hydraulic filter elements. Related parts include ISO 14085-1 (Test sequence), ISO 14085-2 (Conditioning), ISO 14085-3 (Filtration efficiency and retention capacity), and ISO 14085-4 (Verification of collapse/burst pressure rating). Note: some parts (for example ISO 14085-3) have been revised since 2015; check individual part status for the latest edition.

Keywords

hydraulic filter element; aerospace; flow fatigue; cyclic flow; differential pressure; test method; filtration; performance comparison; ISO 14085.

FAQ

Q: What is this standard?

A: ISO 14085-5:2015 is an ISO test method that specifies how to evaluate the resistance of aerospace hydraulic filter elements to flow‑induced fatigue produced by varying flow rates and cyclic differential pressures.

Q: What does it cover?

A: It covers a laboratory procedure — including prescribed varying flow profiles, cycle counts and differential pressures — to simulate stresses that can occur during contaminant loading and to compare element durability. It explicitly excludes full qualification under actual service conditions, which require bespoke protocols.

Q: Who typically uses it?

A: Aerospace OEMs, filter manufacturers, independent test houses, certification/qualification engineers and procurement teams use the standard for development, comparative testing and specification of hydraulic filter elements.

Q: Is it current or superseded?

A: ISO 14085-5:2015 is published (Edition 1, March 2015) and listed as under systematic review in the ISO lifecycle. Users should verify the current status before relying on the standard for procurement or compliance because parts of the ISO 14085 series have seen updates (for example ISO 14085-3 has a 2024 edition).

Q: Is it part of a series?

A: Yes — it is Part 5 of the ISO 14085 series (Aerospace series — Hydraulic filter elements — Test methods). The series contains multiple parts addressing sequence, conditioning, efficiency/retention, collapse/burst rating and other test methods to comprehensively characterise hydraulic filter elements.

Q: What are the key keywords?

A: Hydraulic filter element, flow fatigue, cyclic flow, differential pressure, aerospace, test method, ISO 14085.