ISO 14085-4-2015 PDF

Full title and description

St ISO 14085-4-2015 — Aerospace series — Hydraulic filter elements — Test methods — Part 4: Verification of collapse/burst pressure rating. Specifies a laboratory method to verify the collapse or burst differential-pressure capability of hydraulic filter elements used in aerospace hydraulic fluid-power systems by applying contaminant-laden flow until collapse/burst or the target differential pressure is reached.

Abstract

This part of ISO 14085 defines a repeatable test to determine the collapse/burst pressure rating of aerospace hydraulic filter elements. The procedure establishes the element’s ability to withstand a designated differential pressure in the intended flow direction; it can be continued from an efficiency test sequence but is not intended to replicate all in-service conditions. Test data are intended for comparative evaluation of filter element performance.

General information

• Status: Published.
• Publication date: March 2015 (2015-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.080 (Aerospace engineering / hydraulic systems).
• Edition / version: Edition 1, 2015.
• Number of pages: 9 (ISO published length).

Scope

This standard applies to hydraulic filter elements intended for aerospace hydraulic fluid-power systems and specifies a laboratory verification method for the collapse/burst differential-pressure rating. It describes the test conditions and sequence to flow contaminated fluid through the element until collapse/burst occurs or the specified differential pressure is reached; it is intended for comparative laboratory evaluation rather than to qualify an element for a specific in-service environment.

Key topics and requirements

• Definition of collapse/burst pressure verification procedure for aerospace hydraulic filter elements.
• Test arrangement and measurement of differential pressure while flowing contaminant-laden fluid through the element.
• Guidance for performing the collapse/burst test in conjunction with filtration-efficiency testing (can follow ISO 14085-3 procedures).
• Statement that the method is for laboratory comparison and is not a service-condition qualification protocol.
• Reporting requirements for test results so data can be used to compare element performance.

Typical use and users

Used by aerospace hydraulic filter manufacturers, independent test laboratories, OEMs (aircraft and hydraulic-system manufacturers), procurement and quality engineers, and certification bodies that need standardized, repeatable collapse/burst data to compare product performance and support component selection.

Related standards

Part of the ISO 14085 series (Aerospace series — Hydraulic filter elements — Test methods). Relevant related parts include ISO 14085-1 (test sequence), ISO 14085-2 (conditioning), ISO 14085-3 (filtration efficiency and retention capacity), ISO 14085-5 (resistance to flow fatigue) and ISO 14085-6 (initial cleanliness level). These adjacent parts define sequencing, conditioning and other performance tests that complement the collapse/burst verification in Part 4.

Keywords

hydraulic filter, aerospace, collapse pressure, burst pressure, differential pressure, filter element testing, ISO 14085, test method, filtration, retention capacity

FAQ

Q: What is this standard?

A: ISO 14085-4:2015 is the international test-method standard that specifies how to verify the collapse or burst differential-pressure rating of aerospace hydraulic filter elements in a laboratory setting.

Q: What does it cover?

A: It covers the test procedure, test conditions and reporting needed to determine whether a filter element will collapse or burst at a given differential pressure when contaminated fluid is flowed through it; it is intended for comparative laboratory evaluation rather than full in-service qualification.

Q: Who typically uses it?

A: Filter manufacturers, aerospace OEMs, independent test laboratories, quality and procurement teams, and certification bodies use this standard to obtain consistent collapse/burst performance data.

Q: Is it current or superseded?

A: ISO 14085-4 was published in March 2015 and is listed as a published part of the ISO 14085 series; consult the ISO catalogue or national standards bodies for the latest review or revision status before relying on the text for procurement or certification.

Q: Is it part of a series?

A: Yes — it is Part 4 of the ISO 14085 series (Aerospace series — Hydraulic filter elements — Test methods). Other parts address test sequence, conditioning, filtration efficiency, flow-fatigue resistance and initial cleanliness.

Q: What are the key keywords?

A: Hydraulic filter element, collapse pressure, burst rating, differential pressure test, aerospace hydraulic systems, test method, ISO 14085.