ISO 23181:2007 PDF

Name: ISO 23181:2007 — Hydraulic fluid power — Filter elements — Determination of resistance to flow fatigue using high viscosity fluid
SKU: ISO 23181:2007
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Hydraulic fluid power — Filter elements — Determination of resistance to flow fatigue using high viscosity fluid

Название (английский):

ISO 23181:2007

Hydraulic fluid power — Filter elements — Determination of resistance to flow fatigue using high viscosity fluid

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 6 августа 2007 г.
Издание:: ISO IS 23181 edition 1 version 1
ICS:: 23.100.60

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Описание (английский):

ISO 23181:2007 specifies a method for determining the resistance of a hydraulic filter element to flow fatigue when subjected to high viscosity fluid, using a uniformly varying flow rate up to a predetermined terminal differential pressure and a controlled waveform. It establishes a method for verifying the ability of a filter element to withstand the flexing caused by cyclic differential pressures induced by a variable flow rate.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 23181:2007 - "Hydraulic fluid power - Filter elements - Determination of resistance to flow fatigue using high viscosity fluid" specifies a laboratory method to verify the flow fatigue resistance of hydraulic filter elements when exposed to high viscosity fluid. The standard defines a controlled cyclic differential-pressure waveform and a uniformly varying flow rate to simulate the flexing stresses caused by variable system flow (for example, mobile equipment start‑up). Acceptance is based on surviving the required number of cycles and passing a collapse/burst test afterwards.

Key topics and requirements

Test objective: Determine a filter element’s ability to resist structural failure from cyclic differential pressures (flow fatigue).

Test fluid: High viscosity fluid - viscosity ≥ 198 mm²/s at 40 °C (ISO VG 220, per ISO 3448). Ensure compatibility with filter materials (ISO 2943) and fluid cleanliness of 18/16/13 or cleaner (ISO 4406).

Pre-tests: Fabrication integrity (ISO 2942) - elements failing ISO 2942 are disqualified.

Measurement and apparatus: Flow fatigue cycle test stand, pressure sensors with sufficient frequency response, flow meter, cycle-counting device, and test filter housing preventing bypass.

Waveform and cycle rate: Differential‑pressure‑versus‑time waveform per Figure 1 in the standard; cycle frequency selected between 0.2 Hz and 1 Hz (±10% tolerance).

Procedure highlights:

Measure housing Δp vs flow (25–100% rated flow), then assembly Δp vs flow with element installed.
Compute element Δp curve, choose flow to reach predetermined maximum element differential pressure.
Run the specified number of cycles while controlling assembly differential pressure (allowable tolerances listed).
After cycling, perform collapse/burst test per ISO 2941 (bubble point exception noted).

Acceptance: Element accepted if it passes the collapse/burst test after flow fatigue cycling.

Measurement tolerances: Flow ±2% (reading) with ±10% allowed variation; differential pressure ±2% with ±10% variation; temperature ±1 °C reading with ±3 °C allowed; cycle rate ±10%.

Applications and users

Hydraulic filter manufacturers for product qualification and design verification.

Test laboratories and quality control teams performing standardized filter endurance testing.

Hydraulic system designers and OEMs (mobile and industrial equipment) who need to simulate start‑up and variable‑flow conditions.

Purchasing/specification engineers who require objective acceptance criteria for filter elements.

Practical uses include validating filter durability before multi‑pass cleanliness testing and assessing performance under high‑viscosity conditions typical of cold starts or heavy lubricants.

Related standards

ISO 2941 - collapse/burst verification (used after flow fatigue)

ISO 2942 - fabrication integrity and first bubble point

ISO 2943 - material compatibility with fluids

ISO 3448 - ISO viscosity classification (ISO VG 220)

ISO 4406 - contamination coding

ISO 3724 - related flow fatigue method (particulate contaminant); round‑robin tests show differing results compared to ISO 23181

For test reports, ISO 23181:2007 provides an identification statement to declare conformity when the method is applied.

ISO 23181:2007 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 3448:1975

Industrial liquid lubricants — ISO viscosity classification

SIST EN ISO 294-3:2020

Plastics - Injection moulding of test specimens of thermoplastic materials - Part 3: Small plates (ISO 294-3:…

BS ISO 4406:2021

Hydraulic fluid power. Fluids. Method for coding the level of contamination by solid particles.

BS EN ISO 294-2:2018

Plastics. Injection moulding of test specimens of thermoplastic materials. Small tensile bars.

SIST EN ISO 294-1:2017

Plastics - Injection moulding of test specimens of thermoplastic materials - Part 1: General principles, and…

ISO 3724:2007

Hydraulic fluid power — Filter elements — Determination of resistance to flow fatigue using particulate conta…