ISO 4021:1992

Name: ISO 4021:1992 — Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system
SKU: ISO 4021:1992
Price: 25 EUR
Availability: InStock

Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system

Название (английский):

ISO 4021:1992

Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 21 октября 1992 г.
Издание:: ISO IS 4021 edition 2 version 1
ICS:: 23.100.60

Тип поставки:

Full version25 €Ask AI2 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 рабочий день

Цена:25 €

Описание (английский):

The preferred method is to extract fluid samples from a main flowline in such a manner that the particulate contaminant in the sample is representative of the fluid flowing at the point of sampling. An alternative method is to extract a sample from the reservoir, but this method should only be used if a suitable sampler is not fitted.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4021:1992 is an international standard developed by the International Organization for Standardization (ISO) that specifies the preferred methods for extracting fluid samples from hydraulic systems in operation for particulate contamination analysis. The standard focuses on obtaining representative samples from operating hydraulic fluid power systems to ensure accurate assessment of particulate contamination, which is critical for system reliability and maintenance.

This second edition supersedes the original 1977 version, incorporating technical updates for improved sampling accuracy. The primary method involves extracting samples directly from the main flowline under turbulent flow conditions, ensuring the particulate content reflects the fluid in circulation. An alternative method allows sampling from the system’s reservoir only when direct line sampling is not feasible.

Key Topics

Sampling Methods:

Main flowline sampling: The preferred practice involves using a specialized sampler installed in the main hydraulic circuit where fluid flow is turbulent, providing the most representative sample of particulate contamination.
Reservoir sampling: Used only if the main line sampling valve cannot be fitted. Emphasizes careful selection of sampling location within the reservoir to minimize external contamination and ensure sample validity.

Sampler and Equipment Requirements:

The sampling valve must be compatible with fluid type and operating pressure.
A controlled minimum flow rate (ideally 500 ml/min; minimum 100 ml/min) must be maintained to avoid altering contamination levels.
Internal sampler dimensions and tubing specifications must prevent particle accumulation and contamination.
Equipment must be easy to operate, leak-proof, and allow repeated, reproducible sampling.

Operating Procedures:

Hydraulic systems should be operated at normal conditions before sampling to evenly distribute particulate contaminants.
Purging lines before collecting the representative sample to avoid dilution or contamination from stagnant fluid.
Use of pre-cleaned, sealed sample bottles compliant with ISO 3722 ensures sample integrity.
Detailed labeling of samples including reference number, fluid type, sampling date/time, circuit parameters, and sampling method.

Flow Conditions:

Turbulent flow conditions (Reynolds number typically >2300) at the sampling point are critical to obtain undisturbed particulate distributions in the fluid.
The Reynolds number calculation is provided to verify turbulent flow, supporting correct sampler positioning.

Safety Considerations:

Sampling high-pressure hydraulic fluid demands trained personnel due to risks such as fluid injection injuries. Immediate medical attention is advised if skin penetration occurs.

Applications

ISO 4021:1992 is essential for industries relying on hydraulic fluid power transmission-such as aerospace, manufacturing, mobile machinery, and energy sectors-to:

Monitor hydraulic fluid cleanliness levels in real-time, enhancing predictive maintenance.

Detect particulate contamination that could cause system wear, failures, or reduced efficiency.

Support quality control and verify filtration effectiveness in hydraulic systems.

Facilitate standardized fluid sampling procedures to enable consistent contamination analysis across equipment and facilities.

Implementing this standard contributes to extending hydraulic system life, decreasing downtime, and reducing maintenance costs by ensuring contamination control strategies are based on accurate, representative fluid samples.

Related Standards

ISO 3722: Specifies requirements for cleanliness and testing of sample bottles used in hydraulic fluid sampling.

ISO 5598: Provides vocabulary and key terms related to hydraulic and pneumatic systems, including contamination and sampling terminology referenced by ISO 4021.

ISO 4406: Codes and categorizes particulate contamination levels in hydraulic fluids, often used in conjunction with ISO 4021 sampling methods.

Industry-specific hydraulic fluid contamination standards: May reference ISO 4021 for fluid sampling procedures within tailored maintenance and testing protocols.

By following ISO 4021:1992, organizations working with hydraulic transmissions ensure systematic, reliable extraction of fluid samples that accurately represent particulate contamination. This enables effective monitoring and control to maintain system integrity and performance.

ISO 4021:1992

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

ISO 3722:1976

Hydraulic fluid power — Fluid sample containers — Qualifying and controlling cleaning methods

ISO 5598:2008

Fluid power systems and components — Vocabulary

BS ISO 4406:2021

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