ISO 4021-1977 rus PDF

Full title and description

ISO 4021:1977 — Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system. This entry refers to the original ISO international standard published in December 1977 and noted here with the suffix "rus" to indicate availability or interest in a Russian-language edition or national adoption (often published under a national designation such as СТ ИСО 4021-1977).

Abstract

The standard defines preferred and alternative methods for extracting fluid samples from hydraulic systems so that the particulate contamination measured in the sample is representative of the fluid at the sampling point. The preferred procedure is to obtain samples directly from a main flow line using an appropriate sampler; extracting a sample from a reservoir is specified only as an alternative when a suitable inline sampler cannot be fitted.

General information

• Status: Withdrawn (replaced by a later edition).
• Publication date: December 1977 (Edition 1).
• Publisher: International Organization for Standardization (ISO). Russian-language/national adoption versions may be issued by the relevant national standards body under a local designation (e.g., СТ ИСО 4021-1977) where available.
• ICS / categories: 23.100.60 (Filters, seals and contamination of fluids; hydraulic fluid power).
• Edition / version: Edition 1 (1977).
• Number of pages: 2 (original ISO 4021:1977 document).

Scope

Specifies methods for extraction of fluid samples from hydraulic power systems so that particulate contamination in the sample represents the fluid in service at the sampling point. The document covers sampling from main flowlines (preferred) and provides reservoir sampling only as an alternative when an appropriate inline sampler cannot be installed. It focuses on procedural aspects needed to avoid sampling bias and external contamination during extraction, handling and labelling of samples.

Key topics and requirements

• Preferred sampling from a main flowline to obtain a representative sample of particulate contamination.
• Alternative reservoir sampling only when a suitable inline sampler is not fitted.
• Requirements for using appropriate samplers and sample volumes to minimise contamination or loss of particles.
• Procedures to avoid introducing or removing particles during extraction (purging, isolation, flow conditions during sampling).
• Handling, sealing, identification and documentation of samples for subsequent particulate analysis.
• Guidance on when sampling methods may influence laboratory interpretation and on the need to record sampling conditions.

Typical use and users

Used by hydraulic-system maintenance engineers, contamination-control specialists, test laboratories, equipment manufacturers, and quality/inspection personnel involved in fluid contamination monitoring. The standard is applied when establishing routine sampling procedures, troubleshooting contamination-related failures, or preparing samples for particle-counting and contamination coding analysis.

Related standards

ISO 4021:1977 was superseded by ISO 4021:1992 (later editions). Relevant complementary standards include ISO 4406 (method for coding the level of contamination by solid particles) and particle-counting/membrane-filter methods such as ISO 4407 (methods for determination of particulate contamination by counting). These standards together define sampling, counting and reporting conventions for hydraulic fluid cleanliness.

Keywords

hydraulic fluid; particulate contamination; sampling; fluid sampling; contamination analysis; ISO 4021; inline sampler; reservoir sampling; fluid power; contamination control.

FAQ

Q: What is this standard?

A: ISO 4021:1977 is an International Organization for Standardization document that specified procedures for extracting fluid samples from hydraulic systems to analyse particulate contamination. The 1977 edition has since been withdrawn and superseded by a later edition.

Q: What does it cover?

A: It covers preferred methods for taking representative samples from main flowlines, an alternative reservoir-sampling method (only when inline samplers are not available), and basic precautions for handling and labelling samples to avoid bias or contamination.

Q: Who typically uses it?

A: Maintenance engineers, contamination-control and reliability specialists, test laboratories, hydraulic-equipment manufacturers, and quality assurance personnel who need standardised sampling procedures for particulate analysis.

Q: Is it current or superseded?

A: The 1977 edition is withdrawn; it was superseded by ISO 4021:1992 (a later edition). Users should refer to the most recent ISO 4021 edition or related current ISO standards for up-to-date sampling and analysis requirements.

Q: Is it part of a series?

A: It sits within the set of ISO standards for hydraulic fluid power and contamination control (ICS 23.100.60). Related documents (for particle counting, contamination coding and acceptance criteria) include ISO 4406 and ISO 4407, among others in the hydraulic contamination-control family.

Q: What are the key keywords?

A: Hydraulic fluid, particulate contamination, sampling, inline sampler, reservoir sampling, ISO 4021, contamination analysis, fluid power.