ISO 6708-1995 rus PDF

Full title and description

Ст ISO 6708-1995 (ISO 6708:1995) — Pipework components — Definition and selection of DN (nominal size). This international standard defines the DN (nominal size / nominal diameter) designation used for components of pipework systems and gives a list of preferred DN values. A Russian-language edition/translation of the ISO text is commercially available as "St ISO 6708-1995 rus".

Abstract

ISO 6708:1995 (Edition 2) cancels and replaces ISO 6708:1980. It clarifies the definition of DN when applied to pipework components (valves, fittings, flanges, etc.) and provides a list of preferred DN values to be used in standards and technical specifications that employ the DN designation system. The published document is very short (one-page technical statement).

General information

• Status: Published / Active (1995 edition confirmed in subsequent ISO reviews).
• Publication date: 22 June 1995 (ISO record shows publication in mid‑1995, commonly referenced as July 1995).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.040.01 (Pipelines and pipelines components / pipework).
• Edition / version: Edition 2 (1995). Cancels ISO 6708:1980.
• Number of pages: 1 page (short, definitive technical statement).

Scope

Defines the meaning and use of the designation "DN" (nominal size / nominal diameter) for components of a pipework system and lists preferred DN values to be applied by standards and specifications that adopt the DN system. The scope covers components (fittings, valves, flanges, etc.) rather than prescribing actual physical dimensions of every pipe product; it provides a uniform nominal-size system for referencing components across standards and industry documents.

Key topics and requirements

• Definition of DN (nominal size / nominal diameter) for pipework components.
• Rules for selection and designation of DN values for components used in pipe systems.
• Provision of a list of preferred DN values to ensure consistency across standards and product specifications.
• Replacement of the 1980 edition; establishes Edition 2 policy and short technical statement format.

Typical use and users

Used by standards writers, technical committees, mechanical and piping engineers, valve and fitting manufacturers, procurement/specification authors, and quality/regulatory personnel who need a consistent nominal-size designation across products and documents. Also consulted by translators and national standards bodies when producing or adopting national-language versions (e.g., Russian translations).

Related standards

ISO 6708:1980 — the withdrawn first edition that was superseded by ISO 6708:1995. Many regional/national standards bodies publish or adopt EN/ISO versions (EN ISO 6708) or provide national-language translations/editions that mirror the ISO text. For context, related piping and flange standards (dimension, connection, pressure‑rating standards) commonly reference DN designations defined by ISO 6708.

Keywords

DN, nominal size, nominal diameter, pipework, pipe components, fittings, valves, flanges, ISO 6708, nominal designation, sizing.

FAQ

Q: What is this standard?

A: ISO 6708:1995 is the international standard that defines the DN (nominal size / nominal diameter) designation system for pipework components and provides a list of preferred DN values. It is Edition 2 (1995) and replaces the 1980 edition.

Q: What does it cover?

A: It covers the definition and selection (preferred values) of DN as a nominal designation for components of pipe systems (valves, fittings, flanges and similar components). It is a short technical statement rather than a detailed dimensional specification.

Q: Who typically uses it?

A: Piping and mechanical engineers, component manufacturers, standards committees, procurement/specification authors, and national standards bodies or translators preparing national-language editions (including commercial Russian translations).

Q: Is it current or superseded?

A: The 1995 Edition 2 is shown on ISO records as the current published edition (it replaced the 1980 edition). ISO's catalogue shows the 1995 edition as published and subsequently confirmed in ISO review cycles; users should check the ISO catalogue or their national standards body for any more recent revisions or confirmations before relying on the standard for regulatory or procurement work.

Q: Is it part of a series?

A: ISO 6708 is a stand‑alone technical statement defining DN designation. It is commonly referenced by, and used alongside, other pipework and flange standards (EN/ISO adoptions and national standards) that require a nominal-size designation system.

Q: What are the key keywords?

A: DN; nominal size; nominal diameter; pipework components; valves; fittings; flanges; ISO 6708.