EN 26704:1991 PDF

Name: EN 26704:1991 — Automatic steam traps - Classification (ISO 6704:1982)
SKU: EN 26704:1991
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Automatic steam traps - Classification (ISO 6704:1982)

Название (английский):

EN 26704:1991

Automatic steam traps - Classification (ISO 6704:1982)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 30 сентября 1991 г.
Издание:: CEN EN 26704 edition 1 version 1
ICS:: 23.040.99

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Описание (английский):

Establishes a simple classification of the main types according to the mode of actuation of their obturation device and disregarding their details of conception and construction. Three categories of steam traps can be distinguished: mechanical traps, actuated by the level of condensate; thermostatic traps, actuated by the temperature of the condensate; thermodynamic traps, actuated by fluid dynamics.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN 26704:1991 (identical to ISO 6704:1982) provides a simple, functional classification of automatic steam traps based on the mode of actuation of their obturation device. The standard’s scope is limited to grouping the main types-without prescribing detailed design, construction or performance requirements-and it is intended to standardize terminology and classification across industry and standards bodies.

Key topics

Purpose: establish a clear, technology‑neutral steam trap classification according to actuation method.

Main categories:

Mechanical traps - actuated by condensate level (e.g., closed float, open-top/bucket float, inverted float).
Thermostatic traps - actuated by condensate temperature (e.g., vapour‑pressure traps, bimetallic/thermoelastic traps, liquid/solid expansion traps).
Thermodynamic traps - actuated by fluid dynamics and pressure differences (e.g., obturator traps, impulse/piston traps, labyrinth orifice traps).

Key concepts and terms: automatic steam trap, obturator, seat, pressure chamber, orifice, fluid flow direction, condensate behaviour.

References to related ISO standards: ISO 6552 (terminology), ISO 6553 (marking), ISO 6554 (flanged trap dimensions).

Diagrams: the standard uses schematic sketches to illustrate each trap type and its operating principle.

Applications

EN 26704:1991 is primarily a classification and reference document that supports practical use cases such as:

Specifying trap type in steam system design and piping & instrumentation diagrams (P&IDs).

Communicating requirements between engineers, manufacturers and procurement teams when selecting traps for steam distribution, process heating, HVAC and industrial steam systems.

Training and documentation for maintenance and reliability teams to recognize trap families (mechanical, thermostatic, thermodynamic) and their typical operating behavior.

Harmonizing national and international standards references used by standards committees, certification bodies and technical authors.

Related standards

ISO 6704:1982 - Automatic steam traps - Classification (original international text)

ISO 6552, ISO 6553, ISO 6554 - referenced for terminology, marking and dimensional guidance

National adoptions (example: SIST EN 26704:2000) reflect CEN/ISO transposition

This classification-focused standard is a practical reference for correctly identifying and specifying automatic steam traps by actuation principle, improving clarity across procurement, design and maintenance workflows in steam-using industries.

EN 26704:1991 PDF

Abstract

Похожие стандарты

Overview

Key topics

Applications

Who uses this standard

Related standards

Технические детали

ISO 6704:1982

Automatic steam traps — Classification

SIST ISO 6552:2000

Automatic steam traps -- Definition of technical terms

SIST EN ISO 6553:2017

Automatic steam traps - Marking (ISO 6553:2016)

ISO 6554:1980

Flanged automatic steam traps — Face-to-face dimensions