ISO 7842-1988 PDF
Name in English:
St ISO 7842-1988
Name in Russian:
Ст ISO 7842-1988
Original standard ISO 7842-1988 in PDF full version. Additional info + preview on request
Full title and description
Automatic steam traps — Determination of discharge capacity — Test methods. Specifies test procedures for measuring the discharge (flow) capacity of automatic steam traps; published in English and French (Purgeurs automatiques de vapeur d'eau — Détermination du débit — Méthodes d'essai).
Abstract
This International Standard provides two test methods to determine the discharge capacity of automatic steam traps (equipment intended to discharge condensate while retaining steam). The procedures define test apparatus, test conditions and reporting requirements and are intended for traps manufactured or assessed in accordance with related product standards.
General information
- Status: Withdrawn / superseded.
- Publication date: December 1988 (edition 1, published 1 December 1988).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 23.060.01 (Valves in general).
- Edition / version: Edition 1 (1988).
- Number of pages: 11 pages (official published document).
Scope
The standard covers laboratory test methods for determining the discharge capacity of automatic steam traps. It specifies two distinct test procedures, required instrumentation and conditions (pressure, temperature, condensate loading and measurement technique), and the format for reporting test results. The scope is focused on traps covered by related product standards (for example traps conforming to ISO 6552) rather than on installation practice.
Key topics and requirements
- Definition of two standardized test methods for measuring trap discharge capacity (including steady-state and dynamic conditions).
- Required test apparatus and instrumentation: trap test rig, pressure and temperature measurement, flow/condensate measurement devices and calibration requirements.
- Specified test conditions and procedures: inlet pressure, backpressure, condensate load ranges and temperature control.
- Data recording and reporting: how to present discharge curves, acceptance criteria, and required test report items.
- Reference to related product standards and conformity with trap design classifications addressed by ISO product standards.
Typical use and users
Used by manufacturers of automatic steam traps for product development and factory testing, independent testing laboratories for performance verification, procurement and quality departments that need objective performance data, and engineering teams responsible for selecting traps for steam systems. Also referenced by standards committees and certification bodies when assessing trap performance.
Related standards
Replaced/superseded by ISO 5117:2023 (Automatic steam traps — Production and performance characteristic tests). The standard also references product and dimensional standards for steam traps (for example ISO 6552 where applicable) and national/adopted equivalents that harmonize trap testing and performance reporting.
Keywords
automatic steam trap, steam trap testing, discharge capacity, test methods, condensate discharge, ISO 7842, ISO 5117, trap performance, valves, steam system testing.
FAQ
Q: What is this standard?
A: ISO 7842:1988 is an International Standard that defined laboratory test methods to determine the discharge (flow) capacity of automatic steam traps.
Q: What does it cover?
A: It covers two specific test methods, required test equipment and instrumentation, test conditions (pressure, temperature, condensate load), and the required test report format for reporting trap discharge performance.
Q: Who typically uses it?
A: Manufacturers, independent test laboratories, procurement and quality engineers, system designers and standards committees concerned with steam trap performance and verification.
Q: Is it current or superseded?
A: ISO 7842:1988 has been withdrawn and is superseded by ISO 5117:2023; the withdrawal became effective in June 2023 when the newer standard was published.
Q: Is it part of a series?
A: It is one of ISO standards addressing steam trap testing and performance; related documents include product-specific standards (e.g., ISO 6552 referenced for trap conformity) and the later consolidated/updated test and production/performance standard ISO 5117:2023.
Q: What are the key keywords?
A: Automatic steam trap, discharge capacity, test methods, condensate, trap performance, flow measurement, ISO 7842, ISO 5117.