ISO 1608-2:1989 PDF

Name: ISO 1608-2:1989 — Vapour vacuum pumps — Measurement of performance characteristics — Part 2: Measurement of critical backing pressure
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Vapour vacuum pumps — Measurement of performance characteristics — Part 2: Measurement of critical backing pressure

Название (английский):

ISO 1608-2:1989

Vapour vacuum pumps — Measurement of performance characteristics — Part 2: Measurement of critical backing pressure

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 3
Дата публикации:: 30 ноября 1989 г.
Издание:: ISO IS 1608 edition 2 version 1
ICS:: 23.160

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Описание (английский):

The considered method of measurement deals with vapours jet vacuum pumps, diffusions pumps and diffusion-ejector pumps. The dependence of the performance of these pumps on the backing pressure can only be completely described be means of a curve relating the inlet and backing pressure over the range of operation. The recommended test dome and the principle of the test equipment are illustrated.

Abstract

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Overview

ISO 1608-2:1989 is an international standard published by the International Organization for Standardization (ISO) that specifies the method for measuring the critical backing pressure of vapor vacuum pumps. This measurement is essential for evaluating the performance characteristics of key types of vapor vacuum pumps, including vapor jet vacuum pumps, diffusion pumps, and diffusion-ejector pumps. The standard ensures that performance testing is conducted uniformly across manufacturers and laboratories, allowing reliable, comparable data on pump operation under varying pressure conditions.

The critical backing pressure is the threshold back pressure at which the pump’s performance begins to deteriorate significantly, making it a crucial parameter in vacuum system design and operation.

Key Topics

Scope and Types of Pumps Covered ISO 1608-2 focuses on vapor vacuum pumps, specifically:

Vapor jet vacuum pumps
Diffusion pumps
Diffusion-ejector pumps These pumps are characterized by their reliance on vapor jets or diffusion processes to achieve vacuum conditions.

Critical Backing Pressure Definition

The critical backing pressure is the lowest backing pressure causing a specified increase (minimum 10%) in the inlet pressure, indicating a decline in pump efficiency.
It is measured under different throughput conditions, such as “no-load” (zero gas admitted) and “full-load” (maximum stable throughput).

Test Equipment and Setup

A test dome connected to the pump inlet with specific dimensions to admit a controlled gas flow.
A controllable gas inlet valve to regulate gas flow into the dome.
A backing pump with a gas admittance valve controlling the backing pressure at the outlet.
Precision gauges to measure pressures at critical points-at the test dome and along the backing line.
Conditions such as temperature and pump input power must be controlled and documented for consistency.

Measurement Procedure

The pump is operated under thermal equilibrium and vacuum conditions before starting the test.
Gradual increments of backing pressure are applied while monitoring the inlet pressure to identify the critical point where performance degrades.
Measurements are recorded to graph the relationship between inlet pressure and backing pressure, enabling full characterization of pump behavior over the operating range.

Applications

Vacuum System Design Accurate measurement of critical backing pressure helps engineers design vacuum systems with appropriate backing pumps and operating parameters, enhancing reliability and efficiency in processes requiring vapor vacuum pumps.

Performance Specification and Quality Control Manufacturers use ISO 1608-2 methods to produce standardized performance data, ensuring consistency across products and enabling users to compare models effectively.

Research and Development R&D teams leverage critical backing pressure data to optimize pump designs, adapt to different fluids, and improve operational stability under various load conditions.

Process Industries Industries such as semiconductor manufacturing, chemical processing, and materials science rely on precise vacuum technology standards to maintain process control and product quality.

Related Standards

ISO 1608-1:1989 – Measurement of volume rate at flow (pumping speed) of vapor vacuum pumps. This part complements ISO 1608-2 by defining methods for flow rate performance measurement.

ISO 1608-3 – Measurement of gas flow rates in vapor vacuum pumps. It addresses additional performance characteristics to provide a comprehensive understanding of pump operation.

ISO/TC 112 – Vacuum Technology Committee The technical committee responsible for developing ISO 1608 series standards, working closely with international experts to address evolving vacuum technology measurement needs.

Summary

ISO 1608-2:1989 defines critical procedures to measure the critical backing pressure of vapor vacuum pumps, ensuring uniform, reproducible, and comparable performance data across the industry. By standardizing test methods, equipment requirements, and reporting protocols, the standard supports improved vacuum system design, pump manufacturing, and quality control processes crucial to advanced industrial applications. Understanding and applying ISO 1608-2 facilitates reliable vacuum technology performance and contributes to innovation and operational excellence in vacuum-dependent sectors.

ISO 1608-2:1989 PDF

Abstract

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Overview

Key Topics

Applications

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Summary

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