ISO 7233:2021 ゴムとプラスチックのホースとホースアセンブリ—真空に対する耐性の決定 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Rubber and plastics hoses and hose assemblies, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 218, Rubber and plastics hoses and hose assemblies, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fifth edition cancels and replaces the fourth edition (ISO 7233:2016), which has been technically revised. The main changes compared to the previous edition are as follows:

• hose assembly has been added in the text;
• a statement regarding change in length, as mentioned in Method C, has been added.

Introduction

Vacuum testing is applied to hoses or hose assemblies to determine whether they will withstand the differential pressure encountered in service resulting from reduced pressure within the hose or hose assembly.

1 Scope

This document specifies three methods for determining the resistance to vacuum of hoses and hose assemblies manufactured from plastic or rubber. Applicable dimensions of hoses for each method are as follows:

• method A for hoses of nominal size up to and including 80;
• method B for hoses of nominal size greater than 80;
• method C for hoses of all dimensions.

If not otherwise specified in the product standard, method C can be used as an alternative to methods A and B.

Methods A and B can also be used to check the adhesion of the lining to the reinforcement (delamination) in a length of hard-wall hose or hose assembly.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8330 apply.

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