ISO 19879:2021 Metallic tube connections for fluid power and general use — Test methods for hydraulic fluid power connections

标准简介

Metallic tube connections for fluid power and general use — Test methods for hydraulic fluid power connections由国际标准化组织于2021-03发布，适用于世界范围。

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标准部分原文

Metallic tube connections for fluid power and general use — Test methods for hydraulic fluid power connections

1 Scope

This document specifies uniform methods for the testing and performance evaluation of metallic tube connections, stud ends for ports and flange connections for use in hydraulic fluid power applications. This document does not apply to the testing of hydraulic quick-action couplings, which is covered by ISO 18869.

Tests outlined in this document are independent of each other and document the method to follow for each test. See the appropriate component International Standard for indications of which tests to conduct and for performance criteria.

For qualification of the connector, the minimum number of samples specified in this document is tested, unless otherwise specified in the relevant connector standard or as agreed upon by the manufacturer and the user.

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.

ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between 10 IRHD and 100 IRHD

ISO 3448, Industrial liquid lubricants — ISO viscosity classification

ISO 3601-3, Fluid power systems — O-rings — Part 3: Quality acceptance criteria

ISO 5598, Fluid power systems and components — Vocabulary

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method

ISO 6605, Hydraulic fluid power — Test methods for hoses and hose assemblies

ISO 6743-4, Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H (Hydraulic systems)

ISO 10763, Hydraulic fluid power — Plain-end, seamless and welded precision steel tubes — Dimensions and nominal working pressures

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww. iso .org/ obp

— IEC Electropedia: available at http:// www.e lectropedia. org/

4 General requirements

WARNING — Some of the tests described in this document are considered hazardous. It is, therefore, essential that, in conducting these tests, all appropriate safety precautions be strictly adhered to. Attention is drawn to the danger of burst, fine jets (which can penetrate the skin) and energy release of expanding gases. To reduce the hazard of energy release, bleed air out of test specimens prior to pressure testing. Tests shall be set up and performed by properly trained personnel, utilizing appropriate personal protective equipment (PPE).

4.1 Test assemblies

All components tested shall be in the final form, including annealed nuts, as required for brazed components. Unless otherwise specified in the respective connector standard, Type 1 test assemblies shall be as shown in Figure 1 for tube connections, and Type 2 test assemblies shall be as shown in Figure 2 for male stud ends. Alternatively, in order to test the connector to its full capability, use of the metallic tube may be omitted for burst and cyclic endurance tests, and different configurations with similar capability may be combined in a test assembly Type 3, as shown in Figure 3. Type 4 test assemblies for flange connectors shall be as shown in Figure 4. Test assemblies shall conform to the relevant requirements given in Table 1.

Table 1 — Requirements for test assemblies

Part code Part name Description and further information

The type of stud end, tube-connector end and sealing method A Straight stud connector

is optional but shall be recorded in the test report.

The required tube wall thickness shall be selected according to the working pressure rating of the respective connec-

tor. The working pressure of the tube in accordance with B Metallic tube

ISO 10763 shall be equal to or slightly greater than the work-

ing pressure of the respective connector. The length of the tube shall be five times the tube outside diameter plus 50 mm.

Shaped connector, with C —

swivel, if applicable

D Blanking end (cap or plug) —

Shaped connector with E —

adjustable stud end

F Flange connector —

G Sealing e.g. O-ring.

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