BS ISO 2928:2021 pdf download – Rubber hoses and hose assemblies for liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas up to 2,5 MPa (25 bar) — Specification
This document specifies requirements for rubber hoses and rubber hose assemblies used for the transfer of liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas and designed for use at working pressures ranging from vacuum to a maximum of 2,5 MPa (25 bar) within the temperature range −30 °C to +70 °C or, for low-temperature hoses (designated -LT), within the temperature range −50 °C to +70 °C.
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 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between 10 IRHD and 100 IRHD ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1382, Rubber — Vocabulary ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 4649, Rubber, vulcanized or thermoplastic — Determination of abrasion resistance using a rotating cylindrical drum device ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of hoses and the lengths of hose assemblies
ISO 6179:2017, Rubber, vulcanized or thermoplastic — Rubber sheets and rubber-coated fabrics — Determination of transmission rate of volatile liquids (gravimetric technique)
ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of suction resistance
ISO 7326, Rubber and plastics hoses — Assessment of ozone resistance under static conditions ISO 8031, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance and conductivity
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
— for types SD, SD-LTR and SD- LTS only, shall additionally have an embedded helical wire reinforcement.
— for type SD-LTR only, an internal, non-embedded helical wire, suitable for−50 °C. For pricked hoses, the material shall be stainless steel. Assemblies shall incorporate metallic fittings attached to the hose by the assembler or built in by the manufacturer. In order to produce the required electrical properties, the couplings should be attached in accordance with Clause8. Chlorinated materials shall not be used in contact with any stainless-steel materials.
6.1 Nominal size, inside diameter, outside diameter, minimum bend radius For hoses without built-in couplings, and when measured in accordance with method A of ISO 10619-2:2017, the inside diameter and outside diameter and their tolerances shall conform to the values given in Table 1 or Table 2, depending on the type. For hoses with built-in couplings, the outside diameters of Table 1 and Table 2 shall not apply. When tested by the method described in ISO 10619-1, the value of the minimum bend radius shall conform to the values given in Table 1 or Table 2, depending on the type.
6.2 Minimum thickness of lining and cover
The minimum thickness of both the lining and the cover of hoses shall be 1,6 mm. They shall be tested in accordance with ISO 4671.
The concentricity based on a total indicator reading shall be 1 mm for hoses of a nominal size 9 to 76 and 1,5 mm for hoses of nominal size 80 to 200. They shall be tested in accordance with ISO 4671.
6.4 Tolerances in length
The tolerances on the measured length of hoses and hose assemblies shall be ±1 %.
7 Physical properties
The physical properties of the compounds used for the lining and cover shall conform to the values given in Table 3, when determined by the methods listed in Table 3.
Tests shall be carried out on samples taken either from the hose or from separately vulcanized sheets, vulcanized to the same cured state as the production hoses.BS ISO 2928 pdf download.