BS/EN 1762-2017 pdf download.Rubber hoses and hose assemblies for liquefied petroleum gas, LPG (liquid or gaseous phase), and natural gas up to 25 bar (2,5 MPa) Specification.
8.1 General
Electrical resistance of hose and hose assemblies shall be obtained by one of the four following methods:
8.2 Textile reinforced hoses with bonding wires
Incorporating two low resistance bonding wires into the hose construction. These shall be spirally applied and shall be positioned in such a way to cross uniformly.
When attaching fittings to this hose, the bonding wires shall be folded into the hose bore, positioned between the lining and the fitting tail and extended approximately 1/3rd the length of the fitting tail into the bore.
When tested In accordance with EN ISO 8031 the resistance along the bonding wires, in the case of hose, or the resistance between fittings, in the case of hose assemblies, shall not exceed 1 x 102 II per length. When obtaining electrical continuity by this method the hose shall be marked with the symbol M.
8.3 Textile reinforced hoses with conducting materials
Incorporating electrically conducting materials in the hose construction. When attaching fittings to this hose, an adequate connection between the end-fittings and the conductive layer shall be obtained.
When tested in accordance with EN ISO 8031. the resistance along the conductive layer, in the case of hose or the resistance between the fittings, in the case of hose assemblies, shall not exceed I x 106 fi per length, When obtaining electrical resistance by this method the hose shall be marked with the symbol fl.
8.4 Wire helix reinforced hoses
8.4.1 Grade M-hoses (see 8.2)
All incorporated metal parts like steel braiding and steel wire helix shall be electrically connected with the fittings. Resistance between fittings shall not exceed 10 a per length, when tested in accordance with EN ISO 8031.
8.4.2 Grade a-hoses (see 8.3)
All incorporated metal parts shall not be connected with the fittings. Resistance between fittings shall not exceed 106 fl per length, when tested in accordance with EN ISO 8031.
During and after subjection to the hydrostatic tests as described in EN ISO 1402, the electrical continuity of each hose shall be maintained from end to end and electrical continuity of each hose assembly shall be maintained from one coupling to the other.
Electrical conductivity in Types SD. SD-LTS and SD-LTR cannot be obtained by only connecting to the helix. Full-length anti-static wire should be spirally applied continuously
8.5 Hose assemblies that are required to be discontinuous
Hose assemblies for this application are required to have an insulating layer between the metallic reinforcement/helix and either one of both end-couplings. When tested in accordance with EN ISO 8031 the resistance between the end couplings shall > 2.5 x 10 ohms/Assembly:
9 Type testing
Type rests are carried out by rue manufacturer to supply evidence that all the material, construction and test requirements of this standard, have been met by the method of manufacture and hose design. Type tests shall be carried out a minimum of every five years or whenever a change of design, manufacture or materials occurs.
10 Frequency of testing
Type and routine tests are specified in Annex B.
Type tests are those tests required to obtain proof that the design and materials meet all requirements of this document.
Routine tests are those tests that shall be carried out on all hoses or hose assemblies prior to despatch.
Production acceptance tests are those tests, specified in Annex C, which should be carried out by the manufacturer to control the quality of this manufacture. The frequency specified in Annex C is a guide being an informative Annex only.
11 Marking
11.1 Hoses
Each length of hose shall be legibly and durably marked continuously along its length on the outer cover, with the following information in lettering at least 5 mm high:
a) a manufacturer’s name or identification e.g. XXXX;
b) number and year of this European Standard. EN 1762:2017;
c) type e.g. D;
d) nominal bore, e.g. 38;
e) maximum working pressure in bar e.g. 25;
f) symbol for the electrical conductivity, e.g. M; (grade)
g) quarter and year of manufacture, e.g. 3Q-1 6.BS/EN 1762-2017 pdf download.