1、 STD-BSI BS EN L7bL-ENGL 1999 1b2ibbS 078Lb09 LAT BRITISH STANDARD Rubber hoses and hose assemblies for fuel truck delivery - Specification The European standard EN 1761:19!39 has the status of a British Standard ICs 23.040.70; 75.200 BS EN 1761:1999 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMI
2、TTED BY COPYRIGHT LAW STD-BSI BS EN L7bL-ENGL 2499 = Zb24bb7 0781bL 7TL direction-of the Sector Amd. No. Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 June 1999 O BSI 06-1999 BS EN 1761:1999 Date National foreword This
3、 British Standard is the English language version of EN 1761: 1999. The UK participation in its preparation was entrusted by Technical Committee PRY b) type SD suction and delivery hose, helix reinforced. 1) electrically bonded, designated and marked “M” type; or 2) electrically conductive, using a
4、conductive rubber layer, designated and marked “fi” type. Both these types can be either 6 Materials and construction If mandrel built, pasticuiate type, release agents shal not be used. The hose shall be uniform in quality and free from porosity, air holes, foreign inclusions and other defects. The
5、 hose shal consist of the following: a) a iining of synthetic rubber resistant to hydrocarbon fuelc, b) a reinforcement of layers of woven, braided or spirally wound textile material, c) an embedded helix reinforcement (type SD only); d) two or more low resistance electrical bonding wires (type “M o
6、nly); e) an outer cover of synthetic rubber, resistant to abrasion, outdoor exposure and hydrocarbon fuels. O BSI (6-1999 STD.BS1 BS EN 17bL-ENGL 1994 M 1b24bbS 078LbL4 547 M Page 4 EN 1761:1999 Nomina bore Internai Tolerance Outside diameter diameter mm mm mm Tolerance Minimum external diameter of
7、reeling drum used in service mm mm Minimum bend radius 19 25 32 38 50 51 63 75 76 100 101 mm 19,o *,5 31,O f1,O 32,O 4470 5070 *,7 %,O f1,2 25,O 37,O 3890 51,O 51,O 67,O 6390 *,S 79,O 75,O 91,o 76,O 92,o 100,o 116,O When attaching fittings to this hose, the bonding wires shall be folded into the hos
8、e bore, positioned between the lining and the fimg tail and extended approximately IBrd of the length of the fitting tail into the bore. When tested in accordance with IS0 EN 8031 the resistance along the bonding wires, in the case of hose, or the resistance between fittings, in the case of hose ass
9、emblies, shall not exceed 1 X 102 fl per length. When obtaining elecbical continuity by this method the hose shail be marked with the symbol “M“. 2) Incorporating electrically conducting materials in the hose construction. When attachuig fittings to this hose, an adequate connection between the end-
10、fittings and the conductive layer shall be obtained. When tested in accordance with IS0 EN 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 1 X i IR per length. When obtaining electrical resi
11、stance by this method the hose shall be marked with the symbol m“. Cover 790 250 100 180 %30 *O Test methods SO 37 (dumb-bei test piece) Is0 37 (dumb-beil test piece) 8.2 of IS0 18171985, (72 h at 40 “C in liquid 3) Is0 18171985,8.2 48 h at 40 OC in liquid B) Method A of IS0 4649 Is0 188 (7 days at
12、70 OC, air-oven method) Dunng and after subjection to the hydrostatic tests as described in EN IS0 1402, the electrical Continuity of each hose shail be maintained from end to end and electrical continuity of each hose assembly shall be maintained from one couphg to the other. NOTE Electrical conduc
13、tivity in Qpe SD cannot be obtained by oniy connecting to the helix. 10 Application of tests 10.1 Hoses The minimum test frequency for production and routine tests is given in Wle 4. Qpe approved is obtained by the manufacturem supplying evidence that aJl requirements of this standard are met by his
14、 method of manufacture and hose design. The tests shall be repeated at a maximum of five year intervals, or whenever a change in the method of manufacture or materials used, occurs. Production acceptance tests are carried out on a batch basis. Routine tests are carried out on each finished length of
15、 hose. 10.2 Hose assemblies if a statutory test frequency is not specified, the end user shd establish this test frequency, tahg inb account the operation conditions. This shall generally be six monhs, but no longer than one year O BSI O-1999 Page 6 EN 1761:1999 Table 3 - Physical properties of fini
16、shed hose - Beauirementa - Unit Test method bar 15 No leakage or other signs of WealaieSS EN IS0 1402 2) Change in length: max at proof test pressure at -O$ bar (vacum) % a) type D: Oto +8 b) type SD O to +10 c) type SD -2 EN IS0 1402 3) Change in twist at proof max testpressure 8 EN IS0 1402 “ /m -
17、 - bar Nh _ - 4) Resistance to vacuum (type SD ody) at vacuum -0,s bar for 10 min (see NOTE) EN IS0 7233 No structural damage 5) Burst pressure min. 6) Adhesion between components dry min after contact with fuel 40 EN IS0 1402 EN 28033 Annex A 7) Ozone resistance at 40 OC No cracking observed under
18、X2 magnification EN 27326 relative humidity E% * 10 % ozone concentration (50 * 6) pphrr elongation 20 % Annex B 8) Fexibility at 20C at -30 OC No permanent deformation or visible structurai damage, no increase in electrid resistance, no impairment of electrical continuity and shall comply with the
19、proof pressure requirements Method B of EN 24672 9) Electrical resistance max l/assemb b) number and year of this European Standard, EN 1761:1999; c) type, e.g. D or SD, d) nominal bore, e.g. 38, e) maximum working pressure, in bar, f) symbol for the electrical conducthi, e.g. M, g) quaster and year
20、 of manufacture, e.g. 3Q-98. EXAMPLE Ltd - EN 1761:lW -Type D38 - The couplings shaii be permanently marked with the following irlfomatioIx a) name or identification of the manufacturer or assembler; b) nominal bore (legible from the inside or outside), in addition to the nominal bore, the hose inte
21、rnal diameter and externai diameter range e.g. 75 X 90-92 or the hose internal diameter range and the wali thickness shail be stated c) maximum working pressure (preferably legible from the inside). PN 10 - M-3Q-98. O BSI 6-1999 STD*BSI BS EN L7bL-ENGL 1999 lb24bb7 078LbLB 172 = Page 8 EN 1761:1999
22、Annex A (normative) %t method for adhesion between components A.l Dry adhesion Samples for type SD hose shall be cut paralie1 with the helix. Subject the hose to the adhesion test described in EN 28033 and determine the minimum due (in newtons per milimetre) for adhesion: a) between lining and reinf
23、orcement; b) between reinforcement and cover; c) between reinforcement iayers. A.2 Adhesion after contact with fuel Cut a sample of the hose to be tested approximately 300 m in length and seai one end. Fill the hose with liquid B of EO 18171985 and lightly cap the top. Condition the sample at (20 f
24、5) “C for (168 + 2) h. Determine the minimum adhesion between components as stated in A.1. Annex B (normative) Ilest method for flexibility at 20 OC Coil an empty hose at (20 f 5) OC around a test drum of extenial diameter given in Wle B.1 corresponding to the nominal bore. Uncoil and check for visi
25、ble structurai damage and permanent deformation. Check the electrid continuity is undamaged. %bIe B.l- External diameter of drum for flexibility test Annex C (normative) lkst method for flammability C.l Method Bend the hose test piece into a U-shape of raius as indicated in Fgure C.1. Fill the test
26、piece with liquid F of Is0 18171985. Expose the test piece to a naked flame nom a Bunsen burner of 10 mm pipe diameter for a period of 3 min, with the Mow to the burner shut off. The distance between the burner and test piece is indicated in Fgure C.1. C.2 Assessment The hose sample is deemed to be
27、non-fianunable if: a) it ceases to burn immediately on remo4 of the burner flame, or, b) there are no sparks visible 2 min after removal of the burner flame. On completion of the test the hose test piece shail be impervious to fluids, when visuaiiy examined. The test can be carried out on a referenc
28、e nominai bore hose, preferably 25. The resuit is applicable to the reference size and mer diameters, where materiais of construction are the same for al of the sizes. Nominal bore 19 25 32 38 50 63 75 100 Extemai diameter of test drum mm 180 230 280 360 430 460 460 690 0 BSI 081999 STD-BSI BS EN 27
29、bL-ENGL 1997 M LbZqbb7 0781bL9 O29 m Page 9 EN 1761:1999 X I 1 Cap 2 3 Hose assembly 4 5 Bending radius = 10 to 15 times the outside diameter Liquid F of IS0 1817 Propane GPG) = 50 mbar Figure C.l- Arrangement for flammability test Annex D (normative) Tkst method for security of coupling attachment
30、D.l Apparatus Test assembly, of 1 m in lenjjh, consisting of hose and end coupings. D.2 Procedure Use water as the test medium, raise the test pressure to 15 bar (1,5 ma) and hold for 2 min. Reduce the applied pressure to 0,7 bar (0,07 ma). Increase the pressure to 10 bar, hold for 2 min and examine
31、 for leakage. Reduce the applie pressure to 0,7 bar. Increase the pressure to 15 bar, hold for 2 min and examine for leakage. Reduce the applied pressure to 0,7 bar. O BSI 06-1999 BS EN 1761:1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent nati
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