BS ISO 11237-1 pdf download – Rubber hoses and hoseassemblies — Wire-braid-reinforcedcompact types for hydraulic applications ——Specification —— Part 1: Oil-based fluid applications.
6.3 Resistance to impulse
6.3.1 The impulse test shall be in accordance with ISO 6803. The test-fluid temperature shall be 100 C.
6.3.2 For type I SC hoses, when tested at an impulse pressure equal to 125 % of the maximum working pressure. the hose shall wtttistand a minimum of 150 000 impulse cycles.
For type 2SC. R16 and R17 hoses. when tested at an impulse pressure equal to 133% 04 the maximum working pressure, the hose shall withstand a minimum of 200 000 impulse cycles.
6.3.3 There shall be no leakage or other malfunction before reaching the specified number of cycles.
634 This test shall be considered a destructive test and the test piece shall be destroyed after the test.
6.4 Leakage of hose assemblies
When tested in accordance with ISO 1402, there shall be no leakage or evidence of failure. This test shall be considered a destructive test and the test piece shall be destroyed after the test.
6.5 Cold flexibility
When tested in accordance with method B of ISO 4672:1997 at a temperature of —40 C. there shall be no cracking of the lining or cover. The test piece shall not leak or crack when subec1ed to a proof-pressure test In accordance with ISO 1402 after regaining ambient temperature.
6.6 AdhesIon between components
When determined in accordance with ISO 8033, the adhesion between lining and reinforcement, and between cover and reinforcement, shall not be less than 2,5 kN.n for type ISC and 2SC hoses, and not less than 1.8 kN/ni for type R16 and R17 hoses.
Test pieces shall be type 5 for lining and reinforcement and type 2 or type 6 for cover and reinforcement as described in Table 1 of ISO 8033:1991,
NOTEType R16 and R17 are not subjected to this test.6.8Abrasion resistance
When determined in accordance with ISO 6945, with a vertical force of (25±0,5) N, the loss in mass after2 000 cycles shall not be grealer than 0.5 g.
NOTE Type R16 and R17 are not subjected lo this test.6.9Fluid resistance
6.9.1 Test pieces
The fluid resistance tests shall be carried out on moulded sheets of lining and cover compound of cure stateequivalent to that of the hose and having a minimum thickness of 2 mm.
6.9.2Oil resistance
For type 1SC and 2SC, when determined in accordance with lSO 1817, by immersion in lIRM 903 oil for 168 hat a temperature of 100 C, the percentage change in volume of the lining &Vioo shall be between 0 and+25 %.
For type R16 and R17, when determined in accordance with ISO 1817, by immersion in lRM 903 oil for 72 hat a temperature of 100 C, the percentage change in volume of the lining 4Voo shall be between 0 and+100 %.
For types 1SC and 2sC,when determined in accordance with IS0 1817, by immersion in lRM 903 oil for168 h at a temperature of 70 “C, the percentage change in volume of the cover △V4oo shall be between 0 and+100 %.
BS ISO 11237-1 pdf download – Rubber hoses and hoseassemblies — Wire-braid-reinforcedcompact types for hydraulic applications ——Specification —— Part 1: Oil-based fluid applications
