BS EN 15889:2011 pdf download

BS EN 15889:2011 pdf download.Fire-fighting hoses Test methods.
E.1 Test pieces
Cut five test pieces of hose, each 0,35 m in length.
E.2 Apparatus
E2.1 Test machine (see Figure El) for abrading the surface of a pressunzed rotatable test piece with a laterally moveable abrading strip which is continually renewed.
The driven rotating coupling is fixed in the axial direction whereas the other coupling cen be moved axially in a guioe.
The abrasion am, is in the form of a rocker pivoted to swivel upwards, and the weight of the arm is such that a force of 105 N acts on the test piece when it is set horizontally. Thés abrasion arm reciprocates along the hose axis at a rate of between 18 mm!s to 20 mmls over a distance of 80 mm with the direction of travel being changed automatically. The pause time at the reversal points shall not exceed 0,1 s in each case.
The abrasion arm carries the abrading strip which moves 4 mm along the hose length for each double stroke. and the test piece is supported midway along Its length by plain rollers.
E.2.2 Air pressure vessel with a capacity of at least 2 I fitted to the test machine to retain the pressure in the event of a loss of water.
E.2.3 Abrasive material consisting of a roll of corundum twill abrasive cloth measunng 50mm wide and approximately 50 m long. The abrasive usGd for this abrasive material shall be synthetic 15. good quality fused aluminium oxide (A1203) with a minimum AI2O content with mass fraction of 70 %. It shall have a grain size of BOP as specified in the Grain Size Standard (43-1984 rev 1993) of the Federation of European Producers of Abrasive Products (F EPA).
F.1 Test pieces
Cut five test pieces of hose, each 1 m in length.
Since the abrasion resistance shall be determined at five equidistant positions wound the bose, each test piece shall be marked at one of the five positions, ready for abrasion testing. using the centre of one face as a reference point.
F.2 Apparatus
F.2.1 Test machine (see Figure F. 1). for abrading the upper surface of the test piece with a reciprocating movement.
The abrading strip is mounted in a carrier and set at an angle of 4W to the horizontal axis of the test piece and at an angle of 20c to the direction of the reciprocating action of the test machine.
The reciprocating movement shall have a frequency of 50 to 60 double strokes per minute and the length of a single stroke shall be 230 mm.
The machine shall exert a downward force of 15,5 N on the test piece.
NOTE The apparatus should be contared in a box with a shatter resistant transparent cover and it is reconvnended that it should be made from a rust resistant material.
F.2.2 Air nozzle, fitted to the test machine and producing a continuous jet of air to remove debris from the plane of abrasion.
F.2.3 Abrasive material, consisting of an abrasive cloth strip measuring 25 mm x 300 mm.
The abrasive used for this abrasive cloth shall be good quality fused aluminium oxide (A1203) free from extraneous materials and with a minimum Al20, content with a mass fraction of 93 %. It shall have a grain size of 50P as specified in the Grain Size Standard (43.1984 rev 1993) of the Federation of European Producers of Abrasive Products (F EPA). The cloth shall be ol good quabty cotton having a mmrum warp way breaking strength of 1.392 N and a minimum waft way brealdng strength of 431 N.
The abrasive strip shall be renewed for each test.
F.3 Procedure
Position the test piece in a holder to prevent twisting and then connect it to the pressure source and fill with water, expelling all the air. When a pressure of 0,7 PAPa has been achieved, check that the hose and abrading arm are horizontal. Start the machine and abrade the test piece untd it bursts. Record the number of double strokes at burst.