www .flextral.com A3 A3 T echnical Data Hose Couplings Adapters Accessories Index Quick Couplings Equipment Selection of Hose System type The selection and installation of hoses must be in r ela - tion to pump pr essur e, operating cycle, inner diameters of pipes, and type of fluid. Operating pr essur e Hose lines ar e rated for continuous operation at the maximum operating pr essur es specified for the hose. Generally , the operating pr essur e is one fourth the hose minimum burst pr essur e, thus meeting the SAE r ecom - mended safety factor of 4 to 1. Pr essur e surges Almost all hydraulic systems develop pr essur e surges which may exceed r elief valve settings and af fect the service life of hose and system components. In systems wher e surges ar e sever e, select a hose that will incr ease the safety factor . Conversely , in systems wher e surges ar e slight or non - existent, a smaller safety factor may be used. Operating temperatur es Operating temperatur es specified r efer to maximum temperatur e of the fluid or gases being conveyed (with peaks up to 300?F or 149?C). Continuous operation at or near maximum rated temperatur es will materially r educe the service life of the hose. Ambient temperatur es V ery high or low ambient (outside of hose) temperatur es will af fect cover and r einfor cement materials, thus influ - encing the life of the hose. Bend radius Recommended minimum bend radii ar e based on maxi - mum operating pr essur es with no flexing of the hose. V ibration and flexing Hose lines ar e designed to withstand maximum vibra - tion and flexing. V olumetric expansion Hose is normally manufactur ed with a neutral braid angle to r educe volumetric expansion. Gaseous fluid systems High pr essur e gaseous systems ar e very hazar dous. Hose lines should be adequately pr otected fr om exter - nal shock and mechanical or chemical damage. They should also be suitably pr otected to pr event whip - lash action in the event of failur e for any r easons. It is r ecommended to incr ease safety factor . Hose Installation Guide Be sur e to leave some slack to allow for changes in length under surge pr essur es (estimated at +2% to -4%) Use angle adaptors to avoid sharp twists or bends Allow for movement on flexing or vibrating installations to minimise flex failur e and abrasion Use 45 ? and 90 ? adaptors and fittings to impr ove r outing Hose and Fitting Compatibility SAE J517 hose from one manufactur er is usually not compatible with SAE J516 fittings supplied by another manufactur er . It is the r esponsibility of the fabricator to consult the manufactur er’ s written assembly instructions or the manufactur er dir ectly befor e inter mix - ing hose and fittings from two manufactur ers. Similarly , assembly equipment from one manufactur er is usually not interchangeable with that of another manufactur er . It is the r esponsibility of the fabricator to consult the manufactur er’ s written instructions or the manufac - tur er dir ectly for proper assembly equipment. Always follow the manufactur er’ s instructions for proper pr eparation and fabrication of hose assemblies.