www .flextral.com A2 A2 T echnical Data Hose Couplings Adapters Accessories Index Quick Couplings Equipment Recommended Practices for Hydraulic Hose Assemblies - SAE J1273 1996 For ewor d The SAE Recommended Practices is intended as a guide to consider when selecting, r outing, fabricating, install - ing, r eplacing, maintaining, and storing hose for fuid- power systems. It is subject to change to keep pace with experience and technical advances. For those new to hose use in fuid power systems, this guide outlines practices to note during each phase of system design and use. Experienced designers and users skilled in achieving pr oper r esults, as well as the less experienced, can use this outline as a list of considerations to keep in mind. Fluid-power systems ar e complex and r equir e extensive knowledge of both the system r equir ements and the vari - ous types of hose. Ther efor e, all inclusive, detailed, step by step instructions ar e not practical and ar e beyond the scope of this document. Less experienced designers and users who need mor e information can consult spe - cialists such as hose suppliers and manufactur ers. This guide can impr ove the communication pr ocess. Safety Considerations These r ecommended practices involve safety consider - ations; note these car efully during all phases of design and use of hose systems. Impr oper selection, fabri - cation, installation, or maintenance of hose and hose assemblies for fuid power systems may r esult in serious personal injury or pr operty damage. These r ecommend - ed practices can r educe the likelihood of component or system failur e, ther eby r educing the risk of injury or damage. 1 . Scope - SAEJ1273 pr ovides guidelines for selection, r outing, fabrication, installation, r eplacement, maintenance, and storage of hose and hose assemblies for fluid-power systems. Many of these SAI Recommended Practices also may be suitable for other hoses and systems. 2. Refer ence 2,1 Applicable publications - The following publications form a part of this specification to the extent specified her ein, Unless otherwise specified, the latest issue of SAF publications shall apply . 2.1.1 SAE publications - A vailable for SAE, 400 Commonwealth Drive, W arr endale, P A 15096-000 SAEJ343 -T est and Pr ocedur es for SAE 100 R Series Hydraulic Hose and Hose Assemblies SAEJ514 - Hydraulic T ube Fittings SAEJ517 - Hydraulic Hose SAEJ 1927 - Cumulative Damage Analysis for Hydraulic Hose Assemblies 2.1.2 ISO publications - A vailable fr om ANSI, 11 W est 42nd Str eet, New Y ork, NY 10036-8002 ISO 3457 - Earth moving machinery - Guar ds and shields defi - nitions and specifications. 3. Definitions These explanations serve only to clarify this document and ar e not intended to stand alone. They ar e pr esented sequentially , with the former helping to explain the latter . 3.1 Fluid-power Energy transmitted and contr olled using pr essurized hydraulic fluids or compr essed air . 3.2 Hose - flexible conductor . In this document, the term hose also may r efer to a hose assembly with r elated accessories used in fluid power applications. 3.3 Hose fitting or fitting - connector which can be attached to the end of a hose. 3.4 Hose assembly - hose with hose fittings attached. 3.5 Hose failur e - occurr ence in which a hose stops meeting system r equir ements. 3.6 Hose service life - length of time a hose meets system r equir ements without needing r eplacement. 4. Safety considerations - listed in 4.1 to 4.7 ar e some poten - tial conditions and situations that may lead to personal injury and/or pr operty damage. This list is not necessarily all inclu - sive. Consider r easonable and feasible means, including those described in this section, to r educe the risk of injuries or pr op - erty damage. T raining, including the information in this document, for opera - tors, maintenance personnel, and other individuals working with hoses under pr essur e is encouraged. 4.1 Fluid injections - fine str eams of escaping pr essurised fluid can penetrate skin and enter a human body . These fluid injections may cause sever e tissue damage and loss of limb. Consider various means to r educe the risk of fluid injections, particularly in ar eas normally occupied by operators. Consider car eful r outing, adjacent components, war nings, guar ds, shields, and training pr ograms. Relieve pr essur e befor e disconnecting hydraulic or other lines. Tighten all connections befor e applying pr essur e. A void contact with escaping fluids. T r eat all leaks as though pr essurised and hot enough to bur n skin. Never use any part of your body to check a hose for leaks. If a fluid-injection accident occurs, see a doctor immediately . DO NOT DELA Y OR TREA T AS A SIMPLE CUT! Any fluid injected into skin must be surgically r emoved within a few hours or gangr ene may r esult. Doctors unfamiliar with this type of injury should consult a knowledgeable medical sour ce. 4~2 Whipping hose - if a pr essurised hose assembly blows apart, the fittings can be thr own of f at high speed, and the loose hose can flail or whip with gr eat for ce. This is particularly true in compr essible-fluid systems. When the risk exists, con - sider guar ds and r estraints to pr otect against injury . 4~3 Bur ns fr om conveyed fluids - fluid-power media may r each temperatur es that can bur n human skin. If ther e is risk of bur ns fr om escaping fluid, consider guar ds and shields to pr event injury , particularly in ar eas normally occupied by operators. 4~4 Fir e and explosions fr om conveyed fluids - most fluid- power media, including fir e-r esistant hydraulic fluids, will bur n under certain conditions. Fluids which escape fr om pr es - surised systems may form a mist or fine spray which can flash or explode upon contact with an ignition sour ce. Consider selecting, guar ding, and r outing hose to minimize the risk of combustion (see Section 5 and ISO 3457). 4.5 Fir e and explosions fr om static-electric discharge - fluid passing thr ough hose can generate static electricity , r esulting in static electric discharge. This may cr eate sparks that can ignite system fluids or gases in the surr ounding atmospher e. When this potential exists, select hose specifically designed to carry the static-electric charge to gr ound.