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Selection, Installation & Maintenance inspecting hose and fittings, inspect for related items includ- ing: A. Leaking ports. Incorrect Correct B. Damaged or missing hose clamps, guards or shields. C. Excessive dirt and debris around hose. D. System fluid: Level, type, contamination, condition and air entrainment. If any of these are found, address them appropriately. 8.4 Functional Test � Functional tests determine if systems FIGURE 8 -- TWIST ANGLE AND ORIENTATION are leak free and operating properly. Carry out functional tests per information from equipment manufacturers. 7.4 Securement and Protection � Install necessary restraints and protective devices. Determine that such 9. Hose Storage � Age control and the manner of storage can af- devices do not create additional stress or wear points. fect hose life. Use the following practices when storing hose. 7.5 Routing � Review proper routing practices provided in Sec- 9.1 Age Control � Maintain a system of age control to deter- tion 5 and make appropriate corrections to obtain mine that hose is used before its shelf life has expired. Shelf optimum performance. life is the period of time when it is reasonable to expect the hose to retain full capabilities for rendering the intended 7.6 Assembly Torque � The connection end of a hose is service. normally threaded to obtain a tight pressure seal when Store hose in a manner that facilitates age control and first-in, attached to a port, an adapter, or another fitting. Sometimes first-out usage based on manufacturing date on hose or hose bolts or screws provide the threaded connection. Each size assembly. Per SAE J517: and type of connection requires different torque values, and these may vary due to type of material or exterior coating. A. Shelf life of rubber hose in bulk form, or in hose as- semblies passing visual inspection and proof test, is 7.7 System Checkouts � In hydraulic or other liquid systems, forty quarters (ten years) from the date of vulcaniza- eliminate all air entrapment after completing the installation. tion. Follow manufacturers' instructions to test the system for B. Shelf life of thermoplastic and polytetrafluoroethylene possible malfunctions and leaks. hose is considered to be unlimited. 7.7.1 To avoid injury during system checkouts: 9.2 Storage � Store hose and hose assemblies in a cool, dark, dry area with the ends capped. When storing hose, take A. Do not touch any part of the system when checking for care to avoid damage that could reduce hose life, and follow leaks (see 4.1). the manufacturers' information for storage and shelf life. Examples of factors that can adversely affect hose product in B. Stay out of potentially hazardous areas while testing hose storage are: systems (see Section 4). A. Temperature C. Relieve system pressure before tightening B. Ozone connections. C. Oils D. Corrosive liquids and fumes 8. Maintenance Inspection � A hose and fitting maintenance E. Rodents program may reduce equipment downtime, maintain peak F. Humidity operating performance, and reduce the risk of personal injury G. Ultraviolet light and/or property damage. The user should design and H. Solvents implement a maintenance program that suits the specific I. Insects application and each specific hose in that application. J. Radioactive materials 8.1 Inspection Frequency � Evaluate factors such as the If there are any questions regarding the quality or usability of nature and severity of the application, past history, and manu- hose or hose assemblies, evaluate appropriately: facturers' information to establish the frequency of visual CoiledAirHose,HydraulicPTFE&Technical& inspections and functional tests. A. Flex the hose to the minimum bend radius and com- (Fleet)Truck&ToolingFittingsThermoplastic&HosePneumaticAlphanumeric&ApprovalsDesignHose pare it with new hose. After flexing, examine the cover ProductsEquipmentAccessories&TubingFittingsFit.&HoseIndexGuidesInformationAccessories 8.2 Visual Inspection (Hose and Fittings) � Visually inspect and tube for cracks. If any appear, no matter how hose and fittings for: small, reject the hose. B. If the hose is wire reinforced, and the hose is unusually A. Leaks at hose fitting or in hose. stiff, or a cracking sound is heard during flexing, check B. Damaged, cut or abraded cover. for rust by cutting away a section of the cover from a C. Exposed reinforcement. sample. Rust would be another reason for rejection. D. Kinked, crushed, flattened, or twisted hose. C. If doubt still persists, contact hose assembler to E. Hard, stiff, heat cracked, or charred hose. conduct proof-pressure tests or any other tests needed F. Blistered, soft, degraded, or loose cover. to verify hose quality. G. Cracked, damaged, or badly corroded fittings. H. Fitting slippage on hose. Prepared by the SAE Fluid Conductors and Connectors Technical I. Other signs of significant deterioration. If any of these Committee SC3�Training and Education Subcommittee conditions exist, evaluate the hose assemblies for cor- rection or replacement. 8.3 Visual Inspection (All Other Components) � When visually 271 Parker Hannifin Corporation Parflex Division Ravenna, Ohio
Goodyear Rubber Products
