Copyright Goodheart-Willcox Co., Inc. 198 Fluid Power materials do provide information that can be readily used to select items for a system. Common information includes: • Construction details and typical applications. • Dimensions. • Acceptable operating temperatures and pressures. • Flow rates for different conductor sizes and pressure drops. Typically, the information provided for pipe and tubing relates to the material the item is made from and the fi nished dimensions. The information also specifi es the rating of the product in relation to an SAE specifi cation or one from another standardizing group. Many companies produce hose with a wide vari- ety of features not included in the specifi cation of a rat- ing organization. As such, the information provided on data sheets for hydraulic hose usually includes addi- tional information not found on pipe and tubing data sheets. Hydraulic hose catalogs and data sheets often include construction details, typical applications, and acceptable operating temperature ranges. They also include materials and information related to specifi ca- tion numbers of standardizing organizations. Detailed information concerning the fi ttings required to connect conductors and specifi c system components are also available in company catalogs. Care must be taken to carefully examine cata- log data. The exact type of information supplied will vary from one manufacturer to another manufacturer. Hydraulic service personnel need to be reasonably profi cient in interpreting catalog information. This profi ciency will increase as you work with a variety of catalogs on the job. 8.5 Conductor Installation When selecting conductors for hydraulic-powered equipment, installation factors must be considered in addition to pressure and fl ow requirements and tem- perature conditions. When examining the equipment, consider required component movement, conductor fl exibility, and potential operating conditions involv- ing vibration and abrasion. These factors infl uence the types of conductors selected and the methods used to install them in the equipment. 8.5.1 Pipe When installing pipe as the conductor in a hydraulic system, the primary considerations are: • Matching the centerline of the pipe to the centerline of the component connections. • Determining the proper length of conductor. Hose specifi cations should be carefully examined to ensure the hose selected for the system can tolerate the temperatures that will be encountered during system operation. 8.4 Interpreting Data Sheets from Manufacturers A sizable number of companies produce products related to hydraulic fl uid conductors. The Fluid Power Handbook and Directory lists product categories for pipe, tubing, and hose. For example, the Hydraulic Hose category identifi ed in the directory lists the com- panies that produce hose. In addition to the product categories, the directory includes a considerable num- ber of other categories related to conductors, such as fi ttings and seals. The companies publish a wide vari- ety of catalog materials and technical data sheets that describe their products in detail. The published materials usually provide a con- siderable amount of information about the products of a company. It can be diffi cult to obtain compara- tive information on similar products because no stan- dard format is required by the industry. However, the Used with permission of CNH America LLC Figure 8-26. Temperature-sensing devices range from simple thermometers to elaborate temperature recording devices. System operating temperatures must be carefully considered when selecting hose.