Table 5-2.—Tubing Size Designationcontamination. Therefore in maintenance andPREPARATION OF PIPESrepair of fluid power system lines, the basic designAND TUBINGrequirements must be kept in mind. Two primaryrequirements are as follows:1. The lines must have the correct ID toprovide the required volume and velocity of flowwith the least amount of turbulence during alldemands on the system.2. The lines must be made of the propermaterial and have the wall thickness to providesufficient strength to both contain the fluid at therequired pressure and withstand the surges ofpressure that may develop in the system.Fluid power systems are designed as compactlyas possible, to keep the connecting lines short.Every section of line should be anchored securelyin one or more places so that neither the weightof the line nor the effects of vibration are carriedon the joints. The aim is to minimize stressthroughout the system.Lines should normally be kept as short andfree of bends as possible. However, tubing shouldnot be assembled in a straight line, because a bendtends to eliminate strain by absorbing vibrationand also compensates for thermal expansion and5-3
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