Plumbing/Piping Drawings, ContinuedShipboardpiping printsStandard piping symbols appear on shipboard piping prints with a symbollist. Sometimes symbol lists are left off the print; therefore, you must befamiliar with standard symbols. Many operation and maintenance manualsdo not use standard symbols because these systems are drawn in detail orpictorially.HydraulicprintsHydraulic systems are on aircraft and on board ships activating weaponssystems, navigational equipment, and remote controls of numerousmechanical devices. Shore stations use hydraulically driven maintenance andrepair shop equipment. Hydraulic systems are also used in construction,automotive, and weight-handling equipment. In general hydraulic lines aredesignated as supply lines, which carry fluids from a reservoir to pumps,pressure lines that carry only pressure, operating lines that alternately carrypressure to and return fluids from an actuating unit, return lines return fluidsto the reservoir, and vent lines that carry excess fluids overboard or intoanother receptacle. To distinguish one hydraulic line from another, the DMdesignates each line according to its function within the system. MIL-STD-17B, part II, lists symbols used on hydraulic systems. On drawings ofhydraulic systems, basic symbols often show a cut-away section to clarifyoperation.Figure 4-55 shows basic types of hydraulic symbols.Figure 4-55.—Basic types ofhydraulic symbols.4-67
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