Plumbing/Piping Drawings, Continued
Shipboard
piping prints
Standard piping symbols appear on shipboard piping prints with a symbol
list. Sometimes symbol lists are left off the print; therefore, you must be
familiar with standard symbols. Many operation and maintenance manuals
do not use standard symbols because these systems are drawn in detail or
pictorially.
Hydraulic
prints
Hydraulic systems are on aircraft and on board ships activating weapons
systems, navigational equipment, and remote controls of numerous
mechanical devices. Shore stations use hydraulically driven maintenance and
repair shop equipment. Hydraulic systems are also used in construction,
automotive, and weight-handling equipment. In general hydraulic lines are
designated as supply lines, which carry fluids from a reservoir to pumps,
pressure lines that carry only pressure, operating lines that alternately carry
pressure to and return fluids from an actuating unit, return lines return fluids
to the reservoir, and vent lines that carry excess fluids overboard or into
another receptacle. To distinguish one hydraulic line from another, the DM
designates each line according to its function within the system. MIL-STD-
17B, part II, lists symbols used on hydraulic systems. On drawings of
hydraulic systems, basic symbols often show a cut-away section to clarify
operation.
Figure 4-55 shows basic types of hydraulic symbols.
Figure 4-55.—Basic types of
hydraulic symbols.
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