Significance and Use
2.2 Figure 2 provides symbols for valves. Valves are categorized under the following headings: globe, angle, check, ball, butterfly, gate, relief, manifolds, control, noise control, and miscellaneous.
2.3 Figure 3 provides symbols for valve appendages such as actuators and locking devices. Symbols shown on Fig. 3 are to be combined with the appropriate symbol from Fig. 2.
2.4 Figure 4 provides symbols for piping system–related instrumentation. These symbols are categorized under the following headings: pressure, temperature, flow, level, switches, alarms, and miscellaneous.
2.8 Figure 8 provides symbols for noise control components and designations. These symbols are generally used for submarine design.
2.9 Figure 9 provides symbols for transitions. These symbols identify transitions such as pipe material or pipe schedule changes.
Scope
1.2 This set of standard symbols is intended for use on piping system diagrammatics and arrangements for ships.
1.3 Where graphical symbols are required for an item or equipment not covered by this practice, the form and character of the symbol will be left to the discretion of the activity concerned, provided that the symbol used does not duplicate any of those contained herein, and is clearly understandable, subject to one interpretation only, or explained by a suitable note on the drawing when necessary.
