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MAN B&W Appendix A
Symbols for Piping
No. Symbol Symbol designation
1 General conventional symbols
. Pipe
.2 Pipe with indication of direction of flow
.3 Valves, gate valves, cocks and flaps
.4 Appliances
.5 Indicating and measuring instruments
2 Pipes and pipe joints
2. Crossing pipes, not connected
2.2 Crossing pipes, connected
2.3 Tee pipe
2.4 Flexible pipe
2.5 Expansion pipe (corrugated) general
2.6 Joint, screwed
2.7 Joint, flanged
2.8 Joint, sleeve
2.9 Joint, quick�releasing
2. 0 Expansion joint with gland
2. Expansion pipe
2. 2 Cap nut
2. 3 Blank flange
No. Symbol Symbol designation
2. 4 Spectacle flange
2. 5 Bulkhead fitting water tight, flange
2. 6 Bulkhead crossing, non�watertight
2. 7 Pipe going upwards
2. 8 Pipe going downwards
2. 9 Orifice
3 Valves, gate valves, cocks and flaps
3. Valve, straight through
3.2 Valves, angle
3.3 Valves, three way
3.4 Non�return valve (flap), straight
3.5 Non�return valve (flap), angle
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MAN B&W MC/MC�C, ME/ME-B/ME�C/ME�GI engines 198 38 66�2.3
MAN Diesel
3.6
3.7
Non�return valve (flap), straight, screw
down
Non�return valve (flap), angle, screw
down
3.8 Flap, straight through
3.9 Flap, angle
3. 0 Reduction valve
3. Safety valve
3. 2 Angle safety valve
3. 3 Self�closing valve