A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Dangerous Substance 
Datum Level
DCS
Dead Band (IEC 60050-311)
Deadband
Deck
Declaration of Conformity (Annex VII)
Defect
Degradation Mechanism
Delamination
Denial of Service (DOS)
Dependent Failure
Depression
Depth of Tread
Design Authority
Design Differential Pressure
Design Fault
Design Life
Designer
Designer (Engineer)
Deviation (BS EN 60359) / Difference / Error
Diagnostic
Differential Settlement
Dipping Device
Direct Measurement (BS EN 60359)
Directional Sound-Pressure
Directivity Index
Disable
Display
Diversity
Diver-less Systems
Dome Roof
Dominant Failure Mode
Double Block and Bleed Valve
Double Containment
Double Deck Floating Roof
Double Isolation Block Valve
Double Piston Seat Ball Valve
Double-Sided Weld
Down Conductors
Down Time
Downstream Sealing Valve
Drain
Drawings
Drift (BS EN 61207-1, IEC 60050-311)
DSEAR
Duty Holder
Dynamic restraints – Examples: Snubber, Sway Brace, Shock Arrester