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D&ID

Duct and Instrument Diagram - the HVAC equivalent of a P&ID
An air distribution diagram which typically includes HVAC equipment; instrumentation; connections to other systems; duct sizes etc
Further Reading

 

DAF - Delivered at Frontier

Incoterm used to describe responsibilities for carriage; risk and cost.

Further Reading
INCO Terms Toolbox Page
 

DCS - Distributed Control System

A control system with multiple processors connected by a network.

Further Reading

 

DDP - Delivered Duty Paid

Incoterm used to describe responsibilities for carriage; risk and cost.

Further Reading
INCO Terms Toolbox Page
 

DDU - Delivered Duty Unpaid

Incoterm used to describe responsibilities for carriage; risk and cost.

Further Reading
INCO Terms Toolbox Page
 

DEMKO

Testing institute and Notified Body based in Denmark.

Further Reading

 

DEQ - Delivered Ex Quay

Incoterm used to describe responsibilities for carriage; risk and cost.

Further Reading
INCO Terms Toolbox Page
 

Derrick

Metal tower erected vertically above a well for the purpose of lifting and lowering tubes and tools into the well.

Further Reading

 

DES - Delivered Ex Ship

Incoterm used to describe responsibilities for carriage; risk and cost.

Further Reading
INCO Terms Toolbox Page
 

DIN - Deutsche Industrie Normen

German industrial standards

Further Reading

 

Doghouse

Small house located on the floor of a drill rig used as an office by the driller

Further Reading

 

Downstream

Generic term that includes oil refining; petrochemicals; synthetic gas and fertilizer production facilities.
Downshore activities are oshore based.
Further Reading

 

DSEAR

Dangerous Substances and Explosive Atmosphere Regulations - UK implementation of ATEX 137

Further Reading

 

DSV - Diving Support Vessel

A dedicated vessel for assistance of subsea diving and installation work.

Further Reading

 

DTI

The UK's Department of Trade and Industry

Further Reading

 

Duplex

Name given to a family of stainless steels which have a near equal mix of austenite and ferrite.
Duplex stainless steels exhibit high strength and excellent corrosion resistance.
Further Reading
Stainless Steel Toolbox Page
 

DOL

Direct On Line - A type of motor starter for induction motors.
This is the simplest form of starter comprising a switch (typically an electromagnetic contactor) and an overload protection relay.
Further Reading

 

 
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