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C of G

Centre of Gravity

Further Reading

 

Calibration

The process of adjusting an instrument so that its reading can be correlated to the actual values being measured.

Further Reading

 

Capex

Capital Expenditure

Further Reading

 

CAT

Carbon Abatement Technology
Includes improving the efficiency of and co-firing of power plant with low carbon alternatives such as biomass. Also CCS.
Further Reading

 

Cat Cracker

A refinery unit used to break up large hydrocarbon molecules into smaller ones.
The conversion operation takes place at very high temperatures (500 degrees Celcius) in the presence of a catalyst.
Further Reading

 

Cavitation

A condition of liquid flow where a liquid vaporises and the vapour bubbles subsequently collapse.
Can produce surface damage to pumps; valves etc.
Further Reading

 

CCC - Compressor Controls Corporation

US based manufacturer of antisurge devices for centrifugal compressors.

Further Reading

 

CCR

Central Control Room

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CCS

Carbon Capture and Storage. Three methods of capture used are pre combustion; post combustion and oxy-firing.
Storage of captured CO2 usually in depleted oil reservoirs.
Further Reading

 

CEMEP

European Committee of Manufacturers of Electrical Machines and Power Electronics

Further Reading

 

CEN - Committee European de Normalisation

One of the European Standards Bodies that produces harmonised standards in all fields except electrotechnical and telecoms.

Further Reading

 

CENELEC

European Committee for Electrotechnical Standardisation

Further Reading

 

CESI

Testing institute and Notified Body based in Italy.
Also provide power system studies and consultancy to power producers; electrical utilities; large-scale users of electricity and Financial Institutions.
Further Reading

 

Cessation of Production

One of the first significant mile stones in platform decommissioning.

Further Reading

 

CFD

Computational Fluid Dynamics
A mathematical modelling technique.
Further Reading

 

CFR - Cost and Freight

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

Further Reading
INCO Terms Toolbox Page
 

CHP

Combined Heat and Power

Further Reading

 

CIF - Cost Insurance and Freight

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

Further Reading
INCO Terms Toolbox Page
 

CIP - Carriage and Insurance Paid To

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

Further Reading
INCO Terms Toolbox Page
 

CNS

Central North Sea

Further Reading

 

COD - Chemical Oxygen Demand

The quantity of oxygen used in biological and non-biological oxidation of materials in water.
Used as a measure of water quality.
Further Reading
BiologicaL Oxygen Demand
 

Cold Work

The carrying out of any task or the use of any tool or equipment which will not produce a source of ignition.

Further Reading

 

COMAH

Control of Major Accidents and Hazards - Onshore equivalent of the offshore safety case document.

Further Reading

 

Condensate

A term used to describe light liquid hydrocarbons separated from crude oil after production and sold separately.

Further Reading

 

COSHH

UK regulations set up in 1994 for Control of Substances Hazardous to Health.

Further Reading

 

CPD - Continued Professional Development

The planned acquisition of knowledge; experience; skills and the development of personal qualities necessary for the execution of professional duties throughout the working life.

Further Reading

 

CPT - Carriage Paid To

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

Further Reading
INCO Terms Toolbox Page
 

CPU

Central Processing Unit

Further Reading

 

CRA

Corrosion Resistant Alloy

Further Reading

 

CRI

Cuttings Re Injection.
Name given to the process of injecting drilling debris back in to the well.
Further Reading

 

CRO

Control Room Operator

Further Reading

 

Crude Unit

The refinery processing unit where initial crude oil distillation takes place. The crude unit makes the first rough distillation cut.
The lighter products produced in this process are further refined in the cat cracker or the reforming unit. Heavier products which cannot be vaporised and separated in this process are distilled still further in the vacuum distillation unit or the coker.
Further Reading

 

CSA - Canadian Standards Association

Publishes standards for equipment requirements

Further Reading

 

CSB

Chemical Safety and Hazard Investigation Board
Independent US federal agency responsible for investigating the causes of accidents due to hazardous materials in commerce and industry.
Further Reading

 

CTC - Cost to Company

Used in relation to employment - Includes holidays; training; salary; sickness pay etc.

Further Reading

 

CTR - Cost Time Resource

Common term used for a booking code

Further Reading

 

CUI

Corrosion Under Insulation
A major cause of pipeline leaks.
Further Reading

 

CV - valve flow coefficient

A measurement of valve capacity.
The number of gallons per minute of room temperature water that will flow through the valve with a pressure drop of 1 psi across the valve.
Further Reading

 

CVI

Close Visual Inspection

Further Reading

 

 
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