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Drilling Mud

Mixture of water and special additives circulating within the well for the purpose of cooling the drill-bit; removing rock cuttings and transporting them back up to the surface.
Also prevents the well wall from caving in and maintains sufficient pressure at the well bottom to avoid hydrocarbon blowout.
Further Reading



A pipe spool in which a number of incoming pipes are combined to feed to a common output line.

Further Reading



Maximum Allowable Working Pressure
The maximum pressure allowed in a piece of equipment e.g. vessel or pipe at its designated temperature.
Further Reading



Motor Control Centre / Switchboard

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Molecules containing sulphur with a low molecular weight and therefore very light.

Further Reading



An electronic load indicator and monitoring system fitted to cranes - can store data for future analysis and maintenance planning based on the actual crane usage.
Manufactured by Norwegian firm Datainstrument AS
Further Reading


MMI - Man Machine Interface

A dated term superseded by SCADA

Further Reading


MOB - Man Over Board

Some offshore platforms issue personnel with MOB detectors when performing over the side work.
These detectors automatically emit a signal when imersed in the sea thereby allowing possible faster rescue.
Further Reading



Management of Change

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This Protocol is a messaging structure developed by Modicon in 1979.
It is used to establish master-slave/client-server communication between intelligent devices.
Further Reading


MOL - Main Oil Line

Name often given to the oil export line from a platform.
Often used as a prefix to the main export pumps e.g. MOL Pumps
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A nickel-copper alloy which combines high strength with high ductility - these usually being a trade off in metals selection.
Also offers excellent general corrosion resistance. Commonly used in seawater applications.
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Memorandum of Understanding

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Motor Operated Valve

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Magnetic Particle Examination. A form of NDE used to detect surface cracks on castings.

Further Reading


MTBF - Mean Time Between Failures

The time interval between 2 failures of a component. The reciprocal of the failure rate.

Further Reading


MTO - Material Take Off

A count of all materials needed to complete a task

Further Reading


MTTR - Mean Time To Repair

The average time taken from the failure of a system until it is successfully restarted.

Further Reading


Mux - Multiplexer

A switching device that sequentially connects multiple inputs or outputs in order to process several signal channels with a single A/D or D/A converter

Further Reading


MWD - Measurements While Drilling

The evaluation of physical properties (usually including pressure; temperature and wellbore trajectory in three-dimensional space) while extending a wellbore

Further Reading


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