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Control and Instrumentation Glossary

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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

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


Man Machine Interface
A dated term superseded by SCADA
Further Reading


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


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.
Further Reading


Magnetic Particle Inspection. 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


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


Multi Flange Connector
A one piece flange unit which permits transition from pipe line flange to instrument tubing.

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


Molecular Weight

Further Reading


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C&I Glossary
Relief Valve Glossary
Engineering Glossary
Nuclear Glossary

C&I Resources

Cable Gland Selector
CE Marking
Flange Dimensions
Ingress Protection
Pipe Schedules
Relief Valve Orifice Size
Temperature Class
Temperature Conversion
Thermocouple Types
Valve Leakage
Vortex Meters
Wires and Cables


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