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P&ID

Piping and Instrument Diagram

Further Reading

 

PAPA

Prepare to Abandon Platform Alarm

Further Reading

 

PCD - Pitch Circle Diameter

The diameter of an imaginary circle drawn through the bolt hole centres on a flange; flywheel; coupling etc

Further Reading

 

PCG - Professional Contractors Group

A UK based body which seeks to represent contractors. Primarily IT based.

Further Reading

 

PDMS

Plant Design and Management System
Software package used for plant design and creation of 3 dimensional models
Further Reading

 

PED

European Union Pressure Equipment Directive (97/23/EC)

Further Reading

 

PES - Programmable Electronic System

A system for control; protection or monitoring based on one or more progamable electronic devices.
The system comprises all elements e.g. power supplies; sensors; actuators; communication paths etc.
Further Reading

 

PFD

Process Flow Diagram

Further Reading

 

PFD

Probability of Failure on Demand

Further Reading

 

PFEER

Prevention of Fire Explosion and Emergency Response.
UK legislation relating to offshore installations which covers the area excluded by DSEAR.
Further Reading

 

PID - Proportional Integral Derivative

The 3 types of control action making up a 3 term controller. Commonly used for valve control.

Further Reading

 

PIG

A device used for cleaning a pipeline or separating two liquids being moved down the pipeline.
Intelligent pigs are fitted with sensors allowing measurement of corrosion and identification of pipeline defects.
Further Reading

 

Pilot

UK Government's Oils and Gas Industry Task Force set up in 1998 to ensure that the UK's oil and gas industry remains competitive.

Further Reading

 

PLB - Personel Locator Beacon

Device issued to each traveler when traveling offshore on a helicopter.
It automatically emits a signal when submersed in the sea thereby giving potential for speedier rescue in event of helicopter ditching.
Further Reading

 

PLC - Programmable Logic Controller

Computer based monitoring and control package where control actions are primarily based on equipment and alarm status.

Further Reading

 

PMC

Project Management Consultancy
Used in relation to a contract e.g. a PMC contract.
Further Reading

 

PMS

Power Management System

Further Reading

 

POB - Persons on Board

Used in reference to the number of people allowed on offshore installations

Further Reading
Guide to Vantage Cards
 

Port

A communications connection on an electronic or computer based device

Further Reading

 

PPE - Personal Protective Equipment

Collective term used for coveralls; gloves; hard hat; protective foot wear; accessories etc designed to create a barrier against workplace hazards.

Further Reading

 

ppm

Parts Per Million

Further Reading

 

Profibus

Vendor-independent open fieldbus standard increasingly used in process control.
Standardised in IEC 61158 and EN50170
Further Reading

 

PSC

Production Sharing Contract

Further Reading

 

PSD

Process Shutdown System

Further Reading

 

psi - Pounds per square inch

A unit of pressure measurement.
If psia then the unit of pressure used when the zero reference is full vacuum and if psig the zero reference is atmospheric pressure.
Further Reading

 

PSU

Power Supply Unit

Further Reading

 

PSV - Pressure Safety Valve

A spring loaded pressure relief valve actuated by the static pressure upstream of the valve and characterised by rapid opening.

Further Reading

 

PTB (DE)

Physikalish Technische Bundesanstalt - Notified Body based in Germany

Further Reading

 

PTW - Permit to Work

A permit-to-work system is a formal written system used to control certain types of work that are potentially hazardous.
It allows work to start only after safe procedures have been defined and they provide a clear record that all foreseeable hazards have been considered.
Further Reading

 

PVC - Polyvinyl Chloride

A thermoplastic often used for piping systems.
PVC is stronger and more rigid than the other thermoplastic materials.
Further Reading

 

 
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