Engineering Abbreviations and Definitions

Updated: Feb 8


Abbreviations are used often to minimize length of conversation and writing in the engineering world. They are very useful to those familiar in the industry to become nomenclatures and jargons to be used to speed up comprehension of the matter discussed and save time. However, there has not been standardization of abbreviation which makes it inconsistent amongst different sub-industries, companies and generations. Below are some of the collection of abbreviation which we hope to become useful to you. We are committed to adding content continuously. Feel free to share this page with anyone who needs it.


ANSI American National Standards Institute

API American Petroleum Institute

ARO At (Upon) Received of Order

ASME American Society of Mechanical Engineers

ASTM American Society for Testing and Materials

BDV Blow Down Valve

BFD Block Flow Diagram

BHP Brake Horse Power

BMS Burner Management System

BOM Bill Of Material

BOO Build Own Operate

BOP Balance Of Plant

BOP Blow Out Preventer

BPD Barrels Per Day

BSI British Standard Institute

BTEX Benzene Toluene Ethylbenzene and Xylene

CAPEX Capital Expenditure

CAR Corrective Action Report

CCPP Combined Cycle Power Plant

CCR Coal Combustion Residuals

CFR Cost and Freight

CIF Cost, Insurance and Freight

CIP Carriage and Insurance Paid To

CIU Chemical Injection Points

CNG Compressed Natural Gas

COB Closed of Business (Day)

CPI Corrugated Plate Interceptor

CPT Carriage Paid To

CPT Cone Penetration Test

DAF Dissolved Air Floatation

DAP Delivered At Place

DCS Distributed Control System

DCS Drilling Control System

DDP Delivered Duty Paid

DGF Dissolved Gas Floatation

DIN Deutsches Institut für Normung; meaning "German institute for standardization"

DPI Differential Pressure Indicator

DPU Delivered At Place Unload

DPT Differential Pressure Transmitter

EBITDA Earnings Before Interest Tax Depreciation And Amortization

EOR Enhanced Oil Recovery

EPA Environmental Protection Agency

EPC Engineering Procurement Construction

EPCC Engineering Procurement Construction Commissioning

EPCI Engineering Procurement Construction Installation

EPCM Engineering Procurement Construction Management

EPF Early Production Facility

ESD Emergency Shutdown Valve

ESDV Emergency Shutdown Valve

EXW Ex Works

FAS Delivered Alongside Ship

FB Full Bore

FCA Free Carrier

FE Flow Element

FGD Flue Gas Desulfurization

FOB Freight On Board

FOG Fats Oil and Grease

FP Full Port

FPSO Floating Production Storage and Offloading

FSO Floating (Production) Storage and Offloading

F/S Flow Station

GSA Gas Sales Agreement

GOST Gosudarstvennyy Standart; meaning state standard or governmental standard (Russian)

HAZID Hazardous Identification

HAZOP Hazardous And Operability Study

HMB Heat and Material Balance

HPAI High Pressure Air Injection Plant

HPU Hydraulic Power Units

IA Instrument Air

IEC International Electrotechnical Commission

IECEx International Electrotechnical Commission for Explosion Atmospheres

IFC Issued for Construction

IFR Issued for Review

ISBL Inside Boundary Limit

ISO International Standards Organization

I&E Instrumentation and Electrical

KOD Knock Out Drum

LACT Lease Automatic Custody Transfer

LNG Liquified Natural Gas

LOTO Lock Out Tag Out

MCC Motor Control Center

MEG Mono Ethylene Glycol

MMSCFD Million Standard Cubic Feet Per Day

MPI Magnetic Particle Imaging

MRU Mechanical Refrigeration Unit

MSA Master Service Agreement

MTO Material Take Off List

NCA Non-Compete Agreement

NCR Non-Conformance Report

NDA Non-Compete Agreement

NDE Non-Destructive Examination

NDT Non-Destructive Testing

NOX Nitrogen Oxide

NPS Nominal Pipe Size

OHSAS Occupational Health and Safety Assessment Series

OHSMS Occupational Health and Safety Management Systems

OML Oil Mining License

OMS Operating Management System

OPEX Operating/Operation Expenditure

OSBL Outside Battery Limit

OSHA Occupational Safety and Health Administration

O&G Oil And Gas

PFD Process Flow Diagram

PI Pressure Indicator

POL Petroleum Oil And Lubricant

POWT Publicly Owned Water Treatment

PT Pressure Transmitter

P&ID Piping and Instrumentation Diagram

QA/QC Quality Assurance/Quality Check

QMS Quality Management System

RAS Return Activated Sludge

RB Reduced Bore

RBC Rotating Biological Contactors

RF Raised Face

RFI Request For Information

RFP Request For Proposal

RFQ Request For Quote

RP Reduced Port

RRF Risk Reduction Factor

RTS Ready to Ship

RV Relieve Valve

SCFM Standard Cubic Feet Per Minute

SCM Subsea Control Module

SCMMB SCM Mounting Base

SCS Subsea Control System

SDU Subsea Distribution Assemblies

SDV Shutdown Valve

SIL Safety Integrity Level

SIS Safety Instrumented System

SIS Safety Integrity System

SME Subject Matter Expert

SSO Sanitary Sewer Overflow

SURPE Surface Production Equipment

TEG Triethylene Glycol

TI Temperature Indicator

TOG Total Oil and Grease

TPH Tones Per Hour

TPH Total Petroleum Hydrocarbon

TT Temperature Transmitter

TUTA Topside Umbilical Termination Assemblies

UL Underwriter Laboratories

UTH Umbililcal Termination Heads

VAC Volts of Alternating Current

VDC Volts of Direct Current

VOC Volatile Organic Carbon

VRU Vapor Recovery Unit

WAS Waste Activated Sludge

WHRB Waste Heat Recovery Boiler

WMD Walnut (Shell) Media Filter

WSF Walnut Shell Filter

ZLD Zero Liquid Discharge

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