REAFFIRMATION WITH EDITORIAL REVISION

August 2016

Piping

PIP PNC00002
Abbreviated Piping Terms and Acronyms
 PURPOSE AND USE OF PROCESS INDUSTRY PRACTICES

In an effort to minimize the cost of process industry facilities, this Practice has been
prepared from the technical requirements in the existing standards of major industrial users,
contractors, or standards organizations. By harmonizing these technical requirements into a single
set of Practices, administrative, application, and engineering costs to both the purchaser and the
manufacturer should be reduced. While this Practice is expected to incorporate the majority of
requirements of most users, individual applications may involve requirements that will be
appended to and take precedence over this Practice. Determinations concerning fitness for purpose
and particular matters or application of the Practice to particular project or engineering situations
should not be made solely on information contained in these materials. The use of trade names
from time to time should not be viewed as an expression of preference but rather recognized as
normal usage in the trade. Other brands having the same specifications are equally correct and may
be substituted for those named. All Practices or guidelines are intended to be consistent with
applicable laws and regulations including OSHA requirements. To the extent these Practices or
guidelines should conflict with OSHA or other applicable laws or regulations, such laws or
regulations must be followed. Consult an appropriate professional before applying or acting on any
material contained in or suggested by the Practice.

This Practice is subject to revision at any time.

© Process Industry Practices (PIP), Construction Industry Institute, The University of Texas at
Austin, 3925 West Braker Lane (R4500), Austin, Texas 78759. PIP Member Companies and
Subscribers may copy this Practice for their internal use. Changes or modifications of any kind are not
permitted within any PIP Practice without the express written authorization of PIP. Authorized Users
may attach addenda or overlays to clearly indicate modifications or exceptions to specific sections of
PIP Practices. Authorized Users may provide their clients, suppliers and contractors with copies of the
Practice solely for Authorized Users’ purposes. These purposes include but are not limited to the
procurement process (e.g., as attachments to requests for quotation/ purchase orders or requests for
proposals/contracts) and preparation and issue of design engineering deliverables for use on a specific
project by Authorized User’s client. PIP’s copyright notices must be clearly indicated and
unequivocally incorporated in documents where an Authorized User desires to provide any third party
with copies of the Practice.

PUBLISHING HISTORY
October 1998 Issued October 2010 Reaffirmation with Editorial Revision
September 2004 Complete Revision August 2016 Reaffirmation with Editorial Revision

Not printed with State funds

 REAFFIRMATION WITH EDITORIAL REVISION
August 2016

Piping

PIP PNC00002
Abbreviated Piping Terms and Acronyms
Table of Contents

1. Introduction .................................2
1.1 Purpose ..............................................2
1.2 Scope .................................................2

2. Requirements ..............................2

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PIP PNC00002 REAFFIRMATION WITH EDITORIAL REVISION
Abbreviated Piping Terms and Acronyms August 2016

1. Introduction

1.1 Purpose
This Practice provides a system for engineers to identify abbreviated piping terms and
acronyms used in PIP piping Practices.

1.2 Scope
This Practice establishes the definitions and interpretations for all piping-related
abbreviations and acronyms used in piping Practices.
Abbreviations for technical societies, codes, standards, etc., are not included.

2. Requirements
2.1 The abbreviations listed in this Practice are uniquely piping-related and shall be used in
piping Practices without further definition in those Practices.
2.2 Abbreviations not listed shall be spelled out or defined in a piping Practice in which the
abbreviations are used.
2.3 Other interpretations of the abbreviations defined in this Practice shall not be applicable
to PIP piping Practices.

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PIP PNC00002 REAFFIRMATION WITH EDITORIAL REVISION
Abbreviated Piping Terms and Acronyms August 2016

Abbreviated Piping Terms and Acronyms

Abbreviation Description Abbreviation Description

AARH Arithmetic Average Roughness EB Extended Bonnet
Height (Replaced by RA)
ABS Acrylonitrile-butarene styrene EC Eddy Current Testing (Examination)
ATM Atmosphere ECC Eccentric
AVG Average ECTFE Ethylene-Chlortrifluoroethylene
B&S Bell & Spigot EFW Electric Fusion Welded
BB Bolted Bonnet EL Elevation
BBE Bevel Both Ends ELL Elbow
BC Bolt Circle ELLIP Elliptical
BD Blow Down EOL Elbolet
BE Beveled End EPDM Ethylene-Propylene-Diene
Terpolymer / EP Rubber
BF Blind Flange EQ Equal
BL Battery Limit ERW Electric Resistance Welded
BLD Blind F Fahrenheit
BLE Bevel Large End F-F Face-to-Face
BOE Bevel One End FBE Flange Both Ends
BOM Bill of Material FCAW Flux Cored Arc Welding
BOP Bottom of Pipe FEP Perfluoro (Ethylene-Propylene)
Copolymer
BR Bronze FF Flat Face
BSE Bevel Small End FFW Field Fit Weld
BTM Bottom FIG Figure
BW Butt Weld FIN Finish
C Centigrade; Celsius FLE Flange Large End
C-C Center to Center FLEX Flexible
CA Corrosion Allowance FLG Flange
CAB Cellulous acetate-butyrate FMU Fitting Make Up
CALC Calculated FNPT Female National (Taper) Pipe Threads
CI Cast Iron FOB Flat on Bottom
CL Centerline FOE Flange One End
CM Centimeter FOF Face of Flange
CONC Concentric FOT Flat on Top
CONN Connection FP Full Port
CPLG Coupling FRP Fiberglass Reinforced Plastic
CPVC Chlorinated Polyvinyl Chloride FS Forged Steel
CS Carbon Steel FSE Flange Small End
CU Copper FT Foot; Feet
CWO Chain Wheel Operator FTG Fitting
CWP Cold Working Pressure FV Full Vacuum
DEG Degree FW Field Weld
D/P Differential Pressure G Gram
DI Ductile Iron GA Gauge
DIA Diameter GALV Galvanized
DIM Dimension GBE Groove Both Ends
DN Diameter Nominal (Metric) GE Groove End
DP Design Pressure GJ Ground Joint
DRN Drain GLE Groove Large End
DT Design Temperature GMAW Gas Metal Arc Welding
DWG Drawing GO Gear Operator
EA Each GOE Groove One End

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PIP PNC00002 REAFFIRMATION WITH EDITORIAL REVISION
Abbreviated Piping Terms and Acronyms August 2016

Abbreviated Piping Terms and Acronyms (continued)

Abbreviation Description Abbreviation Description

GR Grade MAX Maximum
GRND Ground(ed) MDMT Minimum Design Metal Temperature
GRP Glass Reinforced Plastic MFG Manufacturer
GSE Groove Small End MI Malleable Iron
GSKT Gasket MIN Minimum
GTAW Gas Tungsten Arc Welding MISC Miscellaneous
H Horizontal MJ Mechanical Joint
HAZ Heat Affected Zone MNPT Male National (Taper) Pipe Threads
HB Hardness Brinell Scale MT Magnetic Particle Testing (Exam)
HD Head MTL Material
HDPE High Density Polyethylene MTO Material Take Off
HB Hardness Brinell Scale MTR Material Test Report
HDR Header N/A Not Applicable
HEX Hexagonal NBR Nitrile-Butadiene/Nitrile or BunaN Rubber
HF Hard Faced NIPP Nipple
HK Hardness Knoop Scale NPS Nominal Pipe Size
HP High Pressure NPT National (Taper) Pipe Thread
HPT High Point NRS Non-Rising Stern
HR15N Hardness Rockwell 15N Scale NTS Not to Scale
HRB Hardness Rockwell B Scale OD Outside Diameter
HRC Hardness Rockwell C Scale OR Outer Ring
HT Heat Treatment ORIF Orifice
HV Hardness Vickers Scale OS&Y Outside Screw & Yoke
HW Handwheel OSBL Outside Battery Limits
IBBM Iron Body Bronze Mounted P&ID Piping and Instrumentation Diagram
ID Inside Diameter P-T Pressure Temperature
IN Inch PARA Paragraph
INS Insulation PAW Plasma Arc Welding
IR Inner Ring PB Polybutylene
IRF Integrally Reinforced Fitting PBE Plain Both Ends
ISBL Inside Battery Limits PE Polyethylene; Plain End
ISO Isometric Drawing PFA Perfluoro (Alkoxyalkane) Copolymer
ISRS Inside Screw Rising Stem PIV Post Indicator Valve
ITCS Impact Tested Carbon Steel PL Plate
JE Joint Efficiency PLE Plain Large End
KCS Killed Carbon Steel PO Pushed On
KG Kilogram POE Plain One End
KPA Kilopascals POS Point of Support
(Pressure = psig x 6.895)
LB Large Bore PP Polypropylene
LDPE Low Density Polyethylene PPB Parts per Billion
LJ Lap Joint PPM Parts per Million
LP Low Pressure PRESS Pressure
LPG Liquefied Petroleum Gas PS Pipe Support
LPT Low Point PSE Plain Small End
LR Long Radius PSI Pounds per Square Inch
LTE Long Tangent Elbow PSIA Pounds per Square Inch Absolute
LWN Long Welding Neck PSIG Pounds per Square Inch Gauge
M Meter PT Liquid Penetrant Testing (Exam)
MxF Male by Female PTFE Polytetrafluoroethylene
MAWP Maximum Allowable Working PVC Polyvinyl Chloride
Pressure

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PIP PNC00002 REAFFIRMATION WITH EDITORIAL REVISION
Abbreviated Piping Terms and Acronyms August 2016

Abbreviated Piping Terms and Acronyms (continued)

Abbreviation Description Abbreviation Description

PVDC Polyvinylidene Chloride T&C Threaded and Coupled
PVDF Polyvinylidene Fluoride T&G Tongue and Groove
PWHT Postweld Heat Treatment T/SW Threaded by Socket Weld
RA Roughness Average T-T Tangent-to-Tangent
(Replaced AARH)
RAD Radius TAN Tangent
RAT Rating TBE Thread Both Ends
RED Reducer; Reducing TCE Tube Compression End
REF Reference TEMP Temperature
REINF Reinforced TFE Tetrafluoroethylene
REPAD Reinforcing Pad THK Thick
REQD Required THD or THRD Thread; Threaded
REV Revision TLE Thread Large End
RF Raised Face TOC Top of Concrete
RJ Ring Joint TOE Thread One End
RP Reduced Port TOG Top of Grout
RPO Restrained Push On TOL Thredolet
RS Rising Stem TOP Top of Pipe
RT Radiographic Testing (Exam) TOS Top of Steel; Top of Support
RTFE Reinforced TFE TSE Thread Small End
RTP Reinforced Thermosetting Plastic TW Thermowell
RTR Reinforced Thermoset Resin TYP Typical
SAW Submerged Arc Welding UB Union Bonnet
SB Small Bore UG Underground
SCH Schedule UNC Unified National Coarse Thread
SDR Standard Dimensional Ratio UNF Unified National Fine Thread
SG Specific Gravity UNS Unified Numbering System
SMAW Shielded Metal Arc Welding UT Ultrasonic Testing (Exam)
SMLS Seamless V Vertical
SO Slip On V/D Vents and Drains
SOCW Socket Weld (see SW) VT Visual Testing (Exam)
SOL Sockolet W/ With
SP-WD Spiral Wound W/O Without
SPA Spacer WB Welded Bonnet
SPEC Specification WE Weld End
SQ Square WN Weld Neck
SR Short Radius WOG Water, Oil, & Gas
SS Stainless Steel WOL Weldolet
ST Seat WP Working Point
STD Standard WPS Weld Procedure Specification
STL Steel WT Wall Thickness
STM Steam WWP Working Water Pressure
SVC Service XS Extra Strong
SW Socket Weld(ing) (preferred) XXS Double Extra Strong
SWG Swage

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