Home » Piping layout » Piping Layout Drawings Abbreviations and Legends

Piping Layout Drawings Abbreviations and Legends

Whenever you start reading a piping drawing or document, you can see many abbreviations on these drawings/documents.

Many abbreviations are common and are regularly used in the drawings but few of the abbreviation are new and unique for a particular drawing.



Sometimes it happens that there are abbreviations mentioned on drawing/documents but the legend explaining the actual meaning of the abbreviation is missing.

Someone may make mistake by presuming the abbreviation and start working. My recommendation would be to request for the legend sheet and then start the work as would eliminate error at a later stage. Because, clarity in understanding is important.

Listed below are some of the commonly used abbreviations in the piping design, but it may vary from company to company and project to project:

Press Ctrl+F and then press enter to search the abbreviation
ACCESS OPENING AO DEGREES ° OR DEG
AMERICAN NATIONAL PIPE THREAD NPT DEGREE CENTIGRADE ° C
  DEGREE FAHRENHEIT ° F
AMERICAN PETROLEUM INSTITUTE API DETAILS DET
AMERICAN SOCIETY FOR TESTING    MATERIALS ASTM DIAMETER DIA
AMERICAN SOCIETY OF MECHANICALENGINEERS ASME DIMENSION DIM
AMERICAN STANDARDS  ASSOCIATION ASA DISCHARGE DISCH
  DOUBLE EXTRA STRONG XXS
AND & DRAIN DR
APPROXIMATE APPROX DRAWING DRG
   
BATTERY LIMIT B/L ECCENTRIC ECC
BEVELLED BE ELBOW EL
BEVELLED BOTH ENDS BBE ELEVATION EL
BEVELLED ONE END BOE EXTENDED SPINDLE EX.SPINDLE
BEVELLED LARGE END BLE EXTRA STRONG XS
BEVELLED SMALL END BSE EYE WASH EW
BLIND FLANGE BF  
BOTTOM BOT FABRICATED FAB
BOTTOM OF PIPE BOP FACE OF FLANGE FOF
BRITISH STANDARD BS  
BRITISH STANDARD PIPE THREAD BSPT FEET ’ OR FT
BUTT WELD BW FLANGE FLG
BUTTERFLY BUTFY FLAT FACE FF
  FIELD WELD FW
CAR SEALED CLOSED CSC FINISHED FLOOR ELEVATION FFL
CAR SEALED OPEN CSO  
CARBON STEEL CS  
   
CENTIMETER cm GASKET GSKT
CENTRE TO CENTRE C TO C GEAR OPERATED GO
CENTRE LINE ¢

 

GRADE GR
CERTIFICATE CERT  
CHAIN OPERATED CH.OP HAND HOLE HH
CHANNEL CHAN HEIGHT HT
CHECK CHK HIGH POINT OF PAVING HPP
CLEAN OUT CO HORIZONTAL HOR
COLUMN COL HOSE CONNECTION HC
CONCENTRIC CONC HYDRAULIC HYD
CONNECTION CONN  
CONTACT FACE CF  
CONTINUED CONT  
CONTINUED ON DRAWING COD  
CONTROL VALVE CV  
CORROSION CORR  
COUPLING CPLG  
INCH “ OR IN RADIUS RAD
INSIDE DIAMETER ID RAISED FACE RF
INSULATION INSUL REDUCER OR REDUCING RED
INSULATION FOR HEAT CONSERVATION IH REFERENCE REF
INSULATION FOR PERSONNEL PROTECTION IP REMOVABLE SPOOL PIECE RSP
INTERNAL INT REQUIRED REQD
INVERT ELEVATION INV.EL RING TYPE JOINT RTJ
ISOMETRIC ISO ROUND RND
   
KILOGRAMME kg SAFETY SHOWER & EYE BATCH NO SS. NO
  SAMPLE COOLER OR CONN SC
LOCKED CLOSED LC SAMPLE POINT SP
LOCKED OPEN LO SCHEDLE SCH
LONG LG SCREWED SCD
LONG RADIUS WELD ELBOW LRWE SEAMLESS SMLS
  SETTING OUT POINT SOP
MACHINE MACH SHORT RADIOUS WELD ELBOW SRWE
MANHOLE MH SLIP ON SO
MATCHLINE ML SOCKET WELD SW
MATERIAL MATL SPECIFICATION SPEC
MAXIMUM max SQUARE SQ
MEAN SEA LEVEL MSL STAINLESS STEEL SS
METER m STANDARD STD
MILLIMETRE mm STEAM STM
MINIMUM MIN STEAM OUT STM.OUT
  STEAM TRACED ST.TR
NIPPLE NIP STRAIGHT STR
NOMINAL NOM SUCTION SUCT
NOMINAL BORE NB SUPPORT SUPPT
NORMALLY CLOSED NC SURFACE SURF
NORMALLY OPEN NO SWAGE SWG
NOZZLE NOZZ SWAGED NIPPLE SN
NUMBER No  
  TANGENT TAN
OPERATING OPER TANGENT LINE TAN.LINE
ORIENTATION ORIENT TEMPERATURE TEMP
OUTSIDE DIAMETER OD TEMPORARY STRAINER TS
  TEE T
PIPE SUPPORT PS THICKNESS OR THICK THK
PAIN BOTH ENDS PBE THREADED THRD
PLAIN ONE END P0E THREADED BOTH ENDS TBE
PLAIN LARGE END PLE THREADED ONE END TOE
PLAIN SMALL END PSE THREADED LARGE END TLE
PALTE PL THREADEDSMALL END TSE
PALTEFORM PLAT TONGUE & GROOVE T& G
PRESSURE PRESS TOP LEVEL TL
  TOP OF STEEL OR SUPPORT TOS
  TYPICAL TYP
UNDER UND  
UNDERSIDE US  
UNIFIED COARSE THREAD UNC  
UNFIED FINE THREAD UNF  
   
VACUUM VAC  
VALVE VA  
VENT V  
VERTICAL VERT  
   
WALL THICKNESS WT  
WELD W  
WELD CAP WC  
WELD NECK WN  
WEIGHT W  
WORKING POINT ELEVATION WP.EL  
WORKING PRESSURE WP  




10 comments

  1. Can u please tell us how to review a 3d model???

    • Hi Veera,

      3D models can be reviewed using different review softwares eg
      Navisworks review
      Aviva review reality
      Smart plan review

      Naviesworks can be used for review of 3D model created in PDS as well as PDMS.
      Aviva review reality can be used for reviewing PDMS generated model.
      Smart plan review can be used for reviewing 3D model generated using PDS and Smart plan 3D.

  2. Above mentioned are the reviewing softwares to review models designed already in PDS, PDMS etc.

    Apart from internal reviews by lead and area engineers, there are 3 formal model reviews at Stages 30%, 60% and 90% of design completion where client will participate in the reviews.

    Below checklists may help for formal reviews-

    http://www.piping-engineering.com/piping-checklist-for-30

    http://www.piping-engineering.com/piping-checklist-for-60

    http://www.piping-engineering.com/piping-checklist-for-90

    Hope this helps.

  3. Thank you so much sir,, for your reply. But am asking that what are the basic things we need to check in model..??

  4. Mohammad Muzaffar Sultan

    in piping isometric drawing , what is SC?

  5. Nice website to resolve pipefitting problems.

  6. What is Ppe pointing to the bottom of a 12 inch butterfly valve mean on my ISO

Leave a Reply

Your email address will not be published. Required fields are marked *

*