Piping Abbreviations

Every engineering field has its list of abbreviations to help convey information quickly and easily. Here is such list of abbreviations related to piping engineering. Hope it will be useful to new entrants as well as professionals alike.

Sr. Abbreviation Description 1 ANSI American National Standards Institute Inc 2 API American Petrolium Institute 3 ASA American Standards Association 4 Asb Asbestos (Gaskets) 5 ASME The American Society of Mechanical Engineers 6 ASTM The American Society for Testing and Materials 7 AWWA American Water Works Association 8 BBE Bevel both ends 9 Bbl Barrel 10 Bdr Bleed ring 11 BE Beveled end 12 Bfy Butterfy (valve) 13 Bld Blind (flange) 14 Bld Spectacle blind (blate between flanges) 15 BLE Bevel large end 16 Blk Black (pipe) 17 BOE Bevel one end 18 BOM Bill of materials 19 BOP Bottom of pipe 20 Brz Bronze (valve) 21 BSE Bevel small end 22 BW Buttweld

Sr. Abbreviation Description 23 Chk Check (valve) 24 CI Cast iron 25 Cm Centimeter 26 Conc Concentric 27 Cpl Coupling 28 CS Cast steel, carbon steel, cap screw 29 CSC Car seal closed 30 Csg Casing 31 CSO Car seal open 32 Csw Concentric swage 33 Cu Cubic 34 CW Chain wheel 35 CWO Chain wheel operator 36 CWP Cold water pressure 37 D&T Drill and tap 38 D&W Doped and wrapped (pipe) 39 DES Double extra strong 40 DI Ductile iron 41 Dia Diameter 42 Dim Dimension 43 Ditto Do not use this term 44 DSAW Double sub-merged arc welded (pipe) 45 Dwg # Drawing number

Sr. Abbreviation Description 46 Ea. Each 47 Ecc Eccentric 48 El Elevation (on drawing) 49 Elec Electrical 50 Ell Elbow 51 Eol Elbolet 52 ERW Electric resistance weld (pipe) 53 Esw Eccentric swage 54 EUE External upset ends 55 Ex.hvy Extra heavy 56 Ex.stg Extra strong 57 Exp jt Expansion joint 58 F&D Faced and drilled (flanged) 59 F/F Face of flange 60 FAB Fabricate/fabricator 61 FAS Free along side 62 FE Flanged ends / flow element 63 Fem Female (ends) 64 FF Flat/full face 65 Fig Figure (number) 66 Flex Flexitallic (gasket brand name) 67 Flg. Flange 68 Flgd Flanged ends / flow element 69 FOB Free on board 70 FS Forged steel 71 FSD Flat side down 72 FSU Flat side up 73 Ft Feet/foot 74 FW Field weld/fire water

Sr. Abbreviation Description 75 Gal Gallon 76 Galv Galvanised 77 GG Gauge glass 78 GJ Ground joint (union) 79 Glb Globe (valve) 80 GR Grade 81 Gsk Gasket 82 HC Hose coupling 83 Hdr Header 84 Hex Size-sided head, bolt, plug etc. 85 HN Heat number 86 Hvy Heavy 87 IBBM Iron body bronze mounted(valve) 88 ID Inside diamter 89 ID Inside diamter 90 Insi Insulation 91 IPS Iron pipe size 92 IS&Y Inside screw & yoke (valve) 93 ISO Isometric (drawing) 94 IUE Internal upset ends 95 Jkscr Jack screw 96 Jt (s) Jt. (joints) 97 JW Jacket water

Sr. Abbreviation Description 98 Lati Lateral 99 Lb (s). # Pound (s) # symbol for pounds 100 Lg Length, long, level gauge 101 Lin Ft Liner feet 102 LJ Lap joint (flange) 103 LLC Liquid level controller 104 LOL Latrolet 105 LP Line pipe 106 LR Long radius 107 M Meter/one thousand 108 M&F Male and female (ends) 109 MAT’L Materials 110 Max Maximum (a warehouse stocking level) 111 MFD Mechanical flow diagram 112 Mfg Manufacturer 113 MI Malleable iron 114 Min Minimum (a warehouse stocking level) 115 Misc Miscellaneous (schedules of pipe) 116 Mk Mark (spool piece) 117 MM Millimeter 118 MRR Materials receiving report 119 MSS Manufacturers Standards Society of the Valve and Fittings Industry 120 MTO Material take-off (from drawings) 121 NC Normally closed 122 Nip Nipple (pipe) 123 No or # Number 124 NPS Nominal pipe size 125 NPT Nominal pipe thread 126 NU Non-upset (ends)

Sr. Abbreviation Description 127 OD Outside diamter 128 Orf Orifice 129 OS&D Over short and damage (report) 130 OS&Y Outside screw and yoke (valve) 131 Oz Ounce 132 P&ID Piping and instrumentation diagram 133 PBE Plain both ends 134 Pc Piece (mark for spool pieces) 135 Pdl Paddle (a blind plate between flanges) 136 PE Plain ends 137 PI Pressure indicator (valves & gauge assembly) 138 PLE Plain large end 139 Plt Plat (steel) 140 PO # Purchase order or number 141 POE Plain one end 142 Pr Pair of items 143 Press Pressure 144 PS Pipe support 145 PSE Plain small end 146 psi Pounds per square inch 147 psig Pounts-force suqre inch, guage 148 PSV Pressure safety (relief) valve 149 PVC Poly vinyl chloride 150 PVF Pipe, valves and fittings

Sr. Abbreviation Description 151 PW Potable wter 152 Qty Quantity 153 Rad Radius 154 Rdcr Reducer 155 Rec’d Received (materials) 156 Red Reducer 157 Reqn Requisition 158 REV Revision 159 RF Raised face 160 RPM Revolutions per minute 161 RR Red rubber (gasket type) 162 RS Rising stem (valve) 163 RTE Reducing tee 164 Rtg Rating 165 RTJ Ring type joint (flange facing) 166 S/40 Schedule 40 (of pipe or fittings) 167 SC Sample connecitons 168 Sch Schedule (of pipe or fittings) 169 Scrd Screwed (ends) 170 Sdl Saddle (pipe) 171 SE Screwed ends 172 Skt Bld Skillet blind (plate between flanges) 173 Smls Seamless spec 174 SO Slip-on (flange) 175 SOL Sockolet 176 SPEC Specification 177 Spl Sht Spool sheet (from isometric drawing) 178 Sq Square feet, yards etc. 179 SR Short radius, stress relieve 180 SRL Short radius ell 181 SS Stainless steel 182 Std Standard (a pipe or fitting schedule) 183 STD Standard (a pipe or fitting schedule) 184 Stl Steel 185 Stm Steam 186 Sub Short length of pipe or rod 187 SW Socket weld 188 Swg Swage nipple 189 SWP Safe working pressure

Sr. Abbreviation Description 190 T&C Threaded and coupled 191 T&G Tongue and groove (flange facing) 192 Tbg Tubing 193 Thk Thick 194 Thr’d Threaded 195 TI Temperature indicator 196 TLE Thread large end 197 TOE Thread one end 198 TOL Threadolet 199 TSE Thread small end 200 TW Thermometer well 201 Typ Typical (repeat the same item) 202 Un Union 203 VA Valve 204 Vac Vacuum 205 Vol Volume 206 Wd Width/wide 207 WE Weld end 208 WI Wrought iron 209 WN Weld neck (flange) 210 WOL Weldolet 211 WP Working pressure 212 WT Wall thickness/weight 213 XR X-ray (at pipe welds) 214 XS Extra strong 215 XXS Double extra strong 216 Yd Yard