Piping Abbreviations

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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.

Piping Abbreviations

Piping Abbreviations

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
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