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Solid Bore Nozzle Flow Chart

The chart below lists the common solid bore nozzles used in testing fire pumps and their flow rating at set pressures.  All nozzle pressures are pitot gauge readings, not pump pressure gauge readings.  Flows are in U.S. gallons per minute.  We have only shown the most popular tips sizes.  If the tip size you need is not in this chart, give us a call and we can look up the information you need.  Or, if you skip to the bottom of this page, there is a formula you can use to find the answer you need.

 

Tip Size
Pressure 7/8" 1" 1-1/8" 1-1/4" 1-1/2" 2" 2-1/4"
40 144 188 238 294 423 752 951
45 153 199 252 311 448 797 1009
50 161 210 266 328 473 840 1064
55 169 220 279 344 496 881 1115
60 176 230 291 360 518 921 1165
65 183 240 303 374 539 958 1213
70 190 249 315 388 559 994 1258
75 197 257 326 402 579 1029 1303
80 203 266 336 415 598 1063 1345
85 210 274 347 428 616 1096 1387
90 216 282 357 440 634 1127 1427
95 222 290 366 452 652 1158 1466
100 227 297 376 464 668 1188 1504
105 233 304 385 476 685 1218 1541
110 239 312 394 487 701 1246 1577
115 244 319 403 498 717 1274 1613
120 249 325 412 509 732 1302 1348
125 254 332 420 519 747 1329 1682
130 259 339 429 529 762 1355 1715
135 264 345 437 539 777 1381 1748
140 269 352 445 549 791 1406 1780
145 274 358 453 559 805 1431 1811
150 279 364 461 569 819 1455 1842

 

Solid Bore Discharge Formula

D=Bore Diameter in Inches
NP=Nozzle Pressure in PSI (Pitot Pressure, Not Pump Pressure)

GPM=29.71D2*sqrt(NP)

To calculate the theoretical reaction force use this formula:
Nozzle Reaction=1.57*(D*D)*NP
 

As we said, if you don't want to go through the hassle of calculating the flow, just give us a call and we will be more than happy to help.  We have it in spreadsheet form so it is easy to do.


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Copyright © 2006 David's Fire Equipment
Last modified: 02/02/22