PV Calculation Worksheet
PV (Pressure x Velocity) is a method of calculating bearing capacity. Revised 9/07
(F
load on bearing
÷ A )
Journal diameter
x bearing LTB
= P
 
x V
from chart below
NTE PV limit
of material
from box below
= PV
operational PV
of bearing
 
Calculate P (Pressure) by figuring F/A (force divided by area)
    F = load on the bearing
    A = journal size x length thru bore (LTB)
Use this chart to determine V (Velocity):
    1) Find row that reflects speed
    2) Find column that reflects journal size
    3) The point where these two meet is V for this application
Material Operating Limits
Limiting
PA
AA
NA
QB
QF
MA
P
800
2,000
2,000
3,000
6,000
6,000
V
50
200
350
400
400
400
PV
1,000
2,000
6,000
50,000
60,000
110,000
Bearing / Journal Surface Speed Calculations (V = Surface Feet per Minute)
1500 rpm 197 294 393 492 590 786 983 1179 1376 1572
1000 rpm 131 197 262 328 393 524 655 786 917 1048
900 rpm 118 177 236 295 354 472 590 708 826 944
800 rpm 105 157 210 262 315 420 524 628 734 838
700 rpm 92 138 184 230 276 368 459 551 642 734
600 rpm 79 118 158 197 236 316 393 472 551 629
550 rpm 73 108 145 180 217 288 361 432 505 577
500 rpm 66 98 131 164 197 262 328 393 459 524
450 rpm 59 88 118 148 177 236 295 354 413 468
400 rpm 53 79 105 131 158 210 262 315 367 420
350 rpm 46 69 92 115 138 184 230 276 321 369
300 rpm 40 59 79 98 118 158 197 236 276 315
250 rpm 33 49 66 82 99 132 164 197 230 262
200 rpm 27 39 53 66 79 106 131 158 184 210
175 rpm 23 35 46 58 69 92 115 138 161 184
150 rpm 20 30 40 49 59 80 99 118 138 158
100 rpm 14 20 27 33 40 53 66 80 92 105
75 rpm 10 15 20 25 30 40 50 60 69 79
50 rpm 7 10 14 16 20 26 33 40 46 53
25 rpm 4 5 7 8 10 13 17 20 23 26
1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 4
Journal Size (diameter in inches)
 
Marginal - double check load (P) before selecting a plane bearing
 
Not recommended to use plane bearings