Page 608 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

574 Applied Process Design for Chemical and Petrochemical Plants

A-3.
Synchronous Speeds

Frequency x 120
Synchronous Speed = No. of Poles
-· - -
FREQUENCY FREQUENCY

Poles i 60 cycle I i 50 cycle 25 cycle PolH 60 cycle I 50 cycle
2 I 3600 3000 1500 ,2 171.4 142.9
" 1800 1500 750 "" 163.6 136.4

6 1200 1000 500 46 156.5 130.4
I
8 900 750 375 48 150 125
10 720 600 300 50 1'4 120
12 600 500 250 52 138.5 115.4
1' 514.3 428.6 214.3 54 133.3 111.1
,so
16 375 187.5 56 128.6 107.1
18 ,oo 333.3 166.7 58 12,.1 103.5
20 360 300 150 60 120 100
22 327.2 272 .7 136.4 62 116.1 96.8
2' 300 250 125 6' 112.5 93.7
26 276.9 230.8 115.4 66 109.1 90.9
28 257.1 21'.3 107.1 68 105.9 88.2
30 240 200 100 70 102.9 85.7

32 225 187.5 93.7 72 100 83.3
34 211.8 176.5 88.2 74 97.3 81.1
36 200 166.7 83.3 76 94.7 78.9

38 189.5 157.9 78.9 78 92.3 76.9
,o 180 150 75 80 90 75

Courtesy Ingersoll-Rand Co.
A-4.
Conversion Factors

Multiply unlh In left colu•n by PIOJMI lector below
Unlh ol ..
Lenllh .u. ....
In. I It. I yd. I I I CIII. I I le• •
I I I 0.0254
I inch I 0.0833 0.0278 - 25.40 2.540 -
I foot 12 I 0.3333 - 304.8 30.48 0.3048 -
I yord 36 3 1 - 914.4 91. 44 0.9144 -
1 mile - 5280 1760 1 - - 1609.3 1.609
1 millimeter 0.0394 0.0033 - - 1 0.100 0.001 -
1 centimeter 0.3937 0.0328 0.0109 - 10 1 0.01 -
I meter 39.37 3.281 1.094 - 1000 100 1 0.001
I kllometer - 3281 1094 0.6214 - - 1000 1

(I mlaon � 0.001 •IIIIMter)
Courtesy Ingersoll-Rand Co. (Continued on next page)