FLOW OF STEAM THROUGH PIPES
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|Initl|Diameter[81] of Pipe in Inches, Length of Pipe = 240 Diameters |
|Gauge|---------------------------------------------------------------------------------+
|Press| ¾ | 1 | 1½ | 2 | 2½ | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 15 | 18 |
|Pound|---------------------------------------------------------------------------------+
|/SqIn| Weight of Steam per Minute, in Pounds, With One Pound Loss of Pressure |
+-----+---------------------------------------------------------------------------------+
| 1 |1.16|2.07| 5.7|10.27|15.45|25.38| 46.85| 77.3|115.9|211.4| 341.1| 502.4| 804|1177|
| 10 |1.44|2.57| 7.1|12.72|19.15|31.45| 58.05| 95.8|143.6|262.0| 422.7| 622.5| 996|1458|
| 20 |1.70|3.02| 8.3|14.94|22.49|36.94| 68.20|112.6|168.7|307.8| 496.5| 731.3|1170|1713|
| 30 |1.91|3.40| 9.4|16.84|25.35|41.63| 76.84|126.9|190.1|346.8| 559.5| 824.1|1318|1930|
| 40 |2.10|3.74|10.3|18.51|27.87|45.77| 84.49|139.5|209.0|381.3| 615.3| 906.0|1450|2122|
| 50 |2.27|4.04|11.2|20.01|30.13|49.48| 91.34|150.8|226.0|412.2| 665.0| 979.5|1567|2294|
| 60 |2.43|4.32|11.9|21.38|32.19|52.87| 97.60|161.1|241.5|440.5| 710.6|1046.7|1675|2451|
| 70 |2.57|4.58|12.6|22.65|34.10|56.00|103.37|170.7|255.8|466.5| 752.7|1108.5|1774|2596|
| 80 |2.71|4.82|13.3|23.82|35.87|58.91|108.74|179.5|269.0|490.7| 791.7|1166.1|1866|2731|
| 90 |2.83|5.04|13.9|24.92|37.52|61.62|113.74|187.8|281.4|513.3| 828.1|1219.8|1951|2856|
| 100 |2.95|5.25|14.5|25.96|39.07|64.18|118.47|195.6|293.1|534.6| 862.6|1270.1|2032|2975|
| 120 |3.16|5.63|15.5|27.85|41.93|68.87|127.12|209.9|314.5|573.7| 925.6|1363.3|2181|3193|
| 150 |3.45|6.14|17.0|30.37|45.72|75.09|138.61|228.8|343.0|625.5|1009.2|1486.5|2378|3481|
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This formula is the most generally accepted for the flow of steam in
pipes. Table 66 is calculated from this formula and gives the amount of
steam passing per minute that will flow through straight smooth pipes
having a length of 240 diameters from various initial pressures with one
pound difference between the initial and final pressures.
To apply this table for other lengths of pipe and pressure losses other
than those assumed, let L = the length and d the diameter of the pipe,
both in inches; l, the loss in pounds; Q, the weight under the
conditions assumed in the table, and Q_{1}, the weight for the changed
conditions.
For any length of pipe, if the weight of steam passing is the same as
given in the table, the loss will be,
L
l = ---- (46)
240d
If the pipe length is the same as assumed in the table but the loss is
different, the quantity of steam passing per minute will be,