Side
af
764
Forrige
Næste
455
OK ENGINEERING FOBMULÆ.
Table of Steam üsed Expansively.
Initial Pressure, lbs. per square inch. Average Pressure of Steam in lbs. per square inch for the whole Stroke.
■ Portion of Strohe at which Steam i» cut off. i
4 4 * 1 *
5 4-8 4'6 4-2 3-7 3-0 1-9
10 9-6 9-2 8*4 1-4 5’9 3-8
15 14-5 13’8 12-7 11-2 8’9 6’8
20 19'3 18-4 16’9 14’8 11-9 1-1
25 24-1 22’9 21-1 18-6 14'9 9'6
30 29-0 27-5 25'4 22-3 17-9 11’5
35 33-8 32'1 29-6 26-0 20-8 13-5
40 38-6 36-7 33'8 29-7 23-8 15-4
45 43'4 41-3 38-1 33-5 26-8 17'3
60 48'3 45-9 42-3 37-2 29-8 19-2
60 57-9 55'1 60-7 44-6 35-7 23-1
70 67-6 64-3 59’2 52-1 41-7 26-9
80 77-3 73-5 67-7 59’5 47'7 30-8
90 86-9 82-7 76-1 66’9 53’6 34*6
100 96*6 91-9 84-6 U-4 59’6 38-5
110 106-2 101-1 93-1 81'8 65 * 6 42-3
120 115-9 110-3 101'5 89-3 71-5 46’2
130 125’6 119’4 110-0 96’7 77'5 50-0
140 135-2 128’6 118-5 104-1 83-4 53'9
150 144-9 137-8 126-9 111-6 89-4 57-7
160 154-6 147*0 135-4 119-0 95'4 61-6
180 1V3-9 165 • 4 152’3 133’9 107'3 69*3
200 193-2 183*8 169'2 148-8 119-2 77-0
Terminal PbessujSe.
Rule for finding the Pressure at the end of the Stroke, or at
any Point during Expansion.
P — Initial pressure of steam in lbs. per square inch,
including the pressure of the atmosphere.
Z — Distance travelled by the piston before steam is cut off.
L = Distance travelled by the piston when the pressure of
the steam = X. .
X = Pressure of stram in the cylinder, including the pres-
sure of the atmosphere, when the piston has travelled
a distance L.