500 moiuKöworth’s pocket-book
Approximate Rules fok Stationary
En gines—continued.
Rule for the Sectional Area of the Beam at Centre.
P = Total pressure on piston in lbs.
L = Length from axis of cylinder to centre of
beam (or 1 the length of beam) in inches.
D = Depth of beam in inches,
A = Sectional area of beam at centre in square
inches.
a.t pl
500 D
Depth of beam at centre = diameter of cylinder.
,, „ ends = depth at centre x 0’4.
Length of beam from centre to centre = stroke of
engine X 3.
Width of flanges at centre = | depth at centre.
„ „ ends = J width at centre.
Dimensions of Stationary Condensing
Engines. (From actual Practice.)
1 Horse-power, 1 Nominal. Diameter of 1 Cylinder. o ££ &Dp C 43 3“ ii 5s Diameter of Air-pump. 8 S W o rS tiO fl 3 1 Length of Con- I necting Rod. Diameter of Air- pump Rod. Diameter of Steam-pipe.
ta I Jn *
Area of pork Diamett Piston-
20 ins. 24 feet. 5 0 21 ins. 14-7 feet. 15-0 feet. 15*0 ins. 1 ins. 11 X2> 2-i ins. 1 ins.
30 29 6 0 21 17-8 18-0 18*0 13 X3 | 21 U
40 32f 6 0 21 20 18-0 18-0 U X3|3/r 2J- 8
50 36 6 0 19 22-2 18-0 18-0 16 X4 31 24 2| 9
60 ■391 7 0 17+ 24-5 21-0 21-0 11 X-U3J 9«
70 43 1 0 17i 26-3 21-0 21-0 17iX5 i 4| 2& lOf
80 46* 1 0 K-i 28’3 21-0 21-0 19 X5(4f 2i JI’
90 48* 8 0 15 29-7 24-0 24-0 19 X5f 41 2J 12'
100 51f 8 0 15 34-2 24-0 24-0 20 X 6 ,5| 3? 121