44 
BULLETIN 894, U. S. DEPARTMENT OE AGRICULTURE. 
The following table of pump capacities, speeds, steam supplies, 
exhausts, etc., is based on the standards used by a well-known manu- 
facturer of pumps. 
Table 9. — Standard sizes of pumps. 
Diame- 
Diameter of pipes for short 
ter of 
lengths — to be increased as 
Proper 
strokes per 
plun- 
length increases. 
Dis- 
Gallons de- 
ger re- 
quired 
in any 
single 
cylinder 
pump 
to do 
the 
same 
Diame- 
ter of 
steam- 
cylin- 
ders. 
Diame- 
ter of 
water 
plun- 
ger. 
Length 
of 
stroke. 
place- 
ment 
per 
stroke 
of one 
plun- 
ger. 
minute 
of one 
plunger, 
varying 
with kind 
of work 
and 
livered per 
minute 
by both 
plungers 
at stated 
number of 
strokes. 
Steam 
pipe. 
Ex- 
haust 
pipe. 
Suction 
pipe. 
Dis- 
charge 
pipe. 
pressure. 
work at 
same 
speed. 
Inches. 
Inches. 
Inches. 
Gallons. 
Number. 
Gallons. 
Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
3 
2 
3 
0.04 
100 to 250 
8 to 20 
2| 
1 
4 
u 
1 
44 
2| 
4 
.10 
100 to 200 
20 to 40 
4 
4 
3 
2 
14 
5i 
3+ 
5 
.20 
100 to 200 
40 to 80 
5 
1 
l| 
24 
14 
6 
4 
6 
.33 
100 to 150 
70 to 100 
68 
6| 
l 
14 
3 
2 
n 
44 
6 
.42 
100 to 150 
85 to 125 
14 
2 
4 
3 
n 
5 
6 
.51 
100 to 150 
100 to 150 
7 
14 
2 
4 
3 
n 
4| 
10 
.69 
75 to 125 
100 to 170 
Sf 
14 
2 
4 
3 
9 
5i 
10 
.93 
75 to 125 
135 to 230 
•2 
2 
24 
4 
3 
10 
6 
10 
1.22 
75 to 125 
180 to 300 
8^r 
2 
24 
5 
4 
10 
7 
10 
1.66 
75 to 125 
245 to 410 
9l 
2 
24 
6 
5 
12 
7 
10 
1.66 
75 to 125 
245 to 410 
9| 
24 
3 
6 
5 
•. 14 
7 
10 
1.66 
75 to 125 
245 to 410 
9| 
24 
3 
6 
5 
12 
84 
10 
2.45 
75 to 125 
365 to 610 
12 
24 
3 
6 
5 
14 
84 
10 
2.45 
75 to 125 
365 to 610 
12 
2| 
3 
6 
5 
16 
84 
10 
2.45 
75 to 125 
365 to 610 
12 
24 
3 
6 
5 
m 
84 
10 
2.45 
75 to 125 
365 to 610 
12 
3 
34 
6 
5 
20 
84 
10 
2.45 
75 to 125 
365 to 610 
12 
4 
5 
6 
5 
12 
10| 
10 
3.57 
75 to 125 
530 to 890 
14-i- 
24 
3 
8 
7 
14 
m 
10 
3:57 
75 to 125 
530 to 890 
14i 
24 
3 
8 
7 
16 
10| 
10 
3.57 
75 to 125 
530 to 890 
14i 
24 
3 
8 
7 
184 
10i 
10 
3.57 
75 to 125 
530 to 890 
144 
3 
34 
8 
7 
20 
10£ 
10 
3.57 
75 to 125 
530 to 890 
14i 
4 
5 
8 
7 
14 
12 
10 
4.89 
75 to 125 
730 to 1,200 
17 
4 
3 
10 
8 
CONDENSER COIL. 
The condensing coils are placed in or near the spray chamber in the 
leaving-air flue and are used at the end of a kiln run when high circu- 
lation and high humidity are not needed. They work on the same 
condensing principle as the sprays, cooling a portion of the leaving 
air to the dew-point temperature, thus condensing the moisture 
evaporated from the lumber. 
When condensers are in use the circulation of air in the kiln is pro- 
duced by the difference in pressure due to the difference in tempera- 
ture between the heated air in the entering-air flue and the cooler 
air in the spray chamber. A circulation produced by this method is 
very feeble at 50 per cent humidity and practically disappears at 75 
per cent humidity. While the use of condenser coils is more or less 
satisfactory for low humidities, particularly in long runs, the drying 
time is extended somewhat. The humidity in the kiln under such 
circumstances is controlled by regulating the amount of cold water 
admitted to the coil through the supply valve. 
