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TABLE OF UNDERWRITERS FIRE PUMPS- Continued.

Capacity at
Full Speed.

Ratio of
Piston

Areas.

SIZE OF PUMP.

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14 X 7 X 12.

Ordinary size for small Mills.

Exact capacity is 484 gals. per minute. This needs steam boilers of 100 horsepower capacity to drive pump at rated full speed and maintain 100 lbs. water pressure easily, but will work with 80 horse-power. A steam pressure of at least 40 lbs. at the pump needed to give this water pressure of 100 lbs. at full speed.

Several manufacturers now make this 14 x 712 x 12, which is a little better, as the exact rated capacity is 522 gals. per minute.

16 x 9 x 12.

Ordinary size for general use.

Exact capacity is 807 gals. per minute. This needs steam boilers of 115 horse-power and steam pressure of at least 45 lbs. sq. in. at the pump to drive at full speed and give 100 lbs. sq. in. water pressure.

For cases where boiler pressure is unusually low (less than fifty pounds), use a pump with larger (4 to 1) steam cylinder.

18 X 10 X 12.

Size for large Factories.

Exact capacity is 1004 gals per minute. Requires 150 horse-power boiler capacity and at least 44 lbs. sq. in. steam pressure.

Sometimes, for very large Factories.
20 X 12 X 16.

Exact capacity is 1655 gallons per minute, and pump will readily deliver this, or seven standard streams, if set on a firm foundation and with short suction.

Requires about 200 horse-power boiler and 50 lbs. steam pressure.

(Two smaller pumps with same aggregate capacity are ordinarily preferred, if there is no other water supply; because when one is under repair the other will be available).

It is very rare that a smaller pump than 14 x7x1 should be installed for fire service, because although present boiler may be too small to run this at full speed, a small boiler will drive a 500-gallon pump at the 300-gallon speed with very nearly as good economy as it can drive a 300 gallon pump at full speed.

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REGULAR TRADE FIRE PUMPS.-All of the leading manufacturers of pumps make regular stock sizes of fire pumps. Since the advent of the Underwriter fire pump more attention has been given to the general construction and strength of parts in these regular trade fire pumps, and as made now, they are much in advance of the old fire pump, so-called, which usually was simply an enlarged size of a regular pattern of boiler feed pump. TABLE OF TRADE DUPLEX AND FIRE PUMPS FROM MANUFACTURERS' CATALOGUES.

SIZE OF PIPE FOR SHORT

I ENGTHS.

B 3

52

C 3

10

12

D 3

12

12

D 4

12

12

D 5

12

52

12

E 3

14

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Diameter of
Diameter of
Water Cylinders.
GERRRRRGGG Steam Cylinders.

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12

12

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TABLE OF TRADE DUPLEX AND FIRE PUMPS-Continued.

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TABLE OF TRADE DUPLEX AND FIRE PUMPS-Continued.

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