The Golden State: Where & How to Live, Secure, Visit, Enjoy and Thrive in California

Hot Water Suply

(10) What would be the proper dimensions for a hot-water storage tank for a factory having 24 workers, assuming a per capita demand of 20 gallons per 24 hours and a peak demand at the rate of 95 gallons per hour? Ans. 22 in.x5 ft.

(11) Explain why a relief valve must be used in connection with the apparatus shown in Fig. 22.
(12) What portion of the external surface of a water front is measured to determine its heating surface?

(13) A steam heating system has 2,000 square feet of equivalent direct radiation. The hot-water heater supplied from this boiler has a capacity of 300 gallons per hour heated from 40° to 140° F. What should be the net total rating of the boiler for this job ? Ans. 3,200 sq. ft.

(14) Why should a chimney from a hot-water heater using gas as fuel be lined with corrosion-resisting material?

(15) What grate surface will be required for a water heater that is to heat 800 gallons of water per hour from 60° to 200° F., the combustion rate being estimated at 4 pounds of coal per hour per square foot of grate surface? Ans. 33.2 sq. ft.
(16) Is there any objection to bedding long straight lines of hot-water pipes in concrete? If so, state it.

(17) Where should the cold-water inlet to a hot-water storage tank be located with reference to a steam coil inside the tank ?

(18) How many square feet of heating surface will be required in a wrought-iron steam coil to heat 400 gallons ot water per hour from 60° to 200° F., the steam having a temperature of 250° F. ? Ans. 24.2 sq. ft.

(19) If a steam coil is installed in a tank for heating water, what should be the minimum distance between the bottom of the transfer manifold and the water line of the boiler?

(20) Why is the method of heating water by means of a water front not to be recommended?
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