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Hot Water Suply

When a hot-water fixture in the domestic water system is opened, preheated water from the tank is drawn through the pipe g into a header h, which conducts the water to the manifolds a. In flowing through these manifolds the water is thoroughly heated by intimate contact with the hot boiler water flowing around the copper manifold tubes.

The heated water finally departs through the outlet pipe i. This ingenious arrangement combines the advantages of an instantaneous heater with those of a storage system, and results in an appreciable economy in fuel consumption.

Capacities Of Storage Tanks

33. Determination of Tank Capacity.—The usual stock sizes and capacities of galvanized-iron storage tanks are given in Table III. Large hot-water storage tanks are generally suspended from beams by iron bands. It is much safer, how- ever, if they rest on cast-iron saddles placed on the floor.

Storage tanks generally are used in large apartment houses, and similar buildings; the storage capacity is usually based on the number of families to be supplied, and is as follows: For from ten to fifteen families, from 22 to 25 gallons for each family; for from fifteen to twenty families, 20 to 22 gallons; for from twenty to twenty-five families, 18 to 20 gallons; for from twenty-five to thirty families, 16 to 18 gallons. The capacities given have in practice been found to be ample if no laundry work is done. Should laundry work be done, however, the capacity for each family should be made at least 50 per cent larger.