Sizes of Water Pipes is Building.

Supply Branches.

Low

Pressure.

Inches.

High

Pressure.

Inches.

To bath cocks ...................................

3/4-l

1/2-3/4

To basin cocks..................................

1/2

3/8-1/2

To water-closet flush tank................

1/2

1/2t

To water-closet flush valve .............

1 - 1 1/4

3/4-1

To water-closet flush pipes...............

1 1/4-1 1/2

To sitz or foot baths..........................

1/2 -3/4

1/2t

To kitchen sinks...............................

5/8-3/4

1/2-5/8

To pantry sinks ................................

1/2

3/8-1/2

To slop sinks.........................

5/8-3/4

1/2-5/8

To urinals .........................................

5/8-3/4

1/2-5/8

Kitchen Boilers

Iron boilers, or hot-water storage tanks, should be galvanized both outside and inside, particularly inside. These boilers are commonly made of mild steel, and are not so durable as the old-time wrought-iron boilers. Many of the poorer grades become pitted very rapidly, and are not to be recommended for first-class work. The longitudinal seams are either single or double riveted; when double riveted, the rivets should be staggered.

Copper range boilers are in every case to be preferred, if properly coated inside with block tin. They are classed as light, heavy and extra heavy, the latter being tested to 150 lb. water pressure. The best forms of copper boilers are those which are reinforced inside by stiffeners or braces so that they will not collapse when a partial vacuum is formed within them.

Ordinary steel or iron boilers are tested to 150 lb. water pressure, and extra heavy ones to 250 lb. pressure. The latter should always be used when the street pressure is more than 40 lb. by the gauge, or when a water hammer may at any time come upon the plumbing system.

Standard Sizes Of Galvanized Boilers

Capacity.

Gal.

Length.

Ft.

Diameter

In.

18

3

12

21

3 1/2

12

24

4

12

24

8

14

27

4 1/2

12

28

3 1/2

14

30

5

12

32

4

14

85

5

13

86

6

12

36

4 1/2

14

40

5

14

42

4

16

47

4 1/2

16

Capacity. Gal.

Length. Ft.

Diameter. In.

48

6

14

52

5

16

53

4

18

63

6

16

66

5

18

79

6

18

82

5

20

98

6

20

100

5

22

120

6

22

120

5

24

144

6

24

168

7

24

182

8

24

The size of boiler which should be employed for any particular work depends chiefly upon existing conditions, such, for example, as the water supply and the nature of the building. A safe rule is to allow a 35- or 40-gal. boiler for a building having one bathroom, and to add 30 gal. additional capacity for every extra bathroom. The size can only be computed by first ascertaining the maximum quantity of hot water which will be drawn off in a given time, and the nature of the heating agents which warm the water.

The size of the waterback is another item which cannot be calculated, because it is based on the size of the boiler or the quantity of water to be heated in a given time. In practice it is found that about 100 sq. in. of waterback heating surface in actual contact with the fire is sufficient to give good results with a 40-gal. boiler if water is plentiful, and with a 50-gal. boiler if water is scarce.

Standard Sizes Of Galvanized Boilers 366

Fig. 15.