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HEATINC VENTILATING AIR CONDITIONING GUIDE 1941
Table 11 Typical Calculation of Pipe Sizes on Up-Feed Riser with Flush Valve Water-Closets and Urinals (See Fig. 5)
Floor or
Bldg. 8th
7th
6th
5th
4th 3rd 2nd 1st
Fixtures
on
Floor
4 W. C. 2 U. 3 Lav.
4 W. C. 2 U. 3 Lav.
4 W. C. 2 U. 3 Lav.
4 W. C. 2 U. 3 Lav.
10 Lav.
1 s. S.
1 S. S. 1 S. S.
Gpm
PER Fixture
Maximum Gpm
on
Floor
Maximum Gpm
on
Riser
Probable Use
(per cent)
Probable
Demand Riser Gpm
Allowable Drop
Lb per 100 Ft
Pipe
Size In.
45 180 30 60
30
249 249
44 109
8.5 2.
45 180 30 60
39
249 498
28 139
8.5 2H
45 180 30 60
39
249 747
22 164
8.5 3
45 180 30 60
39
249 996
18 179
3
30 1026
18 185
4
4 1030
18 186
4
4 1034
18 187
4
4 1038
18 188
8.5 ) 3 8.5 3 8.5 3 8.5 3 8.5 3
Table 12. Suggested Storage Tank Sizes for Homes and Apartments
All Yeas Service Based on Boileb Wateb at 180 F
Tank Capacity
Gal
30 35 40 50 60 72 80 100 125 . 150 200 250 300 400 500
Piping Connections
Boiler. In.
i1x
ix IX IX ix
2 2 2 2 2
2X 2X
3 3
Tank, In.
X X X X 1 1 1 IX
IiXx iiixxx
2 2
Number of Baths or Families
1 1
1-2 1-2 1-2 2-3 2-3 3-4 4-5 5-6 6-7 7-9 9-11 11-15 15-18
Service Dobino Heating Season Based on Boileb Wateb at 215 F
Tank Capacity
30 40 52 66 82 100 120 144 160 200 250 300 400 500 600
Piping Connections
Boiler, In.
1 1
1iiiiixxxxx
2 2 2 2
2X 2X
3
Tank, In.
X X X 1 1 1 1 1
\iiiXxxx
2 2
2X
Number at Baths or
' Families
1 1 1
1-2 2-3 3 4 5 6 6-7 7-9 9-11 11-15 15-18 18-21
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CHAPTER 45. WATER SUPPLY PIPING AND WATER HEATINC
water demand can be heated during periods of light demand and stored up for use during the periods of heavy demand. The total water con sumption per person usually varies between 100 and 150 gal per day when laundry and culinary operations for the occupants are carried out on the same premises. The maximum hourly demand under these conditions will be found to be about one-tenth of the average daily consumption.
If one-third of the total water used is hot water and 125 gal per day are assumed as a fair average of consumption per person, it is apparent that each person uses about 40 gal of hot water per day. If one-tenth of this represents the peak hourly load, then 4 gph must be allowed per person for the heaviest demand. If the average occupancy of apartments is 3 persons, the peak hour demand per apartment will be about 12 gph. It is customary to allow 10 gph of heating capacity per apartment. Water in excess of this heating capacity drawn out during the peak hours is
Vent
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->*
1 i I i-a.
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a.
a
2 | 1^C 3
5 v>
<30
0.
y3
CO
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3 CO
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*_ i
/ j S> 0 j.O /rf
(a) (6)
(c)
Fig. 7. Methods of Arranging Hot Water Circulation Lines
provided for by storage in the hot water tank where this water is heated during hours when the demand is below the average. In single homes,
hot water use averages 20 gal per day per person. Table 12 gives sug gested storage tank sizes for homes and apartments based on the number of families or baths.
WATER HEATERS
Various types of heaters are available for supplying the hot water for domestic service in buildings. In any hot water supply system the water should be heated to a temperature between 150 and 180 F. Where the hot water requirements include supplies for kitchens, laundries or process' work, the higher temperatures are used. In buildings where steam is available throughout the year, the hot water supplyjs usually taken from this source. In smaller domestic installations the fuel-burning device is generally automatically arranged so.that hotswater is supplied the,entire year and not merely when the boiler is used for heating purposes. > ' >-i
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