Document 857g97XpgGN6eLoGQkgj1VQ6m
Heating Ventilating Air Conditioning Guide 1939
Table 11. Typical Calculation of Pipe Sizes on Up-Feed Riser with Flush Valve Water-Closets and Urinals (See Fig. 5)
Floor op
Blog.
Fixtures on
Floor
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
8th
4W.C.
45
2 U.
30
3 Lav.
3
180 60 9
249 249
44 109
8.5
7th
4 W. C.
45
2 U.
30
3 Lav.
3
180 60
9
..... .
249
498
28 139
8.5
6th
4 W. C.
45
2 U.
30
3 Lav.
3
180 60 9
249 747
22 164
8.5
6th
4 W. C.
45
2 U.
30
3 Lav.
3
180
60 9
4th 10 Lav.
3
249 996 30 1026
18 179
18 185
8.5 8.5
3rd 2nd
1S.S.
1 s. s.
......4 , 4
4 ,4
1030 1034
1st I s. s. 4
4 1038
18 186 18 187 18 188
8.5 8.5 8.5
Pipe . Size In.
2H
2H
3
3 3 3 3 3
Table 12. Suggested Storage Tank Sizes for Homes and Apartments
An. Yeah Service Based on Boiler Water at 180 F
Service During Heating Season Based on Boiler Water at 215 F
Tank Capacity
30 35 40 50 60 72 80 100 125 150 200 250 300 400 500
. Piping Connections
Boiler, In.
i
IK IK IK IK IK 2 2 2 2 2 2K 2K 3 3
Tank, In.
K K K K
l l l
IK IK IK IK IK IK 2 2
Number of Baths or Families
i i
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
Tank Capacity
30 40 v 52 66 82 100 120 144 160 200 250 300 400 500 600
Piping Connections
Boiler, In.
i i
i
IK IK IK IK IK 2 2 2 2 2K 2K 3
Tank, In.
X K X l l l l l IK IK IK IK 2 2 2K
Namber of Baths or Families
i
i i
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. 43. Water Supply Piping and Water Heating
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 160 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 is 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. Jf 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
i! l t _
i
t ^ \+ \
Ir
*1 t T
/
(a)
Suppl] . Suppl
t^ - l -- >Oo3..
t to
t _ 1_____________ t _ 1 1" / ... -i
(4)
t
-ao>-. f
2
At
/
a>11 -^ ay 1
>%\
. oQ.. tO y
\
> S^
(c)
I
3QQ..
tO .
l
\
3Q.
to
1
H. \ 7s
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. Table 12 gives suggested storage tank sizes for homes and apartments based on the number of families or baths.
HOT 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 supply is usually taken from this source. In smaller domestic installations the fuel-burning device is generally automatically arranged so that hot water is supplied the entire year and not merely when the boiler is used for heatinjg purposes.
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