Document 7M8qJEqD68r2QR79ZE85gRJ16
Heating Ventilating Air Conditioning Guide 1938
Table 11. Typical Calculation of Pipe Sizes on Up-Feed Riser with Flush Valve Water-Closets and Urinals (See Fig. 5)
Floor of
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
45 30 3
.45 30
3
45 30 3
45 30
3
3 4 4 4
Maximum Gpm
on Floor
Maximum Gpm
on Riser
Probable
Use (per cent)
Probable Demand
Riser Gpm
Allowable Drop Lb per
100 Ft
180 60
9
249 249
44 109
8.5
180 60 9
249 498
28 139
8.5
180 60 9
249 747 ` 22
164
8.5
180 60 9
249 996
18 179
8.5
30 1026
18 185
8.5
4 i030
18 186
8.5
4 1034
18 187
8.5
4 1038
18 188
8.5
Pipe Size In.
m
2H
3
3 3 3 3 3
Table 12. Suggested Storage Tank Sizes for Homes and Apartments
Ai.t.-Yiear Service Based on Boiler Water 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.. Tank, In.
Number of Baths or Families
i
. IK
m 04 m 04
2 2 2 2 2
2K
m
3 3
3A . ' 3A -
3A
l i 1-2
3A 1-2
1 1-2
1 2-3
1 2-3
04 ` 3-4 OA 4-5 .
IK. " 5-6
04 6-7
04 7-9
m 9-11
2 11-15
2 15-18
Service During Heating 8eabon Based on Boiler Water at 215 F
Tank Capacity
30 v 40 52 66 82 . 100 120 144 160 200 250 300 400 500 600
Piping Connections
Boiler, In.-
i i i IK IK IK IK
04
.2 2* 2 2 2K 2K 3
Tank, In..
3A ' 3A.
M-, 1 1 1 1 1
IK IK
04 . 04
2 2
04
Number of Baths or Families
i, i
i
1-2 2-3 3 4 . .5 6 6^7 7-9 9-11 ;il-15 15-18 . 18-21
798
' 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 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 is assumed as a fair average of consumption per person, it is apparent that each person uses about 40 gal of hot waiter 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
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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 heating purposes!
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