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American Society of Heating and Ventilating Engineers Guide, 1935
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Fig. 6. Methods of Arranging Hot Water Circulation Lines
water risers which do not have the combined up- and down-travel which
the hot water must make.
. \ :/
In the third and most common arrangement all of the water is carried from the tank or heater directly to the top of the building and is there
distributed to the risers which are down-feed and may be sized in the regular down-feed manner if the total equivalent run either from die
street main or house tank is taken into consideration. The return circulation lines from the botton of each riser should be arranged in the
mariner already outlined and any riser not going to the basement to
Table 9. Summary of Riser Sizes to Given Main Sizes (See Fig. 4)
Riser
No. 1
Fixtures
CPU PER Fixture
12 W. C. 6 U. 18 31 Fixt.
50 40
29 W. C. 5 U.
50 40
52 - 2 29 Flit;
60
6W.C. 58 10 Fixt. 70
50
Riser GPU
600 240 840 186
1450 200 2490 177 ... 363
300 2790
36 399
./!
Probable Use
(Per Cent)
Probable
gpm
Allowable Drop (Lb
per 100 Ft)
$IZB OF ' Main(Inches)
18 151 37 69
--
220
3.3
4
8 199
33 120
319 ' 3.3
'4
. 7 195
-33 131
326 . :
. 3.3 ,
- 4
614
Chapter 35--Water Supply Piping
Table 10. Typical Calculation of Pipe Sizes on Up-Feed'Riser with Flush Valve Water-Closets and Urinals (See Fig. 6)
Floor
of
BLDG.
Fixtures
on
Floor
Gpm
per
Fixture
Maximum Probable Probable Probable Allowable . Pipe
Fixtures
Use
Fixtures
Riser
Drop
Size
Gpm
(per cent)
Gpm
Gpm
Lb per 100 Ft
In.
Riser No. 1
8th
4 W. C. 2 U.
50 40
6 3 Lav.
3
200 80
280 40 9 80
7th
4 W. C.
50
2 U.
40
12 3 Lav.
3
6
200 80
560 25 9
18 55
6th
4 W. C.
50
2 U.
40
18 3 Lav.
3
9
200 80...
840 9
27
18 50
5th
4 W. C.
50
2 U.
40
200 80
24 3 Lav.
" 1120 39
12 36
15 47
4th 24 W. C.
and U.
' 1120
10 Lav.
3
30
22 66
15 40
3rd 24 W. C.
and U.
1 S. S.
4
23
:11. 240: " ' 70
2nd 24 W. C.
and U.'
1 S; S;
' 4
"1120 . 4
24... ....
. 74
'1st 24 W. C. and U. , 1 S. S.
25 /
. `From floors above.
.4.".
1120 4
78
15 '40
15 .
r i
15 40
112 7 119
8.5
140 10 150
8.5
151 14 165
8.5
168 17 185
8.5
168 27 195
168 ' v28:
196
8.5 8.5
168 30 .
198.
8.5
168
/31 . 199 ..
8.5
2K 2K
2'A
3 3 3 3 ...
3 1;
615