A.O. Smith 404 - Manual (Page 21)

21
T
ABLE 15. Suggested Pipe Size For Multiple Gas
Appliances (Natural)
T
ABLE 16. Suggested Pipe Size For Multiple Gas
Appliances (Prop
ane Gas)
Length of Pipe in Feet (Metres)
Maximum Cap
acity of Pipe in BTU/hr and kW for Gas Pressures of 14 in. W
.C. (0.5 p
si) or Less and a Pressure Drop of 0.5 in. W
.C
.
(based on 0.60 S
pecific Gravity Gas w/Heating V
alue of 1,000 BTU’
s/Ft
3 )
Nominal Iron Pipe
S
iz
e
C
ap.
10 Ft.
20 Ft.
30 Ft.
40 Ft.
50 Ft.
60 Ft.
70 Ft.
80 Ft.
90 Ft.
100 Ft.
125 Ft.
150 Ft.
175 Ft.
200 Ft.
(Inches)
(3.05)
(6.10)
(9.14)
(12.19)
(15.24)
(18.29)
(21.34)
(24.38)
(27.43)
(30.48)
(38.10)
(45.72)
(53.34)
(60.96)
1 1/4"
BTU/hr
1,400,000
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
kW
4
1
0
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
1 1/2"
BTU/hr
2,100,000
1,460,000
1,180,000
990,000
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
kW
6
1
5
4
2
8
3
4
6
2
9
0
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
2
"
BTU/hr
3,950,000
2,750,000
2,200,000
1,900,000
1,680,000
1,520,000
1,400,000
1,300,000
1,220,000
1,150,000
1,020,000
- -
-
- -
-
- -
-
k
W
1,157
8
0
5
6
4
4
5
5
6
4
9
2
4
4
5
4
1
0
3
8
1
3
5
7
3
3
7
2
9
9
- -
-
- -
-
- -
-
2 1/2"
BTU/hr
6,300,000
4,350,000
3,520,000
3,000,000
2,650,000
2,400,000
2,250,000
2,050,000
1,950,000
1,850,000
1,650,000
1,500,000
1,370,000
1,28
0,000
k
W
1,845
1,274
1,031
8
7
9
7
7
6
7
0
3
6
5
9
6
0
0
5
7
1
5
4
2
4
8
3
4
3
9
4
0
1
3
7
5
3
"
BTU/hr
1
1,000,000
7,700,000
6,250,000
5,300,000
4,750,000
4,300,000
3,900,000
3,700,000
3,450,000
3,250,000
2,950,000
2,650,000
2,450,000
2
,280,000
k
W
3,222
2,255
1,830
1,552
1,391
1,259
1,142
1,084
1,010
9
5
2
8
6
4
7
7
6
7
1
8
6
6
8
4
"
BTU/hr
23,000,000
15,800,000
12,800,000
10,900,000
9,700,000
8,800,000
8,100,000
7,500,000
7,200,000
6,700,000
6,000,000
5,500,000
5,000,0
00
4,600,000
k
W
6,736
4,627
3,749
3,192
2,841
2,577
2,372
2,197
2,109
1,962
1,757
1,61
1
1,464
1,347
Length of Pipe in Feet (Metres)
Nominal Iron Pipe
Size
C
a
p
.
1
0
F
t.
2
0
F
t.
3
0
F
t.
4
0
F
t.
5
0
F
t.
6
0
F
t.
7
0
F
t.
8
0
F
t.
9
0
F
t.
100 Ft.
125 Ft.
150 Ft.
175 Ft.
200 Ft.
(Inches)
(3.05)
(6.10)
(9.14)
(12.19)
(15.24)
(18.29)
(21.34)
(24.38)
(27.43)
(30.48)
(38.10)
(45.72)
(53.34)
(60.96)
1
"
BTU/hr
1,060,800
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
kW
3
11
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
1 1/4"
BTU/hr
2,184,000
1,482,000
1,201,200
1,029,600
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
- -
-
kW
6
4
0
4
3
4
3
5
2
3
0
2
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
- - -
1 1/2"
BTU/hr
3,276,000
2,277,600
1,840,800
1,544,400
1,404,000
1,263,600
1,170,000
1,076,400
1,014,000
- -
-
- -
-
- -
-
- -
-
- -
-
k
W
959
667
539
452
4
11
370
343
315
297
- -
-
- -
-
- -
-
- -
-
- -
-
2
"
BTU/hr
6,162,000
4,290,000
3,432,000
2,964,000
2,620,800
2,371,200
2,184,000
2,028,000
1,903,200
1,794,000
1,591,200
1,482,000
1,326,000
1,
248,000
k
W
1,805
1,256
1,005
8
6
8
7
6
8
6
9
4
6
4
0
5
9
4
5
5
7
5
2
5
4
6
6
4
3
4
3
8
8
3
6
6
2 1/2"
BTU/hr
9,828,000
6,786,000
5,491,200
4,680,000
4,134,000
3,744,000
3,510,000
3,198,000
3,042,000
2,886,000
2,574,000
2,340,000
2,137,200
1,99
9,800
k
W
2,878
1,987
1,608
1,371
1,21
1
1,097
1,028
9
3
7
8
9
1
8
4
5
7
5
4
6
8
5
6
2
6
5
8
5
3
"
BTU/hr
17,160,000
12,012,000
9,750,000
8,268,000
7,410,000
6,708,000
6,084,000
5,772,000
5,382,000
5,070,000
4,602,000
4,134,000
3,822,000
3,556,800
k
W
5,026
3,518
2,856
2,421
2,170
1,965
1,782
1,690
1,576
1,485
1,348
1,21
1
1
,1
1
9
1,042
4
"
BTU/hr
35,880,000
24,648,000
19,968,000
17,004,000
15,132,000
13,728,000
12,636,000
1
1,700,000
1
1,232,000
10,452,000
9,360,000
8,580,000
7
,800,000
7,176,000
k
W
10,508
7,219
5,848
4,980
4,432
4,021
3,701
3,427
3,290
3,061
2,741
2,513
2,284
2,102
Maximum Cap
acity of Pipe in BTU/hr and kW for Gas Pressures of 14 in. W
.C. (0.5 p
si) or Less and a Pressure Drop of 0.5 in. W
.C
.
(based on 1.53 S
pecific Gravity Gas w/Heating V
alue of 2,500 BTU’
s/Ft
3 )