A.O. Smith 3400 - Manual (Page 20)

20
TABLE
9.
SUGGESTED PIPE SIZE FOR MUL
TIPLE GAS
APPLIANCES (NA
TURAL
GAS)
Nominal
Maximum Capacity of Pipe in BTU/hr and kW for Gas Pressures of 14 in. W
.C. (0.5 psi) or Less and
Iron Pipe
a Pressure Drop of 0.5 in. W
.C. (based on 0.60 Specific Gravity Gas w/Heating V
alue of 1,000 BTU’
s/Ft3)
Size
Length of Pipe in Feet (Meters)
(Inches)
10 (3.05)
20 (6.1)
30 (9.14)
40 (12.19)
50 (15.24)
60 (18.29)
70 (21.34)
80 (24.38)
90 (27.43)
100 (30.48)
125 (38.1)
150
175
200
1 1/2
BTU/hr
2,100,000
1,460,000
1,180,000
990,000
900,000
810,000
750,000
690,000
650,000
620,000
550,000
500,000
460,000
—
kW
615
428
346
290
264
237
220
202
190
182
161
146
135
—
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
950,000
850,000
800,000
kW
1,157
805
644
556
492
445
410
381
357
337
299
278
249
234
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
1,280,000
kW
1,845
1,274
1,031
879
776
703
659
600
571
542
483
439
401
375
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
kW
3,222
2,255
1,830
1,552
1,391
1,259
1,142
1,084
1,010
952
864
776
718
668
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
5,000,000
4,600,000
kW
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
TABLE
10.
SUGGESTED PIPE SIZE FOR MUL
TIPLE GAS
APPLIANCES (PROP
ANE GAS)
Nominal
Maximum Capacity of Pipe in BTU/hr and kW for Gas Pressures of 14 in. W
.C. (0.5 psi) or Less and
Iron Pipe
a Pressure Drop of 0.5 in. W
.C. (based on 0.60 Specific Gravity Gas w/Heating V
alue of 1,000 BTU’
s/Ft3)
Size
Length of Pipe in Feet (Meters)
(Inches)
10 (3.05)
20 (6.1)
30 (9.14)
40 (12.19)
50 (15.24)
60 (18.29)
70 (21.34)
80 (24.38)
90 (27.43)
100 (30.48)
125 (38.1)
150
175
200
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
967,200
858,000
780,000
717,600
670,800
kW
959
667
539
452
41
1
370
343
315
297
283
251
228
210
196
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
kW
1,805
1,256
1,005
868
768
694
640
594
557
525
466
434
388
366
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
1,999,800
kW
2,878
1,987
1,608
1,371
1,21
1
1,097
1,028
937
891
845
754
685
626
585
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
kW
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
19
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
11,700,000
11,232,000
10,452,000
9,360,000
8,580,000
7,800,000
7,176,000
kW
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