A.O. Smith VB/VW-500 - Manual (Page 23)

23
T
able 8. Suggested Pipe Size For Multiple 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 p
si) or Less and
Iron Pipe
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/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)
1
5
0
1
7
5
2
0
0
1
BTU/hr
1,060,800
725,400
585,000
499,200
—
—
—
—
—
—
—
—
—
—
k
W
3
1
1
212
171
146
—
—
—
—
—
—
—
—
—
—
1 1/4
BTU/hr
2,184,000
1,482,000
1,201,200
1,029,600
904,800
826,800
764,400
717,600
670,800
624,000
561,600
507,000
468,000
—
k
W
640
434
352
302
265
242
224
210
196
183
164
148
137
—
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
k
W
959
667
539
452
4
1
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
1,2
48,000
k
W
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
2,137,20
0
1,999,800
k
W
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
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
12,636,0001
1,700,000
1
1,232,00010,452,000
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
T
able 7. Suggested Pipe Size For Multiple Gas
Appliances (Natural Gas).
Nominal
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
Iron Pipe
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/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)
1
5
0
1
7
5
2
0
0
1
BTU/hr
680,000
465,000
—
—
—
—
—
—
—
—
—
—
—
—
k
W
199
136
—
—
—
—
—
—
—
—
—
—
—
—
1 1/4
BTU/hr
1,400,000
950,000
770,000
660,000
580,000
530,000
490,000
460,000
—
—
—
—
—
—
k
W
410
278
226
193
170
155
144
135
—
—
—
—
—
—
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
—
k
W
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
k
W
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
1,370,00
0
1,280,000
k
W
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
k
W
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
5,000,00
0
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