A.O. Smith VB/VW- 1000 - Manual (Page 29)

29
SUGGESTED PIPE SIzING TABLES
TABLE 7. Suggested Pipe Size For Multiple Gas
Appliances (Propane 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
BTU/hr
1,060,800
725,400
585,000
499,200
—
—
—
—
—
—
—
—
—
—
kW
31
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
—
kW
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
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
TABLE 6. Suggested Pipe Size For Multiple Gas
Appliances (Natural 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
BTU/hr
680,000
465,000
—
—
—
—
—
—
—
—
—
—
—
—
kW
199
136
—
—
—
—
—
—
—
—
—
—
—
—
1
1/4
BTU/hr
1,400,000
950,000
770,000
660,000
580,000
530,000
490,000
460,000
—
—
—
—
—
—
kW
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
—
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