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Whirlpool WFM18 Installation Instructions Manual page 21

80% single-stage multispeed gas furnace

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Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most
standard commercial compounds, special pipe dope must be
used. Shellac-based compounds resistant to the actions of
liquefied petroleum gases are satisfactory.
st
nd
Sizing Between 1
and 2
Maximum propane capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 Btu/h.
Propane Gas Piping Chart I
Tubing Size, O.D. Type L
Pipe or Tubing
³⁄₈
Length—ft (m)
10 (3)
730
20 (6.1)
500
30 (9.2)
400
40 (12.2)
370
50 (15.2)
330
60 (18.3)
300
80 (24.4)
260
100 (30.5)
220
125 (38.1)
200
150 (45.7)
190
175 (53.3)
170
200 (61)
160
To convert to capacities at 15 psig settings—multiply by 1.13. To convert to capacities at 5 psig settings—multiply by 0.879.
Sizing Between Single or 2
Maximum Propane Capacities Listed are Based on ¹⁄₂" W.C. pressure drop at 11" W.C. setting. Capacities in 1,000 Btu/h.
Propane Gas Piping Chart II
Tubing Size, O.D. Type L
Pipe or Tubing
³⁄₈
Length—ft (m)
10 (3)
39
20 (6.1)
26
30 (9.2)
21
40 (12.2)
19
50 (15.2)
18
60 (18.3)
16
80 (24.4)
13
Stage Regulator*
¹⁄₂
⁵⁄₈
1,700
3,200
1,100
2,200
920
2,000
850
1,700
770
1,500
700
1,300
610
1,200
540
1,000
490
900
430
830
400
780
380
730
nd
Stage Regulator and Appliance*
¹⁄₂
⁵⁄₈
³⁄₄
92
199
329
62
131
216
50
107
181
41
90
145
37
79
131
35
72
121
29
62
104
Propane Gas Installation—Typical
A
A. 1
st
stage regulator
B. 5 to 15 psig (20 psig maximum)
³⁄₄
⁷⁄₈
5,300
8,300
3,700
5,800
2,900
4,700
2,700
4,100
2,400
3,700
2,200
3,300
1,900
2,900
1,700
2,600
1,400
2,300
1,300
2,100
1,200
1,900
1,100
1,800
Nominal Pipe Size Schedule 40
⁷⁄₈
¹⁄₂
1¹⁄₈
501
935
275
346
630
189
277
500
152
233
427
129
198
376
114
187
340
103
155
289
89
B
C
C. 2
nd
stage regulator
D. Continuous 11" W.C.
Nominal Pipe Size Schedule 40
¹⁄₂
³⁄₄
3,200
7,500
2,200
4,200
1,800
4,000
1,600
3,700
1,500
3,400
1,300
3,100
1,200
2,600
1,000
2,300
900
2,100
830
1,900
770
1,700
720
1,500
³⁄₄
1
1¹⁄₄
567
1,071
2,205
393
732
1,496
315
590
1,212
267
504
1,039
237
448
913
217
409
834
185
346
724
D
1¹⁄₂
3,307
2,299
1,858
1,559
1,417
1,275
1,066
21

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