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Propane (Undiluted)
Table 16: Pressure Drop 0.5 in. wc
Information in table
obtained from NFPA 54,
ANSI Z223.1
1/2
Length in ft
Capacity in Thousands of Btu per Hour
(meters)
10 (3)
291
20 (6)
200
30 (9)
160
40 (12)
137
50 (15)
122
60 (18)
110
80 (24)
101
100 (30)
94
36
Schedule 40 Metallic Pipe
Inlet Pressure:
Specific Gravity:
Nominal Pipe Size (in.)
3/4
1
608
1,150
418
787
336
632
287
541
255
480
231
434
212
400
197
372
Rinnai Tankless Water Heater Installation and Operation Manual
Rinnai Model Gas Input:
A
11 in wc
1.50
Additional Appliance Total Gas Input:
B
1 1/4
Total Gas Input:
Total Gas
Input
2,350
1,620
Total Gas
1,300
Input
1,110
Answer:
985
892
Total Gas
821
Input
763
For this example, the pipe diameter must
be at least 1/2 in. nominal pipe size and
10 ft (3 m) in length.
Table 17: Example
199,000
Btu/hr
65,000
Btu/hr
=
A
+
B
=
199,000 + 65,000
264,000
=
Btu/hr
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