17
Table 3. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of
BtuH (0.5” WC Pressure Drop) [Schedule 40 Metallic Pipe]
For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Final Check
When the installation is complete, verify that inlet gas pressure for the entire gas system does not
drop below 5” WC for NG or 8” WC for LP at all appliances. This can be tested by turning on all
gas burning appliances including the water heater, then check the inlet pressure at each appliance
to verify all appliances are receiving a minimum of 5” WC for NG or 8” WC for LP. If all appliances
are not receiving the minimum inlet pressure the gas piping system may need to be changed.
CAUTION
Pipe
Size
Length (including fittings)
10'
20'
30'
40'
50'
60'
80'
100'
125'
150'
175'
200'
(3m)
(6m)
(9m)
(12m) (15m) (18m) (24m) (30m) (38m) (45m) (53m) (60m)
1/2"
291
200
160
137
122
110
101
94
89
84
74
67
3/4"
608
418
336
287
255
231
212
197
185
175
155
140
1"
1,150
787
632
541
480
434
400
372
349
330
292
265
1 1/4"
2,350
1,620
1,300
1,110
985
892
821
763
716
677
600
543
1 1/2"
3,520
2,420
1,940
1,660
1,480
1,340
1,230
1,140
1,070
1,010
899
814
2"
6,790
4,660
3,750
3,210
2,840
2,570
2,370
2,200
2,070
1,950
1,730
1,570
