Noritz GQ-C2857WS-FF US Installation Manual page 23

Table 3. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of
BtuH (0.5" WC Pressure Drop) [Schedule 40 Metallic Pipe]
Pipe
10' 20'
Size
(3m) (6m)
1/2" 291 200
3/4" 608 418
1" 1,150 787
1 1/4" 2,350 1,620
1 1/2" 3,520 2,420
2" 6,790 4,660
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.
Length (including fittings)
30' 40' 50'
(9m) (12m) (15m)
160 137 122
336 287 255
632 541 480
1,300 1,110 985
1,940 1,660 1,480
3,750 3,210 2,840
CAUTION
60' 80' 100'
(18m) (24m) (30m)
110 101 94
231 212 197
434 400 372
892 821 763
1,340 1,230 1,140
2,570 2,370 2,200
125' 150' 175'
(38m) (45m) (53m)
89 84 74
185 175 155
349 330 292
716 677 600
1,070 1,010 899
2,070 1,950 1,730
200'
(60m)
67
140
265
543
814
1,570
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