RT-SVX063E-EN
45
Table 15.
Propane (LP) – high altitude rating reduction orifice chart
Heater
size (MBh)
0-2000'
3000'
4000'
5000'
6000'
7000'
8000'
9000'
10000'
250
1.75 mm
#51
#51
#51
#52
#52
#52
#53
#53
350
#49
#50
#50
#51
#51
#51
#52
#52
#52
500
#50
#51
#51
#51
#52
#52
#52
#53
#53
850
(a)
1.65 mm
#52
#53
#53
#53
#53
#54
#54
#54
1200
1.9 mm
#49
#49
#50
#50
#50
#51
#51
#52
Note:
Orifice sizes required to reduce input ratings by 4% per every 1000’ above 2000’ per the National Fuel Gas Code Z223.1.
(a)
850,000 Btu/Hr at Sea Level input is 737,000 Btu/Hr
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