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Table 16. Propane (LP) – high altitude rating reduction orifice chart
Heater size
0-2000'
(MBh)
250
1.75 mm
350
#49
500
#50
850
(a)
1.65 mm
1200
1.9 mm
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
RT-SVX063G-EN
3000'
4000'
5000'
#51
#51
#51
#50
#50
#51
#51
#51
#51
#52
#53
#53
#49
#49
#50
6000'
7000'
8000'
#52
#52
#52
#51
#51
#52
#52
#52
#52
#53
#53
#54
#50
#50
#51
Installation
9000'
10000'
#53
#53
#52
#52
#53
#53
#54
#54
#51
#52
45
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