Bryant 120/C Series - Page 49

49
Table 12 – Orifice Size and Manifold Pressure for Gas Input Rate
(Tabulated Data Based on 21,000 Btuh High-- Heat/14,500 Btuh for Low--Heat Per Burner, Derated 4 Percent for Each 1000 Ft...
Above Sea level)
ALTITUDE RANGE
(FT.)
AVG. GAS
HEAT VALUE
(BTUH/CU
FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
USA
and
Cana-
da
0to
2000
900 42 3.2/1.5 42 3.3/1.6 42 3.4/1.6 42 3.5/1.7
925 43 3.7/1.8 43 3.8/1.8 42 3.2/1.5 42 3.3/1.6
950 43 3.5/1.7 43 3.6/1.7 43 3.7/1.8 43 3.8/1.8
975 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.7/1.7
1000 44 3.6/1.7 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7
1025 44 3.4/1.6 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6
1050 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
1075 45 3.8/1.8 44 3.2/1.5 44 3.3/1.6 44 3.4/1.6
1100 46 3.8/1.8 45 3.7/1.8 44 3.2/1.5 44 3.3/1.6
SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE
(FT.)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
USA
and
Cana-
da
USA
Altitudes
2001 to
3000 or
Canada
Altitudes
2001 to
4500
800 43 3.8/1.8 42 3.2/1.5 42 3.3/1.6 42 3.4/1.6
825 43 3.5/1.7 43 3.7/1.7 43 3.8/1.8 42 3.2/1.5
850 43 3.3/1.6 43 3.5/1.6 43 3.6/1.7 43 3.7/1.8
875 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7
900 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5 43 3.3/1.6
925 44 3.2/1.5 44 3.3/1.6 44 3.5/1.6 44 3.6/1.7
950 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6
975 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5
1000 46 3.5/1.7 46 3.6/1.7 46 3.8/1.8 45 3.7/1.8
SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE
(FT.)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
USA
Only
3001 to
4000
775 43 3.5/1.7 43 3.7/1.7 43 3.8/1.8 42 3.2/1.5
800 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.7/1.7
825 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
850 44 3.4/1.6 44 3.5/1.7 44 3.6/1.7 43 3.2/1.5
875 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7
900 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5 44 3.3/1.6
925 46 3.6/1.7 46 3.7/1.8 45 3.7/1.8 45 3.8/1.8
950 46 3.4/1.6 46 3.5/1.7 46 3.7/1.7 46 3.8/1.8
SPECIFIC GRAVITY OF NATURAL GAS
ALTITUDE RANGE
(FT.)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
USA
Only
4001 to
5000
750 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.6/1.7
775 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
800 44 3.3/1.6 44 3.4/1.6 44 3.6/1.7 43 3.2/1.5
825 45 3.8/1.8 44 3.2/1.5 44 3.4/1.6 44 3.5/1.6
850 46 3.8/1.8 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6
875 46 3.5/1.7 46 3.7/1.7 46 3.8/1.8 45 3.7/1.8
900 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8
925 47 3.6/1.7 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7
* Orifice numbers 43 are factory installed
315A