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TABLE 10—Orifice Size* and Manifold Pressure For Gas Input Rate
(Tabulated Data Based On 22,000 Btuh Per Burner, Derated 4 Percent For Each 1000 Ft Above Sea Level)
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/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
U.S.A. and Canada
0
to
2000
900 42 3.5 42 3.6 42 3.7 41 3.5
925 42 3.3 42 3.4 42 3.5 42 3.7
950 43 3.8 42 3.3 42 3.4 42 3.5
975 43 3.6 43 3.8 42 3.2 42 3.3
1000 43 3.5 43 3.6 43 3.7 43 3.8
1025 43 3.3 43 3.4 43 3.5 43 3.6
1050 44 3.6 43 3.2 43 3.4 43 3.5
1075 44 3.4 44 3.5 43 3.2 43 3.3
1100 44 3.3 44 3.4 44 3.5 43 3.2
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/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
U.S.A. and Canada
U.S.A.
Altitudes
2001
to
3000
or
Canada
Altitudes
2000
to
4500
800 42 3.4 42 3.5 42 3.6 42 3.7
825 42 3.2 42 3.3 42 3.4 42 3.5
850 43 3.7 43 3.8 42 3.2 42 3.3
875 43 3.5 43 3.6 43 3.7 43 3.8
900 43 3.3 43 3.4 43 3.5 43 3.6
925 43 3.1 43 3.2 43 3.3 43 3.4
950 43 2.9 43 3.0 43 3.1 43 3.2
975 43 2.8 43 2.9 43 3.0 43 3.1
1000 43 2.6 43 2.7 43 2.8 43 2.9
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/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
U.S.A. Only
3001
to
4000
775 42 3.2 42 3.3 42 3.4 42 3.5
800 43 3.6 43 3.8 42 3.2 42 3.3
825 43 3.4 43 3.5 43 3.7 43 3.8
850 43 3.2 43 3.3 43 3.4 43 3.6
875 43 3.0 43 3.1 43 3.3 43 3.4
900 43 2.9 43 3.0 43 3.1 43 3.2
925 43 2.7 43 2.8 43 2.9 43 3.0
950 43 2.6 43 2.7 43 2.8 43 2.8
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/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
U.S.A. Only
4001
to
5000
750 43 3.6 43 3.8 42 3.2 42 3.3
775 43 3.4 43 3.5 43 3.6 43 3.8
800 43 3.2 43 3.3 43 3.4 43 3.5
825 43 3.0 43 3.1 43 3.2 43 3.3
850 43 2.8 43 2.9 43 3.0 43 3.1
875 43 2.7 43 2.8 43 2.9 43 2.9
900 43 2.5 43 2.6 43 2.7 43 2.8
925 43 2.4 43 2.5 43 2.6 43 2.6
* Orifice numbers 43 are factory installed
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