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Table 16—Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued)
(Tabulated data based on 21,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
ALTITUDE
RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT
ALTITUDE
(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.
5001 to
6000
(1524 to
1829)
725 43 3.1 43 3.2 43 3.3 43 3.4
750 43 2.9 43 3.0 43 3.1 43 3.2
775 43 2.7 43 2.8 43 2.9 43 3.0
800 43 2.5 43 2.6 43 2.7 43 2.8
825 43 2.4 43 2.5 43 2.5 43 2.6
850 43 2.2 43 2.3 43 2.4 43 2.5
875 43 2.1 43 2.2 43 2.3 43 2.3
900 43 2.0 43 2.1 43 2.1 43 2.2
U.S.A.
6001 to
7000
(1829 to
2134)
675 43 3.1 43 3.2 43 3.3 43 3.4
700 43 2.9 43 3.0 43 3.1 43 3.2
725 43 2.7 43 2.8 43 2.9 43 2.9
750 43 2.5 43 2.6 43 2.7 43 2.8
775 43 2.3 43 2.4 43 2.5 43 2.6
800 43 2.2 43 2.3 43 2.3 43 2.4
825 43 2.1 43 2.1 43 2.2 43 2.3
850 48 3.7 43 2.0 43 2.1 43 2.1
U.S.A.
7001 to
8000
(2134 to
2438)
650 43 2.9 43 3.0 43 3.1 43 3.2
675 43 2.7 43 2.7 43 2.8 43 2.9
700 43 2.5 43 2.6 43 2.6 43 2.7
725 43 2.3 43 2.4 43 2.5 43 2.5
750 43 2.1 43 2.2 43 2.3 43 2.4
775 43 2.0 43 2.1 43 2.2 43 2.2
800 48 3.6 48 3.7 43 2.0 43 2.1
825 48 3.3 48 3.5 48 3.6 48 3.7
U.S.A.
8001 to
9000
(2438 to
2743)
625 43 2.7 43 2.7 43 2.8 43 2.9
650 43 2.5 43 2.5 43 2.6 43 2.7
675 43 2.3 43 2.4 43 2.4 43 2.5
700 43 2.1 43 2.2 43 2.3 43 2.3
725 48 3.7 43 2.0 43 2.1 43 2.2
750 48 3.5 48 3.6 48 3.7 43 2.0
U.S.A.
9001 to
10,000
(2743 to
3048)
600 43 2.4 43 2.5 43 2.6 43 2.7
625 43 2.3 43 2.3 43 2.4 43 2.5
650 43 2.1 43 2.2 43 2.2 43 2.3
675 48 3.6 48 3.8 43 2.1 43 2.1
700 48 3.4 48 3.5 48 3.6 48 3.7
725 49 3.7 49 3.8 48 3.4 48 3.5
775 49 3.8 48 3.4 48 3.5 48 3.6
* Orifice numbers 43 are factory installed.
310AAV