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)
AVG. GAS
ALTITUDE
HEAT VALUE
RANGE
FT. (M)
ALTITUDE
(BTU/CU FT.)
5001 to
6000
U.S.A.
(1524 to
1829)
6001 to
7000
U.S.A.
(1829 to
2134)
7001 to
8000
U.S.A.
(2134 to
2438)
8001 to
9000
U.S.A.
(2438 to
2743)
9001 to
10,000
(2743 to
U.S.A.
3048)
* Orifice numbers 43 are factory installed.
0.58
AT
Orifice
Manifold
No.
Pressure
725
43
3.1
750
43
2.9
775
43
2.7
800
43
2.5
825
43
2.4
850
43
2.2
875
43
2.1
900
43
2.0
675
43
3.1
700
43
2.9
725
43
2.7
750
43
2.5
775
43
2.3
800
43
2.2
825
43
2.1
850
48
3.7
650
43
2.9
675
43
2.7
700
43
2.5
725
43
2.3
750
43
2.1
775
43
2.0
800
48
3.6
825
48
3.3
625
43
2.7
650
43
2.5
675
43
2.3
700
43
2.1
725
48
3.7
750
48
3.5
600
43
2.4
625
43
2.3
650
43
2.1
675
48
3.6
700
48
3.4
725
49
3.7
775
49
3.8
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
43
3.2
43
43
3.0
43
43
2.8
43
43
2.6
43
43
2.5
43
43
2.3
43
43
2.2
43
43
2.1
43
43
3.2
43
43
3.0
43
43
2.8
43
43
2.6
43
43
2.4
43
43
2.3
43
43
2.1
43
43
2.0
43
43
3.0
43
43
2.7
43
43
2.6
43
43
2.4
43
43
2.2
43
43
2.1
43
48
3.7
43
48
3.5
48
43
2.7
43
43
2.5
43
43
2.4
43
43
2.2
43
43
2.0
43
48
3.6
48
43
2.5
43
43
2.3
43
43
2.2
43
48
3.8
43
48
3.5
48
49
3.8
48
48
3.4
48
42
0.62
0.64
Manifold
Orifice
Manifold
Pressure
No.
Pressure
3.3
43
3.4
3.1
43
3.2
2.9
43
3.0
2.7
43
2.8
2.5
43
2.6
2.4
43
2.5
2.3
43
2.3
2.1
43
2.2
3.3
43
3.4
3.1
43
3.2
2.9
43
2.9
2.7
43
2.8
2.5
43
2.6
2.3
43
2.4
2.2
43
2.3
2.1
43
2.1
3.1
43
3.2
2.8
43
2.9
2.6
43
2.7
2.5
43
2.5
2.3
43
2.4
2.2
43
2.2
2.0
43
2.1
3.6
48
3.7
2.8
43
2.9
2.6
43
2.7
2.4
43
2.5
2.3
43
2.3
2.1
43
2.2
3.7
43
2.0
2.6
43
2.7
2.4
43
2.5
2.2
43
2.3
2.1
43
2.1
3.6
48
3.7
3.4
48
3.5
3.5
48
3.6