Bryant 310A Installation, Start--Up, Operating, And Service And Maintenance page 42

Table 13–Orifice Size* and Manifold Pressure for Gas Input Rate (Continued)
(Tabulated data based on 22,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
AVG. GAS
ALTITUDE RANGE HEAT VALUE
AT ALTITUDE
FT. (M)
(BTU/CU FT.)
5001 to
6000
U.S.A.
(1524
Only
to
1829)
6001 to
7000
U.S.A.
(1829
Only
to
2134)
7001 to
8000
U.S.A.
(2134
Only
to
2438)
8001 to
9000
U.S.A.
(2438
Only
to
2743)
9001 to
10,000
U.S.A.
(2743
Only to
3048)
* Orifice numbers 43 are factory installed.
0.58
Orifice Manifold
No. Pressure
725 43 3.4
750 43 3.2
775 43 3.0
800 43 2.8
825 43 2.6
850 43 2.5
875 43 2.3
900 43 2.2
675 43 3.4
700 43 3.1
725 43 2.9
750 43 2.7
775 43 2.6
800 43 2.4
825 43 2.3
850 43 2.1
650 43 3.1
675 43 2.9
700 43 2.7
725 43 2.5
750 43 2.4
775 43 2.2
800 43 2.1
825 48 3.7
625 43 2.9
650 43 2.7
675 43 2.5
700 43 2.3
725 43 2.2
750 43 2.0
600 43 2.7
625 43 2.5
650 43 2.3
675 43 2.1
700 48 3.7
725 48 3.5
775 48 3.6
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.5 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.7 43
43 2.5 43
43 2.4 43
43 2.3 43
43 3.5 43
43 3.3 43
43 3.0 43
43 2.8 43
43 2.7 43
43 2.5 43
43 2.3 43
43 2.2 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 2.8 43
43 2.6 43
43 2.4 43
43 2.2 43
43 2.1 43
43 2.8 43
43 2.6 43
43 2.4 43
43 2.2 43
43 2.0 43
48 3.6 48
48 3.7 43
42
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.6 43 3.7
3.4 43 3.5
3.2 43 3.3
3.0 43 3.1
2.8 43 2.9
2.6 43 2.7
2.5 43 2.6
2.3 43 2.4
3.6 43 3.7
3.4 43 3.5
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.6 43 2.7
2.4 43 2.5
2.3 43 2.4
3.4 43 3.5
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.5 43 2.6
2.4 43 2.4
2.2 43 2.3
2.1 43 2.2
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.5 43 2.6
2.3 43 2.4
2.2 43 2.2
2.9 43 3.0
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
2.0 43 2.1