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43
Table 14 -- Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Con’t.)
(Tabulated Data Based on 22,000 Btuh High--Heat/14,500 Btuh for Low--Heat per Burner, Derated 4 Percent for Each 1000 Ft.
Above Sea Level)
ALTITUDE
RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
5001 to
6000
(1524
to
1829)
725
43
3.4/1.5
43
3.5/1.5
43
3.6/1.6
43
3.7/1.6
750
43
3.2/1.4
43
3.3/1.4
43
3.4/1.5
43
3.5/1.5
775
44
3.4/1.5
44
3.5/1.5
43
3.2/1.4
43
3.3/1.4
800
44
3.2/1.4
44
3.3/1.4
44
3.4/1.5
44
3.5/1.5
825
46
3.8/1.7
45
3.8/1.6
44
3.2/1.4
44
3.3/1.4
850
46
3.6/1.6
46
3.7/1.6
46
3.8/1.7
45
3.8/1.6
875
47
3.8/1.7
46
3.5/1.5
46
3.6/1.6
46
3.7/1.6
900
47
3.6/1.6
47
3.8/1.6
46
3.4/1.5
46
3.5/1.5
ALTITUDE
RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
6001 to
7000
(1829
to
2134)
675
43
3.4/1.5
43
3.5/1.5
43
3.6/1.6
43
3.7/1.6
700
44
3.6/1.6
43
3.3/1.4
43
3.4/1.5
43
3.5/1.5
725
44
3.4/1.5
44
3.5/1.5
44
3.6/1.6
43
3.2/1.4
750
45
3.8/1.7
44
3.3/1.4
44
3.4/1.5
44
3.5/1.5
775
46
3.7/1.6
45
3.7/1.6
45
3.8/1.7
44
3.2/1.4
800
46
3.5/1.5
46
3.6/1.6
46
3.8/1.6
45
3.7/1.6
825
47
3.7/1.6
46
3.4/1.5
46
3.5/1.5
46
3.6/1.6
850
47
3.5/1.5
47
3.6/1.6
47
3.8/1.6
46
3.4/1.5
ALTITUDE
RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
7001 to
8000
(2134
to
2438)
650
44
3.6/1.6
43
3.2/1.4
43
3.4/1.5
43
3.5/1.5
675
44
3.3/1.5
44
3.5/1.5
44
3.6/1.6
43
3.2/1.4
700
45
3.8/1.6
44
3.2/1.4
44
3.3/1.4
44
3.4/1.5
725
46
3.7/1.6
46
3.8/1.7
45
3.7/1.6
44
3.2/1.4
750
46
3.4/1.5
46
3.6/1.5
46
3.7/1.6
46
3.8/1.6
775
47
3.6/1.6
47
3.8/1.6
46
3.4/1.5
46
3.6/1.5
800
47
3.4/1.5
47
3.5/1.5
47
3.7/1.6
47
3.8/1.6
825
48
3.7/1.6
48
3.8/1.6
47
3.4/1.5
47
3.6/1.5
ALTITUDE
RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
8001 to
9000
(2438
to
2743)
625
44
3.3/1.5
44
3.5/1.5
44
3.6/1.6
43
3.2/1.4
650
45
3.7/1.6
44
3.2/1.4
44
3.3/1.4
44
3.4/1.5
675
46
3.6/1.6
46
3.8/1.6
45
3.7/1.6
45
3.8/1.7
700
47
3.8/1.7
46
3.5/1.5
46
3.6/1.6
46
3.7/1.6
725
47
3.6/1.6
47
3.7/1.6
47
3.8/1.7
46
3.5/1.5
750
48
3.8/1.7
47
3.5/1.5
47
3.6/1.6
47
3.7/1.6
775
48
3.6/1.5
48
3.7/1.6
48
3.8/1.7
47
3.5/1.5
USA
9001 to
10,000
2743 to
3048)
600
45
3.7/1.6
45
3.8/1.7
44
3.3/1.4
44
3.4/1.5
625
46
3.6/1.6
46
3.7/1.6
46
3.8/1.7
45
3.8/1.6
650
47
3.8/1.6
46
3.4/1.5
46
3.6/1.5
46
3.7/1.6
675
47
3.5/1.5
47
3.6/1.6
47
3.7/1.6
46
3.4/1.5
700
48
3.7/1.6
48
3.8/1.7
47
3.5/1.5
47
3.6/1.6
725
48
3.5/1.5
48
3.6/1.6
48
3.7/1.6
48
3.8/1.7
* Orifice numbers 43 are factory installed
58C
V