TABLE 6—MODEL 383KAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT
(TABULATED DATA BASED ON 22,000 BTUH PER BURNER, DERATED 4 PERCENT PER 1000 FT ABOVE SEA LEVEL)
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
and
Canada
850
42
3.6
42
3.8
41
3.5
41
3.6
41
3.7
875
42
3.4
42
3.6
42
3.7
42
3.8
41
3.5
900
42
3.2
42
3.4
42
3.5
42
3.6
42
3.7
0
925
43
3.7
42
3.2
42
3.3
42
3.4
42
3.5
950
43
3.6
43
3.7
43
3.8
42
3.2
42
3.3
to
975
43
3.4
43
3.5
43
3.6
43
3.7
43
3.8
1000
43
3.2
43
3.3
43
3.4
43
3.5
43
3.6
2000
1025
44
3.5
43
3.2
43
3.3
43
3.4
43
3.5
1050
44
3.3
44
3.4
44
3.6
43
3.2
43
3.3
1075
45
3.8
44
3.3
44
3.4
44
3.5
43
3.2
1100
45
3.7
45
3.8
44
3.2
44
3.4
44
3.5
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
and
Canada
U.S.A.
775
42
3.4
42
3.5
42
3.6
42
3.7
42
3.8
Altitudes
800
43
3.8
42
3.3
42
3.4
42
3.5
42
3.6
2001
825
43
3.6
43
3.7
42
3.2
42
3.3
42
3.4
to
850
43
3.4
43
3.5
43
3.6
43
3.8
42
3.2
3000
875
43
3.2
43
3.3
43
3.4
43
3.5
43
3.6
or
900
43
3.0
43
3.1
43
3.2
43
3.3
43
3.4
Canada
925
43
2.9
43
3.0
43
3.1
43
3.2
43
3.3
Altitudes
950
43
2.7
43
2.8
43
2.9
43
3.0
43
3.1
2000
975
43
2.6
43
2.7
43
2.8
43
2.9
43
2.9
to
1000
43
2.5
43
2.5
43
2.6
43
2.7
43
2.8
4500
1025
43
2.3
43
2.4
43
2.5
43
2.6
43
2.7
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
750
43
3.8
42
3.3
42
3.4
42
3.5
42
3.6
775
43
3.6
43
3.7
43
3.8
42
3.3
42
3.4
800
43
3.4
43
3.5
43
3.6
43
3.7
43
3.8
3001
825
43
3.2
43
3.3
43
3.4
43
3.5
43
3.6
850
43
3.0
43
3.1
43
3.2
43
3.3
43
3.4
to
875
43
2.8
43
2.9
43
3.0
43
3.1
43
3.2
900
43
2.7
43
2.8
43
2.9
43
2.9
43
3.0
4000
925
43
2.5
43
2.6
43
2.7
43
2.8
43
2.9
950
43
2.4
43
2.5
43
2.6
43
2.6
43
2.7
975
43
2.3
43
2.4
43
2.4
43
2.5
43
2.6
1000
43
2.2
43
2.2
43
2.3
43
2.4
43
2.5
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
725
43
3.6
43
3.7
42
3.2
42
3.3
42
3.4
750
43
3.4
43
3.5
43
3.6
43
3.7
43
3.8
775
43
3.2
43
3.3
43
3.4
43
3.5
43
3.6
4001
800
43
3.0
43
3.1
43
3.2
43
3.3
43
3.4
825
43
2.8
43
2.9
43
3.0
43
3.1
43
3.2
to
850
43
2.6
43
2.7
43
2.8
43
2.9
43
3.0
875
43
2.5
43
2.6
43
2.6
43
2.7
43
2.8
5000
900
43
2.3
43
2.4
43
2.5
43
2.6
43
2.7
925
43
2.2
43
2.3
43
2.4
43
2.4
43
2.5
950
43
2.1
43
2.2
43
2.2
43
2.3
43
2.4
—13—
