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25
Table 8 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate
(Tabulated Data Based on 22,000 Btuh High--Heat/14,500 Btuh for Low--Heat per Burner, Derated 4 Percent for Each 1000 Ft.
(305 M) Above Sea Level)
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(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
0 to
2000
(0 to 610)
900
42
3.5/1.5
42
3.6/1.6
42
3.7/1.6
41
3.5/1.5
925
42
3.3/1.4
42
3.4/1.5
42
3.5/1.5
42
3.7/1.6
950
43
3.8/1.7
42
3.3/1.4
42
3.4/1.5
42
3.5/1.5
975
43
3.6/1.6
43
3.8/1.6
42
3.2/1.4
42
3.3/1.4
1000
43
3.5/1.5
43
3.6/1.6
43
3.7/1.6
43
3.8/1.7
1025
43
3.3/1.4
43
3.4/1.5
43
3.5/1.5
43
3.6/1.6
1050
44
3.6/1.6
43
3.2/1.4
43
3.4/1.5
43
3.5/1.5
1075
44
3.4/1.5
44
3.5/1.5
43
3.2/1.4
43
3.3/1.4
1100
44
3.3/1.4
44
3.4/1.5
44
3.5/1.5
43
3.2/1.4
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(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
2001 to
3000 (610
to 914)
800
42
3.4/1.5
42
3.5/1.5
42
3.6/1.6
42
3.7/1.6
825
42
3.2/1.4
42
3.3/1.4
42
3.4/1.5
42
3.5/1.5
850
43
3.7/1.6
43
3.8/1.6
42
3.2/1.4
42
3.3/1.4
875
43
3.5/1.5
43
3.6/1.6
43
3.7/1.6
43
3.8/1.7
900
43
3.3/1.4
43
3.4/1.5
43
3.5/1.5
43
3.6/1.6
925
44
3.5/1.5
43
3.2/1.4
43
3.3/1.4
43
3.4/1.5
950
44
3.4/1.5
44
3.5/1.5
44
3.6/1.6
43
3.2/1.4
975
44
3.2/1.4
44
3.3/1.4
44
3.4/1.5
44
3.5/1.5
1000
45
3.7/1.6
45
3.8/1.7
44
3.2/1.4
44
3.4/1.5
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(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
3001 to
4000
(914 to
1219)
775
42
3.2/1.4
42
3.3/1.4
42
3.4/1.5
42
3.5/1.5
800
43
3.6/1.6
43
3.8/1.6
42
3.2/1.4
42
3.3/1.4
825
43
3.4/1.5
43
3.5/1.5
43
3.7/1.6
43
3.8/1.6
850
43
3.2/1.4
43
3.3/1.4
43
3.4/1.5
43
3.6/1.5
875
44
3.5/1.5
44
3.6/1.6
43
3.3/1.4
43
3.4/1.5
900
44
3.3/1.4
44
3.4/1.5
44
3.5/1.5
43
3.2/1.4
925
45
3.8/1.6
44
3.2/1.4
44
3.3/1.5
44
3.4/1.5
950
46
3.8/1.6
45
3.7/1.6
45
3.8/1.7
44
3.3/1.4
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
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
4001 to
5000
(1219 to
1524)
750
43
3.6/1.6
43
3.8/1.6
42
3.2/1.4
42
3.3/1.4
775
43
3.4/1.5
43
3.5/1.5
43
3.6/1.6
43
3.8/1.6
800
43
3.2/1.4
43
3.3/1.4
43
3.4/1.5
43
3.5/1.5
825
44
3.4/1.5
44
3.6/1.5
43
3.2/1.4
43
3.3/1.4
850
44
3.2/1.4
44
3.4/1.5
44
3.5/1.5
44
3.6/1.6
875
45
3.7/1.6
45
3.8/1.7
44
3.3/1.4
44
3.4/1.5
900
46
3.7/1.6
46
3.8/1.7
45
3.7/1.6
44
3.2/1.4
925
46
3.5/1.5
46
3.6/1.6
46
3.7/1.6
46
3.8/1.7
* Orifice number 43 are factory installed