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AVG. GAS
SPECIFIC GRAVITY OF NATURAL GAS
HEAT VALUE
0.58
0.60
0.62
0.64
AT ALTITUDE
Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
(Btu/cu ft)
No.
High/Low
No.
High/Low
No.
High/Low
No.
High/Low
900
43
3.5 / 1.5
43
3.6 / 1.5
43
3.8 / 1.6
42
3.2 / 1.3
925
44
3.8 / 1.6
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
0
950
44
3.6 / 1.5
44
3.8 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
975
44
3.4 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
44
3.8 / 1.6
to
1000
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
1025
45
3.8 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
44
3.4 / 1.5
2000
1050
45
3.6 / 1.5
45
3.7 / 1.6
45
3.8 / 1.6
44
3.3 / 1.4
1075
45
3.4 / 1.4
45
3.5 / 1.5
45
3.7 / 1.5
45
3.8 / 1.6
1100
45
3.3 / 1.4
45
3.4 / 1.4
45
3.5 / 1.5
45
3.6 / 1.5
U.S.A
.
800
43
3.8 / 1.6
42
3.2 / 1.4
42
3.3 / 1.4
42
3.5 / 1.5
Altitudes
825
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
42
3.2 / 1.4
2001
850
43
3.4 / 1.4
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
to 3000
875
44
3.7 / 1.5
44
3.8 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
or
900
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
44
3.8 / 1.6
Canada
925
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
Altitudes
950
45
3.7 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
44
3.4 / 1.4
2001
975
45
3.6 / 1.5
45
3.7 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
to 4500
1000
45
3.4 / 1.4
45
3.5 / 1.5
45
3.6 / 1.5
45
3.7 / 1.6
775
43
3.7 / 1.6
42
3.2 / 1.3
42
3.3 / 1.4
42
3.4 / 1.4
3001
800
43
3.5 / 1.5
43
3.6 / 1.5
43
3.8 / 1.6
42
3.2 / 1.3
825
44
3.8 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
43
3.7 / 1.5
to
850
44
3.6 / 1.5
44
3.7 / 1.6
44
3.8 / 1.6
43
3.4 / 1.5
875
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
4000
900
44
3.2 / 1.3
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
925
45
3.7 / 1.5
45
3.8 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
950
45
3.5 / 1.5
45
3.6 / 1.5
45
3.7 / 1.6
45
3.8 / 1.6
750
43
3.7 / 1.6
43
3.8 / 1.6
42
3.2 / 1.4
42
3.3 / 1.4
4001
775
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
800
44
3.7 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
43
3.6 / 1.5
to
825
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
43
3.4 / 1.4
850
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
5000
875
45
3.8 / 1.6
44
3.2 / 1.4
44
3.3 / 1.4
44
3.4 / 1.5
900
45
3.6 / 1.5
45
3.7 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
925
45
3.4 / 1.4
45
3.5 / 1.5
45
3.6 / 1.5
45
3.7 / 1.6
725
43
3.6 / 1.5
43
3.8 / 1.6
42
3.2 / 1.4
42
3.3 / 1.4
5001
750
43
3.4 / 1.4
43
3.5 / 1.5
43
3.6 / 1.5
43
3.8 / 1.6
775
44
3.7 / 1.5
44
3.8 / 1.6
43
3.4 / 1.4
43
3.5 / 1.5
to
800
44
3.4 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
44
3.8 / 1.6
825
44
3.2 / 1.4
44
3.3 / 1.4
44
3.4 / 1.5
44
3.6 / 1.5
6000
850
45
3.7 / 1.6
45
3.8 / 1.6
44
3.2 / 1.4
44
3.4 / 1.4
875
45
3.5 / 1.5
45
3.6 / 1.5
45
3.7 / 1.6
45
3.8 / 1.6
900
45
3.3 / 1.4
45
3.4 / 1.4
45
3.5 / 1.5
45
3.6 / 1.5
675
42
3.2 / 1.3
42
3.3 / 1.4
42
3.4 / 1.4
42
3.5 / 1.5
6001
700
43
3.6 / 1.5
43
3.7 / 1.6
43
3.8 / 1.6
42
3.3 / 1.4
725
44
3.8 / 1.6
43
3.5 / 1.5
43
3.6 / 1.5
43
3.7 / 1.6
to
750
44
3.6 / 1.5
44
3.7 / 1.6
44
3.8 / 1.6
43
3.5 / 1.5
775
44
3.4 / 1.4
44
3.5 / 1.5
44
3.6 / 1.5
44
3.7 / 1.6
7000
800
45
3.8 / 1.6
44
3.3 / 1.4
44
3.4 / 1.4
44
3.5 / 1.5
825
45
3.6 / 1.5
45
3.7 / 1.6
45
3.8 / 1.6
44
3.3 / 1.4
850
45
3.4 / 1.4
45
3.5 / 1.5
45
3.6 / 1.5
45
3.7 / 1.6
TABLE 15 - ORIFICE SIZE* AND MANIFOLD PRESSURES FOR GAS INPUT RATE
(TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER,
DERATED 2%/1000 FT ABOVE SEA LEVEL)
ALTITUDE
RANGE
(ft)
* Orifice numbers shown inBOLD are factory-installed.
U
.S.A.
and Canada
U
.S.A.
and Canada
U
.S.A.
Onl
y
U
.S.A.
Onl
y
U
.S.A.
Onl
y
U
.S.A.
Onl
y
52