41
TABLE 12–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. 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
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
9001 to
10,000
600
43
2.7
43
2.8
43
2.9
43
3.0
625
43
2.5
43
2.6
43
2.6
43
2.7
650
43
2.3
43
2.4
43
2.4
43
2.5
675
43
2.1
43
2.2
43
2.3
43
2.3
700
48
3.7
43
2.0
43
2.1
43
2.2
725
48
3.5
48
3.6
48
3.7
43
2.0
PG
8J
/M
