Payne PG8MAA Series G Installation, Start-Up, Operating And Service And Maintenance Instructions page 41

Table 16—Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate
(Tabulated data based on 21,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
ALTITUDE
RANGE
FT. (M)
0 to 2000
U.S.A.
(0 to 610)
2001 to
3000
U.S.A.
(610 to
914)
3001 to
4000
U.S.A.
(914 to
1219)
4001 to
5000
U.S.A.
(1219 to
1524)
* Orifice numbers 43 are factory installed.
AVG. GAS
0.58
HEAT VALUE
Orifice Manifold
AT ALTITUDE
No. Pressure
(BTU/CU FT.)
900 42
925 43
950 43
975 43
1000 44
1025 44
1050 44
1075 45
1100 46
800 43
825 43
850 43
875 43
900 43
925 43
950 43
975 43
1000 43
775 43
800 43
825 43
850 43
875 43
900 43
925 43
950 43
750 43
775 43
800 43
825 43
850 43
875 43
900 43
925 43
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold
No. Pressure
3.2 42 3.3
3.7 43 3.8
3.5 43 3.6
3.3 43 3.4
3.6 43 3.3
3.4 44 3.6
3.3 44 3.4
3.8 44 3.2
3.8 45 3.7
3.8 42 3.2
3.5 43 3.7
3.3 43 3.5
3.2 43 3.3
3.0 43 3.1
2.8 43 2.9
2.7 43 2.8
2.5 43 2.6
2.4 43 2.5
3.5 43 3.7
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
2.8 43 2.9
2.6 43 2.7
2.5 43 2.6
2.4 43 2.4
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.6 43 2.7
2.4 43 2.5
2.3 43 2.4
2.2 43 2.2
41
0.62
Orifice Manifold Orifice
No. Pressure No.
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.4 43
43 3.2 43
44 3.5 43
44 3.3 44
44 3.2 44
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
43 2.6 43
43 3.8 42
43 3.5 43
43 3.3 43
43 3.1 43
43 3.0 43
43 2.8 43
43 2.7 43
43 2.5 43
43 3.5 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.8 43
43 2.6 43
43 2.5 43
43 2.3 43
0.64
Manifold
Pressure
3.5
3.3
3.8
3.7
3.5
3.3
3.2
3.4
3.3
3.4
3.2
3.7
3.5
3.3
3.1
2.9
2.8
2.7
3.2
3.7
3.4
3.2
3.1
2.9
2.7
2.6
3.6
3.4
3.2
3.0
2.8
2.7
2.5
2.4