Orifice Size And Manifold Pressure - Payne PG95 Installation, Start-Up, Operating And Service And Maintenance Instructions

Table 22 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate
ORIFICE SIZE* AND MANIFOLD PRESSURE (IN WC) FOR GAS INPUT RATE
(TABULATED DATA BASED ON 13,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL
ALTITUDE
AVG. GAS
RANGE
HEAT VALUE
AT ALTITUDE Orifice
ft (m) (Btu/cu ft)
900
0 925
(0) 950
975
to 1000
1025
2000 1050
(610) 1075
1100
U.S.A. 800
2001 (611) 825
to 850
3000 (914) 875
900
Canada 925
2001 (611) 950
to 975
4500 (1372) 1000
775
800
3001 825
(915) 850
875
to
900
4000 925
(1219) 950
750
775
4001 800
(1220) 825
850
to 875
5000 900
(1524) 925
725
5001 750
(1525) 775
800
to
825
850
6000 875
(1829) 900
675
6001 700
(1830) 725
750
to
775
7000 800
(2133) 825
850
* Orifice numbers shown in BOLD are factory-installed.
26,000 BTUH ONLY
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60
Manifold Orifice Manifold
No. Pressure No. Pressure
44 1.8 43 1.7
44 1.7 44 1.8
44 1.6 44 1.7
44 1.6 44 1.6
44 1.5 44 1.5
44 1.4 44 1.5
44 1.3 44 1.4
44 1.3 44 1.3
44 1.2 44 1.3
43 1.7 43 1.8
43 1.6 43 1.7
44 1.8 44 1.8
44 1.7 44 1.7
44 1.6 44 1.6
44 1.5 44 1.5
44 1.4 44 1.5
44 1.3 44 1.4
44 1.3 44 1.3
43 1.7 43 1.8
44 1.8 43 1.7
44 1.7 44 1.8
44 1.6 44 1.7
44 1.5 44 1.6
44 1.4 44 1.5
44 1.4 44 1.4
44 1.3 44 1.3
43 1.7 43 1.7
43 1.6
44 1.8
44 1.7 44 1.7
44 1.6 44 1.6
44 1.5 44 1.5
44 1.4 44 1.5
44 1.3 44 1.4
44 1.3 44 1.3
43 1.7 43 1.7
44 1.8 44 1.8
44 1.7 44 1.7
44 1.6 44 1.6
44 1.5 44 1.5
44 1.4 44 1.4
44 1.3 44 1.3
44 1.2 44 1.3
43 1.8 43 1.8
43 1.6 43 1.7
44 1.7 44 1.8
44 1.6 44 1.7
44 1.5 44 1.6
44 1.4 44 1.5
44 1.3 44 1.4
44 1.3 44 1.3
72
0.62 0.64
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
43 1.7 43 1.8
43 1.6 43 1.7
44 1.8 44 1.8
44 1.7 44 1.7
44 1.6 44 1.6
44 1.5 44 1.6
44 1.4 44 1.5
44 1.4 44 1.4
44 1.3 44 1.4
43 1.8 42 1.6
43 1.7 43 1.8
43 1.6 43 1.7
44 1.8 44 1.8
44 1.7 44 1.7
44 1.6 44 1.6
44 1.5 44 1.6
44 1.4 44 1.5
44 1.4 44 1.4
43 1.8 42 1.5
43 1.7 43 1.8
44 1.8 43 1.7
44 1.7 44 1.8
44 1.6 44 1.7
44 1.5 44 1.6
44 1.5 44 1.5
44 1.4 44 1.4
43 1.8 43 1.8
43 1.7 43 1.7
43 1.6
44 1.8
44 1.7 44 1.8
44 1.6 44 1.7
44 1.5 44 1.6
44 1.4 44 1.5
44 1.4 44 1.4
43 1.8 43 1.8
43 1.7 43 1.7
44 1.8 44 1.8
44 1.7 44 1.7
44 1.6 44 1.6
44 1.5 44 1.5
44 1.4 44 1.4
44 1.3 44 1.4
42 1.5 42 1.6
43 1.7 43 1.8
43 1.6 43 1.7
44 1.7 44 1.8
44 1.6 44 1.7
44 1.5 44 1.6
44 1.4 44 1.5
44 1.4 44 1.4
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