HEIL F8MVL - Page 42

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Table 15 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate
(Tabulated Data Based on 21,000 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
AT ALTITUDE
(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 3.2/1.5 42 3.3/1.6 42 3.4/1.6 42 3.5/1.7
925 43 3.7/1.8 43 3.8/1.8 42 3.2/1.5 42 3.3/1.6
950 43 3.5/1.7 43 3.6/1.7 43 3.7/1.8 43 3.8/1.8
975 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.7/1.7
1000 44 3.6/1.7 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7
1025 44 3.4/1.6 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6
1050 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
1075 45 3.8/1.8 44 3.2/1.5 44 3.3/1.6 44 3.4/1.6
1100 46 3.8/1.8 45 3.7/1.8 44 3.2/1.5 44 3.3/1.6
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(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 43 3.8/1.8 42 3.2/1.5 42 3.3/1.6 42 3.4/1.6
825 43 3.5/1.7 43 3.7/1.7 43 3.8/1.8 42 3.2/1.5
850 43 3.3/1.6 43 3.5/1.6 43 3.6/1.7 43 3.7/1.8
875 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7
900 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5 43 3.3/1.6
925 44 3.2/1.5 44 3.3/1.6 44 3.5/1.6 44 3.6/1.7
950 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6
975 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5
1000 46 3.5/1.7 46 3.6/1.7 46 3.8/1.8 45 3.7/1.8
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(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 43 3.5/1.7 43 3.7/1.7 43 3.8/1.8 42 3.2/1.5
800 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.7/1.7
825 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
850 44 3.4/1.6 44 3.5/1.7 44 3.6/1.7 43 3.2/1.5
875 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7
900 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5 44 3.3/1.6
925 46 3.6/1.7 46 3.7/1.8 45 3.7/1.8 45 3.8/1.8
950 46 3.4/1.6 46 3.5/1.7 46 3.7/1.7 46 3.8/1.8
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(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
4001 to
5000
(1219 to
1524)
750 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.6/1.7
775 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
800 44 3.3/1.6 44 3.4/1.6 44 3.6/1.7 43 3.2/1.5
825 45 3.8/1.8 44 3.2/1.5 44 3.4/1.6 44 3.5/1.6
850 46 3.8/1.8 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6
875 46 3.5/1.7 46 3.7/1.7 46 3.8/1.8 45 3.7/1.8
900 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8
925 47 3.6/1.7 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(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
5001 to
6000
(1524 to
1829)
725 44 3.5/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
750 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
775 45 3.7/1.8 44 3.2/1.5 44 3.3/1.6 44 3.4/1.6
800 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5
825 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8 46 3.8/1.8
850 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7
875 47 3.5/1.7 47 3.6/1.7 47 3.7/1.8 46 3.4/1.6
900 48 3.8/1.8 47 3.4/1.6 47 3.5/1.7 47 3.7/1.7