Table 11--Model 58MSA Orifice Size and Manifold Pressure for Correct Input Continued
(Tabulated Data Based on 20,000 Btuh per Burner, Derated 2% for Each 1000 Ft Above Sea Levem)*
ALTITUDE
RANGE
(FT)
4001
O
<." to
5000
9%
derate
ALTBTUDE
RANGE
(FT)
500t
O
_ to
D 6000
11%
derate
ALTITUDE
RANGE
(FT)
6001
O
_ to
7000
t3%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUiCU FT)
725
750
775
800
825
850
875
900
925
950
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUiCU FT)
700
725
750
775
800
825
850
875
900
925
950
975
iO00
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUICU FT)
650
675
700
725
750
775
800
825
850
875
0.58
Orifice Manifold
No. Pressure
43 3.7
43 3.4
44 3.7
44 3.5
44 3.2
45 3.7
45 3.5
45 3.3
45 3.1
45 3.0
0.58
Orifice Manifold
No. Pressure
43 3.6
43 3.4
44 3.6
44 3.4
44 3.2
45 3.8
48 3.4
48 3.2
48 3.0
48 2.9
48 2.7
48 2.8
48 2.5
0.58
Orifice Manifold
No. Pressure
42 3.2
43 3.6
44 3.8
44 3.6
44 3.3
48 3.8
48 3.5
48 3.3
45 3.1
48 3.8
SPECIFIC GRAVITY OF NATURAL GAS
0.80
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.8
44 3.6
44 3.4
48 3.8
48 3.8
45 3.4
48 3.2
45 3.t
0.82 8.84 8.85
Orifice Manifotd Orifice Manifotd Orifice Manifold
No. Pressure No. Pressure No. Pressure
42 3.2 42 3.3 42 3.4
43 3.7 43 3.8 42 3.2
43 3.4 43 3.5 43 3.7
44 3.7 44 3.8 43 3.4
44 3.5 44 3.6 44 3.7
44 3.3 44 3.4 44 3.5
48 3.7 44 3.2 44 3.3
48 3.5 48 3.8 45 3.8
48 3.3 45 3.4 45 3.8
48 3.2 45 3.3 45 3.4
SPECIFIC GRAVITY OF NATURAL GAS
0.80
Orifice Manifold
No. Pressure
43 3.7
43 3.5
44 3.7
44 3.5
44 3.3
48 3.7
48 3.8
48 3.3
48 3.1
48 3.8
48 2.8
45 2.7
48 2.8
0.82 8.84 8.88
Orifice Manifold Orifice Manifotd Orifice Manifotd
No. Pressure No. Pressure No. Pressure
42 3.2 42 3.3 42 3.4
43 3.6 43 3.7 43 3.8
43 3.4 43 3.5 43 3.6
44 3.6 44 3.7 43 3.4
44 3.4 44 3.5 44 3.6
44 3.2 44 3.3 44 3.4
48 3.8 48 3.8 44 3.2
48 3.4 48 3.8 45 3.7
48 3.3 48 3.4 45 3.8
48 3.1 48 3.2 45 3.3
45 2.9 48 3.0 45 3.t
45 2.8 45 2.9 45 2.9
45 2.8 48 2.7 45 2.8
SPECIFIC GRAVITY OF NATURAL GAS
0.88 0.82 8.84 0.85
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure
42 3.3 42 3.4 42 3.5 42 3.6
43 3.7 43 3.8 42 3.2 42 3.3
43 3.4 43 3.6 43 3.7 43 3.8
44 3.7 44 3.8 43 3.4 43 3.5
44 3.4 44 3.6 44 3.7 44 3.8
44 3.2 44 3.3 44 3.4 44 3.5
45 3.7 48 3.8 44 3.2 44 3.3
48 3.4 48 3.8 48 3.7 45 3.8
48 3.2 48 3.4 48 3.8 45 3.6
48 3.t 45 3.2 48 3.3 45 3.4
*Orifice numbers 45 are factory installed
Percents of derate are based on midpoints of U.S. altitude ranges
41
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