MIL-HDBK-1003/7
determine the condenser pressure with an ambient wet bulb temperature, that is exceeded
not more than 1 percent of the time. Under the latter condition and maximum turbine
load, the condenser pressure should not exceed 4 inches Hg Abs. Using the peak ambient
wet bulb of record and maximum turbine load, the calculated condenser pressure should
not exceed 4-1/2 inches Hg Abs. The turbine exhaust pressure monitor is usually set to
alarm at 5 inches Hg Abs, which is near the upper limit of exhaust pressure used as a
basis for condensing turbine design.
7.2.3
Cooling Water Temperatures
Inlet Temperature. Economical design of condensers usually results in a
7.2.3.1
temperature difference between steam saturation temperature (ts) corresponding to
(11 degrees C) to 30 degrees F (17 degrees C). Table 13 shows typical design
conditions:
Table 13
Typical Design Conditions for Steam Condensers
+)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
*
*
Cooling Water Temp.
Condenser Pressure
ts - t1
*
F(t1)
In. Hg Abs
Degrees, F
*
*
*
*
50
1.0
29.0
*
*
55
1.0 - 1.25
24.0 - 30.9
*
*
60
1.0 - 1.5
19.0 - 31.7
*
*
65
1.5 - 1.75
26.7 - 31.7
*
*
70
1.5 - 2.0
21.7 - 31.1
*
*
75
2.0 - 2.25
26.1 - 30.1
*
*
80
2.0 - 2.5
21.1 - 28.7
*
*
85
2.5 - 3.0
23.7 - 31.1
*
*
90
3.0 - 3.5
25.1 - 30.6
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7.2.3.2
Terminal Difference. The condenser terminal difference is the difference in
temperature between the steam saturation temperature (ts) corresponding to condenser
will result with t2 in the range of 5 degrees F (2.8 degrees C) to 10 degrees F (5.6
degrees C) lower than ts. The HEI Conditions limits the minimum terminal temperature
difference that can be used for condenser design to 5 degrees F (2.8 degrees C).
Temperature Rise. The difference between inlet and outlet cooling water
7.2.3.3
temperatures is called the temperature rise that will be typically between 10 degrees F
(5.6 degrees C) and 25 degrees F (13.9 degrees C).
99
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