12 Bottom Blowdown
Mk8 MM Manual Page | 225
Example
The maximum steam flow rate, which is set through expansion option 64 as 20,000lb/hour.
In this example the 4 blowdowns are configured with the total blowdown timings (Repeats x Duration) as:
For period 2, if the average steam flow rate for that period from the Mk8 MM steam flow metering is 12,000lb/
hour, then the calculated steam flow ratio is then:
=
=
12,000
20,000
= 0.6
The total configured blowdown time over the 24 hours is:
=
+
+
+
= 10 + 10+ 10 + 10
= 40
The maximum blowdown time for period 2 is:
=
= 06: 00 00: 00 = 6
Therefore, the adjusted blowdown time is:
=
×
×
=
0.6 × × 40
= 6
The Maximum blowdown time for period 2 is 13s. Therefore, a full 6s blowdown will be carried out.
The maximum blowdown time for period 3 at full steam rate of 20,000lb/hr is:
=
= 014: 00 06: 00 = 8
Therefore, the adjusted blowdown time is:
=
×
×
=
1 × × 40
= 13.3
The Maximum blowdown time for period 3 is 10s. Therefore 3.3s is carried over to period 4.
Time Reduced Bottom Blowdown for Standalone
When using the time reduced bottom blowdown in standalone operation, the maximum steam flow rate and
the average steam flow rate are taken from the 4-20mA input to the Bottom Blowdown Module. Please see
Autoflame PC Software Guide for more information.
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