9 Heat Flow
Page 130 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
9.2 Steam Flow Metering
9.2.1 Steam Flow Calculation
By the addition of one temperature detector it is possible to extrapolate steam flow from a boiler both
as an instantaneous value and a totalised amount over time. A full steam flow metering package is
available with just the addition of one temperature sensor to the expansion board, avoiding the cost of
an expensive steam flow meter and orifice plate that is typically accurate at the higher firing rates only.
Example 1: Steam Flow with Default Values
The fuel flow metering has been set in option 57 and commissioned for gas. The standing losses are set
default as 1% in expansion option 121. The total blowdown losses are set default as 1% in expansion
option 122. The stack losses are set as default in the MM as 15% for oil and 19% for gaseous fuels.
Figure 9.2.1.i Fuel Flow
From fuel flow metering, in the screen above the burner is currently firing at 88% with a flow rate of
24.6MMBtu/hr. The net calorific value of the fuel into the wet side of the boiler can be determined by
taking away the losses from the flow rate:
1%
1% 24,600,000
⁄
Therefore standing losses are currently 246,000 Btu/hr.
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