TAPPI TIP 0404-02:2015

This Technical Information Paper outlines a method to measure
condensing rates and blowthrough steam flows from a single dryer
cylinder. Separate methods are provided for dryers operating above
atmospheric pressure and those operating under low pressure or
vacuum. These methods require that discharge from the dryer be
temporarily diverted and collected in a drum of water.

Other methods for measuring condensing rates are outlined in TIP
0404-18 (Measurement of dryer condensing rates (vertical separator
method)) and in TIP 0404-03 (Measurement of dryer condensing rates
(continuous method)). The 0404-18 method is used most commonly for
measurement in the field, but it measures the average condensing
rate of all dryers discharging condensate into the separator tank
and it does not provide a measurement of the blowthrough flow rate.
The 0404-03 method provides measurement of both condensing rate and
blowthrough flow rates for a single dryer, but requires more
equipment and instrumentation than this method requires, at least
for dryers operating above atmospheric pressure.