Retrotec FanTestic Integrity (ISO) - Manual (Page 24)

rev-2014-10-27
Page 24 of 50
©Retrotec Inc. 2012
2. If the He calculation has not been done in previous tests, you may wish to consider the
over-ride to make the evaluation on the same basis.
Note that if H
e
is being used now, the new Standard that may be published in 2015, will give
longer hold times. If He is not used now, the new Standard will result in shorter hold times.

“Equivalent sharp interface height”
A calculated value for the height of interest, used in the calculations of hold time in certain
cases. If “Over-ride (He) calculation” checkbox is checked, the value in this box will be the same
as the value in the “Required protected height box”. If not, then FanTestic Integrity will
calculate the H
e
and enter this calculated value in the box.
On the top right, enter details about the enclosure conditions prior to discharge

“Design temperature”
Enter the minimum anticipated temperature that the enclosure could experience during a
discharge. This temperature is used to calculate the lowest (worst case) Initial
Concentration that could be achieved after a discharge.

“Bias pressure during hold time”
Enter the bias pressure during hold time conditions, as it is defined in ISO 14520 (measured
or estimated bias pressure during hold time). If the bias pressure at discharge is greater
than 25% of the Initial column Pressure, it must be reduced. Even though this IS a
requirement, many installations have massive bias pressures and will still hold concentration
but require “engineering judgment” that Retrotec can assist with if needed.
On the bottom right, enter details about the extinguishing agent and hold time calculation method: