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Integrity Test Procedure
Evaluation.
The enclosure and immediate surrounding
area is initially examined visually to assess the readiness
for testing, the existence of any attached spaces that could
affect the results, and that there is an adequate relief
area and return air path�� The volume of the enclosure
is confirmed and the highest equipment measured to
ascertain the required level for retention time��
Preparation.
All doors outside the area that are required to
be open for the test are wedged open with suitable notices
posted to advise personnel�� Where voids are protected by
FM-200
®
, tiles are removed to ensure a uniform air flow��
The enclosure is put in the state it would be in prior
to a discharge, e��g�� ventilation system shut down, dampers
closed, etc��
Note.
Equipment within the enclosure that does not affect
the integrity may be left running even if it will be shut
down in the event of a discharge, preventing unnecessary
disruption and inconvenience��
Ventilation.
Air conditioning and/or forced ventilation
can affect the system performance and the quantity of
agent required��
(i) Self-contained air conditioning unit
A self-contained unit conditions the air within the
enclosure and does not rely on a fresh air supply, or draw
air from other parts of the building�� If the hazard has a self-
contained unit and it is located within the area without an
outside air supply, no additional agent is required�� It is not
necessary to shut down the unit prior to a discharge as the
mixing effect is beneficial�� However if the air-conditioning
unit is left running, a depleting concentration rather than
a descending FM-200
®
/air interface will be formed�� The
concentration will be depleted due to leakage�� Therefore
overgassing the enclosure may help to obtain the required
ten minute retention time at minimum concentration��
(ii) Central air conditioning unit
A central air conditioning unit relies on air from outside
and is often linked by ducts to other parts of the building,
therefore, prior to a discharge, the unit should be shut down
and/or dampers operated to close the ducts�� Sufficient time
must be allowed for the plant to stop, or dampers to close,
before discharge occurs��
Dampers should be installed in both supply and return
air ducts, as close as possible to the area�� The duct volume
between the hazard and the damper must be added to the
overall volume��
Door Fan Installation.
A door fan unit is installed in the
designated test door in accordance with the manufacturer’s
instructions��
The gauges are zeroed by taking them to full scale
deflection and holding for approximately ten seconds,
after which the gauges are gently tapped and zeroed��
Enclosure Evaluation
Static Pressure Measurements.
With the door fan
equipment fully installed and set up, but with all openings
closed, a measurement of any pressure difference
between the enclosure and the relief area is made�� If the
measurement is unduly high its causes are ascertained and
if possible permanently reduced or eliminated��
Total Enclosure Leakage Method.
Using an adequate
range on one fan, or a number of fans, a pressure difference
of between column pressure and column pressure plus
30% is created�� The pressure difference, and the air flow
required to generate this, is then recorded�� This is carried
out for both pressurisation and depressurisation modes��
The total equivalent leakage area and the predicted
retention time is calculated��
Suspended Ceiling Leakage Neutralisation Method.
This procedure is used to improve the accuracy of the
predicted retention time where a reasonable air-tight
ceiling exists, whether or not the ceiling is protected with
FM-200
®
��
Note.
Leak paths through the ceiling may be temporarily
sealed��
The volumes above and below the false ceiling are
depressurised to the same extent but using separate fans��
This is confirmed by using cool chemical smoke to check
that no air is flowing through the false ceiling��
Readings of the pressure difference between the
enclosure, relief area, and the air flow through the fan(s)
used to depressurise the room and false ceiling are made,
and then the procedure is repeated in the pressurisation
mode�� The below ceiling leakage area is then calculated
and used in conjunction with the ELA to predict a revised
retention time��
SECTION 6 - INTEGRITY TESTING
FM-200® (UL/FM)
14A-07H
02
2010-03
Содержание FM-200
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