183
A
Annex P
Addition of foam concentrate
The compliance with local environmental rules and regulations for the design, testing, drainage, system
run off or other potential environmental requirements shall be checked.
Foam concentrate utilized in system shall be suitable for the fuel or chemical being protected. Where fuel
or chemical being protected is miscible or soluble, (able to mix with water), an alcohol resistant foam
concentrate shall be utilized.
Only compatible materials with the foam concentrate or foam solution shall be installed in the system.
The foam concentrate manufacturer shall publish compatible materials to be utilized on the system.1
Type of installation.
Means shall be provided to allow a test of the alarm devices without injection of foam agent.
P.1.1 Wet Systems
For wet system the pipework shall be designed so that it takes the water maximum one minute to flow
from the foam injector to the most remote sprinkler assuming that only one sprinkler is open.
P.1.2 Premix solution
Where pre-mix solution is maintained in the system piping, periodic sampling of the solution located in
the sprinkler piping shall be tested in accordance with the foam manufacturers requirements but at least
once a year.. Periodic testing will be based on need, as water quality and jobsite conditions will vary. Test
samples shall be tested by an independent laboratory specializing in such testing or by the foam
concentrate manufacturer. .
The sample shall be collected via special valves at the pipework at least on three points:
x the inlet of the foam agent,
x at the centre or at thermally stressed points of the ceiling pipework,
x at the end of the pipework.
Pass/fail criteria for the foam solution shall be based upon spread-ability, expansion (if applicable) and
foaming / wetting ability.
Note: This may be done in accordance with the relevant parts of EN 1568.
Valves for testing foam solution shall be identified with a permanent label or sign. Label or sign shall read
“Foam Solution Test Valve”.
If the test result does not meet the requirement the pipework shall be emptied, flushed and filled with
new premix. If pre-mix solution continually fails, a test of the water supply or investigation of
contamination may be required. If contamination is present, the offending product must be replaced.
P1.3 Dry systems
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