The anti-freeze solution used shall be acceptable for extinguishing. This should be tested and
accepted by a qualified company. For anti-freeze solutions which have less extinguishing
performance than pure water, the maximum flooding time of the system must not exceed 2 mn. by
4 open sprinklers at the furthest point of the system.
This has to be checked by hydraulic calculation. The calculation must be done by considering the
physical characteristics of the anti-freeze solution at the average temperature in the cold area not
exceeding 0 °C. The usual formula to be applied will depend on viscosity
• Only materials compatible with the anti-freeze solution shall be used.
• To protect the pipe work against pressure expansion above 12 bars, appropriate measures have to
be considered. For example, a relief valve and a filling-pump should be installed above the control
valve on the riser. The relief valve should be provided with a size not exceeding 6.4 mm to operate
at pressures beneath 12 bar and not extending the dimension of the smallest sprinkler outlet to
guarantee reliability of the alarm valve (false alarm?).
• An anti-freeze solution shall be prepared with freezing point below the expected minimum
temperature for the locality.
• The specific gravity of the anti-freeze solution shall be verified by the manufacturer once a year
• A small part of the pipe work, which is filled with anti-freeze solution, should be outside the
permanently negative temperature area. In case of damage to pipe or sprinkler, it is possible to limit
the volume of water flooded pipe work by quick reaction of the user. Therefore, easy access to the
shut valves is essential. Do not extend the 2 minutes of flooding.
The anti-freeze solution used shall be acceptable for extinguishing. This should be tested and
accepted by a qualified company. For anti-freeze solutions which have less extinguishing
performance than pure water, the maximum flooding time of the system must not exceed 2 mn. by
4 open sprinklers at the furthest point of the system.
This has to be checked by hydraulic calculation. The calculation must be done by considering the
physical characteristics of the anti-freeze solution at the average temperature in the cold area not
exceeding 0 °C. The usual formula to be applied will depend on viscosity
• Only materials compatible with the anti-freeze solution shall be used.
• To protect the pipe work against pressure expansion above 12 bars, appropriate measures have to
be considered. For example, a relief valve and a filling-pump should be installed above the control
valve on the riser. The relief valve should be provided with a size not exceeding 6.4 mm to operate
at pressures beneath 12 bar and not extending the dimension of the smallest sprinkler outlet to
guarantee reliability of the alarm valve (false alarm?).
• An anti-freeze solution shall be prepared with freezing point below the expected minimum
temperature for the locality.
• The specific gravity of the anti-freeze solution shall be verified by the manufacturer once a year
• A small part of the pipe work, which is filled with anti-freeze solution, should be outside the
permanently negative temperature area. In case of damage to pipe or sprinkler, it is possible to limit
the volume of water flooded pipe work by quick reaction of the user. Therefore, easy access to the
shut valves is essential. Do not extend the 2 minutes of flooding.
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