7-3
September 2004
Argonite
®
Engineered Fire Suppression System
38-KFSARG-000
Planned escape routes.
Fire detectors, selected based on the type of fire anticipated (response time).
Audible/visual alarms required.
Under certain conditions, it can be dangerous to extinguish a gas jet fire.
Provision must be made to be cut off the gas supply before agent discharge
begins.
As a general guideline, an extended discharge is not required in a normal, relatively tight
enclosure, i.e., EDP rooms with automatic ventilation systems that shut down upon fire
detection. However, if the enclosure is too tight, the increased pressure inside the enclosure
during/after a discharge will be relatively high.
In order to avoid structural damage due to excessive pressure, pressure relief vents should
be provided. The optimal solution would be to have spring operated vents/fire dampers,
which will be forced open when the pressure builds up at the beginning/during the discharge
and close automatically after the discharge when the pressure dissipates. Enclosure integrity
procedures are provided in NFPA 2001, Appendix C.
7-5 EVALUATION OF CYLINDER STORAGE SPACE
The following items must be considered when evaluating the cylinder storage spaces:
A standard Argonite system will operate within a temperature range of -20°F to
130°F (-29°C to 54°C).
If closed pipe sections are involved, safety reliefs are required for all closed
sections of pipe.
Pressure relief venting.
Cylinder storage room equipped with proper exhaust ventilation.
Cylinder storage space.
Allowance for proper access to cylinders during installation and service/maintenance.
Floor capable of carrying the load.
Wall/structure strong enough for mounting wall brackets supports.
Storage room should not be used for other purposes that could result in fire
exposure to cylinders.
7-6 INERTING
Inerting concentrations shall be used where conditions for subsequent reflash or
explosion could exist. These conditions exist when:
The quantity of fuel expected to be in the enclosure is sufficient to develop a
concentration equal to or greater than one-half of the lower flammable limit throughout
the enclosure, and
The volatility of the fuel before the fire is sufficient to reach the lower flammable
limit in air (maximum ambient temperature or fuel temperature exceeds the closed
cup flash point temperature), or
The system cannot respond quickly enough to detect and extinguish the fire before
the volatility of the fuel is increased to a dangerous level because of the fire.
To Next Page
Loading...
Need help?
General
