FirePro units are selected based on the size and configuration of the risk to be protected. The size is determined by the cubic measurement of the space. This measurement is the internal dimensions of the space, in your calculation DO NOT DEDUCT the space occupied by things in the space (such as the engine or fuel cell). The configuration is the second consideration – the aerosol agent must be distributed within the risk.

The calculation must be made compartment by compartment. The compartment must be completely separate(including above the suspended ceiling and beneath the raised floor). The doors must, in the event of fire, be self-closing and if necessary be activated by the control system. Windows, (smoke/heat) hatches and/or ventilation systems must be and remain switched off and closed during the extinguishing. Leakage losses must have been considered and will, if necessary, form part of the calculation.

Leakage Allowances are specified in the design calculation module, these allowances are expressed in Square Meters and will need to be assessed in the final system design.

For the system design the calculation of the aerosol is a starting point, then the specific configuration of the risk, with final consideration stream length and clearances required.

Stream Length The distances shown under discharge length are those to be regarded as a maximum to obtain a rebound of discharge onto the surface (such as the floor) that then guarantees a good homogeneous spread of the aerosol in the protected compartment. Stream Length MUST be taken into account when designing a FirePro® System.

Safe clearance A safe distance has been laid down in respect of (flammable) materials and persons for each individual FirePro® unit in relation to the discharge of the aerosol. Its value is given in millimeters, as can be seen in the table.

Sample Design Calc

• For use on all applications in any risk type.
• Based on UL (Underwriters Laboratory) Approval
• Calculation based on Gross Volume of risk, NO DEDUCTIONS for items occupying the risk

AMSA (Australian Maritime Safety Authority) DESIGN CALCULATION
• For use ONLY on Marine Applications for vessels under survey upto 24m in length.
• Based on MCA (UK Coast Guard) Approval
• Separate calculations for Class A and Class B Risks
• Calculation based on Gross Volume of risk, NO DEDUCTIONS for items occupying the risk
MED (Marine Equipment Directive) DESIGN CALCULATION
• For use ONLY in Marine Applications
• Based on IMO (International Marine Organisation) Approval.
• Calculation allows deductions of space for NON Combustible items within the risk.
• The design calculations is based on different formulae.
• The IMO Approval covers:
– Passenger Ships, Cargo Ships, Tankers of unlimited gross tonnage,
– Off-Shore Oil Platforms and Other types of Vessels falling under IMO Jurisdiction.
• The approval covers protection of Machinery Spaces according to SOLAS 74 Chapter 2, regulation 32 & 34.
• These are spaces which contain either:

(a) Internal combustion machinery used for main propulsion
(b) Internal combustion machinery used for purposes other than main propulsion where such machinery has in the aggregate a total power output of not less than 375kW.
(c) Any of oil-fired boiler, or oil fuel unit, or any oil-fired equipment other than boilers, such as inert gas generators, incinerators, etc.
(d) Specifically, auxiliary equipment, boilers, condensers, evaporators, main engines, reduction gears, tanks, trunks

In addition to the above mandatory protection requirements it is up to the discretion of the owner to protect other areas of the vessel.

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