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NAFS125
Very similar characteristics to Halon 1301 but with Zero ODP makes this EPA approved gas the most effective replacement for current Halon installations. Ratio of propellant (nitrogen) to agent means that most halon systems will be able to retain the original pipe work.



(Check with us for system calculations)
NAF S 125 is identified as HFC 125 in the international standards. It is a clean agent particularly indicated for total flooding applications and requires the lowest concentration by weight among all the zero-ODP halo carbon agents.
Thanks to its physical characteristics, very similar to those of Halon 1301, NAF S 125 can be used also for the protection of low-temperature risks. With a boiling point of -48.5 C, NAF S 125, in fact, is quickly distributed inside the protected environment. Used in the military fighters of the US Air Force, it is considered by the US Federal Aviation Authority one of the best alternatives to Halon 1301 for cargo bays and engine nacelles of commercial airliners.
Thanks to its low acute toxicity, NAF S 125 can be used for the protection of normally occupied areas. The NAF S 125 maximum exposure times at different concentrations have been determined with the US EPA-approved PBPK model. In the NFPA 2001 Standard (Edition 2000), the maximum safe exposure of NAF S 125 has been set up at 11.5% for 5 minutes


PYROSHIELD GAS SUPPRESSIONS SYSTEM
PYROSHIELD is an inert gas blend of two gasses that are both naturally occurring elements in the air we breathe. These two gases have different molecular weights but when mixed have a similar molecular weight to normal air, greatly increasing the hold times.
Upon discharge, PYROSHIELD will reduce the oxygen level below the point at which combustion can take place whilst still being safe to personnel.
PYROSHIELD has zero ozone depletion potential (ODP), zero global warming potential and no secondary products of combustion. Additional benefits are that PYROSHIELD is a clear, odorless gas which produces no obscuration, has a low refill cost and cylinders can be stored remotely from the risk. This makes PYROSHIELD ideal for switch rooms, process industry, control rooms and hospitals.

ENCLOSURE REQUIREMENTS
The enclosure should be of fire resisting construction, able to withstand the ingress of fire from outside, and of sufficient strength to retain the agent. PYROSHIELD displaces air in the enclosure and it is necessary to provide venting, which allows excess pressure relief during discharge, normally at a fairly high level in the enclosure wall. The one-way vents close at the end of the discharge, enabling the concentration to be held. In the UK, room strength is generally taken as 500 Pascal, and, for internal stud walling, 250 Pascal is taken. The venting formula in our design calculation suggests the appropriate vent area.
Once the design concentration has been achieved, standards require that it be held for not less than ten minutes, or other agreed period. Although PYROSHIELD will leak more slowly from a given enclosure than the halo carbon agents, a room integrity pressure test is still required, and leakage paths sealed if necessary. The integrity test method is detailed in the British Standard, for Gaseous Fire Fighting Systems ISO 14520.
SYSTEM REQUIREMENTS
All systems are designed within the requirements of ISO 14520, or more closely defined requirements where found in appropriate national and international standards.
Each system is carefully tailored to the risk to be protected. A risk assessment is the starting point for the protection.Is an PYROSHIELD system the best way to protect the risk? If so, is the enclosure adequate to contain the gas, or can it be made to be adequate?What materials are likely to be involved in a fire, and which require the highest concentration for extinction?

What is the volume of the enclosure; is it connected to other volumes? What is the actual volume to be protected? What is the best type of detection to give early warning but minimum possibility of false alarms? Will people be present in the enclosure at a time when a fire could occur? Where is the best place to locate the system cylinders - with regard to system design, location to the fire, ease of maintenance?
Given the answers to these questions, a system can be designed, determining the quantity of gas required, the location of detectors, nozzles and distribution pipes, interlocks for doors, vents, air conditioning etc. Using well proven software, the sizes of pipes and nozzles can be readily determined, and the system designed in accordance with the appropriate standards.
SYSTEM MAINTENANCE
PYROSHIELD fire extinguishing systems are protecting life, facilities and sensitive equipment, and it is of paramount importance that they retain their capabilities 24 hours a day, 365 days a year. The high quality of the system components employed goes some way towards achieving this, our engineers fully maintain systems to specification, and also re-examine the risk and check the enclosure to ensure that, if changes have been made, the leakage rates will still be within the limits for effective fire control.

                                   
Suppresion System Control room                    Example of How a Suppresion system function
 


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Copyright 2005 Amco Technologies
Last modified: 08/02/11