Stop burning cash

November 2008 Fire & Safety

Saving money is in everyone’s best interest, particularly in a very competitive fire protection industry. The Fike ProInert Fire Extinguishing System design includes a distinct pressure regulating valve assembly different than standard inert gas systems on the market. This distinct design offers pipe and installation advantages resulting in overall system costs savings.

The Fike Inert Gas System is much more sophisticated than standard decaying pressure inert gas systems. The Fike system approach is to use a discharge valve that is designed to regulate the discharge pressure of the system to a constant 650 psi (44 bar) so the pipe pressure and nozzle flow rate(s) will be consistent for the duration of the discharge. Regulating the pressure at the valve outlet permits both low pressure rated piping to be installed in the entire system piping network. Smaller bore piping can also be used compared to standard inert gas systems. Both features present easier system installation and decreases the overall cost of the system installation.

According to a leading inert gas manufacturer, a systems peak flow rate occurs at 2 to 4 seconds into the discharge and is generally two to three times the average flow rate. As the pressure in the cylinder decays during the discharge, the orifice will continue to drop pressure in the same ratio, thus at approximately half the cylinder pressure the pipework pressure has dropped to 30 bar and the nozzle pressure to 10 bar. The use of orifice plates results in a very fast discharge rate initially and a very slow rate at the end of the discharge which at that point the extinguishing concentration is achieved.

NFPA and ISO standards require that 95% of the extinguishing concentration must be achieved within a 60-second time frame. This requirement is difficult to accomplish for orifice controlled inert gas systems without implementing other design measures. One method of achieving this regulatory requirement is to increase the quantity of stored extinguishant which increases the cost of the system and results in a higher concentration within the protected space which could potentially approach the NOEAL level of concentrations. Another industry known method to achieve this regulatory requirement is to implement a discharge time from 60 down to 45 seconds which results in higher discharge flow rates. Increasing a system flow rate results in a higher-pressure drop for a given size of pipe. To achieve a comparable pressure drop along the pipe the size needs to be larger in diameter.

For more information contact Mike Smiles, Masc Solutions, +27 (0)11 608 0065, [email protected]



Credit(s)




Share this article:
Share via emailShare via LinkedInPrint this page



Further reading:

Standards for fire detection
SAQCC (Fire) Fire & Safety Associations
In the second article from SAQCC, Nick Collins focuses on SANS 10139, which is generally regarded as the ‘Book of Knowledge’ for any fire detection installer, commissioner and designer.

Read more...
The unusual chemistry of lithium-ion battery fires
SafeQuip Fire & Safety
Traditional fire extinguishers, which use agents like water, foam, or dry chemicals, may not be suitable for lithium-ion battery fires due to the unique challenges posed by the high-energy density of these batteries.

Read more...
Saving lives with fire safety technology
Fire & Safety News & Events
The fire protection landscape is evolving swiftly, fuelled by technological advancements designed to improve safety and efficiency in fire detection, control, and suppression. These innovations transform traditional methods and establish new safety standards in residential and commercial spaces.

Read more...
Standards for fire detection
SAQCC (Fire) Fire & Safety
In the second article from SAQCC, Nick Collins focuses on SANS 10139, which is generally regarded as the “Book of Knowledge” for any fire detection installer, commissioner and designer.

Read more...
Rational design is not just a tick-box exercise
Fire & Safety
Rational design is about achieving performance-driven fire safety measures through sound engineering principles. It is not just a tick-box exercise, but involves a deep understanding of fire risks and behaviour, and developing customised fire protection strategies.

Read more...
Fire detection and gas suppression systems
Masc Solutions Products & Solutions Fire & Safety
Masc Solutions is an official Fike distributor and installer in South Africa, providing comprehensive design, supply, and installation services for specialised gas fire suppression systems.

Read more...
New fire blanket for lithium-ion battery fires
Fire & Safety Products & Solutions
SafeQuip launched its newly developed range of high-performance, multi-use lithium-ion battery fire blankets, specifically designed to address fires involving devices with lithium-ion batteries, providing a crucial tool for safety in environments where these batteries are in use.

Read more...
SafeQuip launches lithium-ion battery fire extinguishers
Fire & Safety Products & Solutions
[Sponsored] SafeQuip has launched the SANS 1910-2022 approved Lith-Ex fire extinguisher range, which carries NTA 8133:2021 (KIWA/POOO55865) test approval, which proves its lithium-ion battery fire extinguishing capability.

Read more...
Partnership addresses fire hazard mitigation
Brigit Fire (a Division of Hudaco Trading) Elvey Security Technologies Fire & Safety Security Services & Risk Management
Brigit Fire has partnered with the Elvey Group. The collaboration will see Brigit Fire distributing both the advanced C-TEC addressable fire detection systems (CAST Technology) and GreenMist lithium extinguishers.

Read more...
Fire alarm control panel with printer
Dahua Technology South Africa Products & Solutions Fire & Safety
Dahua’s fire alarm control panel with a printer is designed to provide early warning fire detection, display fire information and offer flexibility in design and operation to meet the demands of various projects.

Read more...