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:

Enhancing safety in battery energy storage systems
Technoswitch Fire Detection & Suppression Products & Solutions Fire & Safety
The calibration-free Combustible Gas & VOC Sensor by Technoswitch can be configured to detect various flammable gases, including electrolyte vapours (VOC) and hydrogen, and is an indispensable tool for ensuring the safety of Li-ion battery storage systems.

Read more...
ESPRIT intelligent fire panel range
Technoswitch Fire Detection & Suppression Products & Solutions Fire & Safety
Technoswitch recently added the EN54-approved ESPRIT intelligent control panel range to its product portfolio to complement the existing TC5000 intelligent control panel range, aimed at small and medium sites that require a cost-effective, networkable fire alarm system.

Read more...
Standards for fire detection
Fire & Safety
Nick Collins discusses standards for commissioning and handing over a fire project once the installation is complete.

Read more...
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...
Technology driving fire safety at Firexpo 2025
Securex South Africa News & Events Fire & Safety
As regulations change, safety and risk officers, and building managers are hard-pressed to keep pace with the exact requirements to ensure occupant safety and wellbeing. Firexpo’s role is to provide informed choices for the market.

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...