Over the past 150 years Sprinkler systems have been the most used and most important
type of fire fighting system in the world.
The primary purpose of the invention in a fire protection operation was to maintain the solidity
and integrity of the structure of the building to the point where people had the opportunity to evacuate,
and for firefighters Enough time to get to the scene.
Spinchloras did this very well, which is why the systems for nearly 150 years are the first fire protection option.
But unfortunately,due to the advances in technology and industry, Sprinklers have a weaker performance in preserving
the contents. Inside, they often help to destroy the property, especially when this property includes sensitive electronic equipment,
archival paper documents or other valuable artifacts ...
Finally, halons were introduced as an ideal plum ideal for solving this problem in the 60's. Halons were unmatched and did not leave
any residual waste, and for years they were grassy. However, Halon was also abandoned in the early 90's due to the potential for destruction
of the ozone layer, and its use was prohibited. Subsequently, various systems and gases were introduced in the years after the Hellon.
These systems were mainly known as Clean Agents, including gases such as HFC-227ea (known as the FM200TM brand), HFC-125, FK-5 12-12
(manufactured by 3MTM and supplied with the NovecTM 1230 brand) as well as various inert gases such as IG-55 (50/50 combinations
of argon and nitrogen gases), IG-541 ( Combined with 50/42/8 nitrogen, argon and CO2 gases, IG-100 (pure nitrogen) and IG-01 (pure argon).
While today Clean Cleaners or Clean Agents are used as desirable systems to protect sensitive environments such as server rooms, data centers,
Determining which gas is suitable for what it is used is almost a problem. Special chemical cleaners such as HFC-227ea, FK-5-1-12 and
HFC-125, mentioned above, all combine fire with the same shape. (Mainly by heat absorption) and all have relatively similar efficacy.
Inactive fired gases, by reducing the oxygen level below the level in which the combustion process does not occur, generally around 12%,
which all have the same effect in fire fighting. Given the relative equality among Clean agents, and among inactive casas when there is a
debate about fire fighting capability - Which agent is more suitable for its application? As expected, the answer to this question is practically
not straightforward. This response depends on many factors, and the relative importance of each of these factors for the final consumer should
also be taken into account. These factors include costs, environmental concerns, design flexibility, local approvals, and many other factors that
vary from purchase to buyer. The cost when cost is the most important and the first problem is, in many cases, a more affordable chemical
alternative system. Because inert gases act by lowering the oxygen level, they should contain a gas amount of 40% of the volume of space
Be protected.Inert gas cylinders are high pressure cylinders and are produced in limited sizes and volumes.
Therefore, an inactive gas system usually requires more cylinders than chemical exhaust systems such as the Fm-200. Chemical exhaust
systems are much less effective than inactive gases, and therefore have a much larger range of cylinder sizes and gas volume.
This makes the initial cost for an inert gas system in most cases There are many more chemical exhaust systems.
However, in the issue of degradation of the system, the cost of recharging the inert gas is very low compared to the chemical exhaust system.
Among the chemical systems, the HFC-125 system has a lower cost.
Due to its chemical properties, you need 10% HFC-125 less than the required HFC-227ea for a specific space.
This is less costly HFC-125 is more economical than other chemical systems. The next option in terms of cost justification is the HFC-227ea
system, or the FM-200. Again,the Novec-1230 is the most expensive chemical exhaust system. However, the cost is always a major factor
in choosing a cleaner system.
Halon environmental concerns have been eliminated about 30 years ago due to its negative effect on the ozone layer. Last year, fire alarm
systems have become increasingly worrisome due to the potential for global warming. CO2 was used as the reference point for measuring
the heating potential of the earth and was assigned a value of 1. The halocarbon agents used in fire suppression systems such as HFC-125
and HFC-227ea have a GWP of about 3, and FK-5-1-12 has one GWP. When environmental concerns are more important than cost,
Novec will be the best and most appealing chemical exhaust system.
Inactive gases such as nitrogen and argon do not have the potential to heat up the earth. And because they are extracted from
the atmosphere,they are very environmentally friendly, making the inactive gas the greenest firefighting option. The flexibility to design
inefficient gas systems,although often imposed more costly than chemical systems, offers the highest level of flexibility in design.
This is a function of two variables: 1. Inactive gases in overpressure cylinders Are stored at 4,000 psi, while chemical systems
are stored at pressures of 720-720 psi. 2. Inert gases are stored in gas, while chemical gases are stored in liquid form.
The higher pressure and single-phase flow of gas through the exhaust pipe network means that the inert gas has more energy
when discharged and fewer losses than chemical gases. When discharging a chemical agent, the liquid is released from the cylinder
Liquid flow causes more frictional losses than gas flow. In addition, the amount of energy passing through the liquid through the pipe decreases and
changes with the change of the liquid phase into the gas. All of these causes shorter pipes with a larger diameter For chemical systems.
Inactive gas is stored in gas and discharged into gas Therefore, it does not lose energy to change the phase of energy and leads to fewer losses.
This makes it possible for inactive gases to be able to make longer paths in smaller diameter tubes.
It also brings more flexibility to this system when it comes to the need to use a central cylinder bank to protect multiple locations.
The cylinder bank can be enclosed in a space away from the spaces and can even protect spaces over several floors in a multipurpose building.
These long distances have made inert gases a convenient option for protecting critical locations in industrial environments with just one cylinder bank.
تعداد بازدید: 67