4.2MPa external storage pressure FM200 gas fire suppression system
4.2MPa pressure design enables this clean agent fire suppression system to secure industrial zones. Trusted fm200 fire suppression system supplier for retrofits.
View productChoosing an inert gas fire suppression system comes down to four decisions: which agent, how much of it, how many cylinders, and whether the room will hold the concentration long enough to work. This guide takes them in that order, then shows where an IG100 gas fire suppression system is the natural answer — one industrial gas, no residue, no decomposition products — and where a high-pressure CO₂ unit is the better fit for the room you actually have.
Every inert gas fire suppression system is judged on the same four things — what the gas does to a fire, what it leaves behind, how it gets refilled, and what it does to the people who work in the room. The table puts IG-01, IG-55, IG-100 and IG-541 side by side, with FM-200 and CO₂ as reference columns.
| Decision | IG-01 | IG-55 | IG-100 | IG-541 | FM-200 (ref.) | CO₂ (ref.) |
|---|---|---|---|---|---|---|
| Agent makeup | Argon, single gas | Argon and nitrogen blend | Nitrogen, single gas | Nitrogen, argon and CO₂ blend | HFC-227ea | Liquefied carbon dioxide |
| Residue after discharge | None | None | None | None | No residue, but decomposition products can form on hot surfaces | None |
| Refill route | Industrial gas supply | Blended agent supply | Industrial gas supply | Blended agent supply | Specialty halocarbon supply | Liquid CO₂ supply |
| Occupancy safety | Lowers oxygen — occupied rooms need the full life-safety layer | Lowers oxygen — occupied rooms need the full life-safety layer | Lowers oxygen — occupied rooms need the full life-safety layer | Lowers oxygen — occupied rooms need the full life-safety layer | Specified for occupied spaces within design limits | Toxic to humans — unmanned areas, or safety measures where occupied |
| Cylinder footprint | Largest of the family | Large | Large — more cylinders per protected volume than a halocarbon agent | Large | Smallest of the group | Compact for the agent mass carried |
| Where it fits best | Argon already handled on site | Projects wanting a second supply route for the blend | Single gas with the simplest refill chain, and large electrical rooms | Projects that want CO₂ included in the agent mix | Tight plant rooms where footprint dominates the layout | Unmanned plant and process rooms, plus local application onto a machine |
| Stored pressure | High-pressure cylinder; count and pressure set by the room calculation | High-pressure cylinder; count and pressure set by the room calculation | High-pressure cylinder; count and pressure set by the room calculation | High-pressure cylinder; count and pressure set by the room calculation | 4.2 MPa variants listed in the catalogue | 5.7 MPa at 20 °C; 12.4 MPa maximum at 50 °C |
Cylinder count, storage pressure and manifold layout for an IG-100 system are fixed by the enclosure calculation and confirmed on the approved submittal, not by a catalogue line. The datasheet published in full on this page covers the 70 L 5.7 MPa CO₂ unit.
Pure argon. One gas to handle and the largest cylinder count per protected volume in the family.
Argon–nitrogen blend. Two gases to source, and a refill you can only take from a blended supply.
Pure nitrogen. One industrial gas for design and refill, and the simplest supply chain of the four.
Nitrogen, argon and CO₂ blend. Adds CO₂ to the mix, which tightens both the supply and the refill route.
IG-100 is nitrogen and nothing else. That single fact drives most of what makes it straightforward to specify. The agent is non-conductive, so a discharge onto a live switchboard does not create a second fault. It leaves no residue, so servers, busbars and terminal blocks do not have to be wiped down or replaced before the room can be re-energised. And because the gas is inert, it does not break down on a hot surface into acidic by-products the way halocarbon agents can — the difference between a room that needs ventilation and a room that needs a replacement programme.
The supply chain matters as much as the fire performance. Nitrogen is an industrial gas with multiple suppliers in most regions, and a refill does not depend on a proprietary blend. After a discharge, or after a cylinder has been taken out of service for periodic inspection, the bank can be returned to design concentration without waiting on a blended-agent shipment. That is a maintenance question rather than a fire question, and it is the one that tends to decide the specification three years after handover.
What IG-100 does not do is protect people on its own. Any inert agent works partly by lowering the oxygen available to the fire, which means it also lowers the oxygen available to anyone still in the room. Occupied spaces therefore need the full life-safety layer: pre-discharge warning, a time delay long enough to leave, a manual abort on the exit route, signage at every door and a controlled re-entry procedure. Those are design decisions, not accessories bolted on at the end.
A cylinder count is an output, never an input. These are the eight things that produce it — each one changes the answer, and each one arrives on a document you probably already have.
Agent quantity is calculated on the air volume actually being protected. Columns, ducts, cable trays and standing equipment remove volume; a raised floor or a suspended ceiling can add it.
Supplied by: architectural plan plus a section drawing.Permanent openings let agent escape during the hold period. Each one is either closed on discharge or compensated for in the calculation — there is no third option.
Supplied by: door and damper schedule.The room must hold its concentration for the required hold time. A leaky room renews the fire with fresh oxygen while the agent drains away.
Supplied by: a door-fan test report, or a commitment to test before handover.Temperature drives the pressure inside the cylinder, and the equipment has a working range as well. The published datasheet for the 70 L CO₂ unit runs from 0 °C to +50 °C.
Supplied by: HVAC design conditions, summer and winter.This decides whether the design needs a full life-safety layer, and whether a CO₂ system can be considered for the space at all.
Supplied by: occupancy schedule and normal manning levels.The class of fire in the room sets the design concentration, and the design concentration sets everything downstream of it.
Supplied by: a hazard description — what burns, how it is stored, how it is powered.A void is either protected separately or folded into the room volume. Get it wrong and one of the two spaces ends up under-protected.
Supplied by: reflected ceiling plan and section.Inert agents need a real plant space for cylinders and manifold. If there is nowhere to stand the bank, the design changes before the calculation does.
Supplied by: GA drawing with the available plant area marked. See how the cylinder assembly is built →The sequence is fixed even though the numbers are not. Each step depends on the one before it, which is why a wrong figure at step one is still a wrong figure at step six.
Design concentration is a property of the hazard, not of the brand on the cylinder. It comes from the applicable standard for the class of risk in the room, and it is the single number the whole calculation hangs on.
Before the agent quantity is calculated, look at the atmosphere the room will be left with. This is the step that decides whether an inert agent is even permissible for a space people use.
At a 35% design concentration the room settles near 13.6% oxygen — well below the 19.5% floor normally applied to occupied spaces. That comparison, not the fire performance, is what drives the life-safety design.
Agent mass is a function of the protected volume, the design concentration and the specific volume of the gas being used. Every input from the previous module feeds this one line — this is where a wrong net volume becomes a wrong cylinder count.
Divide the agent requirement by the fill capacity of the cylinder you are using, round up, then check the result against the plant space you have. This is the number that surprises people: inert agents need more cylinders than halocarbon agents for the same room.
One room can run from a manifold and a single pipe route. Several rooms need selector valves so a single bank serves whichever room is on fire. Nozzle count and spacing follow the room geometry, not the cylinder count.
Long runs, tight bends and undersized pipe all cost pressure at the nozzle. The layout the calculation assumes has to be the layout that gets installed — and this is where the drawing and the site usually disagree first.
A cylinder bank that discharges into a leaking room is an expensive way to make noise. These six items decide whether the concentration ever reaches the fire.
Verified by a door-fan test at handover, and re-verified after any building works that punch a hole in the envelope.
A room that cannot vent will not hold its door closed through a discharge. Relief is sized to the discharge, not picked off a shelf.
Audible and visual, and distinctive enough that it is not mistaken for the general fire alarm everyone already ignores.
Enough delay to clear the room, and a manual abort placed on the exit route rather than behind a locked panel.
A warning at every entrance, and a written procedure for re-entry once the system has operated.
The room is not breathable until it has been ventilated and the atmosphere measured. Plan the route before the event, not after.
IG-100 cylinder count, storage pressure and manifold layout are confirmed per room on the approved submittal. The unit with a complete published datasheet is the 70 L high-pressure CO₂ assembly — useful because it shows exactly how storage, actuation and discharge are specified on a high-pressure gas system.
| Container capacity / agent quantity | 70 L / 42 kg |
|---|---|
| Storage pressure at 20 °C | 5.7 MPa |
| Maximum operating pressure at 50 °C | 12.4 MPa |
| Discharge time | 60 seconds or less |
| Electromagnetic start | DC 24 V, 1.5 A or less |
| Mechanical emergency start | Included |
| Manual start | Included |
| Operating temperature range | 0 °C to +50 °C |
| Discharge modes | Total flooding of an enclosure, or local application onto a specific hazard |
| System integration | Modular design, built to work with existing fire detection and alarm systems |
Redundancy in a suppression system is not about the gas — it is about the signal. The documented unit carries an electromagnetic start driven from the control panel at DC 24 V and no more than 1.5 A, a mechanical emergency start for the case where control power is gone, and a manual start at the cylinder itself. Discharge completes in 60 seconds or less once either route operates.
The buyer decision: ask for the actuation matrix in the submittal. It should state which method operates on loss of power, which operates on loss of detection, and who is authorised to use the manual release.
The same cylinder hardware lands in very different rooms. What changes from one to the next is the occupancy question and the enclosure question, in that order.
The documented system is described for enclosed or unmanned spaces, and for total flooding of a room or local application onto a specific hazard. It is listed for data centres, control rooms, electrical equipment enclosures, archives, industrial equipment rooms, warehouses, manufacturing plants and critical infrastructure. That list is broad on purpose: the room type sets the hazard class and the occupancy pattern, and those two set the design.
Rapid suppression, no residue, and no clean-up before power is restored to the racks. The datasheet positions the system for spaces where contamination from other agents is unacceptable.
Decision to make: is the hall staffed during working hours? If yes, the life-safety layer is mandatory and an inert agent is the only viable route.Live electrical equipment means the agent has to be non-conductive and has to leave nothing behind on terminals. Total flooding of the enclosure is the normal arrangement.
Decision to make: will the enclosure hold pressure, and is there a wall available for relief venting?Paper brings deep-seated smouldering risk and contents that cannot be replaced. The system protects the material, so the residue question matters as much as the speed.
Decision to make: what hold time is the room actually built to, and can it be proven on paper?The documented system supports either total flooding of the enclosure or local application onto a specific machine within a larger space.
Decision to make: one hazard or many? More than one protected room means selector valves and a larger manifold.Find the row that matches the room you are working on. The middle column is the part of the design that moves; the right-hand column is what shortens the conversation.
| Scenario | What it changes | What to send |
|---|---|---|
| Staffed control room with daily occupancy | The life-safety layer becomes mandatory, and the design concentration is capped by what the room can safely be left at | Occupancy schedule plus the egress plan |
| Unmanned process or plant room | CO₂ total flooding or local application becomes viable, and the agent comparison narrows quickly | GA drawing plus the equipment layout |
| Records store with a specified hold time | Enclosure integrity, not the gas, drives the agent quantity and the cylinder count | The hold-time requirement, or an existing door-fan report |
| Retrofit with raised floor and suspended ceiling | Void treatment changes the net protected volume and the nozzle layout | A section drawing through both voids |
| Multi-room suite on one cylinder bank | Selector valves, pipe routes and pressure drop all enter the design at once | Floor plan with every protected room marked |
A sizing review is faster than a price list. Give us the room and the constraints, and the reply comes back as a design basis: agent, concentration, cylinder count, manifold and nozzle layout — configured for your project as a custom-engineered solution rather than pulled from a shelf.
GA and section drawings, plus the room schedule.
We close out the eight inputs — volume, openings, integrity, temperature, occupancy.
Agent quantity, cylinder count and layout, with the assumptions written down.
Cylinder bank, valves, nozzles and delivery, quoted as one package.
Keep adjacent product options together for a faster catalog comparison.
4.2MPa pressure design enables this clean agent fire suppression system to secure industrial zones. Trusted fm200 fire suppression system supplier for retrofits.
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