NMX‑AAB‑30 / Rev 00 / high-altitude safety / inflate · qualify · recharge 2026 · Product Page

NMX-AAB-30 · ENGINEERED TO ORDER — AVALANCHE AIRBAG SYSTEMS

It does not make you float. It makes you a bigger particle.

Name: Avalanche Airbag System
Brand: Neometrix

The instinct is that the bag lifts you, the way a lifejacket does. It does not. Moving debris behaves as a granular flow, and in an agitated granular flow large objects migrate upward while small ones settle between them — so the bag works by making the wearer a larger particle, separating toward the surface rather than sinking through it. Which is why volume matters more than lift, and why the bag has to be full early and stay full for the whole ride. Everything hard about the system follows from one requirement: it must work once, cold, after a season of not working — about two seconds, one-handed, in thick gloves, by someone already being knocked off their feet. Cartridge pressure falls with temperature, so the energy available falls with it. The class is offered as an engineered-to-order capability; no delivered avalanche airbag system is claimed.

Enquire — avalanche airbag Capability sheet (PDF)

Illustrative of the class — an avalanche airbag pack system laid out flat on a brushed steel workbench, seen from directly above: a matte charcoal-grey technical fabric rucksack lying face down with plain unmarked webbing shoulder straps and waist belt spread flat, a folded olive-green inflatable bladder of light coated fabric beside it, a short bare aluminium gas cylinder with a machined stainless valve head, and a small moulded charcoal deployment handle on a short grey cord, no people, nothing inflated and no readable markings

Fig · 01 The system, laid out — and the small aluminium cylinder is the part that decides whether any of it works

Works by

being biggernot by floating

Must deploy

cold, oncein about 2 seconds

Limit

cartridge energyat temperature

Sustained by

the refill chainor it is luggage

Status

engineered to ordercapability offered

ISO 9001 / 14001 Engineered to order High-pressure gas systems Charging & certification Noida · India

Overview

The bag is the easy part. The cold is not.

A bladder is a bought-in item made by people who make bladders. What decides whether a fleet of these actually works is the gas behind it, the pull that releases it, and whether anyone can recharge it afterwards.

Illustrative of the class — close view across a brushed steel workbench of a short bare aluminium high-pressure gas cylinder lying horizontally with a precisely machined stainless steel valve head screwed into its neck, a knurled collar and a small bright hexagonal fitting, a separate machined stainless aspirator body with a wide flared throat standing upright beside it, and a coiled grey activation cable with a plain charcoal moulded handle alongside, no people, nothing connected and no readable markings

Fig · 02 Cartridge, valve and aspirator — the flared throat is where most of the air actually comes from

Separation, not flotation. The mechanism is worth being precise about, because it dictates the specification. Debris in motion is not a fluid; it is a mass of particles being shaken, and shaken particle mixtures sort themselves — the large rise, the small percolate down into the gaps. A wearer with a large bag inflated becomes, in that sorting, a big particle. It follows that the useful quantity is volume, not buoyancy; that the bag must be at full volume early, because separation takes the whole ride and a bag still filling is not yet doing anything; and that it must stay inflated, because a bag that deflates on the way down surrenders the size it was there to provide.

Most of the air is not from the cartridge. A cylinder small enough to carry cannot hold the volume the bag needs. So the cartridge gas is used as a jet through an aspirator, and that jet drags in a far larger quantity of ambient air behind it. This is elegant, and it has a sting: entrainment depends on the strength of the jet. A cartridge that has lost pressure — because it is cold, or was filled imprecisely, or has crept down over a season — does not simply fill the bag more slowly. It entrains less air as well, so the deficit compounds, and the bag can end up meaningfully short of volume at exactly the moment volume is the whole point.

And it has to survive being ignored. This equipment spends almost all of its life not being used: carried, dropped, crushed under other kit, cold-soaked for weeks. Then it is asked to perform once, immediately, under the worst conditions it will ever see. That is a different design problem from a machine that runs daily — there is no warm-up, no check-run, and no second attempt. It is also why the honest test is not a demonstration but repeated deployment after cold soak.

The class is offered as an engineered-to-order capability. No delivered avalanche airbag system is claimed — and the scope below states plainly which parts of the system Neometrix engineers and which are bought in certified.

Volume

Full, early, and staying full

Sized on effective size in a granular flow — not on lift.

Cold

Qualified where it is used

Repeated deployment after cold soak — a warm bench proves nothing.

Recharged

A refill chain, not a spare

Pressure, moisture and certification — or the pack is luggage.

Architecture

Pull it cold, fill it fast, then recharge it again.

The schematic follows the event first — two seconds, a jet, a full bag, a whole ride — then the four blocks behind it: inflation, trigger, charging and certification, and integration with qualification.

FIG · 03AVALANCHE AIRBAG ARCHITECTURE · INFLATION / TRIGGER + ACTUATION / CYLINDER CHARGING + CERTIFICATION / INTEGRATION + QUALIFICATION

Fig · 03 Qualified at the temperature of use, and sustained by the chain that recharges it

Arc · 01

Inflation System

Cartridge interface, valve, aspirator, fill path — where the jet entrains the ambient air that does most of the filling.

Arc · 02

Trigger & Actuation

Handle, routing, arming and safing — findable and pullable with a gloved hand, and proof against firing in a kit truck.

Arc · 03

Charging & Certification

Pressure and moisture specification — with inspection, requalification and the fleet refill chain behind it.

Arc · 04

Integration & Qualification

Load carriage, cold soak, repeated deployment — and the packing discipline that keeps a repacked bag deployable.

Specifying a fleet for sustained sub-zero service? Send the temperature range, the carry configuration, the fleet size and where recharging would have to happen — a clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Specified against the cold, not against a catalogue.

The parameters below describe the engineering approach. Bag volume, cartridge charge, aspirator sizing, trigger force and the charging chain all follow from four givens: the temperature range of service, the carry configuration, the user population, and where in the world a cylinder can realistically be recharged.

Illustrative of the class — a cylinder charging and certification bench in a clean workshop: a light-grey painted steel bench frame carrying a compact stainless high-pressure charging manifold with machined valves and cone-and-thread fittings, two blank unmarked pressure gauge bodies with faces turned away, a short stainless flexible charging hose, a row of six identical bare aluminium gas cylinders standing upright in a plain grey cylinder rack, and a light-grey control cabinet with completely blank panels behind, no people, nothing running and no readable markings

Fig · 04 The charging bench — the least glamorous part of the system, and the part that keeps a fleet alive

Where these systems go wrong

Qualified warm, used cold — the demonstration passes in a workshop and the equipment meets its real temperature for the first time in service. Cartridge charge specified at fill temperature rather than at the temperature of use, so the pack leaves the store correct and arrives at altitude under-energised. A trigger that needs two hands or bare fingers — unusable in precisely the two seconds it exists for, and usually discovered only in training. Moisture in the charged gas — harmless in the cylinder, and then it freezes where the gas expands and blocks the orifice. No refill chain — one deployment, or one training pull, and the pack is inert for the rest of the season. And load-carriage integration done last, so the pack that was qualified on its own now has the handle buried under a strap or the inflation path fouled by the load.

So the discipline runs the other way. The service temperature is the first input, and the cartridge is charged so that the energy is right at the cold end of the range rather than the warm end. Gas is specified for moisture as strictly as for pressure. The trigger is specified against the user — gloved, one-handed, under load, with deliberate arming and safing so a pack can be transported without firing. Qualification is repeated deployment after cold soak, with the pack in its carry configuration rather than on a bench. And the refill chain is designed as part of the system — charging, gas quality, inspection and requalification, sited where the fleet actually is.

Full specification — expand

System	Avalanche airbag system — inflation, trigger & actuation, cylinder charging & certification, integration & qualification
Governing Idea	Separation, not flotation — debris moves as a granular flow in which large objects rise and small ones settle, so the bag works by making the wearer a larger particle
What Follows	Volume matters more than lift; the bag must be at full volume early and stay inflated for the whole ride, because separation takes the whole ride
Designed Against	Critical burial — the head beneath the surface — rather than impact, because the chance of survival falls steeply with time spent buried
Where The Air Comes From	Mostly entrained ambient air, dragged in by the cartridge jet through an aspirator — so a weak cartridge fills slower and entrains less, and the shortfall compounds
The Cold Case	Cartridge pressure falls with temperature, so charge is specified for the cold end of the service range; seals stiffen, lubricants thicken, and a trigger cable can ice
Trigger	Findable and pullable one-handed with a gloved hand, under load, in about two seconds — with deliberate arming and safing so a pack does not fire in transport
Gas Quality	Filled to a controlled pressure and a controlled moisture specification — water freezes where the gas expands, and a blocked orifice is a bag that does not inflate
Qualification	Repeated deployment after cold soak, in carry configuration — not a bench demonstration at room temperature
Through Life	Inspection, requalification, packing and repacking discipline, and a refill chain at or near the point of use — a deployed pack is dead weight until recharged
The Split	The helium charging station is the same filling-to-specification problem at another scale — pressure, gas quality and certification. The hypobaric altitude chamber is where altitude and cold qualification is actually performed rather than asserted. And the portable nitrogen trolley with booster is the kind of portable high-pressure gas supply a refill chain in remote country is built from
Scope Boundary	Ours: the inflation system, cylinder charging, gas quality & certification, the deployment trigger and its reliability at temperature, cold-soak & deployment qualification, load-carriage integration, fleet refill and through-life support — including build to the customer's specification. Bought-in certified: the bladder and its textile, the certified gas cartridge, the pack fabric and harness hardware. The customer's: the requirement, the user population and the terrain
Status	Engineered to order — the class is offered as an engineered-to-order capability; no delivered avalanche airbag system is claimed

PDF · 1 page

Avalanche Airbag System — Capability Sheet

Tender Response

Send temperature range, carry configuration & fleet size — compliance matrix in two working days

Variants

One mechanism, four configurations.

What changes is how often it has to fire, how cold it has to stay working, and who recharges it afterwards.

Var · 01

Single-Deployment Cartridge System

The operational configuration — one charge carried, one pull, and a defined route back to a recharge point.

Var · 02

Trainer Configuration

Built to be fired repeatedly — because the pull has to be practised, and practice must not consume operational stock.

Var · 03

Cold-Service Variant

For sustained sub-zero carriage — charge, seals and lubricants chosen at the cold end rather than the average.

Var · 04

Fleet Charging & Certification Station

The half that keeps the rest alive — filling to spec, gas quality, inspection and requalification, sited near the fleet.

Applications

Wherever people work above and below the snow line.

The users for whom burial time is the whole risk.

A · 01High-altitude military operations

A · 02Mountain rescue teams

A · 03Avalanche control & patrol

A · 04Glaciological & survey parties

A · 05Remote infrastructure crews

A · 06Training establishments

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 If it isn’t buoyancy, how does the bag actually help?

By changing the wearer's size, not their density. Moving avalanche debris is not a liquid and does not exert buoyancy in the way water does; it is a mass of solid particles being violently agitated. Agitated mixtures of different-sized particles do something well known and slightly counter-intuitive: they sort by size, with larger items working their way upward while smaller ones filter down through the gaps between them. Anyone who has watched the big nuts collect at the top of a tin has seen it. An inflated airbag makes the wearer, in that sorting process, one of the large items — so they tend to be carried toward the surface rather than percolating down into the flow. Three practical consequences follow, and they drive the whole specification. First, the useful quantity is volume: a bigger bag is a bigger particle, whereas making it lighter achieves comparatively little. Second, the bag must be at full volume early, because the sorting happens throughout the descent and a bag still inflating is not yet contributing. Third, it must stay inflated for the whole ride, because deflating partway surrenders exactly the property it was carried for. It is also why the honest measure of success is reduced critical burial — staying where the head is not under the surface — rather than any claim about surviving the forces involved.

Q · 02 Why does cold matter so much more than for other equipment?

Because the stored energy itself shrinks, and everything downstream of it shrinks with it. The pressure of a fixed quantity of gas in a fixed volume falls as the temperature falls — so a cartridge charged correctly in a warm store is, by the time it has been carried for a week at altitude in winter, holding materially less pressure than it left with. Nothing has leaked and nothing is faulty; the energy available to inflate the bag is simply lower. That alone would be manageable if it were the only effect, but it is not. Elastomeric seals stiffen as they get colder and need more force to move; lubricants thicken; a trigger cable can ice where moisture has found its way into the housing. And then the compounding problem discussed above: because most of the bag's volume is ambient air entrained by the cartridge jet, a weaker jet drags in less air, so a modest loss of cartridge pressure produces a more-than-modest loss of inflated volume. The practical answer is to design at the cold end rather than the average. The charge is specified so the system performs at the coldest service temperature, not at workshop temperature; materials are selected for low-temperature behaviour rather than nominal ratings; and the equipment is qualified by repeated deployment after genuine cold soak, in its carry configuration. A demonstration at room temperature tells you almost nothing about the condition it exists for.

Q · 03 Why is moisture in the gas treated as a safety item?

Because of where the gas gets cold. Water vapour carried into a cylinder during filling is entirely harmless while it sits there under pressure. The problem arrives at the instant of use: when the cartridge discharges, the gas expands rapidly, and rapid expansion cools it sharply — substantially below the ambient temperature, which in this application is already well below freezing. Any moisture present will condense and freeze precisely at the narrow passages where the gas is expanding fastest, which is to say at the valve seat and the orifice. A partially blocked orifice throttles the jet; a fully blocked one stops it. Either way the bag does not reach volume, and the failure occurs during the one event the equipment exists for, with no opportunity to diagnose or retry. This is why filling is specified for moisture content as strictly as for pressure, why the filling equipment needs drying and the supply needs to be clean and dry, and why cylinders that have been opened, serviced or left with a valve loose need proper purging before being returned to service. It is unglamorous work — and it is the single most preventable cause of a system that passed every visible inspection and then did nothing when it was pulled.

Q · 04 What makes the trigger a hard design problem?

It has to satisfy two requirements that pull in opposite directions. It must be certain to fire when a person who is already falling, disoriented, wearing thick gloves and possibly holding something else reaches for it — one-handed, without looking, within about two seconds. And it must be certain not to fire when a pack is thrown into a vehicle, stacked under other equipment, dragged through a doorway or carried on a crowded truck for a week. Make the pull light enough to guarantee the first and you risk the second; make it heavy enough to prevent the second and a gloved hand in the wrong position may not achieve it. The resolution is not a compromise on pull force but a deliberate arming and safing arrangement, so the system is positively inert when stowed and positively live when carried, with the state obvious to the user by feel rather than by reading anything. Beyond that, the design is dominated by human factors rather than mechanics: where the handle sits relative to the shoulder strap so it can be found without searching; how it is routed so a load or an over-strap cannot bury it; whether it can be operated with either hand, since which arm is free is not something anyone gets to choose; and whether a repacked pack reliably ends up with the handle where the drill says it will be. Most of that is settled by trials with the actual user population in the actual clothing — not by calculation.

Q · 05 Why does the refill chain get so much attention here?

Because a deployed pack is inert, and inert packs accumulate. Every real deployment consumes a charge; so does every training pull, and training pulls are essential because a system nobody has practised with is one nobody will operate correctly under stress. If recharging requires sending cylinders to a distant facility, the practical effect on a remote fleet is that packs quietly stop being serviceable one at a time, and the unit's real coverage falls well below its inventory figure — usually without anyone tracking it. So the recharging capability is treated as part of the system rather than as an afterthought: filling equipment specified for pressure and moisture, sited at or near where the fleet actually operates; the gas supply that feeds it, which in remote cold country is its own logistics question; the inspection and requalification intervals that a pressure vessel carries by law wherever it is used; and the records that let someone say with confidence which packs are live. This is also the part of the system that sits most naturally with what Neometrix already does — high-pressure gas, charging stations, cylinder handling, gas quality and certification are the company's existing ground, and they are what turn a box of bought-in packs into a fleet that stays serviceable through a season.

Q · 06 What do you build, what is bought in — and what is claimed?

Divided honestly, and this division matters more on this page than on most. What Neometrix provides: the inflation system — cartridge interface, valve, aspirator and fill path, sized so the bag reaches full volume early at the cold end of the service range; the deployment trigger and its actuation, including arming and safing, handle placement and routing, and the behaviour of the whole chain at temperature; cylinder charging, gas quality and certification — filling to pressure and moisture specification, inspection, requalification and the fleet refill chain; cold-soak and repeated-deployment qualification in carry configuration; integration with the load carriage, so the handle stays findable and the inflation path stays clear; and documentation, training, spares and through-life support, including build to the customer's own specification. What is bought-in certified: the bladder and its textile, the certified gas cartridge, and the pack fabric and harness hardware — these are the products of established specialist makers, integrated rather than imitated, and this page does not claim to design them. What is the customer's: the requirement, the user population and the terrain it deploys in. And the record, stated plainly: the class is offered as an engineered-to-order capability, and no delivered avalanche airbag system is claimed.

↗

The gas and qualification side from Neometrix.

Filling to specification, proving it at altitude, and supplying it in remote country.

↗ Charge

Helium Charging Station

The same filling-to-specification problem — pressure, gas quality, certification.

↗ Qualify

Hypobaric Altitude Chamber

Where altitude and cold qualification is performed rather than asserted.

↗ Supply

Portable Nitrogen Trolley & Booster

The portable high-pressure supply a remote refill chain is built from.

Browse all Neometrix product lines.

Get a quotation

Send the temperature range
and where it gets recharged.

The projects desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — avalanche airbag Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — AVALANCHE AIRBAG SYSTEMS SEPARATION NOT FLOTATION · QUALIFIED COLD · SUSTAINED BY THE REFILL CHAIN ENGINEERED IN NOIDA · INDIA

It does not make you float. It makes you a bigger particle.

The bag is the easy part. The cold is not.

Full, early, and staying full

Qualified where it is used

A refill chain, not a spare

Pull it cold, fill it fast, then recharge it again.

Inflation System

Trigger & Actuation

Charging & Certification

Integration & Qualification

Specified against the cold, not against a catalogue.

Where these systems go wrong

One mechanism, four configurations.

Single-Deployment Cartridge System

Trainer Configuration

Cold-Service Variant

Fleet Charging & Certification Station

Wherever people work above and below the snow line.

Common questions.

The gas and qualification side from Neometrix.

Helium Charging Station

Hypobaric Altitude Chamber

Portable Nitrogen Trolley & Booster

Send the temperature range
and where it gets recharged.

Similar Products

Share This Page

It does not make you float. It makes you a bigger particle.

The bag is the easy part. The cold is not.

Full, early, and staying full

Qualified where it is used

A refill chain, not a spare

Pull it cold, fill it fast, then recharge it again.

Inflation System

Trigger & Actuation

Charging & Certification

Integration & Qualification

Specified against the cold, not against a catalogue.

Where these systems go wrong

One mechanism, four configurations.

Single-Deployment Cartridge System

Trainer Configuration

Cold-Service Variant

Fleet Charging & Certification Station

Wherever people work above and below the snow line.

Common questions.

The gas and qualification side from Neometrix.

Helium Charging Station

Hypobaric Altitude Chamber

Portable Nitrogen Trolley & Booster

Send the temperature rangeand where it gets recharged.

Similar Products

Share This Page

Send the temperature range
and where it gets recharged.