NMX‑HDS‑300 / Rev 00 / PVHO‑1 · DNV / IRS · IMCA / Noida · India 2026 · Product Page

NMX-HDS-300 · ENGINEERED TO ORDER — HYPERBARIC & DIVING LIFE-SUPPORT SYSTEMS

Keeping people alive at pressures the sea would not.

Name: Hyperbaric & Saturation Diving Systems
Brand: Neometrix

Hyperbaric and saturation diving systems — the man-rated pressure vessels and gas and life-support engineering behind deep diving and its treatment. Recompression chambers, saturation living chambers and wet pots to the 30 ATA (~290 msw) class, with heliox gas management and helium reclaim to IMCA, built to ASME PVHO-1 and classed by DNV or IRS. Engineered to order — no delivered system is claimed on this page.

Enquire — diving systems Capability sheet (PDF)

Illustrative image, not a delivered installation — a multi-compartment steel hyperbaric chamber complex in a hall: a horizontal cylindrical pressure vessel with two interconnected compartments, several round view ports, a small circular medical lock door, external pipework and valves running to a life-support panel, mounted on a steel cradle

Fig · 01 A multi-lock hyperbaric chamber — a pressure vessel built to hold people, not gas — illustrative, not a delivered installation

Depth class

30ATA · ~290 msw

Occupancy

Multi‑manliving & treatment

Breathing gas

Heliox+ He reclaim

Built to

PVHO‑1man-rated

Classed

DNV / IRSIMCA reclaim

ISO 9001 / 14001 Engineered to order ASME PVHO-1 man-rated Classification & sea trials in scope Noida · India

Overview

Decompress once. That is the whole idea.

A diver going deep faces a cruel arithmetic: the longer the bottom time, the longer the decompression to come back safely — until the decompression dwarfs the work. Saturation diving breaks that curve. Past a point the body’s tissues are fully saturated with inert gas and take on no more, so the decompression stops growing. Pressurise the divers once, let them live at depth for days, and decompress them a single time at the end. It is the reason deep naval and offshore work is possible at all — and it turns diving into a life-support engineering problem.

Illustrative image, not a delivered installation — a diving gas and life-support spread: banks of high-pressure gas cylinder quads on a steel frame, a high-pressure gas booster unit, and a stainless gas-blending panel with regulators, gauges and valves feeding stainless tubing toward a chamber

Fig · 02 The gas spread — quads, booster and heliox blending — illustrative, not a delivered installation

The gas is not air. Under pressure nitrogen turns narcotic and heavy to breathe, so divers breathe heliox — helium and oxygen. Helium is expensive and finite, which is why the wet diving chamber recovers what the divers exhale through a helium reclaim unit to IMCA standards, and why the gas spread — cylinder quads, boosters, blending panels — is as much of the system as the chambers themselves.

Life support runs on a knife-edge. Oxygen has to be made up within a narrow window — too little and the diver goes hypoxic, too much and it turns toxic; carbon dioxide has to be scrubbed continuously; and because helium conducts heat about six times faster than air, divers chill quickly, so temperature and humidity are held close. All of it is monitored around the clock, with built-in breathing systems for therapy and emergency mixes.

A diving chamber is a pressure vessel with a heartbeat. It is certified not for the gas it holds, but for the people inside it.

Engineered to Order

Quoted against naval & forces diving needs

This capability has been quoted against Indian naval and armed-forces diving requirements — recompression chambers, experimental hyperbaric complexes to the 30 ATA class, and diving spreads. No delivered system is claimed; chamber count, depth rating and the spread are settled at design review.

Man-Rated, Not Gas-Rated

PVHO-1, classed by DNV or IRS

A pressure vessel for human occupancy is a different discipline from an air receiver: ASME PVHO-1 construction, acrylic view ports to their own code, medical locks and transfer-under-pressure locks, appraised by DNV, IRS or LRS and containerised to DNV 2-7-1 where portable.

The Gas Heart Is Ours

High-pressure gas is our home ground

The system’s gas engineering — high-pressure boosting, blending, storage and reclaim — is exactly the high-pressure gas competence Neometrix already builds for compression, cascade and charging systems. The diving system is that competence turned to keeping divers alive.

Architecture

Surface to seabed, and back once.

The schematic below follows the saturation spread — gas, console, living chambers, wet pot and bell — and the detail panel shows the life-support loop that keeps the occupants breathing through all of it.

FIG · 03SYSTEM ARCHITECTURE · GAS SPREAD · LIFE-SUPPORT · LIVING CHAMBERS · WET POT · BELL

Fig · 03 Divers transfer under pressure from chamber to bell to worksite and never return to surface pressure until the single decompression at the end

Arc · 01

The Gas Spread

High-pressure cylinder quads, gas boosters and a heliox blending panel make and store the breathing mixes. This is where the depth is really set: the mix is leaned or enriched with depth so the partial pressure of oxygen stays in its safe band while the helium does the breathing work nitrogen cannot.

Arc · 02

Living Chambers & Locks

Primary and secondary living compartments, each separately controlled, linked by transfer-under-pressure locks so occupants move between them without decompressing, and served by a medical lock — a small pressure lock through which food, medicine and tools pass in and out while the people stay at depth.

Arc · 03

Wet Pot & Helium Reclaim

The wet diving chamber — a flooded pot at chamber pressure — is where divers train and work in water at depth. Its breathing gas carries a helium reclaim unit to IMCA: exhaled helium is captured, cleaned and returned rather than vented, because at these depths the gas bill is a real part of the operation.

Arc · 04

Bell, SPHL & Control

A diving bell or self-propelled hyperbaric lifeboat mates to the chambers to carry divers to the worksite at pressure and recover them — including in an emergency. Over all of it sits a redundant life-support control console: depth, gas, environment, communications, CCTV and diver monitoring, watched continuously.

Have a recompression chamber, hyperbaric or diving-system requirement? Send it across — clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference system, sized to your operation.

The parameters below describe a reference chamber-and-spread configuration. Depth rating, chamber count, occupancy, gas mixes and marinisation follow from the operation — treatment, experimental research, or a working saturation dive.

Illustrative image, not a delivered installation — a diving life-support control console: a stainless panel carrying rows of round depth and pressure gauges, gas control valves, communication handsets and blank monitoring screens, with a rack of gas analysers beside it, in a control room

Fig · 04 The life-support console — where the occupants’ world is watched — illustrative, not a delivered installation

Where diving systems actually fail

Almost never by bursting — a PVHO chamber is built with margin no one intends to test. They fail at the seams of the life support: a scrubber left past its cartridge life, an oxygen cell that drifted out of calibration, a heater that could not keep up with the helium, a reclaim loop that let a trace of contaminant back into the mix.

That is why the certification here is not only structural. The pressure envelope is proved to PVHO-1 and classed by a society; but the life-support loop — gas analysis, scrubbing, thermal control, redundancy — is the part that is watched every minute the chamber is occupied, and it is what the design, the console and the training in the scope of supply exist to protect.

Full specification — expand

System	Hyperbaric & saturation diving system — man-rated chambers, gas management, life support, control and handling · design, PVHO fabrication, integration, classification, installation, harbour and sea acceptance and training
Depth / Pressure	Chambers to the 30 ATA class (~290 msw seawater equivalent) · multi-compartment · multi-man living, experimental and treatment chambers
Construction	ASME PVHO-1 pressure vessels for human occupancy · acrylic view ports to code · medical locks (e.g. 12″ medlock) · transfer-under-pressure locks between primary and secondary compartments, each separately controlled
Breathing Gas	Air, nitrox and heliox (helium-oxygen) · gas blending and mixing panels · helium reclaim to IMCA standards for the wet diving chamber · oil-free breathing-air purity
Gas Supply	HP cylinder quads · HP diving compressors (air- or water-cooled) · gas boosters and storage · distribution to console and chambers
Life Support	O2 make-up within the hypoxia–toxicity window · continuous CO2 scrubbing · close temperature and humidity control (helium conducts heat ~6× air) · continuous gas analysis (O2, CO2, He) · BIBS for therapy and emergency · sanitary and medlock services
Recompression / Treatment	Treatment chamber re-pressurises a diver with decompression sickness to drive gas bubbles back into solution and treat on a therapeutic table · a standby requirement of every diving operation
Control	Dedicated life-support control console — depth, gas, environment, communications, CCTV, diver monitoring · redundant · continuous manned watch
Handling	Diving bell / submersible chamber or self-propelled hyperbaric lifeboat (SPHL) handling and mating for the saturation spread · emergency recovery under pressure
Classification & Marine	Appraised by DNV, IRS or LRS · containerised to DNV 2-7-1 where portable/offshore · firefighting (FIFI), diesel generation and sea- or air-cooled chillers as required
Sourcing	Diving compressors, gas boosters, CO2 scrubbers, analysers, view-port acrylics and breathing regulators are proprietary bought-in items · Neometrix, with its HP-gas division, engineers the PVHO chambers, gas and life-support integration, control console and reclaim loop · diving-systems collaborator for the turnkey saturation spread where a prior naval build is required
Status	Engineered to order — reference configuration, not yet built · quoted against naval and armed-forces diving requirements · depth, chamber count and spread settled at design review

PDF · 1 page

Hyperbaric & Saturation Diving Systems — Capability Sheet

Tender Response

Send your specification — compliance matrix in two working days

Variants

One discipline, four system shapes.

Tenders call this a recompression chamber, a hyperbaric complex, a saturation diving system or a diving spread. The discipline — man-rated pressure, engineered gas, watched life support — is common to all of them.

Var · 01

Recompression / Treatment Chambers

The medical face — two-man and larger treatment chambers with medlock, BIBS and therapeutic tables, for treating decompression sickness and hyperbaric oxygen therapy, kept on standby wherever divers work.

Var · 02

Experimental / Research Chambers

Multi-man hyperbaric complexes to the 30 ATA class for diving physiology, procedure development and man-rating trials — the deepest, most instrumented end of the range.

Var · 03

Turnkey Saturation Diving Systems

The full spread — living chambers, wet pot, bell or SPHL handling, gas reclaim and control — delivered and classed as one system, engineered with a diving-systems collaborator where a prior naval build is required.

Var · 04

Diving Gas & HP Compression Spreads

The gas heart on its own — HP diving compressors, boosters, quads, blending and reclaim panels — and diving-equipment support, drawn from the same high-pressure gas competence as our compression and charging systems.

Applications

Where it applies.

Wherever people must live, work or be treated under pressure.

A · 01Naval diving schools & diving-medicine establishments — treatment & research chambers

A · 02Saturation diving operations — naval and offshore, living chambers & spreads

A · 03Submarine rescue & escape training — hyperbaric support

A · 04Hospital & clinical hyperbaric oxygen therapy chambers

A · 05Warship & vessel-fit diving spreads and recompression facilities

A · 06Diving gas & HP breathing-air compression for diving establishments

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 What is saturation diving, and why keep divers under pressure for days?

Because the alternative does not scale. Every time a diver comes up, the inert gas dissolved in their tissues has to come out of solution slowly, or it forms bubbles — decompression sickness. The deeper and longer the dive, the longer that decompression takes, until for deep work it would consume most of the day. Saturation diving exploits a limit: past a certain exposure, tissues become fully saturated and simply cannot take on more gas, so the decompression obligation stops growing no matter how long the diver stays. So the divers are pressurised once to their storage depth, live in the chambers at that pressure for the whole job — days or weeks — commute to the worksite in a bell that stays at their pressure, and decompress a single time at the end. The chambers are their home, workshop and hospital for the duration, which is why the whole thing is a life-support system rather than just a set of tanks.

Q · 02 Why helium, and why go to the trouble of reclaiming it?

Two reasons drive the switch to helium. Under pressure, nitrogen becomes narcotic — "rapture of the deep" — and it also becomes dense enough that simply breathing it is hard work; helium is neither narcotic nor dense, so heliox lets a diver stay clear-headed and breathe easily at depth. The catch is cost: helium is expensive, finite, and a saturation dive uses a great deal of it. That is why the wet diving chamber carries a helium reclaim unit — it captures the gas the divers exhale, removes the carbon dioxide and moisture, tops up the oxygen and returns it to service rather than venting it to sea. IMCA, the industry body for offshore diving, sets the standards that reclaim system has to meet, because a reclaim loop that lets a contaminant back into the breathing gas is worse than no reclaim at all. Getting that loop right is a large part of what separates a serious diving-system builder from a fabricator of tanks.

Q · 03 What does the life-support system actually have to control?

Four things, continuously, for as long as anyone is inside. First, oxygen: the safe partial pressure sits in a narrow band — too low and the diver becomes hypoxic, too high and oxygen itself becomes toxic — and because the chamber is at pressure, that band corresponds to a small, carefully held percentage of the mix, made up as the divers consume it. Second, carbon dioxide: exhaled CO2 has to be scrubbed out continuously, because it accumulates fast in a sealed volume and is dangerous long before it is uncomfortable. Third, temperature and humidity: helium conducts heat roughly six times faster than air, so occupants lose body heat quickly and a heliox chamber must be kept warmer and its humidity managed, or the divers are cold and miserable at best and hypothermic at worst. Fourth, the gas itself is analysed continuously — oxygen, carbon dioxide, helium — so the console operator sees the atmosphere the occupants are actually breathing, not the one the system was set to deliver. Add built-in breathing masks for treatment and emergency gas, and that is the loop that is watched every minute.

Q · 04 What does “man-rated” or PVHO mean for a chamber?

It means the vessel is built to a code written specifically for holding people under pressure, not gas — ASME PVHO-1, the standard for Pressure Vessels for Human Occupancy. The difference is not academic. An air receiver can fail by leaking; a chamber with people in it cannot be allowed to fail at all, and it also has features an air tank never needs: large doors that seal against pressure yet open quickly in an emergency, acrylic view ports made and tested to their own strict sub-code, medical locks, and interlocks that make it impossible to open a door against a pressure difference. On top of the ASME construction, a naval or offshore chamber is appraised by a classification society — DNV, IRS or LRS — and portable units are built and tested as containers to DNV 2-7-1. Being man-rated is why a diving chamber costs and weighs what it does, and why it is engineered rather than merely fabricated.

Q · 05 How is a recompression chamber different from the diving chambers?

It is the same discipline pointed at a different job — treatment rather than work. When a diver surfaces too fast, or a saturation system has an emergency, dissolved gas comes out of solution as bubbles in the blood and tissues: decompression sickness, "the bends". The treatment is counter-intuitive but exact — put the patient back under pressure. Recompression shrinks the bubbles and drives the gas back into solution, and then a slow, controlled decompression on a defined therapeutic table lets it leave safely; pure-oxygen breathing periods through the BIBS accelerate the wash-out. So a recompression chamber is a smaller, medically-oriented hyperbaric chamber — view ports, medlock for passing in drugs and instruments, BIBS masks, a controlled table — and it is a standby requirement of every serious diving operation, ashore or afloat. The same chambers also serve clinical hyperbaric oxygen therapy for non-diving medicine, which is why hospitals procure them too.

Q · 06 Do you build the whole system, and where does Neometrix fit?

Honestly divided, and worth being precise about. Diving compressors, gas boosters, carbon-dioxide scrubbers, gas analysers, breathing regulators and view-port acrylics are proprietary items from established makers — nobody sensible reinvents a diver’s oxygen analyser. Where Neometrix is strong is the heart of the system: high-pressure gas engineering — boosting, blending, storage and reclaim — which is the same competence behind our compression, cascade and cylinder-charging systems, together with the man-rated chamber engineering, the life-support integration and the control console. For a full turnkey saturation spread, where the buyer requires the builder to have already delivered a naval saturation diving system, we engineer in collaboration with a diving-systems specialist — the same principal-and-partner route common to this class of naval work. To be plain about status: this capability is quoted against live requirements, and no delivered system is claimed on this page.

↗

High-pressure gas & life support from Neometrix.

Compression, charging and gas systems engineered at our Noida facility — the competence behind the diving system.

↗ HP Air

Mobile Gas Compression Unit

Breathing-class HP air — the compression discipline, made mobile.

↗ Cylinders

HP Air Bottle Test Facility

Requalifying the high-pressure cylinders a diving spread depends on.

↗ Gas Boosting

Nitrogen Cart with Booster

Mobile gas boosting — the booster heart, in another duty.

Browse all Neometrix product lines.

Get a quotation

Send your depth,
occupancy and duty.

The Defence Programmes 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 — diving systems Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — HYPERBARIC & DIVING LIFE-SUPPORT SYSTEMS ASME PVHO-1 · DNV / IRS · IMCA ENGINEERED IN NOIDA · INDIA

Keeping people alive at pressures the sea would not.

Decompress once. That is the whole idea.

Quoted against naval & forces diving needs

PVHO-1, classed by DNV or IRS

High-pressure gas is our home ground

Surface to seabed, and back once.

The Gas Spread

Living Chambers & Locks

Wet Pot & Helium Reclaim

Bell, SPHL & Control

Reference system, sized to your operation.

Where diving systems actually fail

One discipline, four system shapes.

Recompression / Treatment Chambers

Experimental / Research Chambers

Turnkey Saturation Diving Systems

Diving Gas & HP Compression Spreads

Where it applies.

Common questions.

High-pressure gas & life support from Neometrix.

Mobile Gas Compression Unit

HP Air Bottle Test Facility

Nitrogen Cart with Booster

Send your depth,
occupancy and duty.

Similar Products

Share This Page

Keeping people alive at pressures the sea would not.

Decompress once. That is the whole idea.

Quoted against naval & forces diving needs

PVHO-1, classed by DNV or IRS

High-pressure gas is our home ground

Surface to seabed, and back once.

The Gas Spread

Living Chambers & Locks

Wet Pot & Helium Reclaim

Bell, SPHL & Control

Reference system, sized to your operation.

Where diving systems actually fail

One discipline, four system shapes.

Recompression / Treatment Chambers

Experimental / Research Chambers

Turnkey Saturation Diving Systems

Diving Gas & HP Compression Spreads

Where it applies.

Common questions.

High-pressure gas & life support from Neometrix.

Mobile Gas Compression Unit

HP Air Bottle Test Facility

Nitrogen Cart with Booster

Send your depth,occupancy and duty.

Similar Products

Share This Page

Send your depth,
occupancy and duty.