The Kirby Morgan is the most widely used surface-supplied helmet in commercial diving. Its dominance comes down to a combination of proven reliability, parts that interchange across models, a worldwide spares network and a formal technician training programme that lets it be maintained and certified anywhere in the world.
Look at photos of commercial diving from the last forty years and the same object turns up in most of them: a fibreglass helmet with a circular viewport and a tangle of side valves. It's a Kirby Morgan, and it turns up so consistently that a lot of people simply assume it is the el commercial diving helmet, full stop.
No standard mandates it. Alternatives exist and are used. But understanding why this brand ended up as the de facto standard says a lot about how the sector really works: the most advanced piece of kit doesn't win, the one you can repair in any port at three in the morning does.
Where it comes from
The company grew out of the joint work of Bev Morgan and Bob Kirby in California during the 1960s. Morgan came from the world of rescue and early sport diving; Kirby from designing and building diving equipment. Their first products were full-face band masks and helmets meant to replace the heavy, classic hard-hat and canvas suit gear, which was much less practical for the industrial work the oil industry was beginning to demand.
The decisive leap came with the SuperLite family. The idea was a helmet that was light compared with traditional gear, with gas supplied from the surface via the umbilical, a demand regulator and a free-flow valve to vent the helmet. That basic scheme — gas from the surface, demand, exhaust, built-in communications — is still what today's models use.
The models you'll come across
SuperLite 17
This is the model that made the design popular and that the rest descend from. Many training centres still use it and there are still units in service. Its importance today is more historical than operational, but it explains the common architecture across the whole range.
KM 37
This is the workhorse of contemporary commercial diving. It's used in both surface work and saturation, and it's probably the helmet that racks up the most hours in the sector. Its virtue isn't any spectacular innovation, but that it's well known, tough, and everyone knows how to fix it.
KM 97
This is the most recent development at the top of the range, with a differently designed helmet shell and improvements in weight distribution and the neck connection system. It's showing up more and more in saturation operations.
Band masks
Alongside the helmets, the company also makes band masks such as the EXO-26 and models in the M series. These aren't rigid helmets: they're held on with a harness and offer less impact protection, but they're lighter and more comfortable for jobs where the mechanical risk is lower.
Why it dominates the market
Interchangeable parts
This is probably the decisive factor. Many components — regulators, valves, communication systems, viewports — are shared or compatible across models in the range. For a contractor with twenty helmets across three different models, that means a single spares inventory instead of three.
Global spares availability
There are authorised distributors and workshops in the world's main offshore hubs. If a helmet fails in Aberdeen, Macaé, Singapore or Dubai, the part exists nearby. A technically superior piece of equipment without that logistics network is an operational risk no contractor wants to take on.
Recognised technician training
The company runs a formal helmet technician course that qualifies people to strip, inspect, adjust and test the equipment. That certification is what lets a company show the client and the authority that its equipment is maintained by qualified personnel. Many divers take that course as extra training: it's a skill that's highly valued on board.
Documentation and traceability
Every helmet has a serial number and detailed maintenance manuals with service intervals and tolerances. In a sector where any incident ends up in a documented investigation, being able to show a helmet's full history has a value that goes beyond the purely technical.
How it fits into surface-supplied diving
The helmet doesn't work on its own. It's the end point of a system that starts at the deck gas panel and reaches the diver through the umbilical. That umbilical carries the breathing gas hose, the pneumo line for measuring depth, the communications cable and, in cold water or in saturation, the hot water hose for the suit. We break it down in the article on the diving umbilical.
The helmet normally comes with an emergency bailout bottle on the diver's back, connected to a valve on the helmet itself, giving a margin of gas if the surface supply fails. That redundancy is the essential difference between diving on a supply helmet and diving on scuba, and it's one of the reasons commercial diving doesn't use scuba except in very specific exceptions.
In saturation operations the helmet works the same way, but the supply comes from the bell instead of the surface, and the breathing mixture is helium and oxygen. The differences between the two regimes are covered in the article on saturation versus surface-supplied diving.
Maintenance: what really matters
A commercial diving helmet isn't equipment you buy and just use. It has a defined maintenance cycle with checks before and after every dive, deeper periodic inspections and scheduled replacement of elastomer parts and consumables.
The usual points of attention are the demand regulator and its adjustment, the gaskets and seals, the viewport and its mounting, the neck seal or neck dam system, the non-return valves and the communications system. All of it is checked with specific procedures and tools, and logged.
For the diver there's a direct practical consequence: on most operations the helmet is personally checked before every dive, and that check is the responsibility of whoever is about to wear it. It's one of the first routines learned in commercial diving training.
Alternativas reales
Kirby Morgan isn't alone. There are manufacturers with product in service, such as Divex — now part of the J2 Subsea/Unique Group — with its Divator line and saturation helmets, or Gorski, whose helmets are used mainly in contaminated-water diving and in scientific and institutional work. In certain niches, such as fully sealed contaminated-water diving, there are dedicated solutions that compete well.
What none of those alternatives has fully managed to replicate is the combination of installed base, spares network and critical mass of trained technicians. In a sector that's conservative for good safety reasons, that counts for more than any spec sheet. You can see more manufacturers and equipment categories in the equipment.
What this means if you're starting out
If you're going into the sector, you're going to learn on a Kirby Morgan and you're going to work with one. It's worth taking it seriously from day one: knowing the parts breakdown, understanding the gas flow, knowing what each valve does and being able to diagnose a simple problem.
And if you get the chance to take the helmet technician course, take it. It isn't a requirement for diving, but in a market where contractors value people who can solve problems on board, it's one of the best-value extra skills you can pick up in terms of cost versus return. The formal training options are in the directory of schools.
Frequently asked questions
Why doesn't commercial diving use scuba?
Because surface supply provides practically unlimited gas, continuous voice communications, depth measurement from the surface and a physical connection to the diver. The helmet also adds impact protection and an emergency bottle as a reserve. In industrial work those advantages are decisive.
How much does a Kirby Morgan helmet weigh?
On the surface, models in the range weigh around 13 to 15 kilos depending on configuration, but in the water the effective weight is much lower because the helmet's volume generates buoyancy. Trim is adjusted with weights and with specific weights fitted to the helmet itself.
Can a diver maintain their own helmet?
They can and should carry out the checks before and after every dive. Larger-scale maintenance, involving stripping and adjusting regulators and valves, is a job for a technician trained on the manufacturer's official course, and it is logged.
Which model is used in saturation?
Mainly the KM 37 and, increasingly, the KM 97. In saturation the helmet receives gas from the bell instead of the surface and the mixture is helium and oxygen, but the helmet's operating principle is the same.
Are there alternatives to the Kirby Morgan?
Yes. Divex, part of the Unique Group, and Gorski are manufacturers with product in service, and in niches such as contaminated-water diving there are dedicated solutions. None has reached the same combination of installed base, spares availability and trained technicians.
Published 20 August 2026 · By Arthur More, professional saturation diver
Photo: CNE CNA C6F · CC BY-ND via Openverse
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