jksubsea

Top 10 Must-Have Commercial Diving Equipment for Offshore Operations in India 2026

What equipment is needed for commercial diving offshore operations?

For any offshore surface-supplied diving operation, the minimum required equipment includes a Containerized Air Decompression chamber, Diving Air Panel, LARS system, Diving Machinery Container, Hydraulic Power Pack, 4 core Diver Umbilical, Commercial diving helmet, CO2 Scrubber, Cylinder quad, Diver communication system,. All equipment must meet IMCA D018, D023 and D040 standards before any diver enters the water.

Running a safe offshore diving spread in India means getting the equipment right before mobilisation, not during it. This is not a checklist for recreational diving. Commercial diving at 30 to 50 metres in Indian offshore waters, whether for ONGC pipeline inspection, subsea infrastructure maintenance, or port construction, carries real risk. The equipment either works to spec or the operation does not happen.

This blog covers each of the 10 essential pieces of equipment, what they do, why they matter for diver safety, and what certifications to look for when sourcing in India.

1. Recompression chamber (Air Decompression Chamber)

What is it?

A Recompression Chamber, also called a deck Air Decompression Chamber (ADC) or Dive Decompression Chamber (DDC), is a pressure vessel used to treat Decompression Sickness on site. It is the single non-negotiable piece of equipment for any surface-supplied offshore diving operation.

IMCA D023 is direct on this: no surface-supplied diving operation should proceed unless a two-compartment chamber is present at the worksite. There are no exceptions written into that standard.

Why it matters

Decompression sickness can develop within minutes of a diver surfacing. Getting a diver to a hospital-based hyperbaric unit in Indian offshore waters can take hours. An on-site containerized chamber changes that timeline completely and has saved divers’ lives in situations where shore-based treatment would have come too late

What certifications to look for

  • IMCA D018 and IMCA D023 compliance
  • DNV, American Bureau of Shipping (ABS) IR class, LR and BV class or TPI certification
  • Valid Hydrostatic test certificate (tested to 1.5x working pressure) And pneumatic test certificate (tested to 1.25x working pressure)
  • FMEA report
  • WPS, PQR and WPQ certification

Containerised DDC units are standard for offshore barge and vessel operations because they mobilise quickly and integrate directly with the life support panel. When sourcing a Decompression chamber manufacturer in India, ask for the full Documentation package, not just the chamber itself.

2. Diving Air Panel (life support panel)

What is it?

The Diving Air Panel, or life support panel, is the control panel where the diving supervisor manages Breathing Air supply to every diver in the water. It sits at the centre of the Dive Control Station. Everything the supervisor does during a dive runs through this Air panel

Why it matters

A surface air diving panel for offshore operations needs to handle at least two working divers and a standby diver (3 Diver) simultaneously or three working diver and a standby diver (4 Diver). It monitors gas pressure in real time, allows the supervisor to isolate or switch gas supply instantly, and triggers audible alarms if pressure drops below safe levels. If the panel is confusingly labelled, poorly built, or not pressure-tested, mistakes happen under pressure, literally.

What certifications to look for

  • IMCA D023 compliance
  • Pressure test certificate for all pipework and valves
  • Non-return valves on each diver line
  • Oxygen analyser connections
  • Integrated communications interface
  • Pneumo and pressure guage calibrations certification

Sourcing from a certified diver air panel supplier in India gives you faster lead times and accessible after-sales support compared to importing from Europe or the US.

3. LARS (Launch And Recovery System)

What is it?

A Launch And Recovery System is the mechanical structure that gets the diver safely from the vessel deck into the water and back out again. In calm water at an inshore jetty, the risk is manageable. In open offshore conditions with vessel motion and surface current, an uncontrolled diver entry can result in serious injury before the diver even gets to depth.

Why it matters

A properly rated LARS gives the supervisor physical control over the diver’s descent and recovery at all times. The diver basket holds the diver steady at the surface, the winch controls the rate of descent, and the guide weight reduces the effect of vessel motion on the umbilical and diver during water entry. Without it, diver entry and recovery becomes the most dangerous part of the operation.

What a standard offshore LARS includes

  • A-frame structure with base skid
  • Hydraulic main winch (man-riding certified, rated and tested to 1.5x SWL)
  • Stainless steel 316 diver basket, minimum two-diver capacity
  • Guide weight system
  • Hydraulic power unit

 

What certifications to look for

  • IMCA D018 and D023 compliance
  • Design Approval from Approving Authority such as DNV, ABS, IRS, BV or LR
  • Man-riding certification on the winch
  • Offshore container certification if containerised

For India-based projects, working with a LARS manufacturer in India avoids long import lead times and simplifies customs clearance. Compact LARS units designed to fit in a 20-foot container are popular for barge operations where deck space is limited.

4. Hydraulic Power Pack Unit (HPU)

What is it?

The Hydraulic Power Pack supplies pressurised hydraulic fluid to the LARS winches and other hydraulically operated equipments or tools on the diving spread. When the diver is in the water and needs to be recovered, the HPU is what makes that possible.

Why it matters

A hydraulic failure mid-recovery, with a diver suspended on the line in rough seas, is one of the more serious equipment failure scenarios in surface diving. HPUs for offshore diving need to be rated for continuous duty, not intermittent duty. They also need manual override capability so recovery can continue even if the primary power system develops a fault.

What to look for

  • Twin pump configuration
  • Pressure relief valves and filtration suited to marine environments
  • Stainless steel skid frame for corrosion resistance
  • Continuous duty rating
  • Manual override for recovery operations
  • Classification society certification

5. 4-Core Diving Umbilical

What is it?

The umbilical is the physical connection between the diver and the surface. A 4 Core Diving Umbilical bundles four components into one reinforced assembly: a Breathing Air Hose, a Communications Cable, a Pneumofathometer hose for depth monitoring, and a CCTV Cable

Why it matters

If the umbilical fails, the diver is on bailout. The Breathing gas supply, communications, CCTV and depth monitoring all run through this single assembly. A degraded hose, a weak outer sheath that cuts on a subsea structure, or a poorly terminated connector can cause any or all of those systems to fail simultaneously.

What to check when sourcing

  • Each core individually pressure-tested and recorded
  • Overall assembly tested to at least 1.5x working pressure
  • Outer sheath rated for abrasion against subsea structures
  • Connectors rated to working pressure

6. Diving helmet (commercial diving helmet)

What is it?

The Kirby Morgan Band Mask series, commonly called the KMB helmet, is the industry standard for surface-supplied commercial diving. The KMB 18, KMB 28, and similar models are specified on most offshore diving contracts in India. The helmet provides breathing gas supply, a demand regulator, free-flow capability, integrated communications, and head and face protection in one assembly with underwater light and underwater camera mounting frame mounted on the helment

Why it matters

This is the diver’s primary life support interface. The regulator inside the helmet controls how the diver breathes. A regulator that has not been serviced at the correct intervals, or one with counterfeit internal components, is not a minor maintenance issue. It is a direct risk to the diver’s life

What to look for

  • Service record for each helmet
  • Serviced by an authorised Kirby Morgan service point
  • Genuine manufacturer parts only (counterfeit regulator components are in circulation)
  • Communications transceiver tested and working before each deployment
  • Service documentation included in the diving contractor’s equipment register

7. CO2 scrubber

What is it?

A CO2 scrubber removes carbon dioxide from exhaled breathing gas in chamber life support applications. During a Decompression Treatment inside the chamber, the scrubber maintains Breathable Air Quality for the occupant throughout what can be a several-hour treatment table.

Why it matters

Carbon dioxide buildup inside a chamber is dangerous partly because it can incapacitate an occupant before they clearly recognise the symptoms. Running a scrubber beyond its rated capacity or using degraded CO2 absorbent material removes the safety margin entirely. This is an area where cutting corners is genuinely invisible right up until it is not.

What to check

  • Absorbent cartridges changed at rated intervals, never extended
  • CO2 analyser with audible alarm fitted and calibrated
  • Scrubber rated for the chamber volume and anticipated occupancy duration
  • Maintenance logs current

8. Cylinder quad (gas storage bank)

What is it?

A cylinder quad is a frame holding four or more high-pressure gas cylinders connected through a common manifold. On a commercial diving spread, cylinder quads store surface supply breathing air, emergency bailout gas, and chamber gas supply in a compact, crane-liftable format.

Why it matters

Gas supply continuity is not negotiable during a dive. Cylinder quads provide organised, accessible gas storage that can be isolated, connected, or swapped without disrupting the supply to the divers in the water. A poorly assembled quad with out-of-date cylinder test certificates is also a deck safety risk, especially during offshore crane handling.

What to look for

  • Each cylinder has a valid hydrostatic test certificate from a PESO-approved test station (India-specific statutory requirement)
  • Manifold assembly pressure-rated to working gas pressure
  • Isolation valves and burst discs fitted
  • Quad frame rated for crane operations with a valid lift certificate

When looking for a cylinder quad supplier in India, confirm the PESO test documentation on every cylinder individually.

9. Diver communication system

What is it?

A diver communication system connects the supervisor at the surface to the working diver through the umbilical. It typically includes a surface control unit at the dive console and an integrated transceiver inside the diver’s helmet.

Why it matters

IMCA D023 requires the diving supervisor to have direct communication with any diver in the water at all times during the dive. Loss of communications is a significant event. On most operations, loss of comms triggers an immediate ascent procedure.

For multi-diver operations, the system needs to address the working diver, the standby diver, and the surface team independently. Systems with built-in audio recording are increasingly specified by offshore operators because the recording serves as both an operational log and evidence in any incident review.

If your current setup is basic audio-only with no recording capability, check whether your project operator’s requirements demand something more. Some ONGC and international PSC contracts now specify audio recording as standard.

10. Diving Machinery Container

What is it?

The Diving Machinery Container, sometimes called the machinery room container, is the weatherproof unit that houses the, compressor gas banks, communications system, gas monitoring instruments, and diving supervisor’s workstation. Everything above comes together and gets operated from inside this container.

Why it matters

Offshore conditions in Indian waters, particularly during monsoon season in the Arabian Sea or Bay of Bengal, are not forgiving to equipment left exposed on deck. The container protects the critical control equipment, gives the supervisor a stable working environment, and allows the entire diving spread to be mobilised and demobilised as a single certified lift rather than as individual loose items.

For ONGC platform operations or PSC block projects where vessel time is charged by the day, the ability to move the whole spread in one lift makes a real difference to the project schedule.

What to look for

  • DNV 2.7-1 certification for container
  • Standard 10-foot or 20-foot offshore container construction
  • Correct amount of gas required (gas bank)
  • Correct cable penetrations for umbilicals and power feeds
  • Interior lighting to worksite illumination standards
  • Workbench and storage for spare components

Where to source commercial diving equipment in India

Most offshore diving equipment used in India today is either imported from UK or the US, or sourced from a small number of Indian manufacturers and suppliers. Working with an Indian supplier has straightforward advantages: shorter lead times, no customs delays, easier access to spares, and support teams who understand the practical realities of Indian offshore operations.

J.K. Subsea Engineering Pvt Ltd manufactures and supplies certified commercial diving equipment for offshore operations in India. Their range covers decompression chambers, diver air panels, LARS systems, hydraulic power packs, umbilicals, and complete diving spread packages, all built to IMCA standards with full certification documentation.

If you are planning an offshore mobilisation or procuring equipment for a new diving spread, contact J.K. Subsea Engineering with your project specifications and they will advise on the right equipment configuration for your operation.

Certification summary for offshore diving equipment in India

Equipment Standard / Certification
Dive Decompression Chamber IMCA D018, D023, DNV, IRS, ABS, LR and BV
Diver Air Panel / Life Support Panel IMCA D023, Pressure Test Certificate
LARS System IMCA D018, D023, DNV, IRS, ABS, LR and BV
Hydraulic Power Pack Class Society Certification, Continuous Duty Rated
4 Core Diver Umbilical Individual Core Pressure Test Records
Diving Helmet Manufacturer Service Record, Authorised Parts
CO₂ Scrubber CO₂ Analyser with Alarm, Rated Cartridges
Cylinder Quad PESO Cylinder Test Certificates, Lift Certificate
Diver Communication System IMCA D023, Audio Recording Where Specified
Dive Control Container DNV 2.7-1 Offshore Container Certification

FAQs: Everything You Need to Know

A commercial diving spread is the complete set of equipment required to run a surface-supplied offshore diving operation. It includes the decompression chamber, dive control system, LARS, gas supply, umbilicals, helmets, and communications, all working together as an integrated system.
The main standards are IMCA D018 (testing and certification of diving plant and equipment), IMCA D023 (design and operation of containerised diving systems), and D040.
IMCA certification is not a statutory requirement under Indian law, but it is required by most offshore operators, including ONGC, the Indian Navy and virtually all international diving contractors operating in Indian waters. Without IMCA-compliant equipment, most offshore diving tenders cannot be fulfilled.
They refer to the same piece of equipment used in different contexts. When a diver uses it to decompress after a normal dive, it is called a decompression chamber. When it is used to treat decompression sickness by increasing pressure again, it is called a recompression chamber. Offshore DDC units are built to handle both functions.

Related Posts

    GET IN TOUCH NOW

    REQUEST A QUOTE