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Mini- 4 Man Compact Saturation System

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The PDC 4 man compact saturation system has a very small footprint, and is an ideal, portable 4-man saturation system for general civils work at sea or diver training, where the duration of the saturation diving operation is limited to a maximum of 4 man work.

This is one of the smallest saturation systems operating in the world today if not the smallest and it is kept at PDC with the larger PDC 6 man saturation system which is also a small lightweight sat system compared to others.

Commercial diving Training

This PDC 4 man system provides a safe and cost-effective alternative to larger sat systems for diving operations down to 115 metres of water depth.
The owner of PDC Grant Jameson who has over 30 years of diving experience in the commercial diving industry is also a saturation diving supervisor who has spent time offshore working as a closed bell supervisor. He is also the Dive Supervisor on this small system as owner and operator he knows the system & its capabilities better than anyone else.

What is very unique about this sat system is that the Main Chamber and Wet Pot are also the Hyperbaric Rescue Chamber and this reduces the footprint & total weight of the system as well as provides the safety of the rescue HRC chamber. So if the vessel or barge carrying it had to sink the divers would be safe and they could be safely decompressed to surface in the HRC using the LSP (Emergency Life Support Package). Without this feature the divers would be dead as they have to be decompressed in a certain manner from a saturation depth.

The system is rated and equipped for saturation diving to a depth of 115 msw.

The PDC 4 Man System comprises of:
Light Weight Main Lock (ML) which doubles as a hyperbaric rescue chamber.

Fully outfitted, and ready for connection to the other components for operation. Inside diameter : 1800 mm
Overall length : 5,460 mm
Manways (2) int. diameter : 650 mm

Max. working pressure : 115 msw
Capacity : 4 divers max
Food/medical lock
BIB’s masks for therapeutic mixes & emergency breathing Caisson internal depth gauge

Emergency scrubbers
Internal fire extinguishers
Hyperbaric lights, main and individual bunk lights
Complete communication systems (main and emergency with full redundancy) Internal environmental control system
4 bunks
Surveillance CCTV

Transfer Lock (TL) nick named the wetpot which is part of the compact sat systems HRC. The closed dive bell locks onto the TL Trunk clamp:

Fully outfitted, and ready to operate. Inside height : 2 400 mm
Max. working pressure : 115 msw Viewports

BIB’s masks for therapeutic mixes & Emergency Breathing Emergency scrubber
Internal fire extinguisher
Hyperbaric lights

Complete communication systems (main and emergency with full redundancy) Internal environmental control system
1 toilet with safety device / hand basin / shower
Surveillance CCTV

Hyperbaric Rescue Craft / Chamber (HRC):

Ready for Mobilization and connection to the other components.
The complete assembly is part of the Main Chamber and Wet Pot (Transfer Lock) with rail launch system or float off option should the barge or vessel sink. weighs.
No extra weight and space for a separate HRC. The Main Chamber and Wet Pot / TL are also the HRC. This HRC unit floats on its own. This chamber system is designed as both living and HRC. It is designed to be rapidly uncoupled and launched from the stricken vessel or barge in the invent of a fire or sinking.
Included with the system is a Hyperbaric Rescue Control Van ( LSP Life Support Pack ) that enables topside personnel to control the decompression of the divers in the HRC from their storage depth to the surface in a safe and controlled manner, in the event the HRC system is deployed.

This HRC achieves practical compliance with IMO Resolution A17/Res 692. Inside diameter : 1,800 mm
Overall length : 3,280 mm
Weight empty 5300 kg weight kitted out 6500 kg

Max. working pressure : 115 msw Capacity : 4 divers
Food/medical lock
BIB’s masks for therapeutic mixes Caisson gauge

Emergency scrubbers
Living chamber for two divers
Integral deployment seats (4) with harnesses
Internal fire extinguisher
Hyperbaric lights, main and individual bunk lights
Complete communication systems (main and emergency with full redundancy) Internal environmental control system
Complete onboard gas system ( self contained for 72 hours)
IMO compliant life support system and personal survival packs including, lung- powered scrubbers (for 8 men)
Toilet and shower
On board emergency battery power supply
Surveillance CCTV

HRC (Hyperbaric Rescue Chamber/Craft)

HRC (Hyperbaric Rescue Chamber/Craft)

CLOSED BELL – Submersible Decompression Chamber (SDC) :

Closed Bell with side-mate bell: Inside diameter : 1800 mm
Height (overall) : 2,500 mm Diameter (overall) : 2,660 mm Maximum rated depth : 115 msw Weight (approx) : 6,000 kg fully fitted Capacity : 2 or 3 divers

Working Pressure : 115 metres
Internal volume for 2 or 3 divers 4,9 m3
Positively buoyant with maximum load, without drop weights Divers can release bell weights allowing bell to float up to surface On board emergency gas storage, O2 make up and bottom mix
7 x mixed gas 50 litre onboard gas cylinders
1 x 50 litre oxygen storage cylinder
Diver’s gas reclaim or without
Bell depth gauges internal & external reading from within bell Complete bell gas management system (divers, bell, bibs, O2, etc) CO2 scrubber
Full remote gas analysis (O2 and CO2)
Electrical and communications system (main and emergency) Emergency wireless “through-water” communications
External lighting (3x250w)
Internal lighting (2x20w)
Surveillance CCTV
On board power supply
Personal survival packs and lung-powered scrubbers
Emergency services “plug-in” panel

Closed Bell Internal Photo

Closed Bell Internal Photo

SYSTEM SKID FRAME ( Various Options Boxed or Open Skid )

The Main Living Chamber, TUP, (HRC) , LARS and SDC are incorporated on a single large steel frame skid. This framework was designed in order to lift the complete system or to enable the system to be broken down into components. The frame is strongly built and rigid in order to remove any deck anomalies on the vessel which eliminates mating problems with the Bell to the TUP TL (Wet Pot).

A- Frame or Gantry Bell Launch & Recovery System

A hydraulically operated A-frame brings the centerline of the bell from its mated position to about 1.2 m overboard the vessel.
One sheave for the bell wire and one sheave for the umbilical handling are fitted on top of the A-frame, as well as two sheaves through

which the clump weight wires are reeved. The A-frame also houses the umbilical retrieval spooling device.
For smaller spaces and where barge or vessel stability is an issue the bell has a Gantry Launch and Recovery System for a moonpool launch operation which prevents the tipping or leaning action of a barge or vessel.

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Bell Launch and Recovery Control Console
The launching control console includes the following: Bell winch : hoist/lower
Clump Weight winch : hoist/lower
Bell trolley : in/out
A-Frame : in/out
Umbilical Sheave : in/out

Bell Winch
Capable of rising/lowering the SDC (Bell) in air
S.W. load : 12. T
Line speed (hoisting) : 20 m/min in water 10 m/min in air
Approx 300m Wire rope : 26 mm diameter, non rotating
Drive : One electric hydraulic pump for normal service, One extra electric driven hydraulic pump for emergency service with emergency generator. Brake : Hydraulic primary brake & mechanical band brake on the
drum, hydraulically operated.

Hydraulic Power Pack
The hydraulic power pack for launching the bell comprises:
Two (2) 30 kW motor/pump assembly for winches
One (1) 15 kW motor/pump assembly for services
One (1) 30 kW motor/double pump assembly for emergency backup

The PDC – ROV is available for U/W CCTV observations with the sat system.

The PDC ROV has a depth capability of 200 metres

The PDC ROV has a depth capability of 200 metres

CCTV Surveillance
Video cameras are fitted at various strategic locations on the system to ensure personnel and equipment safety at all times. All video data
is recorded via a digital multiplexer. Specifically, the following critical components of the system are monitored:
HLC internal
TUP internal
HRC internal
SDC internal
Main bell wire winch
A Frame and main bell umbilical
HLC med lock
HRC med lock
Bell trucking clamp
HRC trucking clamp
Bell Trolley and Bell Clamping System
A trolley supports the bell when on deck: The bell is lowered onto the centre of the trolley. The trolley the moves hydraulically into position
for mating onto the TUP.

Main Bell Umbilical
The Main Umbilical is housed in a purpose built deck frame. The main bell umbilical is supplied with the following services: Gas supply lines to bell and divers
Hot water supply
Gas Reclaim
Bell atmosphere analysis Pneumo fathometers Power Cables
Hard wire communications

Diver’s Umbilical
The diver’s umbilical comprises the following: Main gas supply
Hot Water
Hard wire communications
The bellman’s umbilical is not fitted with reclaim or video services.



The PDC Closed Bell external below with the T.L. / (Wet Pot Chamber) on the right in the HRC frame with the TUP Trunk and Clamp for connecting the Bell.

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The Above 3 man PDC Closed Bell is normally used with the Mini Saturation system as the operations using this system are normally quick intervention dives and the bigger internal bell space allows for dressing the diver in faster.

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Main Lock / T.L. in HRC Frame with Trunk Clamp and Closed Bell

Control Van (Insulated and Air Conditioned)
Control van (Standard ISO container 20′, Mass 5.1T ) comprising:
Life Support and Dive Control
The chambers, VLC, TL and Dive control console includes the following

Gas Management Panel
In this panel the pressure of all gases coming from the HP storage is reduced to the required value and the gases are then distributed down stream as required.
he following HP lines enter the panel:
O2 (Pressure reduced at cylinders)
HeO2 mixes

SAT & DIVE CONTROL (Three Control Room Options)

SAT & DIVE CONTROL (Three Control Room Options)

Saturation Control Panel
The chamber control panel, for both the HLC and HRC, includes: Four (4) 10″ depth gauges accuracy 0.25%
One (1) 14″ decompression gauge
One (1) 6″ trunking gauge
Blowdown and exhaust valves
Metabolic oxygen make-up system
Valves for supply of therapeutic mixtures to the BIB’s. Three (3) communication system (with 100 % redundancy) Four (4) monitors for CCTV system
Full gas analysis
Hi/Lo pressure and temperature analysis

DIVE CONTROL PANEL (Various Options for weight & space)

DIVE CONTROL PANEL (Various Options for weight & space)

Dive Control Panel
The dive control panel comprises:
One (1) 10″ depth gauge for the bell external pressure
One (1) 10″ depth gauge for the bell internal pressure
One (1) 10″ depth gauge for the diver
One (1) 10″ depth gauge for the bellman
One (1) 6″ trunking gauge
Separate for each diver 3 breathing mix pressure gauges and control valves Blowdown and exhaust valves
Three (3) communication systems, with speech unscramblers (including a through water communication system)
Diver’s hat-mounted video control, monitoring and recording facilities c/w full redundancy
Monitor for CCTV system
Two (2) oxygen analysers for Diver Gas analysis
One (1) CO2 analyser for Bell Atmosphere analysis
One (1) O2 analyser for Bell Atmosphere analysis
One (1) CO2 analyser for Gas Reclaim analysis
One (1) O2 analyser for Gas Reclaim analysis
Gas flow alarms on the gas reclaim
DP alarms
Hotwater alarms

Machinery Container
The machinery Van is a Standard ISO container 20′, Mass 6.0T.

This container is usually installed below the control van and includes the following: Electrical Panels
One (1) power supply line is provided from the ship’s generator to the diving system. Another backup power supply is provided from a dedicated back-up generator.

Main supply to the Saturation System main switchboard for non essential services is 440v, 60Hz, 3 phase.
Main switchboard (non essential services) distribution panel
Emergency switchboard (essential services distribution panel including 220v main transformer/distribution panel)

Bell and chamber distribution panel provided for all services to the decompression chambers, transfer chamber and bell control.

Chamber Environmental Control Unit
Three chamber environmental control units, external to the chamber, are provided. Sanitary Water System
The sanitary water system is designed to supply service water to the living chambers for:
Shower and sink Toilet flushing
The system includes: Two (2) pumps
Two (2) accumulators/buffer tanks with pressure switch for automatic startup of the pumps
Two(2) water pressure regulating valves
Pipes, fittings and relevant accessories for correct functioning
Diver’s Hot Water
Two vertically mounted divers hot water machines are installed. Three (3) sets of elements can be switched on in turn to provide
hot water at a comfortable level to the divers. A pressure regulator is also installed to ensure the correct volume is supplied.
The hot water machines are provided with over temperature and water supply failure alarms.
Hot water flow rate : 30 1/min (approx)
Maximum pressure : 25 bar
Three phase electric motor : 5Kw 440v 60 Hz

Gas Reclaim System
The diver gas reclaim system comprises an LP gas return receiver, an HP gas supply cylinder, twin sodasorb CO2 removal towers,
O2 injection and O2 and CO2 analysis.
On commencing diving operations, the gas supply cylinder is charged with the appropriate breathing mix, the gas travels from the supply
cylinder to the divers helmet via the main bell umbilical and the diver’s umbilical. The topside Haskel compressors place a suction on the
return line and the gas travels back to the surface via divers umbilical, the bell internal water trap and reclaim panel, the bell external water
trap and the main bell umbilical. It then passes through sodasorb CO2 removal towers at which point it is compressed and sent to the supply
cylinder where additional oxygen is injected to make-up the required bottom mix pO2.

Guide Wire Winch and Clump Weight
Guide Wire Winch
Is a man-riding winch, which further acts as an emergency bell recovery winch. This winch is used to lower and recover the clump weight with a single guide wire reeved from the A Frame sheaves through the clump weight sheaves and back to the A Frame.
In emergencies the winch is able to lift the diving bell and the clump weight to surface.
S.W. load : 5.5 ton
Line speed : 40 m/min in water 15 m/min in air
Approx 500m Wire rope : 22mm diameter, non rotating.
Drum capacity : 500 metres
Drive : One electro-hydraulic motor
Brake : One mechanical band brake on the drum and one hydraulically operated

Clump Weight
The clump weight has a weight of approximately 0.5 tons in air and is handled by the guide wire winch through 4 sheaves. It is
used to guide the SDC and not allow it to twist or spin in the current.
The clump weight is fitted with stores bins for tools and diver’s bailout. A bell standoff is also an integral part of the clump weight.
Stores and Workshop Van
A 20ft ISO standard container, partitioned into stores and workshop. (Mass 5.0T)

PDC Emergency LSP ( Life Support Package ) Container

PDC Emergency LSP ( Life Support Package ) Container

This LSP is kept on the shore nearby incase the HRC is evacuated from the Barge or Vessel due to fire or sinking or any other emergency requiring evacuation.

Dive Support Vessel for Sea Operations 25,5 metres LOA length
7,2 Beam ( Width )
1,5 metres Draft

The Mini Sat System is Normally Carried on this small vessel

The Mini Sat System is Normally Carried on this small vessel

Internal of PDC Closed Saturation Dive Bell

Internal of PDC Closed Saturation Dive Bell