A NEW Launch And Recovery System (LARS) for wet bell diving. The LARS is IMCA compliant and heavy duty, so suitable for use in harsh marine environments.
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The SMP Wet Bell Launch And Recovery System is designed within a compact operating footprint to minimise the required operational deck space on board a vessel or barge. Emphasis has been placed on ease of mobilisation and demobilisation so that costs are kept to a minimum. The Wet Bell LARS is IMCA D023 and D018 compliant and has Third Party Design approval to Lloyds Rules for Lifting Appliances in a Marine Environment.
When fully retracted by the hydraulic cylinders, with the wet bell and clump weight stowed on the heavy duty based skid, the size and dimensions of the Wet Bell System are exactly the same size width as an ISO 20’ container and shorter in the base length by approx 1.8 mtrs. The heavy duty based skid has ISO corner castings situated on each corner so that the system can be located on conventional transport or container ship for shipment with no out of gauge additional costs applicable.
The main components and features of the Wet Bell System are as indicated below:-
General Information Base and Winch Skid
Protective Stops are incorporated into the design fabrication, which support the ‘A’ Frame in the stowed position to avoid contact with the winches.
The hydraulic luffing Cylinders are connected to the base skid and ‘A’ frame clevises with 316 Stainless Steel pins, retained in position with bolted SS keeper plates.
The base frame is inset with a composite non slip corrosion proof grating, forming a safe operational area and walkway for personnel. Additionally there is an elevated structural pedestal above the Dive Control Cabin which incorporates the two hydraulic manriding winches and the proportional hydraulic control valves assemblies. The elevated position of the winches keeps the winch wires clear of the operational personnel working on the base skid.
The winches are integrally piped in 316 Stainless Steel to the hydraulic control valve assemblies, which in turn are connected directly to the supply and return hydraulic supplies from the hydraulic Power Units.
The base skid is additionally outfitted with two inward opening safety gates which remain closed when the Wet Bell is deployed over the side of the vessel. Incorporated within the safety gates are twin sets of 316 Stainless Steel multi-rollers which are utilised for umbilical handling if the LARS is used with a basket for conventional surface diving (optional).
The ‘A’ Frame movement to the inboard or outboard positions is controlled by operation of the hydraulic control valves. The ‘A’ Frame is fitted with a main central sheave, where the lift wire is positioned for lifting and lowering the Wet Bell. Additionally at each end of the top beam of the ‘A’ Frame there is a sheave for the clump weight wire and a stop end for connection of the clump weight wire end termination.
The cross head of the ‘A’ Frame also incorporates a high intensity spotlight for illumination during hours of darkness and an electrically interlocked safety trip which activates a failsafe lock-out system if the dive basket is raised above a safe preset level.
The fabricated Clump Weight design allows the Clump Weight wire to be doubled reeved through the twin sheaves which are situated at each end of the Clump Weight. This allows free travel of the Clump Weight in the event of emergency recovery of the Wet Bell, using the clump weight.
Dive Control Cabin
This is a 2438 mm x 2058 mm steel fabricated control cabin integrated into the steel structure of the winch package. This will be situated below the winch package with forward facing window to view the launch area and operation of the Wet Bell. There will be a side personnel door, workbench and air conditioning unit situated in the wall of the container. The container will be outfitted with strip lighting, emergency lighting and 13 amp double clad power sockets situated around the wall of the container. The container will have a fabricated steel floor and insulated wall and cladding internally.
On the wall of the container there will be a 3 diver mixed gas surface diving panel. This panel will be used for supplying mixed gases to Diver 1, Diver 2 and the Wet Bell. The panel will be piped to an inlet penetrator plate on the container and a separate outlet penetrator plate for supplies to the Wet Bell via the Wet Bell umbilical. The mixed gas surface panel will be wall mounted to one side of the workbench.
The Dive Control Cabin will be fitted with an external access door on the bulkhead wall to give unlimited maintenance access to the panel internal components.
The specification for the panel will include the following:
Diver Supply Section
Each supply will have its own high pressure inlet isolation valve and gauges and its own low pressure isolation valves and gauges.
Diver’s Control Section
This will consist of Diver 1, Diver 2 and the Wet Bell which will allow for any of the five inlet supplies to be supplied to either of the two divers independently and Wet Bell. There will be an independent emergency crossover valve between diver one and two. The panel will be fitted with three pneumo gauges 0-330 ft seawater / 100m. These gauges will be .25% accurate. There will be a facility on the panel to analyse Diver 1 and Diver 2 online gases including the Wet Bell. This will be via three digital analysers with HI/LO alarms fitted.
This panel is built in a custom built aluminium frame with a fully engraved front fascia with all valves clearly marked for ease of operation clearly showing the diver’s supply section and separate diver’s control section.
There will be space available for the Diver’s and Wet Bell CCTV system and a UPS system. This will be priced as an optional extra depending on the Client’s specification and requirements.
Within the wall of the cabin there will be an emergency kick out door for emergency exit and steel protected covers on the forward facing viewing windows for protection when the system is not in use.
Wet Bell - 2 Man (3 Man is Optional)
This is a 1.35 m x 1.89 m Wet Bell complete with an integrated overhead acrylic dome which allows for a 360 degree field of vision during operations. The acrylic dome is enclosed within an overhead frame complete with a protective grillage.
The wet Bell incorporates 4 x 50 litre high pressure emergency air/gas cylinders, Clump Weight wire guides, diver access points from both sides of the cage and seating for the divers. Hand hold points are situated within the Wet bell and 316 Stainless Steel safety chains are fitted at the diver access points.
The Wet Bell is also equipped with an internal overhead lift point for the addition of an unconscious diver recovery system.
The main structure of is made up of a heavy duty tubular section with the base section manufactured in Heavy Duty ‘I’ Beam to increase the in-water negative buoyancy of the Wet Bell. The main lift wire connection point incorporates two additional emergency lift points.
Wet Bell Umbilical
The SMP Wet Bell Umbilical comes in optional lengths but for this quotation we have assumed 120 mtrs. This depends on the working depth of the Wet Bell requirements. The make-up of the main bell umbilical is as follows:-
The Wet Bell umbilical is made up of highly flexible braided pressure hoses. The gas and pneumo hoses have polyurethane liners and reinforced fibre braid layers to offer abrasion protection. The hot water hose are constructed of the same materials but have a thermo-plastic rubber in the liner.
All cables for both comms and power are of high quality polyethylene core insulation and polyurethane sheaths are used as standard materials to meet the standard diving application requirements. All hose end fittings are fitted with swage phosphor bronze fittings.
Wet Bell Umbilical Power Sheave
The Wet Bell LARS is equipped with a fixed position Hydraulic Umbilical Handling wheel mounted above the winch section on a vertical stanchion. The rotational direction, speed and tension are controlled at the dedicated proportional control valve station.
The Umbilical handling wheel is manufactured to suit the minimum bend radius of the Wet Bell Umbilical which is client specific in terms of services required.
Additionally there is an umbilical roller quadrant mounted on top of the Wet Bell ‘A’ Frame for safe overboard and handling of the umbilical.
Two hydraulic Manriding Winches are fitted to the SMP Wet Bell LARS. The Winches are fitted with 16mm and 13mm rotational resistant galvanised steel wire ropes, which are crush resistant and reduce sheave wear. The winches are additionally fitted with robust drum / wire guards for additional safety.
Both hydraulic Manriding Winches are planetary type Winches of high performance with many years of severe service operation. The Winches are powered by high efficiency gear motors designed specifically for applications to provide smooth application.
The motor torque is transmitted and multiplied by the high efficient gear train enclosed within the Winch drums. All rotating components are supported by high anti-friction bearings and run in oil to minimise friction.
The load control system is maintained by a patented brake valve. The brake valve is also backed up by an internal multi-disc hydraulic release safety brake. Additionally an overrun clutch permits a free rotation through the brake in the hoisting direction only with immediate lock-up when the hoisting operation is completed.
Hydraulic Power Units (HPU)
The Wet Bell LARS is equipped with two single independent 30kW Hydraulic Power Unit mounted in front of the Wet Bell Control Cabin.
The Hydraulic Power Units are each equipped with 200 litre hydraulic reservoirs which support the electric drive motor mounted on noise suppression rings, bell housing, drive coupling and the fixed displacement submerged hydraulic pump complete with suction strainer. The hydraulic reservoirs are outfitted with side mounted inspection hatches, return line filters, sight glasses and fill points with desiccant breather. The installation of the two hydraulic power units gives the system 100% redundancy, with separate dedicated primary and secondary supplies in the event of failure of the primary unit.
The hydraulic circuitry is fitted with non-return valves and over-pressurisation safety valves which operate as and when required during the operation of the LARS. The unit is equipped with a shell & tube bundle seawater / oil cooler which control the hydraulic oil temperature, on the return flow to each oil reservoirs.
The unit is fitted with 3 x 3 port diverter / change over valves with linked handles, which can be switched very simply from the primary to the secondary hydraulic system circuits, without the need to disconnect or operate multiple changeover valves.
The Hydraulic Power Unit electrical 3 phase 380 – 440 volt distribution and 24 volt control system is built within a 316 Stainless Steel enclosure. The enclosure incorporates all the necessary controls to operate the system safely.
LARS Electrical Control Enclosure
The main electrical enclosure has two independent incoming main supplies via two 63 AMP plugged connectors. The mains supplies can be selected and activated at the main isolation switch giving 100% power redundancy. HPU No 1 and No 2 can also be selected and switched at the main electrical enclosure and activated by independent Start / Stop buttons, an emergency stop button is also incorporated. In addition a limit switch override reset button is installed to allow the basket to be lowered if the high basket limit is activated during operation. A Status indicator light is installed to confirm the 24 Volt control power is available.
LARS Lifting and Handling
The SMP LARS is supplied with the 4 off main lift padeyes which are bolted onto the main structure. This enables the padeyes to be removed for regular proof load testing as required by regulations without disturbing the ‘A’ Frame sea-fastenings onboard the Vessel.
In addition the LARS is supplied with a dedicated spreader beam and sling set suitably rated tested and certified for the full weight of the complete LARS, including the Wet Bell and clump weight.
Sacrificial Sea-Fastening Plates
The LARS is provided with a set of sacrificial plates which bolt in position to the LARS base skid and can be utilised for sea fastenings on the clients Vessel if required.
Depth Capability: 100 m Operational Depth
Design Appraisal: Lloyds Register of Shipping
Design Approval: Lloyds Rules for Lifting Appliances in a Marine Environment
IMCA Compliance: IMCA D023 & IMCA D018 (and D037 optional)
Wet Bell Cylinders: 4 x 50 Litre Cylinders 300 Bar rated
Wet Bell Dimensions: 1340 mm x 1890 mm
Length (approx): 4200 mm
Width: 2438 mm
Height (Operational): 4100 mm
Weight: 7000 kg
Hydraulic Power Units: 2 x 30kW HPU Tank Mounted Electric Motor & Submerged Hydraulic Vane Pump Set
HPU Electrical: 3 Phase 380 – 440 Volts 50 / 60 Hz
HPU Oil Capacity: 2 x 200 Litre Hydraulic Tanks with Inspection Covers
HPU Working Pressure: 100 bar @ 90 Litres / Min @ 1450 RPM
Seawater Oil Cooler: Shell and Tube Type Seawater 45 Litre / min @ 5 bar Max
Wet Bell Winch Manriding: 16 mm Dia x 120 Meters Anti Rotational Wire Rope
Clump Winch Manriding: 13 mm Dia x 240 Meters Anti Rotational Wire Rope
Dive Control Cabin: 2438 mm x 2058 mm x 2591 mm
Air Conditioning: For heating and cooling the Dive Control Cabin
Mixed Gas Control Panel: For Diver 1, Diver 2 and Wet Bell supplies
|Wet Bell Launch And Recovery System (LARS) With Control Cabin & Mixed Gas Panel (PDF)|
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