Buoy Brochure

Monobuoy range Specification Guide Valid from 2014

Table of Contents Basic configuration 4 Buoy options 14 Anchoring Options 17 Piping Options 18 Systems Options 22 Mechanical Options 29 Summary 35 Typical Buoy Performance 37

Guide to Monobuoys This basic guide has been designed by The Monobuoy Company to help terminal operators tailor and specify their CALM Buoy System requirements quickly and logically. The various choices and options are grouped into two categories:

BASIC CONFIGURATION

and

OPTIONS The Monobuoy Company Ltd can also provide full packages for Offshore Terminal Systems. More specifically we offer the following Terminal to Tanker packages: Pipeline End Manifold (PLEM) Anchoring Systems Fluid Transfer Systems Submarine Hose Systems Floating Hose Systems Hawser Mooring Arrangements Subsea Pipeline Installation

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The Monobuoy Company offers buoys with different Basic Configurations such as Hull Diameter & Height

Single or Double Hull

Number of Chain Legs

Centrewell & Main Slewing Bearing Size

Piping Paths and Nominal Diameters

BASIC CONFIGURATION

BASIC CONFIGURATION Hull Size

The Monobuoy Company offers three hull diameters, 12m, 10m and 8m and a variety of hull heights.

The 8 metre diameter buoy is designed for special locations which require low water depths and for use on smaller ship mooring operations. Maximum Mooring Force is 100T . Usual hull heights are 4.5m and 4m.

The 10 metre diameter buoy is designed for inshore application with water depths of up to 40 metres, and is ideal for mooring operations that are closer to the shore. Maximum Mooring Force is 250 Tonne. Usual hull heights are 5m and 4.5m

The 12 metre diameter buoy is designed for offshore application with water depths of up to 50 metres and beyond. The maximum mooring force is 400 Tonne. This is the most appropriate for the majority of terminals around the world. Usual hull heights are 5.5m, 5m and 4.5m

Hull 12m H=5.5m

Hull 10m H=5.0m

Hull 8m H=4.5m 5

Hull Diameter

8m 10m 12m

Mooring Force 100T 250T 400T

Skirt Diameter 11m 14m 16m

Typical Uses Specialist locations,

tankers 40 20 - 50 4.5 >40 15-40

BASIC CONFIGURATION Single or Double Hull

For operations in difficult conditions such as arctic waters the hull can be built as a Double Hull, providing at least 12 individual watertight compartments providing the maximum security in case of accidents.

Double Hull arrangement with 12 or 16 watertight compartments. Full access is provided inside double hull for inspection

Conventional Single Hull with 6 or 8 watertight compartments

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BASIC CONFIGURATION Anchoring Chain Leg Configuration

12 LEG PLAN

Can be installed on either an 8 anchor pattern or equally on a 6 anchor pattern.

6 LEG PLAN Can be installed on a 6 anchor pattern. This is the most usual configuration today.

8 LEG PLAN Can be installed on an 8 anchor pattern. This was used extensively in the past with the older type lower grade chain

3 2 LEG PLAN Can be installed on an anchor pattern of 3 pairs of chains, often used by other manufacturers turret buoys.

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Chain Pattern 8m Hull 10m Hull 12m Hull

4 evenly spaced (at 90)



6 grouped into 3 pairs (at 120)

12 (6 & 8 evenly spaced)

BASIC CONFIGURATION Anchoring Chain Leg Configuration

Several options are available for anchoring chain pattern. The most common pattern today, and the one recommended by Monobuoy is one of 6 chains evenly spaced. Older buoys were often moored with 8 evenly spaced chains. Some buoys are moored with 6 chains grouped into 3 pairs with each pair at 120 spacing. Finally, it is possible to supply a buoy with 12 chain attachment points to allow the buoy to be installed on either a 4, 6 or 8 chain pattern (equally spaced).

Possible Not Possible - Possible but not advised

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BASIC CONFIGURATION Piping

DESIGN PRESSURE For the low pressure systems the design pressure can either be 19.7 bar (ANSI 150# flanges) or 50.7 bar (ANSI 300# flanges) The 50.7 bar system allows for surge pressures to be accommodated. Note a standard hose with a Working Pressure of 300 psi (21 bar) can absorb a surge pressure of 31.5 bar.

Many piping configurations are possible to transport crude oil, refined products, LPG, methanol, water and a wide range of other fluids. The most common systems operate at low pressure (

BASIC CONFIGURATION Piping

FLUID SWIVEL & PIPE RUNS The buoy is fitted with a fluid swivel to pass the fluids between the piping on the turntable and the piping on the hull. This swivel can have one or more paths, up to a practical limit of 5. The paths can be small high pressure ones or large low pressure ones. For paths larger than 24 it is common to have twin outlets and twin piping systems which allow the use of compact pipe runs and valving, standard marine hoses and balances the high side loads on the swivel.

21 bar Product Swivel double path

Buoy with 5 Fluid Paths

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1st path 2nd Path 3rd Path 4th Path Hollow

Bore

Min.Buoy Size/

Centrewell Size Nom

Bore Piping

Nom Bore

Piping Nom Bore

Piping Nom Bore

Piping

34 2 24 10m/3.2m

28 2 20 10m/3.7m

34 2 24 16 1 16 12m/4m

12 1 12 12m/4m

28 2 20 16 1 16 12m/3.7m

12 1 12 12m/3.7m

20 1 20 16 1 16 12 1 12 12 12m/3.7m

16 1 16 12 1 12 8 1 8 8 1 8 12m/3.2m

BASIC CONFIGURATION Piping, Common Low Pressure Systems (

Moonpool / Main Slewing Bearing diameter

8m Hull 10m Hull 12m Hull

Normal 2.5m 3.2m 3.7m

Optional 3.2m 3.7m 4.0m

BASIC CONFIGURATION Centrewell & Main Slewing Bearing Size

The centrewell diameter is mainly governed by the number and size of submarine lines, whilst the main bearing diameter limits the mooring force. Typically a 3.7m diameter centrewell can comfortably house pipework for 2 x 20 and 1 x 16 submarine lines. The following Table shows the various combinations available. Centrewell

Diameter

Open or Closed

The next choice is the diameter of the centrewell (and hence the main slewing bearing diameter) and whether the centrewell is dry or open at the bottom. A closed, dry centrewell allows more complex piping systems to be installed as there is more dry volume, however there are several drawbacks. Submarine hoses are more difficult to install with Pull-in tubes needed which can corrode and cause centrewell flooding. A water-tight cover is required over the centrewell to avoid ingress of water inside the dry centrewell.

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The Monobuoy Company offers its basic buoys with only the items either required by Regulations and Rules or items which we consider necessary for basic operations. Standard Items include Navigation unit comprising Lantern, Battery and Solar Panel. Passive Radar Reflector 10T Pneumatic Maintenance Winch with sheaves and guides for hose pull in. Butterfly valves in the Centrewell and Turntable piping on every line. Hand Bilge Pump in each Buoyancy Compartment. Two Manual Fire extinguishers Two Lift rings 1T Lifting Davit for Swivel Dome maintenance

However many Options can be fitted as listed on the following pages

CHOICE OF OPTIONS

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OPTIONS LAYOUT - 1

Simple Protection Frame

Simple Multi-Bolt Manhole Cover

Sounding Plug

Mooring Lugs

Automatic Ratchet Chain Stoppers Polymer Chain

Hawser Bearings

Overboard Ballast Arm and Boat Landing

Boat Landing Jump Platform

10T Air Winch

Battery Box

50T Chain Tensioning Multi-Part Block

50T Chain Tensioning Tripod

Passive Radar Reflector

Navigation Lantern

Fog Horn

Hydraulic and/or Electric Swivel to feed Buoy Hull and PLEM

Swivel Leak Recovery Tank

Red = Optional Blue = Standard

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OPTIONS LAYOUT - 2

Partial Protection Frame

Overboard Pipe Protection Frame

Davit for Material Handling to Supply Boat

Monorail and Trolley for Material Handling

Divers Platform

Red = Optional Blue = Standard

Single or twin Mooring hawser bridle (Standard on 400T Buoys)

Vertical Welded Steel Fenders

Flushing By-Pass

Hose Pull in Guides

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The traditional cone type The automatic ratchet type. Twin-axis ratchet type.

This is the type fitted to older buoys.

This type has largely superseded to the cone type due to its ease of

operation.

Used almost exclusively on deep water buoys. Its main advantage is it reduces out-of-plane bending

fatigue on the chains

PHOTO

Available for all buoy types Available for all buoy types Only available on 12m diameter

buoys

ANCHORING OPTIONS Chainstoppers

The chainstoppers are all located in the skirt, outside the hull for easy maintenance and accessibility. Three different types of chainstopper are available.

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PIPING OPTIONS Buoy Valve Types

BUOY VALVE TYPES The standard type of valve supplied on the buoy is a manually operated butterfly valve. These are installed either side of the swivel, in the centrewell and on the buoy turntable to allow isolation of the floating hoses following flushing and for maintenance of the swivel and expansion pieces. The following Options are available: Actuated Butterfly Valves Manual Ball Valves Actuated Ball Valves

Should a telemetry system be fitted, then it is possible to monitor the position of the valves from shore and open and close the valves remotely.

Manual Operated Ball Valve on Buoy Turntable

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PIPING OPTIONS Subsea PLEM Types

Subsea PLEM TYPES The standard type of valve supplied on the subsea PLEM is a manually operated subsea ball valve. These allow full isolation of the buoy system including submarine hoses. The following Options are available: Actuated Ball Valves with umbilicals

up to the buoy

Piggable PLEM with barred Tees and 5D bends (for twin lines system)

Pig Receiver/Launcher mounted on

the PLEM (for single pipeline)

Should a telemetry system be fitted, then it is possible to monitor the position of the subsea PLEM valves from shore and open and close the valves remotely. Also Pig signalling can be transmitted to the buoy through the umbilical and then on to shore via telemetry.

Piggable PLEM (twin lines system) with Actuated Ball Valves

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PIPING OPTIONS Automatic Swivel Leak Tank

SWIVEL LEAK RECUPERATION TANK As the product swivels age they start to leak slightly. As part of our commitment to preventing pollution, Monobuoy fits as standard a Swivel Leak Recovery Tank. This tank has a sight glass and a hand pump to pump the leaked fluid back into the product lines. An Option is to fit a 24V electric pump that can either be controlled manually or automatically with level switches. Should a telemetry system be fitted then the tank level and frequency of pump operations can be transmitted back to shore.

Swivel Leak Tank with pneumatic pump

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PIPING OPTIONS Surge Prevention System

With long export pipelines and high flow pumps there is a danger of damaging pressure surges occurring should there be a sudden closure of a valve on the loading tanker. Modern hoses can accept up to 30 bar (450 psi) pressure surges and the buoy piping can be selected as a 50 bar system using ANSI 300 lb flanges. However in many cases the surge pressure can exceed this and then a surge protection system can be installed on the buoy.

The system comprises a fast acting high-flow relief valve and a surge tank in one of the buoy compartments. Signalling (via telemetry) can indicate to the shore that a surge has occurred and to trip the pumps. Alternatively the shore pumps can rely on their own high pressure tripe. The surge tank can be fitted with a pump to empty the tank following a surge.

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SYSTEMS OPTIONS Hawser Load Monitoring

Telemetry can be installed on the buoy to transmit both information from the buoy and commands to the buoy from the shore base or a hand-held unit with the Mooring Master. The most simple system is used to transmit real-time hawser loads to the mooring master and shore base. This system comprises a hand-held unit a load-cell on the buoy with signal processing unit and radio transmitter and a shore base unit connected to a PC.

7 Hand Held Unit for

Mooring Master

Buoy with Hawser under load

The distance from Buoy to Shore can be several nautical miles depending upon the radio frequency chosen.

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SYSTEMS OPTIONS Telemetry

The Telemetry System can be expanded to include a multitude of sensors, actuators etc. such as:

Hawser Load Monitoring

Battery Voltage and charging status

Valve Position and control

Meteorological data

Buoy Motions

Swivel Leak Tank Status

Greasing System Status

Surge Tank and Valve Status

Video Surveillance Camera

Navaids status & control

Chain angles and tension

Buoy Position

Floodlight Control

Telemetry Block Diagram

Typical Shore Base PC Display

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SYSTEMS OPTIONS Automatic Bearing Greasing System

The Main Slewing Bearing and Product Swivel Bearings require regular greasing. To ease the monotonous chore Monobuoy has developed, with the industries leading manufactured of lubrication systems, an automated greasing system. The system uses a small electric DC motor to pump the grease through metering valves to all the grease points on both the Main Slewing Bearing and the Swivel bearings. The cycle runs daily this ensuring the bearings are always fully packed with grease. Alternatively a system can be installed that uses a single point to connect a manual (or pneumatic) pump carried onto the buoy by the maintenance crew.

Grease Lines installed on Swivel Main Slewing Bearing Grease lines inside Turntable Box Structure

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SYSTEMS OPTIONS Lighting

To allow safe operation during night-time the buoy can be fitted with low-power LED flood-lighting.

This can be useful in the more Northerly areas where winter brings long hours of darkness or where terminals have a very high occupancy and need to berth during the hours of darkness.

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SYSTEMS OPTIONS Navigation Aids

This system can be expanded to include the following additions: Low Power LED Lantern Fog Horn (short or long range)

Fog Detector for auto switching of the

Fog Horn

AIS Transponder

Racon Transponder

Mile Fog Horn

Standard Unit

Fog Detector

As the systems expands there is a need to install a separate battery box, heavy-duty charging systems and a power control module. Charging systems are usually Solar Panels but can also be Wind Generators or Diesel Engines. The entire system can be integrated into the telemetry system to provide remote monitoring and control Battery Box

Solar Panels

As standard a buoy is fitted with a stand-alone Lantern/Battery/Solar Panel assembly.

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SYSTEMS OPTIONS Electric and Hydraulic Swivels

HYDRAULIC & ELECTRIC SWIVELS

Electric Swivel

Product Swivel

Hydraulic Swivel

In order to accommodate equipment mounted either in the buoy hull or on the PLEM, such as hydraulic operated valves, it is necessary to mount a hydraulic and/or electric swivel on the Fluid Swivel. This necessitates a hollow bore swivel to pass the hoses and cables through the centre.

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SYSTEMS OPTIONS Power

The basic buoy only has a single navigation lantern and this is powered by a self-contained battery and solar panel.

If hydraulic power is required (for valve actuation, pumping or winching) then we have developed a very efficient 24V DC Hybrid power pack. This pack uses accumulators which are charged when there is an excess of power being generated by the buoys generation system. The pack also has provision for an AC motor or air motor so that during chain tensioning operations the high demand of the winch can be met by a portable genset or compressor on the workboat.

Hybrid HPU for Deep Water buoy

If larger electrical system are selected then it becomes to increase the power generation and battery size by using a combination of more solar panels, wind generators or a small diesel genset.

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MECHANICAL OPTIONS Deck House

Some buoys over the years have been fitted with Deckhouses, fully enclosing the equipment inside. This gives the advantages of protection from the elements, a personal refuge and increased security. However there is a significant disadvantage in that maintenance is more difficult and the deckhouse is considered an enclosed space making personnel entry more difficult.

Turntable Buoy fitted with a Deckhouse

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MECHANICAL OPTIONS Rope Guard

The basic buoy has a simple hoop type rope guard mounted over the mooring bridle to prevent the mooring bridle and triangle plate impacting the swivel should a mooring hawser fail. Some buoys are fitted with a tubular rope guard cage that cover the entire buoy to try to protect all the buoy equipment in the event of a hawser failure. However, Monobuoy does not recommend this as these cages often get hit by the work boats superstructure causing extensive damage to radar, radio antennae etc. If a tanker bumps the buoy, its anchor can get caught on the cage and cause extensive damage and deformation to the cage, which often makes subsequent operations of the buoy difficult.

Small Rope Guard

Full Rope Guard

Simple Mooring Bridle Guard

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MECHANICAL OPTIONS Lifting & Hoisting 1

The basic buoy has a simple swinging davit mounted adjacent to the fluid swivel on the turntable. This davit is used with either a chain block or snatch block and winch to lift the swivel dome (for swivel maintenance) An option is to replace the davit with a single runway beam mounted along the centreline of the turntable piping. This runway beam can then also be used for lifting valves, expansion pieces and other equipment. On the ballast platform, a rotating davit can be fitted to allow transfer of load from the runway beam to a workboat.

Standalone Overhead Trolley Bean

Trolley Beam and Davit as part of a Protection frame

Rotating Davit

Runway Beam

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MECHANICAL OPTIONS Lifting & Hoisting 2 (Chain tensioning)

The basic buoy is not fitted with any method of installing or re-tensioning the anchor chains as many operators have a small crane barge locally available. However two options exist for tensioning chains from the buoy. A tripod can be installed at the ballast platform with a six-part block and tackle system fed to the 10T maintenance winch. This provides 50T pull for chain tensioning.

An alternative is to use a specially developed double-drum two speed winch which has a small 10T wire for maintenance and hose installation tasks and a larger 40t wire which can make a direct pull in the chains. The advantage is that a chain can be pulled up either from the seabed of from a supply boat in one continuous operation unlike the block and tackle system, making the buoy self-installing

10T Winch

Winch Wire

6-part Fixed Block

Removable grating giving the Travelling

Block access to the Chain Stopper

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MECHANICAL OPTIONS - Buoy Access

The basic buoy has a boarding ladder, with heavy duty fenders on either side, on the turntable opposite the floating hoses. This boarding ladder also incorporates the ballast arm which balances the weight of the turntable piping. Access to the buoy is either via this ladder or directly onto the hull deck from the bow of a workboat. Several options are available for boarding ladders. Custom access ladders can also be designed for specific clients needs.

Standard Simple Ladder Lower Ladder with Jump Platform at height of Support Vessel Gunwhale

No Ladder

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MECHANICAL OPTIONS Diving Operations

The basic buoy has no protection frame around the overboard piping or ladders.

Several additional options are available:

Protection Frame around the overboard piping. (shown alongside)

Ladders down either side of the Protection Frame

GRP Grating Divers Platform below the floating hose connection flanges.

Additional platform at the intermediate spool connection

In addition, the basic buoy has two diver access ladders down the inside of the centrewell (open moonpool type buoy only)

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Standard Alternatives

HULL SIZE 12m x 5m 8m or 10m diameter and heights from 3.5m to 5.5m

HULL CONSTRUCTION Single Hull Double Hull

ANCHOR LEGS 6 equally spaced legs 4 or 8 equispaced, 12 (6 and 8 legs) or 3 pairs of legs

PRESSURE RATING 21 bar with ANSI 150# flanges 50 bar with ANSI 300# flanges

PIPING PATHS Path 1 - 34" NB (2 x 24)

Path 2 - 16" NB (1 x 16)

Multitude of alternatives from single 38" NB to 5 x 12" NB

CENTREWELL SIZE 3.6m diameter 4.0 m diameter

SUMMARY BASIC CONFIGURATION

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Standard Alternatives

Automatic Ratchet

Dual axis type

Buoy Valve Type Butterfly, sandwich type Ball valve

Buoy Valve Actuation Manual Hydraulic Actuation

PLEM Non piggable Piggable from shore or from PLEM using divers

PLEM valves Manual Ball subsea type Hydraulic actuation from buoy

Swivel Leak recovery tank Fitted with manual pump Automatic pump

Surge Protection System - Surge valve and tank with or without powered pump.

Hawser Load Monitoring - Load cell with telemetry to shore and tanker

Telemetry - Telemetry system with a multitude of options to transmit &

receive from shore and tanker.

Bearing Greasing Manual multipoint Single point manual system

Fully automatic system

Floodlights - LED buoy floodlight system

NavigationAids Lantern, Battery, Solar Panel Fog Horn, Fog Detector, AIS, Racon

Aux. Swivels - Hydraulic and/or Electric Swivels

Full Decdkhouse over turntable

Partial Deckhouse over the Centrewell

Rope Guard Only Mooring Bridle Guard Partial or Full Rope Guard

10T hydraulic winch

50T tripod and sheaves and blocks for chain tensioning

40T continuous pull chain tensioning winch

Overhead runway beam and locking trolley with overboard

davit

Ladder and jump platform

No ladder or overhanging arm

Protection frame and two ladders down to divers platform

Addition of intermediate platform

Additional Solar panels, wind generator and batteries

24V DC HPU with AC and pneumatic input

Two ladders in moonpool. No divers ladder or

frame around the overboard piping.

Simple ladder on ballast platformBuoy Access

Diving

Power Small battery and solar panel integrated with

navigation lantern

Cone TypeChain Stoppers

-Deck House

Lifting and Hoisting 10T pneumatic winch, centrewell davit and

various guides for submarine and floating hose

pull.

SUMMARY OPTIONS

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8m Buoy 10m Buoy 12m Buoy

Water depths 10m to 30m 15m to 40m 20m to 80m

Tanker Size Up to 50,000 DWT 50,000 to 100,000 DWT Up to 350,000 DWT

Floating Hose lengths 130-210 m 210-240 m 240-310 m

Significant Wave height 1.5 m 2.0 m 2.5 m

Current 1 knot 1.5 knot 1.5 knot

Wind Speed 20 knots 25 knots 30 knots

Significant Wave height 3.5 m 4.5 m 5.5 m

Current 1.5 knot 1.5 knot 1.5 knot


Significant Wave height 7 m 8 m 9 m

Current 3 knot 3 knot 3 knot


Typical Performance

Typical Berthing Limits

Typical Operational Limits

Typical Survival Conditions (no tanker moored)

TYPICAL BUOY PERFORMANCE

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NOTES

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www.monobuoy.com

For more information, please contact us: Monobuoy Company Limited The Barn House, Station Road North Thoresby Lincolnshire, DN36 5QS UNITED KINGDOM Email: [email protected] Tel: +44 1472 840 571 Fax: +44 1472 840 093 Monobuoy SARL Le Richmond 22 Boulevard Princesse Charlotte MC 98000 MONACO Email: [email protected] Tel: +377 97 97 49 50 Fax: +377 97 70 37 92

Monobuoy Vietnam Mrs. Nguyen Thi Hien Email: [email protected] Tel: +84 98 78 30 999 Tunisia

Mr. Adbel Karim Ayed Email: [email protected]

Representatives

Libya Numidia Group Email: [email protected]

Indonesia PT Moment Construction Energy Email: [email protected]

UAE EPC Solutions Email: [email protected]

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