1. GENERAL

1.1 INTRODUCTION

The Drilling Tender TENAGA was designed and equipped with the latest state-of-the- art features available in the offshore industry.

It is a basic policy of BRUNEI SHELL that all operations are conducted in the safest possible manner in order to protect personnel, property and equipment from injury, loss and damage resulting from accidents.

This manual is intended to serve as an aid in assisting the personnel incharge to achieve this goal.

1.1.1 NATURE AND PURPOSE OF MANUAL

This manual relates to operation of the drilling tender TENAGA. The purpose of the manual is to ensure that the tender is operated safely and within its limitations. Personnel responsible for operation of the unit are to become familiar with the contents of this manual.

1.1.2 MATERIAL

This manual provides several descriptions of equipment and systems, basic data, operating procedures and restrictions, safety procedures and equipment. The drawings, tables and sketches follow the text for clarity. Refer to the equipments manual for details.

The format of this manual is such that revisions and additions can be made from time to time as required. When issued, such revisions and/or additions will be dated and sent to all users of record.

The original of this manual is dated January, 1978.

1.1.3 CLASSIFICATION AND CERTIFICATION

The TENAGA has been built to comply with the American Bureau of Shipping "Rules and Regulations For Construction of Barges For Offshore Service". SHE was built under Classification Survey for Unrestricted Ocean Service.

Her ABS Classification is:

+ A1 BARGE

1.1.4 OWNER, BUILDERS

OWNER

Brunei Shell Petroleum Company Limited

BUILDER

Marathon LeTourneau Offshore Pte Ltd

Jurong, Republic of Singapore

Hull No. 118

1.1.5 NAME, FLAG, HAILING PORT, OFFICIAL NUMBER

1.2 MAJOR PARTICULARS

1.2.1 GENERAL DESCRIPTION

The TENAGA is a barge-type steel all-welded construction drilling tender. The TENAGA has a range of stability that render it suited for operation off the Borneo coast during all weather conditions. The TENAGA is built to ABS rules and regulations for Construction of Barges for Offshore Service and is classed +A1 BARGE.

The hull is of standard design with spoon-shaped bow and stern for dampening effect. Bilge keels run full length at bottom port and starboard for roll dampening. To further decrease the roll and provide maximum operational stability and maximum crew comfort, the TENAGA is fitted with full-width stabilization tanks near the longitudinal centre.

For efficient towing characteristics, the hull is fitted with twin skegs to produce accurate tracking. The hull is framed and sub-divided such that there are two levels of equipment and accommodation within the hull above the double bottom. The aft main deck superstructure houses additional accommodations, offices and machinery space. The double bottom is divided into drill water compartments at centre longitudinally and ballast compartments around the periphery for maximum trim effect.

The tank top level forward contains the mud pump room with the fuel tanks situated port and starboard. The active and reserve mud and the brine tanks are located near centre, immediately aft is the domestic pump room. Furthest aft are located accommodations with the potable water tanks port and starboard.

The second deck level forward is compartmented such that the main electrical switch gear is located at the bow forward of the main generator room. Power generated is AC part of which is converted to DC for the drilling equipment motors. Aft of the generator room is located the active and reserve mud tank area. Further aft is the mud mix and sack storage compartments with bulk storage tanks located port and starboard. At the stern are located accommodations, recreation rooms, mess rooms and galleys with the cementing unit space just forward. Recessed into each side of the hull at the second deck level near the stern are the embarkation decks with watertight accesses to the second deck and a stairway to the main deck.

The main deck level has drill pipe, casing, and tubing racks with material handling cranes located one each port and starboard diagonally opposite for maximum efficiency. There are a total of four (4) double-drum mooring winches located on the deck, two (2) at the bow and two (2) at the stern. At the bow the mooring winches are covered with the widowmaker platform. Aft is the main deck accommodations, containing radio room, offices state rooms, hospital and emergency generator space. Atop the accommodations is the heliport which extends aft over the mooring winches. The forward port edge of the helideck has recessed the winch control room just above and aft of the logging unit and welding shop.

Located port and starboard at the bow and stern are the four double anchor racks which are specifically designed to accept the eight 20,000 lbs. Danforth anchors.

1.2.2 PRINCIPAL CHARACTERISTICS

1.2.3 WEIGHT AND CAPACITIES

The light ship weight and centres of gravity were determined from an Inclining Test conducted on 11 December 1977 by the Builder and from the Builder's Report as:

Light Ship Weight	3877.6 long tons
Light Ship Draft	7.63 feet
Vertical Centre of Gravity	22.74 feet
Long.Centre of Gravity	0.56 feet fwd of C.L.
Transverse Centre of Gravity	0.04 feet fwd of C.L.

NOTE:

The above values were verified and accepted by the American Bureau of Shipping

The term "LIGHT SHIP" is intended to represent the hull and other items of permanent construction, machinery, mechanical equipment, piping and all other outfitting and drill items which are more or less permanently attached to or aboard the unit. Machinery and mechanical equipment are included in the light ship condition at "wet weight" ie including water, oil and grease at normal operating level and with pipes full of liquid.

All major equipment and life saving equipment are included in light ship in their normal position, with:

• Crane booms stowed
• Anchors racked and
• Anchor wire stowed

In addition to items clearly included in the general definition above, the following items were also included in the calculation of light ship displacement and CG.:

• Eight anchor buoys and pendants
• Schlumberger unit, tool house with tools and supports
• Miscellaneous screens and enclosures

Items intended to be excluded from "light ship" are those items expected to be variable during normal operation, such as variable deck load, drill water, fuel oil, lube oil, ballast and any miscellaneous items which were not included in the light ship determination.

For various reasons, it is necessary that figures for the light ship condition be maintained current. The Barge Engineer shall maintain a list of all changes to items normally included as light ship. Such changes shall be computed periodically for updating of the light ship figures. In the interim, those changes shall be listed as vertical deck load in calculations made for reporting of vertical centre of gravity.

Note:

The light ship condition given above included 8 - 20,000 lb Danforth LWT anchors, each connected to 3,400 ft of 2" wire rope.

1.2.4 MAJOR HULL PIPING SYSTEMS

1.2.4.1 PUMP ROOMS

There are four hull pump rooms designated to contain the hull piping system pumps. These are auxiliary port, auxiliary starboard, domestic and water treatment room. The auxiliary pump rooms each has a sea chest for the ballast and sea water service systems. The auxiliary port pump room contains pumps, valves, manifolds and piping for the ballast, fuel (diesel), and dirty lube oil systems. All pumps and valves are locally operated. The starboard pump room contains pumps, valves, manifolds and piping for the bilge, engine cooling, fire and bow monitor systems. All pumps and valves are locally operated. The domestic pump room contains pumps, valves, manifolds and piping for the drill water, emergency fire, air conditioning and sanitary water systems. The water treatment room contains pumps, valves, manifolds and piping for the cold potable water and hot potable water systems.

1.2.4.2 BALLAST SYSTEM

The Ballast System is specifically designed to take on, transfer and/or discharge sea water ballast via two (2) 1.000 GPM centrifugal pumps. The pumps and manifolding for the sixteen (16) tanks are located in the port auxiliary pump room at Frame 10-14 of the Tank Top Deck Level.

The pumps are manifolded so that one pump is used primarily for the port tanks and the other pump for starboard tanks to prevent accidental free flooding from one side to the other.

Sea water ballast can be taken simultaneously from the port and starboard sea chests through Duplex strainers by way of 12" inter-connecting piping or from any 6" ballast tank pipe via the 10" suction header. Ballast water is normally taken on by gravity flow to the desired tank.

Ballast water can also be transferred via the 8" discharge header to any 6" ballast tank pipe or discharged overboard. Ballast and other tank valves are manually operated butterfly type.

The stabilization system (tanks 5C and 6C) is connected to the ballast manifolds by piping to control the fluid level of the system. A connection is also provided to enable the stabilization tanks to be filled with drill water.

The tank gauging panel located in the Barge Engineer's office provides remote indication of the fluid level in each ballast and stabilization tank.

The ballast system is connected to the engine cooling system for emergency/stand by service.

One ballast pump is energised from the main motor control centre and the other from the emergency generator system.

1.2.4.3 BILGE SYSTEM

The primary function of the Bilge System is to pump voids, bilges and washdown or other water which drains into the main sump. The two (2) 300 GPM Bilge pumps and the Bilge manifold system are located in the starboard auxiliary pump room at Frame 10-14 at the Tank Top Deck Level directly opposite the Ballast Pump Room. The bilge pump suctions are connected with a six (6) inch line running to the six (6) inch bilge header through a Simplex strainer. The bilge manifold in addition to taking suction from the main sump also takes suction from all main void tanks throughout the hull.

The main sump is divided into two, the port side being used for all potentially oil contaminated drains and the starboard side for the clean and soapy drains. Each side of the sump can overflow into the other side.

An Eductor energized form the main sea water cooling pumps is situated in the starboard side, the port side can be discharged through the oil/water separator.

The bilge pumps are energized from the main power system. All bilge line valves going to the header are of the stop check type.

1.2.4.4 DRILL WATER SYSTEM

The Drill Water System is designed to transfer drill water to the mud tank room in addition to providing high pressure wash down water for rinsing and cleaning decks and equipment. The two (2) 645 GPM centrifugal drill water pumps take suction through a ten (10) inch header from the four (4) Drill Water tanks via six (6) inch lines. The drill water discharge manifold is designed to provide drill water to the cementing unit, the mud and brine tanks, the drilling platform, the stabilization tanks, to all wash down stations on the tender and discharge undesirable water overboard or transfer drill water from one tank to another. Either pump can be used for any function.

The pumps are energized by the main power system motor control panel and are provided with a liquid ring priming system supplied with potable water.

1.2.4.5 POTABLE WATER SYSTEM

The Potable Water System consists of two (2) 200 gallon pressure sets, one for cold water and one for hot water, and four (4) potable water tanks located at the Tank Top Deck Level port and starboard of the Accommodation area aft. Potable water is provided to all wash basins, galleys, drink fountains, hospital, petroleum engineers laboratory, pump glands and engine jacket cooling system. The hot potable water set pumps water through the three (3) 110 gallon hot water heaters to the Accommodation area.

There are two (2) waster heat sea water distillation units of 400 gallons per hour capacity each, located in the main engine room which are used to fill the potable water tanks. Potable water can also be taken on from the port and/or starboard fill stations from an external supply boat or barge.

Drains from the wash basins, sinks and drink fountains which are serviced by the potable water system returns to the main sump tank and is then pumped overboard via the bilge pump system.

1.2.4.6 SALT WATER COOLING SYSTEM

The Salt Water Cooling System is designed to provide sea water for cooling the main engines, compressed air plant, air conditioners and water makers via two (2) 3000 GPM pumps which take suction from a sea chest and strainer.

The system has an inter-connecting line to the Ballast System for emergency supply when the cooling water pumps are unable to operate.

One salt water cooling pump normally provides sufficient water to cool the main engines and provide sea water for all other services. The pumps and valves of this system are locally operated in the starboard auxiliary pump room.

The pumps are energized from the main power system motor control panel.

1.2.4.7 FIRE SYSTEM

The Fire System includes a main 500 GPM pump, an emergency 500 GPM pump and a 1000 GPM bow monitor pump. The main and bow monitor pumps are located in the auxiliary starboard pump room and take suction from the main sea chest header the emergency pump is located in the domestic pump room and takes suction from the emergency sea chest or the main sea chest header. The system has an international shore connection on the starboard side at the main deck just forward of the accommodation.

The fire ring main includes several isolating valves to permit maintenance of the system. The main and bow monitor pumps are energized from the main motor control centre and the emergency pump from the emergency control centre.

The main pump is started automatically by the fire detection/alarm system and the emergency fire pump and bow monitor pump from the toolpushers office. The bow monitor and main fire pump are interconnected.

1.2.4.8 SANITARY SYSTEM

The Sanitary System is designed to provide sea water under pressure for operating and flushing the commodes and urinals throughout the barge. The pressure system comprises of a 200 gallon tank and two (2) 70 GPM pumps either of which can operate the system. However, in the event of an overload, both pumps will operate automatically.

Waster from the commode and urinals discharges to the sewage tank located in the inner-bottom. Sewage is picked up by either of two pumps and delivered to the sewage treatment plant where it is oxidized before being disinfected and pumped overboard. Manifolding is provided to permit direct overboard discharge.

The pumps are energized from the main power system. The sanitary system may also be pressurized by the air condition cooling pumps, if the pressure set is out of service.

1.2.4.9 FUEL OIL SYSTEM

The Fuel Oil System is designed to transfer fuel from the four main tanks to the fuel oil day tanks located in the main engine room, to the fuel oil day tanks located in the emergency generator room and to the logging unit by using either of the 50 GPM transfer pumps or the 400 GPM pumps. The system is also designed to transfer fuel from one tank to another, supply diesel for use in the mud system and to the cement pump by using the main diesel fuel pump. Fuel is filtered before entering the fuel transfer pumps and is purified with the Alfa Laval centrifuge.

The fuel tanks are filled from either the port landing deck or starboard main deck fill stations.

All fuel oil pumps are located in the port auxiliary pump room at the tank top deck level. Pump start/stop switches are located on the inboard bulkhead near the access doorway.

1.2.4.10 LUBE OIL SYSTEM

Lube Oil for the engines is stored in 43 barrel capacity tank in the main engine room. Lube oil is transferred to any main engine via a piping system from the storage tank by gravity flow.

Gear oil is stored in a 14 barrel capacity tank also located in the main engine room.

Waster oil is drained by gravity into the 61 barrel capacity dirty lube oil tank from which it can be pumped into barrels on the main deck.

1.2.5 MAJOR EQUIPMENT

The major items of equipment and their general locations are as follows: