Page 6: of Maritime Reporter Magazine (April 15, 1971)

The Tanker Jade— (Continued from page 6)

Steam is provided by two top-fired Kockum-

Combustion Engineering type V2 M8 boilers, each normally generating 46.6 tons of super- heated steam per hour at 860 psi and 950°F.

The maximum boiler output is 71 tons per hour. The boilers are provided with Ljung- strom-type rotary air preheaters of Svenska

Maskinverken's manufacture. Steam produc- tion and feedwater supply are maintained with- in narrow tolerances over the entire speed range by an electronic MK 3 TM type Kock- ums combustion control supplemented by two

Kockums flame guards, one in each boiler, for direct observation of flame quality in the fur- nace. These instruments are sensitive enough to distinguish a center burner failure even if both side burners are in full operation.

Electric power is normally supplied by a multi-disc Laval/ASEA turbo-generator sup- plying 1,250-kva, three-phase, 450-volt, 60- cycle current. The turbine operates on super- heated steam and also drives the main feed- water pump. As a stand-by, there is a similar single-disc turbo-generator set operating on desuperheated steam, and a 572-kva diesel- generator set which starts automatically if the main electrical supply fails.

Fresh water is supplied by two 40-tons-per- day evaporators.

During normal operation at sea, the main condenser, atmospheric condenser and lube-oil cooler are supplied with cooling water from a bottom scoop inlet. When the scoop flow is insufficient, circulating is automatically taken over by a vertical one-stage ASEA/Ruhr- pumpen main circulating pump and/or a simi- lar auxiliary pump.

The engine room is fitted with three plat- forms, giving four work levels spaced about 19J* feet apart. The upper platform, located only on the port side, is used to store spare parts. It can be served by the engine-room lifting gear and the gantry crane on the main deck.

The intermediate platform carries the boil- ers, engine-control room, diesel generator, main switchboard, air compressors and a work- shop.

SIGMA type port valve in bulkhead provides for the inter- tank free-flow system and greatly reduces cargo piping.

Overall engine room view looking aft towards the maneu- vering valves shows reduction gears and thrust bearing.

The lower platform is used for the main turbines' maneuvering valves, fuel-oil heaters and pumps, evaporators, feedwater heater, feedwater stand-by pump, fresh water treat- ment plant, turbo-generators, 1-p steam gener- ator, external desuperheater, and fuel-oil trans- fer pump.

The usual equipment such as turbines, gears, condenser, etc. are located on the tank top.

The engine-control room houses the major portion of the control and monitoring instru- mentation, grouped on a main console and a vertical panel with recorders and alarms. The alarm system, as is usual in Kockum-built ships, has an ATEW-type panel of alarm lights marking some 70 sensing points. Added to this usual installation is a novel electronic "speaking alarm" of the Vibratechniques con- cept and manufacture. When actuated, this system indicates by means of pre-arranged endless sound tape and several loudspeakers in the engine room, and by VHF pocket re- ceivers, the source and reason for the alarm.

The main unit also prints out on tape the same information together with the actual time of the alarm.

The five-bladed propeller, made of nickel- aluminum-bronze and supplied by Kobe Steel, has a diameter of 28 feet 2]/2 inches and weighs 48.4 tons.

Special Features

The navigating bridge deck only has width of 104 feet 4 inches, thus making it necessary to have long bridge wings. Each bridge wing is 32 feet 10 inches long and 3 feet 3 inches wide. The bridge house has a combined wheel- house and chartroom. In addition to a com- plete range of modern aids to navigation, it has details in excess of the normal. Most strik- ing are three conductor-type seats, adjustable in all directions, placed at the starboard for- ward radar PPI, at the steering section of the maneuvering console, and at the folding desk on the port side. A loudspeaker for music and an Italian expresso coffee machine also are permanently installed in the bridge house.

The electronic means of communications were chosen with great care. The main trans- mitter, of Dansk Radio A/S latest single side- band type, is provided with a novel high-preci- sion tuning device using only one basic crystal for all frequencies. There are Eicon-type corn-

Cargo control room from which most cargo valves are re- motely operated has mimic diagram of the cargo system.

The engine room main control console is located in the machinery control room on the intermediate platform. munal aerial systems for both radio and TV.

Each room has an outlet for AM/FM re- ceivers. From the entertainment receiving set programs can be relayed to all recreation rooms and officers' quarters. Two tape recorders fa- cilitate simultaneous relaying and recording.

The TV receiving system includes two turn- table communal aerials securing equal recep- tion on both sides, and a video tape receiver by which TV programs can be recorded for later use. The automatic telephone exchange can be connected to shore via a manual ex- change in the deck office.

Safety precautions against the outbreak of fire include among other things an LME auto- matic fire-alarm system with thermo detectors in the entire accommodation space, and Cer- berus-type smoke detectors in the engine room.

The navigation equipment includes two Kel- vin Hughes/Cie ETNA radar sets and echo sounder, Burk Sohne electric-clock system,

BEN electro-magnetic log, Patek Philippe SA crystal chronometer which constantly supplies correct Greenwich Mean Time, and Kockums supplied acoustic signals and Loadmaster com- puter cargo distribution instrument.

The Jade has been coated with Hempel products throughout except for the initial shop primer of International Nuplate A. Externally there has been applied a four-coat chlorinated rubber paint system, while plain epoxy coat- ings have been applied to the slop tanks, and a three-coat system of conventional properties to internal steel surfaces. 8 Maritime Reporter/Engineering News