Page 79: of Maritime Reporter Magazine (October 1992)

For Cargo Management

A Total System

By Peter P. Lombard

According to the Oil Pollution Act of 1990, tankship owners now have unlimited liability for expenses aris- ing from oil spills. This should be enough to convince owners that the cost of installing the best safeguards is minimal when compared to the alternative high costs that could be incurred for damages.

Safety installation on a tank ves- sel takes many forms, including double hulls. Another important component is the level of gauging equipment. A complete system will monitor the levels of oil and water in the cargo tanks, as well as the bal- last and fuel tanks, at all times. A properly designed system will oper- ate even under conditions of severe trim.

One package installation which provides total cargo management is the Cargomaster system, manufac- tured and marketed by Skarpenord

Data a.s. of Langesund, Norway, and distributed in North America by American United Marine Corp. of Saugus, Mass.

Cargomaster is a closed, fully- integrated and computerized on-line cargo monitoring system of a type approved by all major classification societies. It is designed to be intrin- sically safe and to operate in zone 0.

All active components are located inside a central cabinet which is ordinarily located in the cargo con- trol room. Auxiliary monitors and controls can be located in any part of the ship. All cabling for the system is done with a four wire system, eliminating the effects of cable re- sistance.

Monitoring both liquid levels and vapor pressures, the system has built- in features such as a fixed high-level alarm and two adjustable level alarms which provide extra protection to the owner. Additionally, information can be transmitted either intermittently or continuously to the owner's offices on shore via satellite hook-up.

Data is acquired through

Skarpenord data transducers, which are resistant to all chemicals and liquids that are compatible with incology 625. These measure both pressure and temperature, and, un- like sensors used in other systems, contain no electronics either in the sensor itself or on the deck.

The transducers operate at tem- peratures of -25 to 125 degrees Cel- sius, and at over-pressures of five times the full output range. These units, which have no moving parts, are not affected by foam or incrusta- tion and require no cleaning. They are built to withstand the rigors of any type of tank cleaning.

The gauging system is distrib- uted throughout the vessel accord- ing to the following plan.

In tanks for cargo, fuel, slop and other service tanks: sensors for read- ing temperature and pressure, junc- tion boxes and cabling with protec- tion for it such as supports, clamps, and whatever may be necessary for mounting in the tank.

In ballast tanks: sensors for pres- sure, junction boxes and cabling.

Arrangement for draft: sensors for pressure, junction box, cabling and regulation valve.

Central unit: a working station complete with PC computer and all necessary electronics, 14-inch color monitor, keyboard, printer and mo- dem. Also, a signal and power outlet box and a complete atmospheric pressure arrangement.

Extra work stations, as desired: each contains a PC computer with color monitor and keyboard, fully networked with the central unit.

Additional equipment: a CR-200 level gauging system containing a main panel with four digital dis- plays, each with two lines of 16 characters and a printer for status reports. Also, remote alarm panels with a lamp, buzzer and an alarm reset button can be added and posi- tioned as desired. Local indication units for deck mounting or console mounting are also a part of the total system.

The installation of the equipment described in the above scenarios is designed to provide the following functions:

Continuous monitoring of liquid levels and pressures; inert gas pres- sure, draft fore, aft and midship; trim and list; cargo manifold pres- sure; and atmospheric pressure, va- por pressure.

Alarms for high and low liquid levels, high and low temperatures, high and low pressures of inert gas and vapor, high and low volume, density deviation ship/shore, and high and low cargo manifold pres- sure.

Automatic and continual calcu- lation of weight, with group totals; volume, with group totals; cargo density; ullage corrected for trim and list; and the load/discharge rate.

Interfaces to peripheral equip- ment, both analog outputs of the various measured parameters to ex- ternal systems, panel instruments, etc., and digital outputs for alarms, and automatic shutdowns of pumps and valves.

With the system, conversion is provided between all common units, such as: meters-feet; cubic meters- barrels; C Deg - F Deg; Tons-Long-

Tons; and Density-specific gravity-

API. A fully-integrated loading com- puter may be implemented as part of the delivery.

At a time when owners are being held responsible for damages caused by accidents at sea or in port, the

Cargomaster system provides not only an alarm and shut-down sys- tem in case of high or low levels of pressure, liquid level or tempera- ture, but also a continuous monitor- ing system for all important tank and vessel parameters. These val- ues can be observed at any time at any control unit aboard the vessel.

Peter P. Lombard is the presi- dent of American United Marine

Corp., an agent for Skarpenord.

For further information and free literature on the cargomaster sys- tem by Skarpenord Data a.s.,

Circle 88 on Reader Service Card

Winninghoff Delivers 50-Foot Work Sled

Winninghoff Boats of Massachu- setts was approached to design and build a boat capable of 50 mph speed to carry 24 tons of cargo. The vessel was to have a draft of no more than 2-1/2 feet with a hull which could handle a chop of three to five feet.

The original suggested size of the work sled was 44 feet by 14 feet.

While the parameters initially seemed incompatible, Winninghoff, with design and engineering assis- tance from the firm of Woodlin and

Marean, proposed a 50-foot by 12- foot vessel with an inverted vee- shaped hull, similar to the Hickman

Sea Sled hull form of a generation ago.

Work sled built by Winninghoff Boats.

The work sled has just completed sea trials, and with triple hp OMC

Sea Drives the company reports it has proven to be both fast and very maneuverable.

Low wake, high speed, load ca- pacity, stability and easy handling reportedly make this design a desir- able, versatile platform.

For more information on the ser- vices and capabilities provided by

Winninghoff Boats,

Circle 143 on Reader Service Card

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Circle 244 on Reader Service Card

J 619 Industrial Road

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Oakland, CA 94607 (510) 834 6000 (510) 834-7803 Fax

Anthony Del Gavio

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