Page 16: of Maritime Reporter Magazine (February 15, 1971)

New Grain Trimming

System Announced By

Algonquin International

A new way of trimming free- flowing dry bulk cargoes has been developed by G.T.R. Campbell (In- ternational) Ltd, of Montreal, Can- ada, and London, England, for the

Algonquin International Organisa- tion,

The system has been developed in consultation with the Canadian

Government, Department of Trans- port, under the direction of Capt.

J.L. MaeAngus and Capt. R.D.

Connors, and the U.S. National

Cargo Bureau, through Capt. S.F.

Sammis, and with their valuable assistance.

As with many useful inventions, this, the Canadian Grain Trim- ming System, is a simple solution to the problem of distributing free- flowing cargoes to those parts of the ship's cargo hold which are made inaccessible by overhanging decks. The system removes the drudgery of hand trimming and eliminates shifting boards. It also needs no special structural arrange- ments, such as sloping wing tanks, and takes advantage of the natural rolling and pitching movement of the ship, whereby effective addi- tional trimming occurs. An owner engaged in the grain trade and carrying high cubic cargoes, such as barley, can increase the cargo carrying capacity substantially through increased use of the un- derdeck cubic by the adoption of the system.

In recent years, almost all single deck bulk carriers have been con- structed with sloping upper wing tanks in order to obtain self-trim- ming for such cargoes. Such a structural arrangement reduces the effectiveness of the steel and there- by increases construction costs of such vessels. The maintenance and repair costs of such ships is also increased. The shape within the cargo holds also causes difficult and broken stowage with many other cargoes. It is therefore in the interests of both the shipbuilder and shipowner to avoid the use of sloping wing tanks in the ship's construction whenever possible.

With the present trend to build very large ships—where the steel saving from the use of rectangular wing tank construction is substan- tial, and the improved girder

The U.S. Department of Labor is enforcing new safety regulations applying to shipboard cargo handling gear and shore-based material handling devices. You need to know about the new test and certification standards if your equipment is used in ] shore-to-vessel, vessel-to-vessel or vessel-to-shore cargo handling.

There are new accreditation standards, too. And NSC is one of the few agencies fully accredited to certificate equipment anywhere in

I the U.S.

Our "Equipment Certification

I Services" booklet includes a reprint of pertinent sections of the new

I regulations, a summary of our services

I and our schedule of fees. Write for it today. There's no obligation. Better | still, if you have an immediate problem | or question about our services, call

Mr. Bruce Cantrell collect:

I (703) 245-3261.

THROW OUT TIE OLD RULES ON

CERTIFICATION OF MATERIAL

HANDLINGEQUIPMENT.

Please send your free booklet, ^^^Jjlpment Certification Services. |

Nuclear Service and Construction Company, inc. 9296 Warwick Boulevard

Newport News. Va. 23607

A Subsidiary of Newport News ShipbuikT

GET THE NEW ONES TODAY. strength of such construction is re- quired—this new trimming system which permits the use of rectangu- lar wing tanks will be welcomed by the industry.

The free surface effect and ex- pansion trunk arrangements in

OBO ships are improved when rectangular wing tank construction is applied. The Canadian Grain

Trimming System will therefore al- so make a useful contribution in this type of ship,

Statistics compiled from the broad cross section of bulk carriers establish that such vessels utilize their grain self-trimming features on the average of 22 percent of the ship's life. It is only free-flow- ing cargoes, such as grain cargo, which require this self-trimming feature, and in all other trades the sloping wing tanks are a disad- vantage. However, most bulk car- riers must be built with self trim- ming for grain because of the pre- dominance of the grain trade. This new system is therefore a natural development.

When ships of the same dimen- sion are compared, it will be found that the vessel constructed with rectangular wing tanks will obtain between five percent and nine per- cent more usable underdeck cargo cubic than those having sloping wing tanks. For example, the 21,- 500 tons deadweight Fortune-type vessel incorporates rectangular wing: tanks and applies the Canadi- an Grain Trimming System. This ship has almost 100,000 cubic feet more underdeck cargo space than any of the other similar size ships presently on the market and con- structed with sloping wing tanks.

This is apparently one of the fac- tors which has influenced those prominent shipowners who have placed orders for a total of 16

Fortune vessels.

In the development of the sys- tem, large scale model tests have been conducted by the designers in cooperation with Ishikawajima

Harima Heavy Industries Co. Ltd. of Tokyo, Japan, in order to es- tablish the various constants ap- plicable to the various desien para- meters. The system has been in- stalled in a recently delivered Free- dom type vessel, from which actual performance data has been record- ed with a grain cargo transported from the U.S. West Coast to Japan.

The 1960 SOLAS rules and

IMCO recommendations governing the carriage of grain cargoes al- ready envisage the more efficient use of the ship's structure in the safe transportation of grain in bulk.

The Canadian Grain Trimming

System is a step toward supple- menting the action of this active international organization. The principles applied in the system are such that it is possible to establish the ship's stability with a given cargo of grain or similar cargo, pre- cisely.

For further information, contact

The Algonquin International Or- ganisation, 455 Craig Street West,

Montreal, P.Q., Canada.

D.S. Walker Promoted

At Boston Towboat

David S. Walker

Eastern Gas and Fuel Associates has announced the appointment of

David S. Walker as manager of its

Boston Towboat Company subsidiary.

Mr. Walker, who has been associ- ated with Eastern for 34 years, has been assistant manager of towboat operations since 1965. He is a mem- ber of the Foreign Commerce Club and a vice president of the Propeller

Club, Port of Boston.

A U.S. Navy veteran, Mr. Walker attended Burdett College and Bent- ley College.

ALL-ALUMIKUM: Weighing 165 tons, the 78-foot Bill Angus shrimp trawler recently underwent its first sea trials. The all-aluminum vessel is the first of five to be built by

Lantana Boatyard, Lantana, Fla. Operating speed is 1 0 knots, and it is designed to stay at sea for as long as 70 days. While the Lantana 78 is small in size, she is big in capacity. Her fish holds will accommodate 600 boxes of shrimp. A total of 65,000 pounds of aluminum plate and structural members was supplied by Reynolds Metals

Company for construction of the ship. 18

Maritime Reporter/Engineering News