Page 33: of Maritime Reporter Magazine (December 15, 1973)

Pacific NW SNAME

Discusses Shipboard

Electrical Cable

Members and guests of the Pa- cific Northwest Section of The So- ciety of Naval Architects and Ma- rine Engineers recently met at the

Windjammer Restaurant in Se- attle, Wash., for the Section's first meeting of the 1973-74 season.

Russell V. Carstensen, electronics engineer of Puget Sound Naval

Shipyard, Bremerton, Wash., pre- sented the evening's paper, "The

Care & Feeding of Shipboard Elec- trical Cable."

The variety of electrical cable types available for shipboard use have evolved through years of dili- gent research, testing and actual shipboard application. While com- mercially pure annealed copper wire continues to be the single con- ducting element employed, drastic changes in insulation materials and methods of cable fabrication have contributed to longer and more effi- cient service life.

Over the years, two basic speci- fications for cable selection, con- struction and installations have evolved. For military applications,

MIL-C-915E has become the prece- dent standard, while commercial shipbuilding tends bo invoke IEEE

Standard 45. Neither faction, how- ever, specifically excludes the oth- er. Rather, mutual reciprocity ap- pears to exist as long as certain minimum criteria can be met.

To a large extent, cable type and size selection has been reduced from a complex design process to research of tabular lists. Without a clear understanding of the design factors involved in cable construc- tion, however, selection of the most efficient type from the 88 military and 288 commercial types available is a very difficult task.

M/G Transport Service

Requests Title XI

For Variety Of Barges

A Title XI application has been filed with the Maritime Adminis- tration by M/G Transport Service,

Inc., Ill East 4th Street, Cincin- nati, Ohio, in connection with 45 semi-open hopper integrated barges, 30 open hopper barges and four .barge integrated oil tank itows.

To ibe built by Jeffboat, Inc. at an estimated cost of $10,325,000, the vessels wiill be operated on inland waterways of the United States.

Norris Div. Introduces

New Actuators For

Butterfly Valves 'Norris Division of Dover Corpo- ration, Tulsa, Okla., has introduced new diaphragm actuators for on- off and throttling control of 90-de- gree butterfly valves.

Brad Bertrem, general manager of Norris Valve Operations, an- nounced that the pneumatically op- erated actuators are applicable for valves ranging in size from 2 inches to 24 inches and will handle differ- ential pressures to 200 psi.

Especially designed for 90-degree butterfly valve actuation, the actu- ators are available in 35, 70, and 180-square-inch diaphragms in both open and closed yoke versions.

The open yoke model is applic- able where precision control is re- quired and can he furnished with all popular models of positioners.

The closed yoke version is offer- ed where environmental corrosion requires a totally enclosed weather- proof unit.

Both types of units have an en- closed weatherproof gear and rack operator and are capable of oper- ating 2-inch through 24-inch valves with supply pressures from 5 to 65 psi.

Norris Division of Dover Cor- poration manufactures and markets butterfly valves, controls and re- lated equipment for all types of marine, commercial and industrial applications.

JacnziJet

MEANS

HORSEPOWER EFFICIENCY

AT All SPEEDS

JacuzziJet commercial propulsion units utilize an advanced mixed-flow design which was originally developed for the U. S.

Navy. This proved system features increased efficiencies throughout all speed ranges in addition to providing superior maneuverability.

JacuzziJet can be coupled to a number of diesel, gasoline or gas turbine engines for single and multiple installations insuring maximum flexibility in meeting performance requirements.

The impeller, the only internal rotating assembly, is carefully matched to each engine and custom trimmed to meet the exact performance requirements of the boat owner.

Since the JacuzziJet is a direct drive system, it provides an ideal "loading" condition on propulsion engines. If any damage should occur to the jet drive, the engine is "unloaded" rather than "overloaded" as in conventional systems. This affords the engine longer life.

Jacuzzi engineering and marine jet efficiency mean maximum use of horsepower for a longer period of time.

JACUZZI BROS. INC. / Marine Products Department / 11511 New Benton Highway / Little Rock, Arkansas 72203

Author Russell V. Carstensen (left), Puget

Sound Naval Shipyard, Bremerton, Wash., is shown above with Gene Frampton, vice chairman of the Pacific Northwest Section.

December 15, 1973 35