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PORT ELECTRIC NEW YORK'S LARGEST AND MOST DIVERSIFIED MARINE ELECTRICAL SPECIALTY HOUSE Complete line of domestic and foreign electrical supplies, equipment and replacement parts for all leading manufacturers, including... AIR CONDITIONING & REFRIGERATION Complete Equipment & Controls Refrigerants — Accessories Replacement Parts BATTERIES, STORAGE, WET (xide Surrette - Willard BRAKES, ELECTRIC Stearns Brake Co. Westinghouse Electric Corp CARBON RINGS & BRUSHES National Carbon Co. Spear Carbon Co. CIRCUIT BREAKERS E.P.E. - General Electric I.T.E. — Westinghouse COMMUNICATIONS EQUIPMENT Audio Equipment Co. Portable Power Megaphones Federal Sign & Signal Co Horns. Sirens, Signal Lights Hose McCann Telephone Co Alarm Bells, Sound Powered Telephones ELECTRONIC TUBES Receiving Transmitting Power — Radar FANS. ELECTRIC (AC-DC) Hunter Mfg. Co. Mueller Electric Co. FLASHLIGHTS & BATTERIES Bright Star - Eveready Ray 0 Vac - S.R. Browne FLOODLIGHTS Circle D - Crouse Hinds Portable Light Co. 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Oceanic Electrical Mfg Co., Inc Pauluhn Electric Mfg Co.. Inc Russell & Stoll Co. Simes Co. WIRE & CABLE IEEE #45 - Mil. Spec. Portable Cords Insulated Wire Magnet Wire WIRING DEVICES Arrow Hart - Bryant General Electric Hubbell P&S TURBINE DIVISION — Turbine and replacement parts REFRIGERATION DIVISION — Complete equipment and replacement parts SUBSIDIARIES AND AFFILIATES Supply Divisions Comet Marine Supply Co. Elkan Electric Cable Co. Manufacturing Divisions Hose McCann Telephone Co., Inc. Oceanic Electrical Manufacturing Co.. Inc. PORT ELECTRIC SUPPLY CORP. 155 157 Perry Street New York, New York 10014 (212) 255-4530 For Your Next Navy Standard & Marine Coils See Us! Quality Products Listing lOLMAC COIL, INC. Phone (509) 684-2597 COLVILLE WASHINGTON 99114 Lloyd's Register Completely Revises Rules For Marine Refrigerated Cargo Installations Lloyd's Register has completely revised the Rules for Marine Refrigerated Cargo Installations to take account of advances in refrigeration engineering technology and changing patterns in the method of trans- porting refrigerated cargoes at sea. Additions to the Rules as they relate to new construction are detailed below, and notes are given on certain revisions (See Section A) and omissions (See Section B). Further notes (See Section C) are given on the revised sections dealing with the peri- odical survey of classed refrigerated cargo installations onboard ships in service. ADDITIONS A new section sets out requirements for the design, construction and testing of re- frigerating plant supplying cold air to insu- lated containers in ships' holds. While many of the rules in other sections are applicable to refrigerated cargo instal- lations onboard containerships, new rules have been formulated especially for ships carrying refrigerated containers. A new rule, applicable to all classed re- frigerated cargo installations, stipulates that the classed installation must be completely independent of any refrigerating machinery associated with air conditioning plant, do- mestic refrigerating installation or process plant, unless full details of alternative pro- posals have been submitted and approved. The "Stand-By" or reserve unit may now be considered as an operating unit during the limited cooling-down period of a non- precooled fruit cargo. Rules relating to automated installations and to unmanned refrigerating machinery rooms are now included. Rules have been added in Section 3 for the design and testing of rotary displace- ment compressors, now widely used for large capacity installations. A new rule requires pressure vessels for use with ammonia above a stated size to be constructed to Class 2/1 or 2/2, with selected "Spot" radiography checks. The rules now require pressure vessels designed for temperatures below minus 40 °C and for vessels with a design temperature below 0°C, where the pressure/saturation temperature relationship does not apply, to be manufactured from materials that have been specifically approved for the proposed operating conditions. K 1176' BIG BERTHA WANTS TO MEET YOU! Public Dry Dock No. 3, also known as BIG BERTHA in some ship repair circles, wants to meet you. Located at Boston's Marine Industrial Park, BIG BERTHA (1176' long) doesn't enjoy being alone. That's why she's out to capture your heart by offering her superb facilities at reasonable rates to all interested ship repair firms and shipping lines. So don't be shy. Call BIG BERTHA and ask her for a date. You'll be glad that you did! Managed by: Economic Development Industrial Corp Kevin H. White/Mayor George Seybolt / Chairman Michael Westgate/Director For additional Information about BIG BERTHA Contact: Rick McNeil, Marketing Director Economic Development Industrial Corporation ot Boston 60 Congress St., Boston, Mass, 02109(1-617-725-3344) SECTION A REVISIONS Conditions to be complied with in order that the symbol J can be assigned to a classed installation have been amended to remove any ambiguity. While in the past, it was recommended that a reasonable margin in plant output, over maximum load, be provided, it is now a requirement to design the plant to have at least 5 percent excess capacity over that required for the maximum design output for the desired class notation. The formulae for determining the scant- lings of compressor crankshafts have been completely revised, together with the table of pressures and the manner in which re- frigerating plant components and completed installations are to be tested. Alternative methods for preventing cor- rosion of the external surface of steel pipes conveying brine, other than by galvanizing, may now be approved and rules referring to the treatment of the surface of tank top plating in way of insulation have been re- vised. The Section relating to insulating mate- rials and methods of application and the rule requiring cargo battens to be fitted in insulated cargo spaces have been reappraised. Cargo battens may now be omitted from in- sulated cargo chambers when fruit cargoes are carried, and alternative methods of main- taining air circulation between the insulated lining and frozen cargo, other than by cargo battens, may be accepted. The rules associated with thermometers and electric remote reading temperature measurement equipment have been updated to take into account modern technology, digital electronic temperature recorders and similar appliances. The rules setting out the procedure to be observed when carrying out the Society's thermal balance test have been enlarged and various points clarified. All the plant is to be tested under work- ing conditions and, when found to be oper- ating satisfactorily, the capability of the installation to perform the specific duty nec- essary to maintain the carrying tempera- tures assigned with the maximum sea tem- perature specified, is to be determined by the Society's thermal balance test. This test measures the capability of the combined plant and insulated chambers. It does not separately measure the insulation "U" value or the efficiency of the machinery. A thermal balance test may also be re- quired when an installation is being con- sidered for reclassification, when extensive repairs or alterations have been carried out, or when an amended temperature notation may be required. SECTION B OMISSIONS Reference to refrigerated cargo installa- tions using C02 (Carbon Dioxide) as a pri- mary refrigerant has been omitted, while rules related to the use of Refrigerant R502 are included for the first time. Rules referring to steam engines, or oil engines, no longer used as prime movers to drive refrigerant compressors, and to evap- orators and refrigerant condensers, of the "Coil - in - Casing type" (also no longer em- ployed in modern refrigerating installations), have been omitted from the rules under review. Reference to insulation, in way of coal bunkers and piping carrying a refrigerating medium through bunkers, has also been omitted. 20 Maritime Reporter/Engineering News
