Maritime History of the Great Lakes

Marine Review (Cleveland, OH), June 1934, p. 29

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Streamlined Fittings Used for Marine Service NE of the many innovations on the recently commissioned ferry steamer DELMARVA is the use of cop- per pipe and fittings on certain of the water and service lines, notably the bilge suctions, hot and cold water and sanitary plumbing lines. Sizes installed range up to 2% inches, This installation is of the patented “streamline” type, designed for sold- ered instead of screwed joints, and is the product of the Mueller Brass Co., Pert Huron, Mich. Distinct ad- vantages are claimed for the ‘“‘str.am- line’ fitting as compared with either the flared or threaded fitting, one of the chief of which is the ability to utilize a hard copper pipe, thus per- mitting reduced wall thickness with- out impairment of strength or safety factor while assuring a smooth, straight job of piping, free from kinks and sags. In this way, a ten- sile strength of 55,000 pounds per square inch is attained instead of 30,000 to 32,000 pounds, as in an- nealed or soft copper. The streamline fitting, shown in the accompanying illustrations, is quite different from any previously used jointure. According to the man- ufacturer, a long series of tests made by the Underwriters Laboratories Inc., and the National Board of Fire Underwriters, prove conclusively that a joint made with streamline pipe and fittings is actually a perfect bond of pipe, solder and fittings. The design of the fitting is clearly illus- trated, including the machined bear- ing surface, the solder feed channel and the drilled solder feed hole. The distance to which the pipe may be in- serted in the fitting is made positive by a shoulder in the fitting itself against which the pipe rests, and which is practically as high as the pipe is thick, thus reducing flow re- sistance to a minimum. Close tolerances between the pipe and fitting are maintained, so that the pipe fits snugly, and capillary attraction is utilized to bring about a perfect union between pipe and fit- ting. The surfaces to be joined are coated with flux and assembled, the assembly is moderately heated with a plumber’s torch or acetylene blow- pire after which the solder (in wire form and of special composition) is applied to the feed hole until a drop melts and at once is drawn through the hole and into the groove. Instan- taneously, the solder coats every por- tion of the joint and appears at the outer edge of the fitting around the full circumference of the pipe as a continuous silver ring giving a com- pletely bonded jointure of maximum strength. It makes no _ difference whether the feed hole is*located top, side or bottom in the assembly; ca- pillarity distributes the solder with Solider : feed HOS | see Soiter | «Feed Charice: A streamline fitting equal facility, a great advantage when working in confined spaces. For marine and aviation work, where resistance to vibration is a re- quisite, particular advantages over serewed joints are claimed. Vibration in a streamline installation is harm- lessly dissipated over the entire sys- tem and:not localized at any one point. Entirely aside from their es- sential qualification of corrosion re- sistance and lesser weight, it is pointed out that the glass-smooth in- ternal passages have been found by test to reduce flow resistance by 27 per cent. Shipyards throughout the country, including Pusey & Jones, Great Lakes Engineering Works, Defoe Boat & Motor Works and various others, have made streamline instal- lations on yachts and sea-going ves- sels for plumbing, hot and cold cir- culation, waste, fuel oil, low pressure steam, air and refrigeration lines. Among these installatitons are repre- sented 15 naval vessels, the ferry steamer Drn_MaArRv.A several yachts and other vessels. Sectional view of a three-way streamline fitting MARINE REVIEW—June, 1934 New Reclosing Device for Oil Circuit Breakers N INEXPENSIVE, direct acting reclosing device, designated as type SM has been developed by the General Electric Co. for use with oil circuit breakers. This attachment will reclose a breaker one, two, or three consecutive times, with equal time intervals between reclosures, when the breaker is tripped by overload. If the overload disappears after any reclosure, the attachment will return to its normal position and the breaker will remain closed. If the overload still exists after the last re- closure, the breaker will remain locked open and it will be necessary to close it manually before any fur- ther automatic operation takes place. The attachment is a mercury-tube device in which timing is obtained by running mercury through an ori- fice into a reclosing contact chamber. The tube has. sealed-in contacts which do not deteriorate or require maintenance. The number of con- secutive reclosures that the equip- ment will make and the time inter- val between reclosures is fixed dur- ing the process of manufacture. A new tube, however, can be readily substituted if a different number of reclosures or some other time inter- val is desired. Directly connected to the breaker mechanism the attachment is avail- able with both solenoid and motor operated breakers. It can be fur- nished with outdoor breakers and switch house equipments, it can also be supplied for use with indoor breakers which have various mount- ings such as pipe or angle iron framework and metal enclosed. New Multi-Purpose Seal NEW universal sealing com- pound has been developed by _the industrial division of the Ideal Commutator Dresser Co., Sycamore, Tll. This compound is non-soluble, non-corrosive, and non-oxidizing. It comes in a paste form, can be spread as thin as .001-inch, seals instantly, yet does not harden or become brittle. When used in connection with gaskets, or without them, or as a seal for flanged or threaded joints in fuel oil, steam, water, air, gasoline, lubricating oil, or in any type or size of pipe line, this seal cannot be washed out. It is not affected by atmospheric conditions and is heat resisting up to 400 degrees Fahr. it prevents rust or corrosion, and may be applied on any material or surface. It seals as perfectly as shellac, it is said, and yet permits quick and ready disassembly at any time. This new compound is free of grit and with its highly lubricant castor oil base is an effective rust-preventa- tive for threaded connection. . It also prevents corrosion. 29 ee

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