Document a1j1XXDp88eBeeR84qd5269me

Johns--Manville began manufacturing a flat, asbestos-cement board in 190U for uaa as fireproof protection beneath ears of the Brooklyn Bapid Transit Company. It was so success ful in eliminating fires caused by sparks and short-circuits on newly-electrified trains that Johns-Kanrille named the new product "Transits" after the transit company it first served. Transits was soon being widely used as a structural building board. As the cost of steel buildings increased, a new demand developed for a roofing material capable of support ing itself on vide spans. Johna-ManvUle, by natural evolution, developed Transits in cor rugated font to fill these needs. Around 1921 the ecapany began manufacturing Transits in 2-5/8-inch corrugated sheets. These corrugated Transite riieets were effective on roof spans up to U5 inches long. As steel building construction costs kept rising, contractors found it economical to increase steel spans still further. Johns-Manville kept pace with these new Industrial re quirements by developing stronger Transits sheet in 1929, with a U.2-inch corrugation, that was effective on spans as great as U-feet, 6-inches. This corrugated Txansite product is still in vide demand today, having wiHistood rigorous tests in all the intervening years. The performance and excellent service record of Transits in both flat and eorrngated form, with its established corrosion-resistant qualities Inherent in the raw materials from which it is manufactured, made it a natural material for the rugged service required of under ground piping or industrial lines. Johns-Manville began producing Transits in cylindrical or tubular form in 1929 to service this type of industrial need. As in flat or corrugated Transits, three basic ingredients are used in the manufacture of Tzansite Pipe. These are asbestos fibres stronger than maiqr types of steel wire, cement and silica. They are consolidated under pressure to fora a pips wall of dense, uniform end homogeneous structure. After the pipe la formed it Is subjected to sir mod steam curing procei From Press Book for Opening: of Denison, Texas Plant 6/20/58 *r * ____ arnw SC-JMM-0100 TRANSIT* FIFE - 2 The steam curing contributes much to the stability and structural integrity of the pipe. Under action of high-pressure stean in sealed autoclaves. Transits assuses a naw chemical identity. The silica in its composition unites chemically with the free line ordinarily associated with cement products and converts it into highly stable calcine sili cates. As a result, the cured Transits pipe is unusually resistant to corrosive attack by adds, chemicals or fuses throughout its entire structure. A curious chemical fact is that the flniriied pipe weighs more than its original ingredients and thus gains added strength. Sines Transits was first produced in tubular form in 192?, maty thousands of miles of Transite pipe have been installed in the United States and Canada for use as water and sewer mains, irrigation and industrial pipe lines, building sewer pipe, telephone and electri cal conduit, air conditioning and other duets, vents, flues and stacks. In keeping pecs with ever-increasing demands by indimtxy, homes, farms and thousands of municipalities, Johns-Manville has expanded its Transits pipe manufacturing facilities to seven locations in the United States and Canada, strategically placed to speed deliveries and keep shipping costs down. In addition to the newest Johns-Manville Transits Pipe plant at Denison, Texas, other factories are in production at Marrero, Louisiana; Kanrille, Hew Jersey; Stockton, California; Vatson, California; Vaukegan, Illinois and Toronto, Ontario. The Johns-Manville Pipe Division, which operates the American plants, is represented at the company's Research and Engineering Centers at Manville, New Jersey. These are the largest facilities' of their kind in the world devoted to building materials, insulations, asbestoscement pipe, and allied industrial products* A permanent group of industrial research scientists and technicians are constantly occupied there in seeking new ways to improve and use Transits Pipe. They have at their disposal a completely equipped Transits Pipe pilot plant where the latest improvements are developed and factory-tested before being put into production at the seven operating locations. MORE T5AH: ITE PIPE - 3 In Manufacture of Transits pipe, asbestos fibres of various grades are selected and blended. Then, in predeterained proportions, the asbestos fibres are mixed with cement and silica. Enough water is added to disperse the fibres uniformly throughout the mixture. This mixture or slurry, as it is called, flows into a tank where a revolving drum of fine wire mesh deposits it in a thin coating on a broad, endless felt band. The moving felt carries it in a wide ribbon over vacuum chambers which remove excess moisture. The mixture is transferred to a revolving steel mandrel. Here the coating builds up continuously under pressure of heavy, hydraulically loaded rollers which compress it into s dense, homo geneous structure. In this way, s section of pipe the length of the mandrel is built-up until the desired wall thickness is reached. After the pipe is removed from the mandrel it is subjected to high nressure steam curing. . Modern equipment forms various types of Transits asbestos-cement pipe into- 10-foot and 13-foot lengths* with seme types ranging in diameter from 3 to 36 inches. Various types . have different strengths, depending upon the purpose for which manufactured. Seme pipe sections are available in half, quarter and one-third lengths, depending .on the particular kind of pips. This gives users great flexibility of choice. Most water and sewer pipes and many industrial lines and electrical conduits for dis tribution of power are buried underground where they are lmaedlately subjected to two types of corrosive attack - chemical and electrolytic. Chemical corrosion is caused by acids and salts encountered in the soil. Electro-chemical corrosion, an extremely complex process similar to action that takes place in a dry cell battery* occurs in metallic pipe when In stalled underground. Trsnsite pipe, being non-metallic, does not conduct electricity and is inamm to electro-chemical corrosion and is highly resistant to other types of corrosion. In addition to its high resistance to ordinary corrosion. Transits pipe has an added advantage of high flow capacity because of its permanently smooth interior surface. Liquids and' gases flew easily with a minimus of friction, permitting high carrying capacity and low pimping costa. START. COPY BOX NO./FILE DRAWER NO. NOTES pfcdjt/ Az/crj/ I - 1 ".LmUMlMHIlllULUMliJlM