A Handbook on Piping

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D. Van Nostrand Company, 1918 - Hydraulic engineering - 359 pages
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Page 135 - ... of the valves with which it connects, and the discharge pipe shall be fitted with an open drain to prevent water from lodging in the upper part of the valve or in the pipe. When an...
Page 134 - The safety valve capacity for each boiler shall be such that the safety valve or valves will discharge all the steam that can be generated by the boiler without allowing the pressure to rise more than...
Page 135 - When a boiler is fitted with two or more safety valves on one connection, this connection to the boiler shall have a cross-sectional area not less than the combined area of all of the safety valves with which it connects.
Page 134 - No valve of any description shall be placed between the safety valve and the boiler, nor on the escape pipe between the safety valve and the atmosphere. When an elbow is...
Page 5 - Finally, the tube is passed to the straightening, or cross rolls, consisting of two rolls set with their axes askew. The surfaces of these rolls are so curved that the tube is in contact with each for nearly the whole length of the roll, and is passed forward and rapidly rotated when the rolls are revolved. The tube is made practically straight by the cross rolls, and is also given a clean finish with a thin, firmly adhering scale. After this last operation the tube is rolled up an inclined cooling...
Page 116 - B" which move vertically in slots. Supposing the valve to be open, the cam will be in the lower part of the chamber in which it is placed, :md the plug will be free to be easily moved. A quarter of a turn in the direction for closing it causes the cam to rise and take a bearing on the upper surface of the chamber, and the only effect of further effort to turn the stem in that direction is to force the plug more firmly to the seat.
Page 7 - The pull required to draw double-extra-strong (hydraulic) pipe by this process is so great, on account of the thickness of the skelp, that it is found necessary to weld a strong bar on the end of the skelp, thereby more evenly distributing the strain. With this bar the skelp is drawn through several dies of decreasing size, and is reheated between each draw until the seam is thoroughly welded. It is evident that the skelp is put to a severe test in this operation, and, unless the metal is sound and...
Page 6 - Butt-weld Process. Skelp used in making butt-welded pipe comes from the rolling department of the steel mills with a specified length, width, and gage, according to the size pipe for which it is ordered. The edges are slightly beveled with the face of the skelp, so that the surface of the plate which is to become the inside of the pipe is not quite as wide as that which forms the outside; thus when the edges are brought together they meet squarely, as indicated in Fig. 2.
Page 294 - Moulded sectional covering for use on low- and medium-pressure steam pipes. Made of asbestos fiber and other fireproof material. Weight per ft., 5.53 Ib., and thickness is 1.25 in. "VI. JM Wool Felt. A sectional covering made of layers of wool felt with an interlining of two layers of asbestos paper. May be used on low-pressure steam and hot-water pipes. Weight per ft., 2.59 Ib., and thickness 1.10 in.
Page 60 - Crosses 16 in. and down, reducing on the outlet, use the same dimensions as straight sizes of the larger port. Size 18 in. and up, reducing on the outlet are made in two lengths depending on the size of the outlet as given in the table of dimensions.

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