The principles and practice of boiler construction; a manual of instruction and useful information for practical men - Softcover
Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ... the inner wide rivet strengthens the butt strap. In the J joints, as in the other examples, the outer rivets strengthen shell plate at narrow pitch, but there is nothing to support or strengthen narrow pitch in butt strap, consequently whatever deficiency or difference there is between the narrow and wide pitch has to be made up or compensated by increasing the butt strap's thickness over and above that required for ordinary evenly pitched riveting. Our wide pitch plate section is 84-7, and the narrow pitch only 69-9 per cent.; therefore the strap's thickness must be increased so that its strength at narrow pitch will also come out at 84-7 per cent. An examination of the Figures J and K shows that the arrangement of riveting is such that we have 5 rivets in each main pitch--four whole rivets and two halves in the zig-zag (J), and three whole rivets and four halves in the chain (K). All the rivets in each pitch are shaded, clearly showing what each rivet has to do, and this method may, as before stated, materially assist practical men in getting hold of what is in many instances only vaguely understood. Butt Strap Formula for J Joint. 5 x T x (p--d) = Ti, the strap's thickness. 8 x (8-3125-2-5) = H or, say, f in. thick For the distance between the rows the pitching of the rivets requires special consideration. It will be noticed that in the Figure 35 V (the distance between the outer and middle row) equals 3in., while V1 (the distance between the inner and middle row) equals 8T3ffin. only, resulting, of course, in a corresponding difference in the diagonal pitches. There is a very natural reason for this, as will be shown. The "formula" for finding V (the distance between the outer and middle rows of rivets) is:--/ Alx 8-3125 + 1-25 x (1 X 8-3125 ...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ... the inner wide rivet strengthens the butt strap. In the J joints, as in the other examples, the outer rivets strengthen shell plate at narrow pitch, but there is nothing to support or strengthen narrow pitch in butt strap, consequently whatever deficiency or difference there is between the narrow and wide pitch has to be made up or compensated by increasing the butt strap's thickness over and above that required for ordinary evenly pitched riveting. Our wide pitch plate section is 84-7, and the narrow pitch only 69-9 per cent.; therefore the strap's thickness must be increased so that its strength at narrow pitch will also come out at 84-7 per cent. An examination of the Figures J and K shows that the arrangement of riveting is such that we have 5 rivets in each main pitch--four whole rivets and two halves in the zig-zag (J), and three whole rivets and four halves in the chain (K). All the rivets in each pitch are shaded, clearly showing what each rivet has to do, and this method may, as before stated, materially assist practical men in getting hold of what is in many instances only vaguely understood. Butt Strap Formula for J Joint. 5 x T x (p--d) = Ti, the strap's thickness. 8 x (8-3125-2-5) = H or, say, f in. thick For the distance between the rows the pitching of the rivets requires special consideration. It will be noticed that in the Figure 35 V (the distance between the outer and middle row) equals 3in., while V1 (the distance between the inner and middle row) equals 8T3ffin. only, resulting, of course, in a corresponding difference in the diagonal pitches. There is a very natural reason for this, as will be shown. The "formula" for finding V (the distance between the outer and middle rows of rivets) is:--/ Alx 8-3125 + 1-25 x (1 X 8-3125 ...
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