Transactions of the Royal Institution of Naval Architects Volume 23 (Paperback)

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. 1882 Excerpt: ...which they were fitted, and two have been materially modified, after a few months' trial, on account of their not giving economical results equal to the anticipations of their designers, not in either case on account of their having proved to be dangerous; of the five types of boiler approved of subject to frequent examinations, the results in every case have proved that the restrictions prescribed have been absolutely required, one type of boiler fitted in two coasting steamers having been found to have become somewhat damaged in the short space of three months between consecutive surveys; whilst two sets of similar boilers fitted in vessels not classed in Lloyd's Register making longer voyages, and therefore not subjected to the same amount of supervision, became absolutely dangerous, through their having been allowed to become dirty, and these have had to be removed. I think that this clearly shows that so far as form of boilers is concerned, any restrictions imposed by Lloyd's Register have not been uncalled for, while I think it will be conceded without question that on the subject of the use of mild steel for marine boilers coming to the front, the action taken by Lloyd's Register in approving of the material on being satisfied of its quality, greatly facilitated its introduction. Next, with regard to the restrictions imposed by Lloyd's Register in the matter of strength. All structures must be made with a strength in excess of the load which they are designed to bear, in order to provide for their safety in the event of the occurrence of any or all of the following contingencies: --Latent defects or flaws in the material. Errors or defects of workmanship. Exceptionally severe strains which may possibly be brought to bear upon the structures by causes ...