ICE - Institution of Civil Engineers - Virtual Library

Proceedings.] DEWRANOE ON CORROSION OF MARINE BOILERS. 107 27 February, 1900 SIR DOUGLAS FOX, President, in the Chair. (Paper No. 3225.) " Corrosion of Marine Boilers." JOHN By DEWRANCY, M. Inst. C.E. THEintroduction of water-tube boilers and the use of oontinually higher working pressures have rendered the subject of this Paper of increasing importance. Corrosion in marine boilers is principally due to the chemical union of the iron of the plates and tubes with oxygen dissolved or mixed with the feed-water, the product being an oxide of iron...

152 FOWLER ON BOILER EXPLOSIOSS. 29 January, 1895. J O H N WOLFE RARRT, C.B., -Vice-President, in the Chair. ___ ( P a p w No. 2769.) (Abvidyed.) " Boiler Explosions." By WILLIAX HENRY FOWLER, Wh.Sc., Assoc. 31. Inst. C.E. subject of boiler explosions in its broad engineering aspect; and before entering upon the considera,tion of it, some of the old theories of boiler explosions maywell be recapitulated,although i t is not now worth while to refute them...

174 DISCUSSION ON BOILER EXPLOSIONS. [Minutes of Discussion. Mr. J. WOLFE BARRY, C.B., Vice-President, i n moving a vote of thankstotheAuthor,saidthesubjecttreated was of such importanceastowarrant a carefulandpainstaking discussion, concerning as it did the welfare and safety of so many persons. llr. Longridge. Mr. MICHAEL LONGRIDGE remarked that subject the of boiler explosions had occupied the attention the Institutionon previous of occasions. He believed that two Papers on the subject had been read, both of them some time ago, and both by foreigners...

194 DISCUSSION ON BOILER EXPLOSlONB. [Minutes of Mr. Fowler. precise magnitude it was of course impossible to say ; but the groovingitself afforded irrefutable evidence of their existence. Mr. Beaumonthad also said that the grooves seemed always to occur whenbendinghadputthematerialundertensilestress. That, however, was not the case. The stresses which set up the grooving were sometimes alternately compressive and tensile. It was, in fact, thevariationinintensitywhichfretted and deteriorated the material locally. With regard to the stresses to which Mr. Barry had referred, hewasdiscussingthe effect of cutting large openings in boiler shells, and he somewhat regretted thatthatmatterhadnot been dealtwithalittle more fully...

STEhM ROILERS. 397 wants of those who require a motive power, but whose premises are generallyilladapted to a f h d t h e necessary spacefor a steam boileroftheordinaryconstruction. T h e boilerwhichhas been described, supplies steam for an engine of 2 H. P. and occupies a space of 3 feet 3 inches diameter by about 4 feet height, in including the brickwork. Numerous moditications will assuredly suggested, the be by practical engineers to whom this boiler is submitted, and to whose candid consideration the a u t h o r commits a system, which he trusts may eventually be found as useful in practice, as he feels certain it is correct in theory...

Proceedings.] DISCUSSION ON CORROSION OF MARINE BOILERS. 145 gether confirmed in practice, because i t wasoftensaid, and he The Author. believed the statement was borne out by experience, that wrought iron, which was less homogeneous than steel, stood better than the latber; so thatif it was reallythe homogeneous materialthat stood the better, steel ought to be better than wrought iron ; but as wrought iron did stand better than steel in most cases i t rather complicated thematter. However, thenature of thesteel used for making boilers was a subject to which much careful study had been devoted, and he thoughta large amount of attention had been given to that particular point, with a view to get as homogeneous a steel as possible...

114 DISUUSSION ON CORROSION OF MARINE BOILERS. CMinutes of Discussion. l'he President. The PRESIDENT thought the members would agree with him that a hearty vote of thanks was due to the Author for his important Paper, which raised a subject great importanceboth to the Navy of and to the mercantilemarine. Mr. List. Mr. J. LIST said the Paper was certainly an important one. It wasfound in marineboilers of thewater-tanktype fed from Burfacecondensers that the severe formofcorrosion knownas '(pitting " could only be prevented by the continuous expenditure of an amount of zinc, the cost of which was a not unimportant item in working-expenses...

32 similar substances are in contact, as when gate of one kind of wood a is fastened pins with of another wood, some action tending to loosen the pins prematurely takes place betwixt them. " On TubingtheBoilers Buck, M. Inst. C. E. of Locomotive Engines."ByGeorge l'ubing for Boilers. In this communication, the author has attempted to determine t h e diameter of the tubes of the boiler of a locomotive engine, SO that the effect in the generation of steam may be a maximum...

Papers.] WaBB OI? COPPER LOCOXOTIvE-BOILER TUBES. 401 (Paper No. 3423.) `` Copper Locomotive-Boiler Tubes." By FRABCIS WILLIAN. WEBB, Vice-President Inst. C.E. HAVIHG recently concluded an investigation made with the object of determining the composition of copper tubes most suitable for use in locomotive-boilers, the Author has pleasure i n presenting the result, which, he feels sure, will be interesting, and doubtlessuseful, to engineersengaged in locomotive-work. As mentioned in his Paper on "Locomotive Fire-box Stays," the fire-box stays of the locomotive-boilers on the London and North Western Railway are of copper; the inner casing of the fire-box and the tubes generally are also of that metal, which is found to be more economical than steel, in respect of both durability and evaporative power...

212 OTEER SELECTED PAPERS. Xo. 1,486.-`` The Evaporative Performance of Steam Boilers." By D. KINNEAR CLARK, Inst. C.E. M. N R . GRAHAM'S ESPERIXENTS, 1858. Mr. John Grahanl published, in 1858,' an account of his experiments.on the proportional evaporative value of the heatingsurfaces of boilers. 1st Series.-Four open tin pans, 12 inchessquare, in a row, were set in brickwork. From a grate, 1 2 inchessquare, placed directly under the first pan, and 9 inches below it, a flash-flue, 3 inches deep, conducted the gaseous products undertheother pans towards a chimney...