Practical Design of Marine Single- and Double-ended Boilers Including Uptakes, Etc |
Common terms and phrases
30 tons allow arranged back plate back tube plate bolts breast stays butt straps caulking Circum circumferentially combustion chamber combustion-chamber compensating plate compressive stress corrugation cross seam double-ended boilers doubler draught boilers extra feet 3 inches fire-bars firebox fitted flanged forced draught front and back front end front tube plate funnel furnace mouth gases girders grate area hanging stays heating surface heel Howden's inch thick inches diameter inner inside joint lap jointed length longitudinal Manhole natural draught nest of tubes nuts percentage strength plate at wide pressure radius rivet holes row of stays screwed stays shell plate side single-ended smokebox Square Inches supported stay tubes steam steam-space stays steel superheater SURFACE IN SQUARE Survey Rules tensile strength thickness of plate threads per inch tons per square top end plate uptake usually water-tube boilers weight wide space Wide Water Space wrapper plate
Popular passages
Page 2 - The Board of Trade consider that boilers well constructed, well designed, and made of good material should have an advantage in the matter of working pressure over boilers inferior in any of the above respects, as unless this is done the superior boiler is placed at a disadvantage, and good workmanship and material will be discouraged. They have therefore caused the following rules to be prepared...
Page 4 - For girder plates the tensile breaking strength is to be between the limits of 28 and 35 tons per square inch. For plates intended for flanging and...
Page 49 - In cases where longitudinal stays are made with enlarged ends and the body of the stay is smaller in diameter than at the bottom of the thread, and in cases where coarser threads than 6 per inch are used the working pressure is to be calculated from the following formula...
Page 55 - ... of the stay tubes supporting any portions of the plate (being the sum of the four sides of the quadrilateral divided by 4...
Page 15 - THE crank -shaft forging is made from mild steel having a tensile strength of from 28 to 32 tons per square inch, with an elongation of 30 per cent.
Page 2 - Wrought iron is well adapted for use in boiler construction, as it is strong, tough and fibrous, and combines high tensile strength with ductility and freedom from brittleness. When the properties mentioned are well combined, wrought iron will resist strains due to unequal expansion. Boiler fastenings, stays and other parts made by welding are sometimes made of wrought iron. It is customary to consider that a bar loses about one-quarter of its...
Page 4 - ... should be selected by the Surveyor from the bulk, and should be subjected to the following tests : — (a) The rivet shanks to be bent cold and hammered' until the two parts of the shank touch, without fracture on the outside of the bend. (b) The rivet heads to be flattened, while hot, until their diameter is two and a half times the diameter of the shank, without cracking at the edges. A few check tensile tests of shell rivets should also be made when the Surveyor considers it necessary.
Page 44 - T (iii) Percentage of combined strength of the plate at the inner row of rivet holes and of the rivets in the outer row _ 100 (p — ¿d) . 100 (S* xa XG) -1P S.
Page 4 - Hydraulic riveting machines are the best, hecatise the steady pressure produced on the end of the rivet staves it up better, and causes it to fill the hole more completely than is likely to be the case with steam or hand riveting, where the action is percussive. 287. Caulking and Fullering. — However well a joint may be riveted up, it will seldom be perfectly steam-tight. To make the joint steamtight, the edges of the plates and the heads of the rivets are burred down with a caulking tool, as shown...
Page 57 - For portions of plate where the stays are irregularly pitched d2 is to be used instead of a2 + b2, d being the diameter of the largest circle which can be drawn passing through not less than three points of support, viz., the centres of stays or the commencement of the curvature of flanging whichever is applicable. In this case C is t° be taken as the mean of the values appropriate for the points of support.