Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . The requirements for this material will be about as follows: The tensile strength of the through braces will not be lessthan 66,000 pounds per square inch, and an elongation in 8inches of not less than 22 per cent. The bending test will be made on a piece K inch square cutfrom a bar, and must stand bending double, cold, to an innerdiameter of i^ inches, without showing cracks or flaws. The two stays to the crow feet over the mid
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . The requirements for this material will be about as follows: The tensile strength of the through braces will not be lessthan 66,000 pounds per square inch, and an elongation in 8inches of not less than 22 per cent. The bending test will be made on a piece K inch square cutfrom a bar, and must stand bending double, cold, to an innerdiameter of i^ inches, without showing cracks or flaws. The two stays to the crow feet over the middle furnace areto be of iron with a jaw welded to one end for a pin to crow requirements for these angles will be about the same as thatfor the screw stay material: 2—pieces angle 31^^ x 5 x i^ x 56 long. •? 3J/2 X 5 X 5/8 X 51 3^ X 5 X Vs X 75 3^ X 5 X H X 58 3 X 3 X H X 62 3 X 3 X H X 30 • 3 X 4 X ^ X 30 It is customary for the boiler maker to make the small wash-ers, crow feet, etc., and to have patterns for manhole and hand-hole plates, dogs, etc., if they are to be castings. The next to 2—2—2—2— 4—4— HOW TO LAY OUT A SCOTCH BOILER 119. esWHId a uz MH[I. O Ku HOUU3 UU« \° I20 LAYING OUT FOR BOILER MAKERS make up, is the list or order for tlie tubes. These are to be made of low carbon mild steel and uniform in quality and grade. ^ They will be of seamless, cold-drawn steel, 2^ inches out- The requirements for these tubes are about as follows:The tubes must be free from surface defects, generally, andof uniform gauge all around. The material must be of such a grade that a tube will stand
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
