441 OF ENGINEERING FORMULÆ.
Iron-works (in Wales). Tons.
Yield of each puddling furnace per week 20 to 25
Ditto of balling furnace for rails .. 70 to 80
Ditto of balling- furnace for small bars 95 to 45
Ditto of refining ditto .......... 130 to 150
Ditto of blast ................... 350 to 400
Ditto of puddling rolls ..........20 furnaces.
Ditto of rail train .......... 500 to 600 tons.
Temperature of hot blast .. 600° to 1200° Fahr,
Density of blast for blast).,, , o „ . ,
furnace .....................to 8 Ibs.sq, meh.
Ditto for refining furnace .. 3J to 8 lbs. „
Number of revolutions of|)n, ,
puddling rolls.........J40 to 60 per minute.
Ditto ditto rail rolls .. 100 „
Velocity of rail saws, 4000 to 5000 feet per minute
Power required for Different Processes.
Blast furnace, each .. 60 HP indicated.
Refining ditto .. .. 26 HP
Puddling rolls with squeezer and shears } 80 HP
Rail rolling train .. 250 HP
Small bar train 60 HP
Double rail saw 12 HP
Straightening process .. .. 7 HP M
Spited of Rolls, &c.
Armour plate, 32 ins. cliam............ 150 feet per minute.
Boilerplate 28 ,, .......... 300 „ ’
Tire rolls.......................... 300 ”
Roll mills and large T & L 'ron rolls 350 ,,
Merchant bar rolls, 15" diam. .. .. 400 ”
Small merchant bar rolls, 9" diam. .. 450 ,, ”
Nail rod rolls .. i. .. ........... 500 ,, ’’
Wire rolls, 8" diam............... ,, 750 „