Ronco Plastics - Marine Water Tanks, RV Water Tank, Auto Detail Tanks, Water Tanks

Welcome to Ronco Plastics!

Measurement Conversions

  • To find circumference of circle -- multiply diameter by 3.1416
  • To find diameter of a circle -- multiply circumference by .31831
  • To find area of a circle -- multiply square of diameter by .7854
  • Area of a rectangle equals length multiplied by breadth
  • Doubling the diameter of a circle increases its area four times
  • To find area of a triangle -- multiply base by 1/2 perpendicular height
  • Area of ellipse equals product of both diameters times .7854
  • Area of a parallelogram equals base times altitude
  • To find side of an inscribed square, multiply diameter by 0.7071 or multiply circumference by 0.2251 or divide circumference by 4.4428
  • Side of an inscribed cube equals radius of sphere times 1.1547
  • To find side of an equal square, multiply diameter by .8862
  • Square. A side multiplied by 1.4142 equals diameter of its circumscribing circle
  • A side multiplied by 4.443 equals the circumference of its circumscribing circle
  • A side multiplied by 1.128 equals diameter of an equal circle
  • A side multiplied by 3.547 equals circumference of an equal circle
  • To find cubic inches in a ball, multiply cube of diameter by .5236
  • To find cubic contents of a cone, multiply area of base by 1/3 the altitude
  • Surface of frustrum of cone or pyramid equals sum of circumference of both ends times 1/2 slant height plus area of both ends
  • Contents of frustrum on cone or pyramid equals multiply area of two ends and get square root. Add the two areas and times 1/3 altitude
  • Doubling the diameter of a pipe increases its capacity four times
  • A gallon of water (U.S. Standard) weighs 8 1/3 lbs. and contains 231 cubic inches
  • A cubic foot of water contains 7 1/2 gallons, 1728 cubic inches, and weighs 62 1/2 lbs
  • To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434
  • Steam rising from water at its boiling point (212 degrees F.) has a pressure equal to the atmosphere (14.7 lbs to the square inch)
  • A standard horse power: The evaporation of 30 lbs of water per hour from a feed water temperature of 100 degrees F. into steam at 70 lbs gauge pressure
  • To find capacity (in U.S. gallons) of tanks of any size, given dimensions of a cylinder in inches, square the diameter, multiply by the length and by .0034
  • To ascertain heating surface in tubular boilers, multiply 2/3 the circumference of boiler by length of boiler in inches and add it to the area of all the tubes