Let’s now practice area calculations for a pipe. In the example below we have a pipe with a height of 9 feet 6 inches, and an outer diameter of 2 feet and six inches. Note that the diameter dimension is to the outside of the pipe and not the inside. Using the formula for calculating the area of a hollow cylinder we would multiply pie, by the height value, and the outer diameter value. In the case of our pipe below, that would mean multiplying three point one four, times two point five feet, times 9.33 feet, for a total area of 73.24 squared feet. Note that the height and outer diameter dimension was given in feet-inches and were converted to feet in decimals in order to perform the calculations. We learned how to do this conversions on an earlier lesson and we can see it being applied here. When dealing with calculating the weight of a hollow pipe, it is common practice to first calculate the area of the pipe as a sheet of material. Once you have the area, you multiply it by the density of the material that corresponds to the thickness in question. Further lessons will go into more detail about this process.
NOTE: When dealing with calculating the weight of a hollow pipe, it is common practice to first calculate the area of the pipe as a sheet of material(shown above). Once you have the area you multiply that by the density of the material corresponding to the thickness of the material ( i.e., weight chart). Further lessons will go into more detail.