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Estimating Methods, Variability, and Sampling for Drop-Test Data

Procedures (Continued)

Weighing and Calculating

During the weighing process, the weight and coordinates of each cup are entered into a computer. The weight of the empty plastic cup and lid is subtracted from the total weight and the weight of the liquid in grams is converted to gallons per hundred square feet (gpc) using the density of the liquid. For retardant with a density of 1.095 grams/cubic centimeter, the equation is:

where x is the amount of retardant in the cup in grams.

Figure 4 is an example of the computer output after drop samples have been weighed. Cups that were not picked up are assumed to be 0 gpc. This value is included in the array. This array is used to create a map of the drop (figure 5).

Figure 4—Data array with cup position indicated in columns 1 and 2 and gpc values in column 3.	Figure 5—A contour plot showing observed gpc values.

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