Disinfection of Pipelines - Disinfection of Pipelines and Storage Facilities Field Guide - page 33

Use Tables 3-7a & b and 3-8a & b to determine the amount of
calcium hypochlorite granules or the number of tablets needed to
disinfect the length of pipeline. Table 3-7a lists the amount (by
weight) of calcium hypochlorite granules needed to achieve a
25 mg/L dosage for each 500 ft of pipeline. Weights are given in
ounces and grams.
Often facilities are not available to weigh out the amount of
chemical needed for the job. Kitchen measures are then handy
for this purpose. Teaspoons, -cup, and 1-cup measures

are readily available and Table 3-7b lists the approximate num-
ber of these measures needed. From the table, about 1 cup is
needed for each 500-ft length of 8-in. diameter pipe. A plastic
one-cup kitchen measure is all you need in the field to make this
measurement.
Tables 3-8a & b list the number of 5-gram tablets needed for
various pipe lengths, in both US and SI units. So, from Table 3-8a,
a single tablet is needed for an 18-ft length of 6-in. diameter pipe.
Similarly, from Table 3-8b, two tablets are required for a 6-m
length of 200-mm diameter pipe.
If this method is used, great care must be taken to ensure
that the pipeline is clean, dry, and free of dirt, debris, and other
contamination. Fill the pipeline slowly to ensure that the gran-
ules are not moved to one end of the pipeline and to allow time
for the tablets to dissolve.

¹₄ -cup, ¹₂

Chlorination Steps and Precautions.
1. Place calcium hypochlorite granules or tablets at the
upstream end of the first section of pipe, at the end of
each branch main, and at 500-ft intervals (Tables 3-7a, b
and 3-8a, b).
2. Use NSF/ANSI Standard 61 certified adhesive to attach
tablets inside and at the top of each section of the main
(Figure 3-12).

Ops T ip Tablets aren't generally used if more than five need to be

used in one place. Use a combination of tablets and
granules in this case.