Figure 1-1 Site selection guidelines for a Class III supply point.
Selection Criteria for Equipment. You must also select a site for other equipment in the Class III
supply point. This equipment includes 20,000-gallon collapsible tanks, 50,000-gallon collapsible tanks, and
500-gallon collapsible drums.
The site you choose for the 20,000-gallon collapsible tanks should be similar to that for the 10,000-gallon
collapsible tanks. Choose a site that is nearly level with a gentle slope toward the manifold end of the tank.
Space the tanks about 150 feet apart. Build a fire wall around each tank. Make it large enough to hold the
contents of the tank and 1 foot of freeboard. To do this, build the fire wall 4 feet high and 18 inches wide at
the top, and make the inside dimensions of the fire wall 35 feet long and 31 feet wide. Maintain a distance of
4 feet from the edge of the tank to the base of the fire wall. If an engineer unit prepares the site, you must
ensure they follow these design factors. Place the discharge pumps at a level lower than the tanks to aid
Choose a site for the 50,000-gallon collapsible tanks that is similar to that for the 10,000- and 20,000-
gallon collapsible tanks. Build the fire wall 4 feet high and 18 inches wide at the top, and make the inside
dimensions of the fire wall 73 feet long and 33 feet wide. Place the discharge pumps at a level lower than
the tanks to aid pump suction.
For the 500-gallon collapsible drums, select a firm, level site near the source of supply. Select a site that
allows drums to be easily lined up for filling and rolled away after filling.