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NORA Oilheat Technicians Manual

Externally coated ob-round—This corrosion resistant tank has a polyethylene coating on the outside of a standard obround tank, Figure 3-9. The coating protects the tank from external corrosion and serves as release barrier should the tank corrode internally. Fiberglass—This corrosion proof tank is available in both single and double wall models and in 240 and 300-gallon capacities. The double wall unit is a tank within a tank— if the inner tank leaks, the outer tank prevents a release of oil, Figure 3-10. 3-8 Oil Tanks and Piping Figure 3-7: Ob-round tank Type Once you have determined the proper size and location to install a new tank, your customer can choose the type of tank based on price, warranty and level of spill protection. There are many choices: Above ground tanks Ob-round—The 275- gallon “Ob-round” steel tank, Figure 3-7, has been the standard for decades and is the most common tank. Ob-round tanks are currently available in a number of sizes from slightly over 100 gallons to 330 gallons. Newer ob-round tanks have the oil drawn from the bottom of the tank to reduce the amount of condensation and sludge build-up in the tank. Figure 3-8. Cylindrical—These tanks are often found in mobile homes and in places where space considerations made it easier to install and service than an ob-round tank. They are typically available in sizes ranging from 160 to 320 gallons. Figure 3-8: Bottom tap Figure 3-9: Externally coated tank Figure 3-10: Fiberglass tank Chapter 3 Oil Tanks and Piping


NORA Oilheat Technicians Manual
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