Dairy Establishment Inspection Manual – Chapter 19 Appendices
Appendix 3 Balance Tank Design

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Constant Level Tank

Figure 1 - Constant Level Tank Overview

Image - Constant Level Tank. Description follows.
Description of image - Constant Level Tank

This image shows an overview of a constant level tank. The face of bridge is open. The cover on the tank must be light enough that if the milk reaches the flood level, the cover will be lifted. The air break above the flood level must be at least two times the diameter of the largest return pipeline. Raw milk well at the bottom of the tank must be at a level below the bottom of the tank.

Figure 2 - Constant Level Tank with Elevated Bridge and Vent

Image - Constant Level Tank with Elevated Bridge and Vent. Description follows.
Description of image - Constant Level Tank with Elevated Bridge and Vent

This image shows a constant level tank with an elevated bridge with vent. The bridge is enclosed and the cover must be at least two times the diameter of the largest supply pipeline. The cover of the constant level tank must be light enough that if the milk reaches the flood level, the cover will be lifted. The air break above the flood level must be at least two times the diameter of the largest return pipeline. The size of the vent pipe must be the size of the largest return pipeline or larger. Raw milk well at the bottom of the tank must be at a level below the bottom of the tank.

Figure 3 - Side Overflow (Elbow)

Image - Side Overflow (Elbow). Description follows.
Description of image - Side Overflow (Elbow)

This image shows a consistent level tank with the side overflow (Elbow). The elbow diameter must be at least two times the diameter of the largest supply pipeline. The air break above the flood level must be at least two times the diameter of the largest return pipeline. The size of the vent pipe must be the size of the largest return pipeline or larger. Raw milk well at the bottom of the tank must be at a level below the bottom of the tank.

Figure 4 - Internal Overflow

Image - Internal Overflow. Description follows.
Description of image - Internal Overflow

This image shows a consistent level tank with an internal overflow. The internal overflow tube must be at least two times the diameter of the largest supply pipeline. If the largest dimension of the tank is less than 3 feet, the overflow tube must end at least one diameter of the largest supply pipeline but no less than 4 inches above the floor. If the largest dimension of the tank is greater than 3 feet, the overflow tube must end at least one diameter of the largest supply pipeline but no less than 6 inches above the floor. The air break above the flood level must be at least two times the diameter of the largest return pipeline. The size of the vent pipe must be the size of the largest return pipeline or larger. Raw milk well at the bottom of the tank must be at a level below the bottom of the tank.

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