The sediment pocket volume is added to the foam concentrate quantity for which type of tank?

The sediment pocket volume is added to the foam concentrate quantity for which type of tank?

• A. Atmospheric-type
• B. Pressure-proportioning
• C. Both
• D. Neither

Answer: (A)

In foam-water systems, you must account for any internal spaces that can’t contribute to the usable foam concentrate. The sediment pocket is a feature of atmospheric-type foam concentrate tanks that occupies space inside the tank. Because this pocket reduces the amount of concentrate that can be drawn for discharge, its volume is added to the foam concentrate quantity when sizing and charging atmospheric-type tanks. This ensures there is enough concentrate available to meet the design requirements during operation. Pressure-proportioning tanks are not designed with this same consideration in the same way, so the sediment pocket volume isn’t added to the concentrate quantity for those systems.

In foam-water systems, you must account for any internal spaces that can’t contribute to the usable foam concentrate. The sediment pocket is a feature of atmospheric-type foam concentrate tanks that occupies space inside the tank. Because this pocket reduces the amount of concentrate that can be drawn for discharge, its volume is added to the foam concentrate quantity when sizing and charging atmospheric-type tanks. This ensures there is enough concentrate available to meet the design requirements during operation. Pressure-proportioning tanks are not designed with this same consideration in the same way, so the sediment pocket volume isn’t added to the concentrate quantity for those systems.