Environmental Engineering Reference
In-Depth Information
½" Pressure Gauge
(2) 1" Hi-Level
Low-Level Control
(2) ½" Gauge
Glass Fittings
Relief Valve
A
¾" Air Inlet
A
B
B
Air Cushion
Usable Water
Reserve Water
Water
Inlet
Drain
Water
Outlet
Manway
Figure 5.15
Hydropneumatic tank.
5.
Hydropneumatic or pressure tanks
are generally used in small water
systems, usually with a well or booster pump. The tank is used to
maintain water pressures in the system and to control the operation
of the well pump or booster pump (
Figure 5.15
).
6.
Surge tanks
are not necessarily storage facilities but are primarily
used to control water hammer or to regulate water flow (
Figure 5.16
).
Protective Coatings and Cathodic Protection
Storing water in a storage tank that is not properly protected and preserved
from corrosion makes little sense and can be highly dangerous. Tanks in
improper physical condition actually degrade the water stored within them.
With any storage tank, any coating or preservative that will be in contact
with potable water must meet the National Sanitation Foundation (NSF)
Standard 61. NSF Standard 61 lists the following types of coatings normally
used in protecting tank surfaces:
Air
Air Chamber
Surge Tank
Clear Well
To
Distribution
System
Pump
Figure 5.16
Surge tank.
