7.8103.4 Rooftop Potable Water Storage Tanks ("Standpipe" or "Gravity" Tanks)

Topic: 
Water Heating
Subtopic: 
Maintenance/Inspection
Desired Outcome: 
Ensure rooftop potable water storage tanks (seen in older high-rise buildings, typically made of wood, used to provide potable cold water to building via gravity, and filled by ground floor pumps) are properly maintained
TitleSpecification(s)Objective(s)
7.8103.4a
Cleaning

Drain, clean, disinfect, and flush storage tank with chlorine solution or equivalent no less than annually

Ensure water quality

Maintain system durability

7.8103.4b
Tanks floats

Inspect tank floats annually, and lubricate and repair, as needed

Maintain proper operation of float and ground floor pumps

7.8103.4c
Tank sealing

Repair and caulk any tank cracks and holes

Carefully tighten vertical slats, as necessary

Fill and pressure test after completion of sealing

Prevent water leakage

Maintain water quality and prevent contamination

Ensure system durability

7.8103.4d
Freeze protection

If large water mass and regular water flow is inadequate for freeze protection in cold climates, minimize freezing by implementing tank insulation, electric resistance heating, or hydronic/steam coils, as needed

Prevent water from freezing