11/22/2017
Roof Drains Secondary
• Sits next to primary roof drain • Starts collecting water if primary drain clogged • Piping runs parallel to primary drain • Piping is above ground ▫ Acts as warning
Grease Interceptors
Roof Drains
• Filters grease from storm water • Three Chamber • Three Filters • First Chamber ▫ Screened orifice ▫ Permanent Pool of Water • Second Chamber ▫ Oil retention • Third Chamber ▫ Collect and Disperse ▫ Storm water drain network ▫ Infiltration Basin
Primary Secondary
Roof Drains Primary
Materials for Piping
• Copper Piping
▫ Ideal but expensive
• Cast Iron
▫ Typically used in construction
Materials for Piping
• Flat Roof slightly pitched around drain • Water collected and directly send to filtering plant • All piping underground • Storm water is never mixed with waste water
• Galvanized Steel
▫ Not preferred due to chemical reaction with zinc
Galvanized Steel
Cast Iron
PVC
Copper
• PVC
▫ Plastics not preferred with sewage
• CPVC and PVBC ▫ Soft material
▫ Compressed fittings
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