1. The Overflow Relief Cap - ORC
Anti-infiltration overflow-relief device

2. The Problem…
Infiltration of stormwater into sewer drains has long been recognised as a problem for sewerage treatment infrastructure
This can lead to major impact on the environment when systems fail
As much as 40% of the infiltration is attributed to non conforming overflow relief gullies - ORG’s

3. Conventional ORG Installation ORG allowing water ingress

4. The Solution… Overflow Relief Cap – ORC
The ORC prevents water from entering the sewer at the household connection
The cap is used instead of the open grate that is currently fitted on ORG’s

5. Typical ORC device installation ORC device sealing against
Typical ORC device installation ORC device sealing against water ingress

6. Product Description
Moulded PVC-U anti-infiltration overflow relief device
Nominal size DN100
Upon installation in an overflow (relief) gully, to prevent the infiltration of surface waters to the sewerage and drainage systems and provide for the overflow relief of any surcharge of sewerage and drainage systems

7. Venting How does the ORC work?
The device has an upper chamber designed to allow air to be drawn in during normal conditions
Venting

8. If the area surrounding the ORG becomes inundated with water the float in the ORC chamber will rise blocking further water entry. This prevents water from entering the sewer.
Sealing

9. In the event of a surcharge the ORC will pop out of the pipe allowing effluent to run out (as grates do now)
Overflow

10. Features and Benefits
The cap instead of a grate currently fitted on ORG’s will keep pests and vermin from entering the system at the point
Cap is designed with special vents to allow fixtures connected to it to discharge normally
Reduces sewerage processing costs by preventing rainwater infiltration in the sewerage system

11. Reduces the need for capital expenditure on additional sewerage storage and pumping capacity
Decreases the possibility of untreated sewerage discharges
Minimises the likelihood of Pumping Stations being fined by the EPA for releasing untreated sewerage discharge into the water ways

12. Features and Benefits Builders & Plumbers
Quick and easy to install
The ORC is designed to be installed into the normal ORG
The ORC can be easily retrofitted to an existing ORG

13. Features and Benefits Water Authorities
The cap will prevent water from entering the sewer – saving unnecessary water processing costs
In the event of a surcharge the ORC will pop out of the pipe allowing effluent to run out (as grates do now)
Reduces likelihood of unprocessed discharges of sewerage to outfall during floods

14. Green Credentials
The ORC reduces processing costs by preventing rain water infiltration into the sewerage system
It reduces the need for capital expenditure on additional storage and pumping capacity
It decreased the possibility of untreated sewerage discharges

15. Compliances and Standards
Awarded Watermark for compliance with Australian Technical Specification ATS
Note: The Australian designed Over Relief Cap is patented (patent application PCT/AU2008/ )

16. Product Specifications
Product Code:
D128100DORC
Colour:
White
Weight:
515 grams