CheckMate Valve Integral to Large CSO Outfall

1050mm_checkmate_valve_cso_outfall

CheckMate Valve Integral to Large CSO Outfall

In order to mitigate flooding in Glasthule Village from sewer overflows during storm events, a CSO outfall to the sea was constructed as an interim measure. A CheckMate non-return valve was identified as the best product for installation on the CSO outfall pipe to prevent backflow from the sea entering the sewer system. The low headloss of the CheckMate valve meant that a pumped solution was not necessary.

Project Details
Client: Dun Laoghaire-Rathdown County Council
Consulting Engineer: RPS
Contractor: MJS Civil Engineering
Design Details: 1050mm CheckMate valve with max. headloss 450mm at 4m3/s flow

Glasthule Village in Dun Laoghaire, Dublin was identified as being at risk from flooding during severe storm events and the interim measure adopted was an overflow structure on the large combined sewer system. This work was conducted on behalf of the Dun Laoghaire-Rathdown County Council (DLRCC) and completed in 2011.

The project involved the provision of a high level emergency overflow connecting an existing access manhole on the sewer tunnel to West Pier Pumping Station to the existing sea wall adjacent to the former Dun Laoghaire Baths site. The overflow system included an adjustable weir, a depth monitor linked to the DLRCC telemetry system, a non-return valve and associated pipework.

The non-return valve chosen was a CheckMate rubber inline valve from Tideflex. The low headloss of this valve meant that a pumped solution was not needed. A 1050mm CheckMate valve was manufactured and installed in 2010 and has been in operation with no issues since then. The CheckMate valve was lifted into place and inserted into the 1050mm overflow pipe and fixed in place using existing equipment on site - no specialist equipment or staff necessary.

Plan of New Overflow Chamber

Plan of New Overflow Chamber

Section of New Overflow Arrangement

Section of New Overflow Arrangement

Outfall location

Checkmate valve delivery

CheckMate valve lifted into manhole

CheckMate valve manoeuvred into place

CheckMate valve inserted into pipe with steady pressure

CheckMate valve in pipe ready for final push