Title
Consider and take action on a resolution authorizing an agreement with Howden-Roots LLC for three replacement aeration blowers for the Southwest Water Reclamation Facility Project (WW1802) in an amount not to exceed $452,567 (Director of Public Works)
Background:
Approval of this resolution will authorize the sole source pre-purchase of three Howden 5SV-GK200 single stage integrally geared, centrifugal compressors (Blower) to replace the failing aeration blowers at the Southwest Water Reclamation Facility.
On March 27, 2018 City Council approved a professional services agreement with CDM-Smith for the accelerated design and construction support services for the blower replacement project. As part of the early design activity, it was determined that the direct purchase of the aeration equipment by the City from the blower manufacturer would lessen the lead time for delivery by as much as six-months. The need to fast-track the design and construction is driven by urgent need to restore aeration redundancy that is currently compromised by the sequence of events associated with the blower failures. The pre-purchase allows the manufacturer to begin the build process while the design and associated submittal review move forward. The estimated time line for in-service availability is May 2019 versus November 2019 if the standard Design, Bid, Build, (DBB) process was utilized without the pre-purchase. The construction phase will be competitively bid at completion of the design process. Further detail is available in attached CDM-Smith Pre-Procurement memo.
In December 2015, the three (3) Siemens SC-50 Turbo Blowers that were selected to serve SWWRF began progressively failing. All three machines experienced similar failures by Summer of 2017 (Blower #2 Nov 2015 @ 9,627 hours; Blower #3 Sept 2016 @ 11,625 hours; and Blower #1 May 2017 @ 11,812 hours of operation, respectively). General cause of failure was found to be air bearing failure from ingesting particul...
Click here for full text