The Shand Untreated Water Makeup System

1778 WordsMay 17, 20178 Pages
The purpose of the Shand Untreated Water Makeup System (KI) is to supply raw, non-potable water to Shand Power Station. The majority of water comes from Rafferty Dam, with a smaller amount that comes from the wetlands source. The water is gathered in the Shand raw water pond, where it can be distributed to several areas for on-site usage. The largest consumers of this water are the cooling towers. SaskPower has a contract with the City of Estevan to accept sewage effluent until Shand’s end of life. It achieves this by pumping the sewage effluent into the constructed wetlands and eventually into the main untreated water line to be delivered to the Shand raw water pond. Short-Term Recommendations Short-term recommendations are…show more content…
If a replacement of ‘A’ pump is justified (due to operating conditions or inspection findings) prior to 2022, it is recommended to proceed with replacement. If not replaced prior to 2022, it is recommended to replace ‘A’ Rafferty pump in 2022. It is recommended that the Rafferty outlet piping and valves be replaced in 2022. This includes all piping and valves up to the enclosure conduit. The recirculation valves are excluded from replacement (as they will have been replaced in 2017). The major valves should be re-assessed prior to 2022 to confirm which require replacement. It is recommended to isolate the current untreated makeup water line from the previously used and currently unmaintained Estevan aquifer piping in order to maintain system integrity. The line would be exposed, capped, and backfilled. Purpose This purpose of this report is to assess the Shand Untreated Water Makeup System (KI) in two ways: • To determine what work is required to operate safely and reliably until 2022 • To determine what work is required in 2022 to extend the life of the system to 2030 / 2042 2 General/Background Information The purpose of the Shand Untreated Water Makeup System (KI) is to supply raw, non-potable water to Shand Power Station. The water is gathered in the Shand raw water pond, where it can be distributed to several areas for on-site usage. The largest consumers of this water are the cooling towers. The

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