I. RECOMMENDATION:
City Manager and Assistant City Manager recommend approving the repair of Water Treatment Plant (WTP) P-15 pump in the amount of $129,103.34
II. BACKGROUND:
P-15 pump is one of the primary pumps that send treated water to the Palmer Reservoir to support peak season demand. This 700 horsepower pump has been in service since 1971.
III. DISCUSSION:
P-15 has been removed and was sent out to be evaluated and the estimate to repair is approximately $130,000. One quote is to repair the motor and the other is for a new pump. The old pump can’t be repaired because they no longer make the parts for it.
In comparison to previous pump and motor repairs this repair is higher due to the replacement of hte bowls (photos attached). The City rebuilt P16 about four (4) years ago and did not need to replace the bowls. The column pipes and shafts and bushings were replaced as well as all wear rings on the impellers and bowls. The costs are very similar between P15 and P16 if you remove the replacement of bowls. The current bowls on P15 are no longer being cast, so the manufacturer will have to use newer smaller bowls for this repair. Because they are a bit smaller, they require seven (7) stages verses the current five (5) stages to achieve the 3340 gallons per minute (gpm) and 612 foot height (fh) needed for the system to use the existing motor. The only piece that the manufacturer is reusing is the pump head to ensure all piping will still match up. Everything else from the bottom of the head down will be new.
IV. ALTERNATIVES:
None, this pump is one of three large horsepower pumps that work in conjunction with the other smaller pumps in the summer months to help meet the City's peak demands.
V. FISCAL IMPACT:
Sufficient funds exist in the Water Enterprise Major Machinery & Equipment fund to accomplish the repair work for the motor and pump at the cost of $129,103.34. Staff has moved priority projects around to accommodate this unexpected expense. |