FY2022
Contact Tim Wilkey Department PUBLIC WORKS
V3168
Project #
Project Name Replace Heat Exchanger
Type Multi-Phase
Useful Life 20 years
GRANTEE NONE
PLAN None
Category Wastewater Treatment
MATCH % NONE
TIF DISTRICT None
Priority Essential (2)
Description Replace Heat Exchanger (HEX) 8501 (Spiral) with Stainless Steel version of same design. City staff will install. Total Project Cost: $1,050,000
Status Active
Justification HEX 8501 is approximately 20 years old and is near the end if it's useful design life. This HEX is carbon steel and does have internal corrosion which encourages Struvite formation. This leads to more blockages and requires more frequent cleaning to remove the struvite. The replacement HX is a stainless steel version and will give 20+ years of service without the corrosion issues. HEX 8501/8502 pre-heats the incoming sludges as they enter the thermophilic digesters, and are critical to initiating the digestion process. The two HEX that perform this function are considered "duty" and "standby". If these HEX are not operational, we would run the risk of not meeting our requirements per the EPA 503 rules for sludge digestion and disposal.
Expenditures CONSTRUCTION
Total
2021
2022
2023
2024
2025
150,000
900,000
1,050,000
150,000
900,000
1,050,000
Total
Funding Sources WASTEWATER FUND
Total
2021
2022
2023
2024
2025
150,000
900,000
1,050,000
150,000
900,000
1,050,000
Total
Budget Impact/Other These projects should lower operating expenditures through the replacement of aging infrastructure. The estimated annual savings is less than $10,000 per year.
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