Ames Ionwave #2026-099 Addendum 1

Ames Substation Transformer Maintenance and PCORE Bushing Replacement

The City of Ames Electric Services Department is seeking a contractor for specialized substation transformer maintenance and repair services at its Ames, Iowa facility. - Government Buyer: - City of Ames Electric Services Department (with involvement from the Finance Department / Purchasing Division) - OEMs and Vendors: - PCORE (manufacturer of replacement bushings, part numbers PRC350C0412A and PRC350F0412A) - Siemens-Allis (OEM of the DA6T2 Load Tap Changer, model TLH-21) - General Electric (GE) (original manufacturer of Type U bushings being replaced) - Products/Services Requested: - Installation of three 69kV U Type bushings (PCORE, part numbers PRC350C0412A and PRC350F0412A; bushings provided by the City) - DA6T2 Load Tap Changer (LTC) repair and maintenance (Siemens-Allis TLH-21 model) - Complete regasketing of all transformer components, including LTC and CT feed-thru - Oil processing and reuse, including hot oil wash for LTC oil - Pre- and post-maintenance transformer testing (turns ratio, power factor, etc.) and submission of test reports - Contractor to provide all labor, additional parts, equipment, scaffolding, and testing - Unique/Notable Requirements: - Contractor must remove LTC for regasketing and reuse processed oil - City provides bushings, LTC parts, LTC oil storage, and crane with operator - Contractor must provide scaffolding and coordinate with City resources - One-year guarantee on materials and workmanship required - All work must comply with City affirmative action and insurance requirements - Priority given to bidders who can meet the specified May-June or September-November work windows

Description

The City of Ames Electric Services Department is soliciting bids for substation transformer maintenance and repair services specifically for DA6T2 Load Tap Changer (LTC) repair and "U" bushing replacement. The work is scheduled to occur during May - June 2026 or September - November 2026. Priority will be given to bidders who can complete the project within the specified timeframe. The City will provide certain parts and equipment such as the 3 - 69kV U Type bushings, LTC oil storage, LTC parts, and a crane with operator. The contractor is responsible for labor, parts, equipment, scaffolding, and oil processing as specified in the scope of work.

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