HomeMy WebLinkAbout~Master - procure the services of Babcock Power Services of Marlborough Massachusetts, in the amount of $69,300 to perform the Unit 7 Attemperator Spay Flow Study RESOLUTION NO. 22-493
RESOLUTION TO PROCURE THE SERVICES OF BABCOCK POWER SERVICES
OF MARLBOROUGH, MASSACHUSETTS, TO PERFORM THE UNIT 7
ATTEMPERATOR SPAY FLOW STUDY
FOR THE CITY OF AMES,IOWA
WHEREAS, the City's Power Plant operates two natural gas-fired boilers,which generate
steam to produce electricity. These are referred to as Unit 7 and Unit 8. The boilers consist of tubes
containing water; tubes in the lower part of the boiler are referred to as "waterwall"tubes, and the
upper section of the boiler is referred to as the "superheat"; and,
WHEREAS, in 2019, the City contracted and commenced work on a project to repair the
Unit 7 boiler by replacing the lower waterwalls and the pendant superheater with new boiler tubes
clad with a special alloy (Inconel 622), highly resistant to corrosion. The lower waterwall tubes
were replaced on all four sides of the boiler from just above the burner level down to the bottom
of the boiler, a length of approximately 45 feet. The project also replaced all the tubes in the
superheater with new boiler tubes, also clad with Inconel 622; and,
WHEREAS, under certain operating conditions, it becomes necessary to spray the tubes
where the steam exits the superheater. Following the completion of the boiler repair project, the
Power Plant staff noticed that when operating Unit 7, the amount of spray attemperation required
to control the outlet temperature of the steam leaving the superheater for the turbine was 200%
greater than prior to the repair project; and,
WHEREAS, the City notified the Contractor of the excessive amount of attemperation
required to control the steam temperature leaving the boiler, and collectively the Contractor and
the City tried to adjust how the boiler was operated to reduce the amount of spray attemperation
to historically normal levels without success; and,
WHEREAS, the City and the Contractor have agreed to the study that is to be performed
by Babcock Power Services,who was deemed to have the experience and the expertise necessary
to perform the study, and have agreed to split the cost of the study 50150. The City's ultimate goal
of the study is to determine the remedy to reduce and return the amount of spray attemperation
required to control the superheater outlet temperature to original design and historical normal
levels, and then have the Contractor be responsible for implementing that remedy.
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Ames, Iowa,
that procuring the services of Babcock Power Services of Marlborough, Massachusetts, in the
amount of$69,300 to perform the Unit 7 Attemperator Spay Flow Study is hereby approved.
ADOPTED THIS 131h day of September, 2022.
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Renee kall, City Clerk John A. Haila, Mayor
Introduced by: Betcher
Seconded by: Junck
Voting aye: Beatty-Hansen, Betcher, Corrieri, Gartin, Junck, Rollins
Voting nay: None Absent: None
Resolution declared adopted and signed by the Mayor this 13th day of September, 2022.