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Steel Expansion tank BTU Ratings

I am the service supervisor for a heating company outside of Philadelphia. We have a customer with a 4 story house. Cast Iron radiators, and a Columbia Steel FT6150C boiler. Customer had relief valve problems during the previous heating system. Several years ago the boiler was replaced with the Columbia but the expansion tank was not. Checking the extrol size chart is states that it would need a ET-90 extrol tank. So now I am attempting to find a chart for the steel tank to have as much information when I review with customer and make the correct change. If you are aware of a web site which has this information or can post it here please do so. Thanks, Mike

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