By Chad Edmonson
Properly sized expansion tanks (standard or bladder/diaphragm) are critical to a successful air management in a hydronic system.
Every expansion tank manufacturer has a written form that provides the steps and calculations for sizing an expansion tank. Most, if not all, have developed software that does the work for you. Bell & Gossett has a great one, ESP-Plus which can be downloaded here. But regardless of whether you use software or charts and longhand calculations to size an expansion tank, there are a few pieces of information you’re going to have to have either way. These key values are: