EN 12953-6 / Required nominal volume tank

[MoZBy]

Hello guys. In accordance with the EN 12953-6 standard, we must provide an appropriate number of tanks in the event of thermal expansion of the heating medium. Various manufacturers of pump solutions for pressure stabilization systems use the conversion factor from the B.23 standard (n = 3.9 × 10- 4 t2 + 0.31) for temperatures above 120'C. Further calculations are quite obvious and determine the required nominal volume of the tanks. Pumping systems have additional, smaller tanks to prevent the pumps from turning on too quickly in response to pressure changes in the installation (temperature increase). Now the question is - if I have the required tank capacity of 10m3, can I "transfer" part of this volume to a smaller vessel to reduce the required Required nominal volume? The small tank compensates for part of the charge, which means that the pumps run even less often, and the rest of the medium will go to the main tanks if the smaller tank uses its maximum capacity. Is this consideration correct in relation to the EN 12953-6 standard? Thanks for replay