We need to make sure customers install and maintain backflow prevention devices where they are required.

AMTROLexpansion tank Sizingpdf

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Hydronicexpansion tank sizingcalculator

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Chilledwater expansion tank sizing

The value V, is the result, measured in liters, of the calculation. For a correct dimensioning, choose the smallest expansion vessel.

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The Pi pressure is equal to the maximum system pressure, that is the maximum temperature reached by the system, preventively calculated 50 °C.

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Expansion tank sizingChart

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Varem S.p.a. Tel: +39 049 8840322 Fax: +39 049 8841399 Email: varem@varem.com FAQFor frequently asked questions, consult FAQ Go to the FAQ

The value of the air pressure in the tank balances the water pressure. Considering the air compression isotherm, the pV product is constant. Introducing water in the tank, the air volume decreases, increasing pressure. See the table below for an example of constant pV ratio in a 100 lts. tank with an absolute precharge pressure of 2 bar (constant pV ratio: 200).

The value V, is the result, measured in liters, of the calculation. For a correct dimensioning, choose the smallest expansion vessel.

Pia Absolute precharge pressure of the expansion vessel, sum of the relative precharge value of the vessel (determined by the system) and the air pressure:

AMTROLExpansion Tank SizingChart

How to calculateexpansion tanksize for chilledwatersystem

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The International Standard of Measurements uses the pascal unit (Pa). 1 bar = 10^5 Pa. The water content of a tank is always less than the nominal capacity of the tank. Upon request, Varem provides a CD-ROM with an application of dimensioning. Find further technical information on the technical sheets of the products.

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Expansion tank sizingcalculator

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e Water dilation coefficient, the maximum difference between the calibration temperature of the boiler thermostat and the water temperature with the system switched off. See table below for sample.

Expansion tank sizingrule of thumb

The Pf pressure is the value reached at minimum temperature, about 4 °C (in case of lower temperature, please check for possible modifications to the equation).

C water volume inside the system including boiler, pipes and heating bodies considering a 15-20% safe weighting. By and large, C is between 10 and 20 l each 1000 Ikcal/h (1.163 kW) of the heating power of the boiler.

The valve shutter is activated by the steam under pressure. It opens overcoming the force applied to the shutter by a spring. At preset pressure, the security valve starts to open, and at the nominal discharging pressure (usually more than 10% of the calibration) it is completely open. The valve closes at 80% of the preset value. This device guarantees the external discharging of the steam that could form within the system after exceeding of the preset thermostatic values.