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Home / Calculators / Hydronic Closed Expansion Tank Sizing
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Hydronic Closed Expansion Tank Sizing

Calculate required diaphragm expansion tank volume for closed chilled and hot water hydronic loops to prevent relief discharge.

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ASME Tank Acceptance Volume
128 Liters Tank
Expansion Volume: 38.2 Liters
Prevents high-pressure safety valve popping during thermal heating/cooling cycles.
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Governing Formula:
Vt = V_system ร— [(v2/v1) - 1 - 3ฮฑฮ”T] / [1 - (P_initial / P_relief)]; ASME Section VIII criteria
Pune Field Notes & Environmental Standards:

Essential for preventing pressure relief valve discharge in closed-loop chilled water and boiler systems.

Technical Engineering Guide & Field Diagnostic Practices

Thermal expansion of water within closed hydronic circuits must be absorbed by a properly charged diaphragm or bladder tank to prevent catastrophic pipe stress and PRV lift.

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