Tank Sizing

Select a type of tank to calculate the model needed for your installation:

HVAC Expansion
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HVAC Expansion Tank

Expansion tanks are required in a closed loop heating or chilled water HVAC system to absorb the expanding fluid and limit the pressure within a heating or cooling system.

A properly sized tank will accommodate the change in system fluid volume during heating or cooling cycle without allowing the system to exceed critical pressure relief valve limits.
Compression Conversion
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Convert a Compression Tank

Convert a compression style expansion tank into a bladder or diaphragm expansion tank.
Domestic Hot Water
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Domestic Hot Water Tank

Thermal expansion tanks are designed for pressure control in a potable water system. The building's water heater or water heating system typically creates thermally expanded water.

A properly sized thermal expansion tank will accommodate this additional volume of water created through expansion during the heating cycle, and control the system pressure increases, keeping pressures from reaching critical safety relief limits.
Well & Pressure Booster
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Well & Pressure Booster Tank

Hydro-pneumatic tanks are vessels that store water for a municipal well system or pressure boosting station.

Properly sized, these tanks provide drawdown water used to supply water for small demand loads, keeping the pumps off until needed. Additionally, these tanks can be applied to reduce harmful surge and water hammer pressure spikes.
Buffer
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Buffer Tank

Buffer tanks are required for systems with insufficient water volume capacity to eliminate short cycling of chiller or boiler components, poor temperature control, and erratic system operation.

A properly sized tank adds the necessary water volume to "buffer" the system to dampen fast transitions and eliminate short cycling.
Flash
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Flash Tank

Flash tanks are designed for systems that require flashing of high pressure condensate into steam for low pressure heating supply mains, and to reduce the cool low pressure steam before it is returned to the boiler, condensate receiver, or discharged into sewer.


Critical Sizing - HVAC Expansion

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Low Temperature

Lowest temperature the System fluid will reach.

Boiler Heating System

Temperature at time of boiler startup. Typically 70°F.

Chilled Water System

Lowest system operating temperature.
For chilled water, typically 35 °F - 45 °F.
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Max Temperature

Maximum temperature the System fluid will reach.

Boiler Heating System

Maximum boiler operating temperature - Typically 160°F - 220°F

Chilled Water System

Hot summer ambient Temperature.
Typically 90°F - 110°F

 

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Critical Sizing - Convert A Compression Tank

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Tank Volume

Compression tank volume measured in gallons.
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Minimum System Pressure

Minimum hydronic system pressure needed to push water to the highest point with additional 5 PSIG of pressure. This is the pressure set by the system's pressure reducing valve.

 

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Select volume calculation method:

 

System Volume:

 

 

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Select volume calculation method:

 

System Volume:

 

Select volume calculation method:

 

System Volume:

 

Initial Pressure Estimator

System’s automatic fill valve setting. Estimate based on building height above expansion tank installation.

 

Initial Pressure:

 

Initial Pressure Estimator

 

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Final Pressure Estimator

Typically 20-40 psi above minimum/initial system pressure.

 

Final Pressure:

 

Final Pressure Estimator

 

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Critical Sizing - Domestic Hot Water

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Volume

Total volume of hot water storage tank(s) and other system components, including the building's recirculation loop.
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Initial Temperature

Incoming temperature of water supply.

Typically around 55°F
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Final Temperature

Maximum temperature the System fluid will reach.

Residential Hot Water

110°F - 130°F

Commercial Hot Water

120°F - 180°F.
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Initial Pressure

Incoming water supply pressure to water heater.
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Final Pressure

Maximum desired water Pressure.

Typically 25-40 PSI more than initial pressure.

 

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Critical Sizing - Well & Pressure Booster

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Cut-in / Cut-out

Cut-in: The pressure at which the pump turns on.

Cut-out: The pressure at which the pump turns off.

A pressure switch is typically used to control the pump between these pressures.
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Cut-in / Cut-out

Cut-in: The pressure at which the pump turns on.

Cut-out: The pressure at which the pump turns off.

A pressure switch is typically used to control the pump between these pressures.

 

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Critical Sizing - Buffer

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Total Chiller Capacity

Total capacity output of the water chiller equipment, as measured in tons.
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System Volume Per Ton

Chiller manufacturers recommended between 3 to 6 gallons per ton for typical HVAC systems and 6 to 10 gallons per ton for nominal cooling when temperature accuracy is critical.

 

Calculate

Select volume calculation method:

 

System Volume:

 

 

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Select volume calculation method:

 

System Volume:

 

Draw-down Estimator

Close Consult motor manufacturer.
Rule-of-thumb use:
Up to 3/4 hp - use 1 min.
1-3 hp - use 2 min.
Over 3 hp - use 3 min.
For VHD motors, consult factory'

 

System Volume:

 

Flash Sizing

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Total Flow

Total system flow including liquid and vapor in pounds per hour.
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Inlet Pressure

Initial system pressure entering the tank from the inlet.
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Outlet Pressure

Required system pressure exiting tank from the outlet.

 

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Calculated Critical Sizing

Required Tank Volume

Tank Volume

Bladder: gallons Diaphragm: gallons Compression: gallons

 

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Calculated Critical Sizing

Required Tank Volume

 

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Calculated Critical Sizing

Total Disengaging Area

 

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NLA 35-800L

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NLA 35-800L

Submittals:

 

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Request Quote - Estimate Freight

Estimated Freight Cost

$77.49 USD

 

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