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// CODE SNIPPET

1009.2 Closed-Type Expansion Tanks

2015 IMC portion of the 2018 CT State Building Code > 10 Boilers, Water Heaters and Pressure Vessels > 1009 Hot Water Boiler Expansion Tank > 1009.2 Closed-Type Expansion Tanks
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Closed-type expansion tanks shall be installed in accordance with the manufacturer's instructions. Expansion tanks for systems designed to have an operating pressure in excess of 30 psi (207 kPa) shall be constructed and certified in accordance with the ASME Boiler and Pressure Vessel Code. The size of the tank shall be based on the capacity of the hot-water-heating system. The minimum size of the tank shall be determined in accordance with the following equation where all necessary information is known:



For SI:


where:

Vt = Minimum volume of tanks (gallons) (L).
Vs = Volume of system, not including expansion tanks (gallons) (L).
T = Average operating temperature (°F) (°C).
Pa = Atmospheric pressure (psi) (kPa).
Pf = Fill pressure (psi) (kPa).
Po = Maximum operating pressure (psi) (kPa).


Where all necessary information is not known, the minimum size of the tank shall be determined from Table 1009.2.
TABLE 1009.2
CLOSED-TYPE EXPANSION TANK SIZING
SYSTEM VOLUME
IN GALLONS
TANK CAPACITIES IN GALLONS
Pressurized
Diaphragm Type
Nonpressurized
Type
100 9 15
200 17 30
300 25 45
400 33 60
500 42 75
1,000 83 150
2,000 165 300

For SI: 1 gallon = 3.795 L.

Related Code Sections


1009.2 Boilers, Water Heaters and Pressure Vessels, Closed-Type Expansion Tanks
Closed-type expansion tanks shall be installed in accordance with the manufacturer's instructions. The size of the tank shall be based ...
2012 IMC portion of the 2016 CT State Building Code > 10 Boilers, Water Heaters and Pressure Vessels > 1009 Hot Water Boiler Expansion Tank > 1009.2 Closed-Type Expansion Tanks
1009.2 Boilers, Water Heaters and Pressure Vessels, Closed-Type Expansion Tanks
Closed-type expansion tanks shall be installed in accordance with the manufacturer's instructions. Expansion tanks for systems designed to have ...
2015 IMC portion of the 2018 CT State Building Code > 10 Boilers, Water Heaters and Pressure Vessels > 1009 Hot Water Boiler Expansion Tank > 1009.2 Closed-Type Expansion Tanks
M2301.2.6 Solar Energy Systems, Expansion Tanks
Expansion tanks in solar energy systems shall be installed in accordance with Section M2003 in closed fluid loops that contain heat transfer fluid ...
2012 IRC portion of the 2016 CT State Building Code > 23 Solar Energy Systems > M2301 Thermal Solar Energy Systems > M2301.2 Installation > M2301.2.6 Expansion Tanks
1205.1.6 Hydronic Piping, Expansion Tanks
Shutoff valves shall be installed at connections to nondiaphragm-type expansion tanks ...
2015 IMC portion of the 2018 CT State Building Code > 12 Hydronic Piping > 1205 Valves > 1205.1 Where Required > 1205.1.6 Expansion Tanks
1205.1.6 Hydronic Piping, Expansion Tanks
Shutoff valves shall be installed at connections to nondiaphragm-type expansion tanks ...
2012 IMC portion of the 2016 CT State Building Code > 12 Hydronic Piping > 1205 Valves > 1205.1 Where Required > 1205.1.6 Expansion Tanks
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