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// CODE SNIPPET

1112.5 Hydrostatic Expansion

2018 Uniform Mechanical Code of Nevada > 11 Refrigeration > 1112.0 Pressure-Relief Devices > 1112.5 Hydrostatic Expansion
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Pressure rise resulting from hydrostatic expansion due to temperature rise of liquid refrigerant trapped in or between closed valves shall be addressed in accordance with Section 1112.5.1 and Section 1112.5.2. [ASHRAE 15:9.4.3]

1112.5.1 Hydrostatic Expansion During Normal Operation

Where trapping of liquid with subsequent hydrostatic expansion is capable of occurring automatically during normal operation or during standby, shipping, or power failure, engineering controls shall be used that are capable of preventing the pressure from exceeding the design pressure. Acceptable engineering controls include but are not limited to the following:
  1. Pressure relief device to relieve hydrostatic pressure to another part of the system.
  2. Reseating pressure relief valve to relieve the hydrostatic pressure to an approved treatment system. [ASHRAE 15:9.4.3.1]

1112.5.2 Hydrostatic Expansion During Maintenance

Where trapping of liquid with subsequent hydrostatic expansion is capable of occurring only during maintenance—i.e., when personnel are performing maintenance tasks—either engineering or administrative controls shall be used to relieve or prevent the hydrostatic overpressure. [ASHRAE 15:9.4.3.2]

Related Code Sections


1112.5 Refrigeration, Hydrostatic Expansion
Pressure rise resulting from hydrostatic expansion due to temperature rise of liquid refrigerant trapped in or between closed valves shall ...
2018 Uniform Mechanical Code of Nevada > 11 Refrigeration > 1112.0 Pressure-Relief Devices > 1112.5 Hydrostatic Expansion
1209.4 Hydronics, Closed-Type Tanks
Closed-type expansion tanks shall be designed for a hydrostatic test pressure of two and one-half times the allowable working pressure of the system ...
2018 Uniform Mechanical Code of Nevada > 12 Hydronics > 1209.0 Expansion Tanks > 1209.4 Closed-Type Tanks
M2003.1.1 Boilers and Water Heaters, Pressurized Expansion Tanks
Pressurized expansion tanks shall be consistent with the volume and capacity of the system. Tanks shall be capable of withstanding a hydrostatic test ...
Residential Code 2012 of Nevada > 20 Boilers and Water Heaters > M2003 Expansion Tanks > M2003.1 General > M2003.1.1 Pressurized Expansion Tanks
M2003.1.1 Boilers and Water Heaters, Pressurized Expansion Tanks
Pressurized expansion tanks shall be consistent with the volume and capacity of the system. Tanks shall be capable of withstanding a hydrostatic test ...
Residential Code 2018 of Nevada > 20 Boilers and Water Heaters > M2003 Expansion Tanks > M2003.1 General > M2003.1.1 Pressurized Expansion Tanks
1004.3 Boilers and Pressure Vessels, Closed-Type Systems
, and shall be designed for a hydrostatic test pressure of two and one-half times the allowable working pressure of the system. Expansion tanks for systems ...
2018 Uniform Mechanical Code of Nevada > 10 Boilers and Pressure Vessels > 1004.0 Expansion Tanks > 1004.3 Closed-Type Systems
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