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July 05, 2019 1 min read

What is Thermal Expansion and how do we account for it?

Thermal expansion occurs when the oil in the distribution piping is exposed to heat from space heaters or simply from the increased temperature at ceiling level. It causes an expansion in the system that can cause seals to leak, hoses to rupture and, in some cases, pump casings to crack. A common symptom is an excessively pressurized system at the first usage of the day. (A 1 degree F increase in temperature in a 25 ft hose reel can increase pressure by 40 psi).

Thermal relief kits are sized for the pump output pressure. They relieve small amounts of fluid back to the tank to prevent damage.


Fireball Equipment Ltd.
16815 117 Avenue NW 
Edmonton, AB T5M 3V6

Within Canada:
Phone: (780) 944-4818 
Fax: (780) 944-4898 
Email: info@fireball.ca

USA or Outside North America:
+1 (877) 944-4818
Fax: (780) 944-4898 
Email: info@fireball.ca

For Service:

Phone: (780) 944-4814
Email: service@fireball.ca

For repair parts and equipment sales:

Phone: (780) 944-4819 
Email: insidesales@fireball.ca

Location: Calgary 
Phone: (403) 776-0605

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Phone: (306) 717-2125

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Phone: (306)-216-6534

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Phone: (204) 500-0797

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