A flange is a mechanical connection used in plumbing and HVAC systems to join pipes, valves, pumps, or duct components. It is a flat rim or collar that bolts to a matching flange, creating a secure, serviceable, and leak-resistant joint. Flanges come in many sizes and materials to match pressure, temperature, and system requirements.
/flændʒ/
A flange is a mechanical connection used in plumbing and HVAC systems to join pipes, valves, pumps, or duct components. It is a flat rim or collar that bolts to a matching flange, creating a secure, serviceable, and leak-resistant joint. Flanges come in many sizes and materials to match pressure, temperature, and system requirements.
What is a flange used for?
It connects pipes or components with bolted joints that can be serviced without cutting the line.
Source: The Cooling Company
Flanges allow serviceable, sealed connections.
During a commercial HVAC or water heater install, technicians use flanges to connect piping so components can be removed for future service without cutting pipe.
Use the correct gasket and torque pattern to prevent leaks and uneven stress on the flange.
“Use the correct gasket and torque pattern to prevent leaks and uneven stress on the flange.”
Flange standards like ANSI help ensure compatibility across manufacturers and systems.
Do flanges require gaskets?
Yes. Gaskets provide the seal between mating flanges to prevent leaks.
Can flanges be reused?
Flanges often can, but gaskets should be replaced and surfaces inspected for damage.
Are flanges used in HVAC ductwork?
Yes. Flanged duct connections are common in commercial systems for serviceability.
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