Flange
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.
💡 Key Takeaways
- ✓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.
- ✓Alignment is critical to prevent leaks and premature gasket failure.
- ✓Match flange material and pressure rating to the system.
- ✓Regular inspections catch corrosion, loosening, or gasket wear.
Flange
/flændʒ/
Definition
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
Quick Facts
How Flange Works
Flanges allow serviceable, sealed connections.
Real-World Application
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.
Pro Tip
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.”
Important Things to Keep in Mind
- Alignment is critical to prevent leaks and premature gasket failure.
- Match flange material and pressure rating to the system.
- Regular inspections catch corrosion, loosening, or gasket wear.
Did You Know?
Flange standards like ANSI help ensure compatibility across manufacturers and systems.
FAQ
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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