Flanges are a critical component in industrial piping networks, machinery, and processing equipment. Determining the most suitable applications for flanged joints is an important consideration when designing and maintaining these systems. This guide explores optimal uses for ANSI flanges, as well as scenarios where alternative joining methods may be preferable.
Here are common situations where flanged joints are the ideal choice:
Flanges allow quick disconnection for maintenance, cleaning, inspections, part replacements, and reconfigurations. This makes them well-suited for:
While flanges have lower pressure limits than welded joints, high-strength flanges are designed to handle pressures exceeding 10,000 psi. Flanged joints with quality gaskets can also withstand high temperatures exceeding 700°F. Applications such as:
often rely on flanges when pressures or temperatures exceed the limits of other joining methods.
Installing flanges at strategic locations enables quick isolation of individual line segments, valves, inline components, vessels, and other plant equipment. This facilitates maintenance, flow control, and emergencies. Flanges are ideal for:
Flanges allow angular misalignment and offset between pipe ends. This flexibility in positioning is advantageous where:
Flanges readily join different metals, plastic pipes, valves, and other components. They avoid the limitations of welding dissimilar materials. Applications include:
Flange damage can be repaired by simply unbolting and replacing the flange. This avoids the costly replacement of entire pipe sections. Flanges are useful where:
Pipe replacement would be labor-intensive.
While flanges have many benefits, they may not be the best choice in these scenarios:
Applications exceeding flange pressure/temperature limits may require welded joints or specialized flange materials and gaskets. Flanges are often avoided for:
Flanges require extra space for fasteners and gaskets around the pipe diameter. This may not be feasible where:
While flanges facilitate disassembly, permanently welded joints may be favored for piping that will rarely if ever require opening. Permanent joints also make sense where:
Flange joints can loosen over time when subjected to repetitive pipe movements or vibration. All-welded connections may be needed where:
When flanges are determined to be the optimal choice, follow these guidelines for success:
By methodically evaluating needs and properly implementing flanged joints, industrial facilities can maximize operational safety, reliability, and productivity.