Slip On Flanges

A slip on flange is a circular pipe flange with a bored center slightly larger than the outer diameter of the pipe. Welded internally and externally after fitting over the pipe, the flange creates a reliable and sealed joint. It is placed over the pipe and welded from both sides to establish a reliable and pressure tight seal. Its design allows easier alignment during installation and makes it ideal for applications involving systems with low pressure, moderate flow or non critical service requirements. Standardization is maintained through dimensions set by ASME B16.5 and EN 1092 guidelines.

Slip on flanges provide several practical advantages in industrial piping. Their ease of installation reduces alignment time during welding and requires less precision when cutting pipe lengths. The internal and external welds offer strength and leak resistance in applications with moderate stress. These flanges offer a budget friendly solution and are commonly used in applications requiring larger size availability. Their flat face or raised face configurations allow compatibility with a range of gasket types used in mechanical or fluid systems.

Slip on flanges are commonly used in water supply, cooling circulation, fire protection systems and low temperature chemical processing units. They are frequently selected for applications where the system pressure remains low and flange disassembly is not regularly needed. Typical installations include pipeline connections, equipment nozzles and pump suction or discharge lines. Due to their simplicity, they are widely used in HVAC ducting, utility services, waste water lines and industrial plant piping where moderate pressure containment is sufficient.