A ‌SO flange‌ (Slip-On Flange) is a type of pipe flange designed for easy installation and moderate-pressure applications. 

1. ‌Design & Function‌

• ‌Slip-On Mechanism‌: The pipe slides into the flange’s slightly larger bore before being welded (both inside and outside) for a secure connection‌.
• ‌Short Neck‌: Unlike welding neck flanges (WN), SO flanges have a minimal neck, making them lighter and more cost-effective‌.
• ‌Pressure Handling‌: Suitable for ‌low to medium pressure‌ systems (e.g., Class 150–900)‌.

2. ‌Key Applications‌

• ‌Pipelines‌: Connects pipe ends or blanks off sections (e.g., for inspections)‌.

• ‌Equipment Integration‌: Used at inlets/outlets of valves, pumps, or reducers‌.

• ‌Common Industries‌: Water treatment, HVAC, and general industrial piping‌.

3. ‌Materials & Standards‌

• ‌Materials‌: Carbon steel (A105, Q235), stainless steel (304/316L), and alloy steels‌.
• ‌Standards‌: Complies with ‌ANSI B16.5‌, ‌ASME B16.47‌, DIN, and GB/T‌