Overview
Slip On Flange (SO Flange) is a type of pipe flange designed to slide over the outside of the pipe and be welded both inside and outside to provide a secure and leak-resistant connection.
Compared with Weld Neck Flanges, Slip On Flanges offer easier alignment and lower installation cost, making them widely used in low to medium pressure piping systems across various industries.
Key Features & Advantages
-
Easy pipe alignment and installation
-
Welded inside and outside for reliable sealing
-
Cost-effective solution for general piping systems
-
Smooth flow transition with minimal turbulence
-
Suitable for low to medium pressure and temperature service
-
Available in RF, FF and RTJ facing types
-
Custom machining and special dimensions available
Standards Compliance
Our Slip On Flanges are manufactured according to major international standards:
-
ASME B16.5 / ASME B16.47
-
EN 1092-1
-
DIN Series
-
JIS B2220
-
GOST 12820 / GOST 33259 (Russia & CIS markets)
Materials & Grades
-
Carbon Steel: ASTM A105, ASTM A350 LF2
-
Stainless Steel: ASTM A182 F304 / F316 / F321
-
Alloy Steel: ASTM A182 F11 / F22 / F5 / F9 / F91
-
Low Temperature Steel: ASTM A350 LF3
-
Special Materials: Duplex Stainless Steel, Inconel, Monel, Hastelloy
Size & Pressure Range
-
Size: DN15 – DN2000 (1/2" – 80")
-
Pressure Class: Class 150 – Class 2500
-
Facing Types: RF / FF / RTJ
-
Connection Type: Slip-on & Welded
Manufacturing Process
-
Forging or rolled plate forming
-
CNC machining
-
Heat treatment
-
Dimensional inspection
-
Surface finishing (black paint, anti-rust oil, zinc coating, epoxy coating)
Quality Control & Inspection
-
Chemical composition analysis
-
Mechanical property testing
-
Dimensional inspection
-
PMI (Positive Material Identification)
-
NDT: UT / MT / PT / RT (upon request)
-
Mill Test Certificate (EN 10204 3.1) provided
Applications
Slip On Flanges are widely used in:
-
Oil & gas pipelines
-
Petrochemical and chemical plants
-
Power generation systems
-
Water treatment plants
-
Shipbuilding and marine pipelines
-
General industrial piping systems
Why Choose Our Slip On Flanges
-
Produced according to international standards (ASME / EN / DIN / JIS / GOST)
-
Full range of sizes and pressure classes
-
Stable supply for bulk and project orders
-
Custom machining based on drawings
-
Strict quality control and inspection system
-
Global export experience