Our high-quality stainless steel slip on flange (SO) are designed for efficient and reliable piping connections in low- and medium-pressure industrial systems. Manufactured from premium austenitic and duplex stainless steel, these flanges slide easily onto the pipe before welding, enabling convenient alignment and lower installation costs.
With advanced CNC machining and rigorous quality control, our flanges meet international standards (ASME, EN, JIS, GOST) and are used in various applications worldwide, including chemical, water treatment, oil and gas, and marine engineering.
Technical Specifications
|
Specification |
Technical Detail |
|
Size Range |
NPS 1/2 to NPS 24 (DN15 - DN600) |
|
Pressure Ratings |
Class 150, Class 300 (Other ratings available upon request) |
|
Materials |
ASTM A182 F304, F304L, F316, F316L, F321, F347 Stainless Steel |
|
Facing Types |
Raised Face (RF), Flat Face (FF) |
|
Pipe Schedule Compatibility |
Sch 10, Sch 40, Sch 80, Sch 160 |
|
Surface Finish |
Serrated Stock Finish: 125-250 AARH; Smooth Machined Finish: 63-125 AARH |
|
Standards Compliance |
ASME B16.5, ASTM A182 |
Key Features & Engineering Advantages
The structural stability of our stainless steel sliding flanges depends on the grain flow direction formed during the forging process. We employ controlled heat treatment and hydroforging processes to eliminate internal porosity, ensuring that each component meets the tensile and yield strength requirements specified in ASTM A182. This rigorous manufacturing process prevents stress corrosion cracking at high temperatures.
Selecting the appropriate stainless steel slip on flange prevents premature system failure in corrosive chemical environments. We offer 304/304L stainless steel for general applications and 316/316L stainless steel for high-chloride applications, with a carbon content controlled below 0.03% to reduce intergranular corrosion after welding. These materials form a passivating oxide layer, thus resisting acidic and alkaline media in industrial processing.
Every stainless steel slip on flange we manufacture undergoes rigorous dimensional inspection to verify hub height, bolt hole alignment, and end face thickness. Our manufacturing tolerances strictly adhere to ASME B16.5 standards, ensuring a 1:1 match with existing piping systems from NPS 1/2 to NPS 24. This high precision reduces the risk of gasket bursting and bolt stress during commissioning.
The use of stainless steel slip on flanges significantly reduces labor costs for field assembly. Compared to butt welding solutions, this flexibility facilitates faster installation in confined spaces and complex piping manifolds.
The steel sliding flanges feature double fillet welds, providing a double-seal structure that offers the necessary mechanical strength to withstand pressure ratings of 150 and higher. A variety of end face options are also available to meet the specific sealing requirements of steam, oil, and gas applications.
Industrial Applications
Chemical & Petrochemical
Handling corrosive fluids in process piping where Class 300-600 ratings are standard.
Water Treatment
Municipal and industrial desalination plants utilizing 316L for saltwater resistance.
Food & Beverage
anitary systems requiring smooth, non-porous surfaces to prevent bacterial growth.
HVAC & Fire Protection
Low-pressure water and gas distribution where ease of alignment speeds up installation.
FAQ
Q: Can a slip on flange be used in high-pressure steam services?
A: Slip on flanges are generally limited to Class 150 to Class 600 for steam applications. For higher pressures or severe cyclical loading, ASME B16.5 recommends Weld Neck flanges due to their superior fatigue resistance.
Q: What is the difference between 304 and 316L for slip on flanges?
A: 304 is the standard economical choice for moisture resistance. 316L contains 2-3% Molybdenum, which provides critical resistance to pitting and crevice corrosion in seawater or chloride-heavy environments.
Q: How do you calculate the pipe insertion depth for a slip on flange?
A: The pipe should be inserted into the flange until the pipe end is recessed by the wall thickness plus 3mm. This allows for a proper internal fillet weld without damaging the flange face during the welding process.
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