We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
A slip-on flange (SO flange) is a type of pipe flange designed to slide over the end of a pipe. Its inner diameter is slightly larger than the pipe’s outer diameter, allowing the pipe to be inserted into the flange before welding. Once positioned, the pipe and flange are connected using fillet welds on both the inner and outer sides, ensuring a secure joint.
Key Features of Slip-On Flanges
Design
Slip-on flanges have a flat face and simple structure.
The design allows the flange to slip over the pipe, making it easy to align during installation.
Installation
Easier to install compared to weld neck flanges.
Precise pipe end alignment is not required—the flange can be adjusted before welding.
Welded on both sides (top and bottom) to improve strength and leak resistance.
Applications
Commonly used in low-pressure piping systems.
Widely applied in oil & gas, water treatment, chemical processing, and HVAC industries.
Cost-Effectiveness
More affordable than weld neck flanges due to simpler design and easier installation.
Suitable where moderate strength and sealing are sufficient.
Material Options
Available in carbon steel, stainless steel, alloy steel, and other custom materials depending on service conditions.
Limitations
Not recommended for high-pressure or high-temperature applications.
Potential leakage risk at the weld joint compared with stronger flange types.
Summary
Slip-on flanges are cost-effective, easy to install, and versatile for low-pressure systems, making them a popular choice in many industrial applications. However, they are less suitable for high-pressure environments compared to weld neck flanges.
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