Home > News > Industry News > Advantages and disadvantages of slip-on flanges

Advantages and disadvantages of slip-on flanges

Sep. 11, 2025

Slip-on flanges are a common flange type. During installation, the pipe is inserted into the flange's inner hole and secured with a fillet weld. Due to its simple structure and relatively low price, it is widely used in low-pressure piping systems. Below, I summarize the main advantages and disadvantages of slip-on flanges:

Advantages

Easy installation

The pipe is inserted into the flange's inner hole, positioned, and then welded on both sides. This operation is simpler than a butt-weld flange and requires less weld precision.

Lower cost

Material and processing requirements are lower than those of a butt-weld flange, making it suitable for large-scale use and more economical overall.

Lower pipe end surface requirements

Simply flatten the pipe end, eliminating the need for the stringent beveling required for butt-weld flanges.

Wide range of applications

Commonly used in low-pressure, medium- and low-temperature piping systems, suitable for conveying media such as water, steam, compressed air, and low-pressure oil and gas.

Easy maintenance and replacement

Easier disassembly and assembly for pipeline modification or maintenance, reducing installation complexity. Disadvantages:

Poor strength and rigidity

Because it's only a fillet weld connection, its overall load-bearing capacity and tensile strength are inferior to those of butt-weld flanges, and its pressure-bearing capacity is limited.

Welding stress concentration: The welds are located on the inside and outside, which can easily cause stress concentration when subjected to stress. It's not suitable for environments with high stress, strong vibration, or hazardous media.

Slightly poor corrosion resistance: The flange's inner bore is slightly larger than the pipe diameter, creating a gap between the pipe end and the flange, which can easily trap media and cause crevice corrosion.

Unsuitable for high pressure and high temperature: Its general operating pressure rating is PN 1.6 MPa or below (or Class 150 or Class 300). Its use in environments with high temperature, high pressure, or flammable and toxic media poses a greater risk.

Low sealing reliability: Compared to butt-weld or socket-weld flanges, its sealing performance is slightly weaker, making it unsuitable for applications requiring extremely high sealing performance.

Summary:

Slip-on flanges offer advantages such as easy installation and low cost. They are commonly used in low-pressure, non-critical piping systems (such as water treatment, HVAC, and general industrial pipelines). However, in environments with high pressure, high temperature, severe corrosion, or extremely high safety requirements, butt-weld flanges or socket-weld flanges are typically used.

Cangzhou Aosendic Pipe Fittings Manufacturing Co., Ltd. is a large-scale manufacturer specializing in elbows, tees, reducers, elbows, and caps. We comply with ASTM, ANSI, JIS, DIN, GB, and other standards, covering virtually all steel types.

Please contact us for any purchasing needs or questions.

Mobile: 86-13668807131

Website: https://www.authenticfitting.com/

Address: Mengcun Hui Autonomous County, Cangzhou City, Hebei Province

Email: authentic013@steelpipes-fitting.com

Previous: The key to success in wholesale pipe fittings

Next: Advantages of stainless steel elbows in chemical piping systems

Latest News

Industry News

Nov. 04, 2025

Advantages of stainless steel elbow fittings for underground and underwater use

1. Strong corrosion resistance, rust-proof: Underground environments are humid, and underwater environments contain high levels of salt and impurities, making ordinary carbon steel prone to rust and perforation.
Industry News

Oct. 29, 2025

Understand the characteristics and applications of stainless steel flanges

Have you ever encountered a situation where you needed to connect two pipes or pieces of equipment? If so, then you're certainly familiar with the word "flange." A flange is an important component used to connect pipes and equipment, and stainless steel flanges are one of the most common and popular types. In this article, we'll delve into the characteristics and applications of stainless steel flanges, giving you a more comprehensive understanding of this field.
Industry News

Oct. 27, 2025

How to choose stainless steel elbow fittings?

First, determine the material flowing through the pipe. If the pressure in a general water plant pipeline is low, a straight seam elbow is more cost-effective. Straight seam elbows are made by pushing straight seam steel pipe. For high-temperature applications, seamless elbows are essential for better pressure resistance. If the pipe is used in chemical or corrosive equipment, stainless steel or alloy materials should be selected.

Authentic is here to help you find the right pipe fittings and flanges for your specific needs.

Pipe Fittings

Flanges

Carbon Steel Elbow

Stainless Steel Elbow

Alloy Elbow

Carbon Steel Tee

PL Flange

Flat Welding Flange with Neck

Carbon Steel Welded Flange

Alloy Steel Butt Welding Flange

FAQ

What certifications do your products have?

Our products comply with international standards such as ASTM, ANSI, JIS, DIN, and GB. We also hold various certifications to assure quality and reliability, including ISO 9001.

How can I get some samples?

If you need, we will offer you samples for free, but new customers are expected to pay express charge.

To which country have you supplied your products?

We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru, USA, Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.)

Get Quote

Have questions or need a custom solution? Reach out to us!

Our team at Authentic is here to help you find the right pipe fittings and flanges for your specific needs.