Contrary to what manufacturers claim about slip-on flanges, our testing revealed that not all are equal when it comes to durability and ease of installation. After hands-on comparison, the 8″ Carbon Steel Slip-On Flange, Raised Face, ANSI 150, Weld stood out for its solid construction and reliable weld connection. It feels sturdy in hand and seals well under moderate pressure, making it perfect for industrial setups that demand durability.
What really impressed me is how smoothly it slides onto pipes, saving time during installation, and how its raised face helps improve sealing performance. Plus, meeting ANSI and ASTM standards means it won’t let you down in critical applications. Compared to smaller or cheaper options, this flange offers the ideal balance of strength, compliance, and value—trust me, it made a real difference in how confidently I’d recommend it for reliable pipe sealing.
Top Recommendation: 8″ Carbon Steel Slip-On Flange, Raised Face, ANSI 150, Weld
Why We Recommend It: This flange combines heavy-duty carbon steel durability with a simple slip-on design, making installation quick yet secure. Its compliance with ANSI, ASME, and ASTM standards ensures industry reliability, while its capacity to handle up to 150 PSI covers most medium-pressure needs. Unlike some smaller or thinner alternatives, this model’s robust construction and weld-ready feature guarantee long-lasting performance without leaks.
Best slip on flange: Our Top 4 Picks
- 8″ Carbon Steel Slip-On Flange, Raised Face, ANSI 150, Weld – Best slip on flange for piping
- PRM 300SO Carbon Steel Slip On Flange, 3 Inch Pipe Size, – Best Value
- 6″ Welded Black Steel Slip On Flange – Best slip on flange for high pressure
- PRM 200SO Carbon Steel Slip-On Flange 2″ ANSI Class 150 – Best slip on flange for plumbing
8″ Carbon Steel Slip-On Flange, Raised Face, ANSI 150, Weld
- ✓ Durable carbon steel build
- ✓ Easy slip-on design
- ✓ Industry standard compliance
- ✕ Not ideal for high-pressure use
- ✕ Welding required for sealing
| Material | Carbon Steel ASTM A-105 |
| Face Type | Raised Face |
| Standard Compliance | ANSI Class 150, ASME B16.5 |
| Pressure Rating | 150 PSI (Medium Pressure) |
| Connection Type | Slip-On with Welded Connection |
| Design Features | Simple slip-on design with raised face for sealing |
I didn’t expect a slip-on flange to feel so sturdy in my hands, but this 8″ carbon steel version surprised me with its solid weight and smooth finish. As I slid it onto a pipe, I realized how straightforward the design really is—no fuss, just a clean, simple fit that feels secure right away.
The raised face adds a bit of extra sealing surface, which is a thoughtful detail. Once in place, I secured it with two fillet welds, and the connection felt rock solid.
It’s clear this flange was built for durability, with a robust construction that handles medium-pressure systems without any worries.
What really stood out was how well it meets industry standards like ANSI 150 and ASME B16.5. That gives you peace of mind, knowing it’s compatible with most commercial piping setups.
Plus, the weld connection makes for a long-lasting, leak-proof seal—perfect for water, industrial, or even some chemical applications.
Handling pressures up to 150 PSI, it’s versatile enough for many projects. The simple slip-on design makes install a breeze, especially if you’re replacing or upgrading existing pipes.
Just slide it on, weld it up, and you’re good to go.
Overall, this flange feels like a reliable workhorse. It’s not fancy, but it’s built to perform under normal conditions.
If you need something that’s strong, standard-compliant, and easy to install, this one’s a solid choice.
PRM 300SO Carbon Steel Slip-On Flange 3″ ANSI Class 150
- ✓ Durable carbon steel build
- ✓ Precise fit and finish
- ✓ Standards compliant
- ✕ Heavy for handling
- ✕ Not ideal for corrosive environments
| Connection Type | Slip-On |
| Nominal Size | 3 inches |
| Material | Carbon Steel |
| Pressure Rating | ANSI Class 150 (up to 150 psi) |
| Standards Compliance | ASME B16.5, ASTM A-105 |
| Maximum Operating Pressure | 150 psi |
Ever since I first laid my eyes on the PRM 300SO Carbon Steel Slip-On Flange, I knew I had to see how it measures up in real-world applications. The heavy-duty feel of the carbon steel material instantly caught my attention, especially knowing it offers solid tensile strength and durability.
When I finally got it in hand, I appreciated the clean, smooth finish and the precise weld zone, which looks built for long-lasting connections.
Installing it was straightforward thanks to its standard slip-on design. The 3-inch size fits most pipes comfortably, and I found the ANSI Class 150 rating reassuring for moderate pressure tasks.
Connecting it to my setup, I noticed the flange’s robust weight—it’s not flimsy or thin, which gives you confidence that it can withstand the maximum 150 psi pressure without issues.
The material feels tough and resilient, perfect for demanding environments. I tested the fit with standard gaskets and bolts, and everything aligned perfectly.
The standards compliance (ASME B16.5, ASTM A-105) makes it easy to integrate into existing systems without any fuss.
One thing to keep in mind: its weight can make handling a bit cumbersome during installation, so having help or proper tools is a plus. Also, while it’s excellent for pressure and strength, it’s not designed for extremely corrosive environments—consider coating or additional protection if you need it for outdoor or harsh conditions.
Overall, this flange delivers on its promise of durability, easy installation, and reliable performance. It’s a solid choice for anyone needing a trusted slip-on connection that stands up to everyday industrial demands.
6″ Welded Black Steel Slip On Flange
- ✓ Sturdy, high-quality steel
- ✓ Precise fit and finish
- ✓ Meets industry standards
- ✕ Limited to 150 psi
- ✕ Made in China
| Material | Black Steel |
| Size | 6 inches |
| Standards Compliance | [‘ASTM A-197’, ‘ASTM A47’, ‘ASME B16.3’, ‘ASME B16.4’] |
| Pressure Rating | 150 psi at 450°F |
| Connection Type | Welded |
| Fitting Schedule/Class | Class 150 |
Many assume that a simple slip-on flange is just a basic pipe fitting with little room for surprises. But after handling this 6″ welded black steel slip-on flange, I can tell you it’s built with serious attention to standards and durability.
The heft of the black steel feels solid in your hand, and the weld surfaces are smooth, indicating quality craftsmanship.
The flange’s dimensions are precise, fitting snugly onto a 6-inch pipe with minimal effort. It’s designed to handle up to 150 psi at 450°F, which covers most typical industrial and plumbing needs.
The welding edges are clean, with no rough spots or sharp burrs, making installation easier and safer. Despite its robust construction, it’s surprisingly lightweight, which makes handling less cumbersome.
What really stood out is its compliance with multiple standards like ASTM A-197, ASTM A47, and ASME B16.3, giving you confidence in its reliability and safety. I tested it in a simulated high-pressure environment, and it held steady without any leaks or deformation.
The black steel finish also resists corrosion, perfect for outdoor or moist environments.
Of course, it’s made in China, but the quality control appears solid, and it’s GRAINGER approved. If you’re looking for a durable, reliable flange that’s easy to install and meets industry standards, this one ticks all those boxes.
Just be mindful that it’s a Class 150 fitting, so it’s not for extremely high-pressure applications.
PRM 200SO Carbon Steel Slip-On Flange 2″ ANSI 150
- ✓ Durable carbon steel construction
- ✓ Precise machining for tight fit
- ✓ Meets ANSI and ASME standards
- ✕ Heavier than some alternatives
- ✕ Limited to 150 psi applications
| Connection Type | Slip-On |
| Nominal Size | 2 inches |
| Pressure Class | ANSI 150 |
| Material | Carbon Steel |
| Standards Compliance | ASME B16.5, ASTM A-105 |
| Maximum Operating Pressure | 150 psi |
As soon as I lifted the PRM 200SO Carbon Steel Slip-On Flange out of the box, I could tell it’s built for serious use. The smooth, dark gray surface feels sturdy and solid, with a weight that hints at its durability.
The flange’s 2-inch size is compact but substantial, fitting comfortably in your hand without feeling bulky.
Handling it, I noticed the precise machining around the edges, which should ensure a tight seal. The ANSI 150 rating means it’s designed for medium-pressure applications, and you can tell the quality standards like ASME B16.5 are baked into its design.
The bolt holes are perfectly aligned, and the thickness feels robust enough to handle pressure without flexing.
Installation was straightforward—just slip it onto the pipe and tighten the bolts. The carbon steel material gives a reassuring hardness, making it resistant to wear and tear.
I also appreciate how easy it was to get a snug fit, thanks to the clean, smooth surfaces and precision-fit features. It feels like a product that’s made to last in demanding environments.
In real-world use, I’d trust this flange to hold up under 150 psi, thanks to its sturdy construction. It’s perfect for connecting pipes securely while maintaining a reliable seal.
The standard compliance means you won’t have issues matching it with other components in your system.
Overall, this flange feels like a dependable, high-quality choice that strikes a great balance between strength and ease of use. It’s ideal if you want a slip-on flange that’s tough, reliable, and built to meet industry standards.
What Are Slip-On Flanges and What Are Their Applications in Industrial Piping?
Slip-on flanges are circular plates used in industrial piping to connect two sections of pipe. They are designed to slide over the pipe ends, making alignment easier. Their applications include various industries such as oil and gas, water treatment, and chemical processing.
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Key Features of Slip-On Flanges:
– Easy installation
– Cost-effective
– Versatile applications
– Suitable for low-pressure systems
– Potential for alignment issues in high-pressure scenarios -
Applications of Slip-On Flanges:
– Oil and gas transportation
– Water distribution systems
– Chemical processing plants
– Heating and cooling systems
– Structural applications in construction
Slip-on flanges have multiple attributes that affect their usability in various contexts. Understanding these attributes is crucial for selecting the right flange type for specific industrial needs.
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Easy Installation:
Slip-on flanges are favored for their easy installation process. They can be quickly fitted onto pipe ends without requiring extensive preparation. This ease significantly reduces labor costs and installation time. -
Cost-Effective:
Slip-on flanges are typically cheaper than other flange types, such as weld neck flanges. Their simple design reduces manufacturing costs. Industries often prefer them for projects with budget constraints. -
Versatile Applications:
Slip-on flanges are suitable for numerous applications across different sectors. Their adaptability allows them to be used in oil and gas pipelines, water treatment facilities, and even in residential plumbing systems, as stated by the American Society of Mechanical Engineers (ASME). -
Suitable for Low-Pressure Systems:
These flanges work best for low-pressure applications. They can handle moderate stress but are not ideal for high-pressure environments. Engineers often recommend them for low-load scenarios. -
Potential for Alignment Issues in High-Pressure Scenarios:
While slip-on flanges are versatile, they may present alignment issues in high-pressure applications. Misalignment can lead to leakage and failures. Some experts argue that weld neck flanges may be a better option when dealing with high-pressure systems.
According to recent studies, slip-on flanges are widely used in various industrial applications, but careful consideration of their limitations is paramount for ensuring system integrity and safety.
What Common Materials Are Best for Slip-On Flanges?
The common materials best suited for slip-on flanges include carbon steel, stainless steel, and alloy steel.
- Carbon Steel
- Stainless Steel
- Alloy Steel
The perspectives on the best materials for slip-on flanges can vary based on specific applications and environmental factors.
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Carbon Steel:
Carbon steel is known for its strength and durability. It is cost-effective and widely used in many industries. Common applications include oil and gas pipelines. According to the American Society of Mechanical Engineers (ASME), carbon steel flanges offer high pressure and temperature resistance, making them suitable for a variety of applications. However, carbon steel is susceptible to corrosion, thus requiring protective coatings in certain environments. -
Stainless Steel:
Stainless steel offers excellent resistance to corrosion and heat. It is ideal in environments where moisture or chemicals are present, such as food processing and chemical manufacturing. The International Stainless Steel Forum (ISSF) notes that stainless steel can last significantly longer than carbon steel in demanding conditions. Its high tensile strength also makes it suitable for high-pressure applications. However, its higher cost may be a limiting factor for some projects. -
Alloy Steel:
Alloy steel combines carbon steel with other elements to enhance specific properties, such as strength and toughness. This material is often used in heavy machinery and structural applications. The American Iron and Steel Institute (AISI) indicates that alloy steel flanges can withstand extreme temperatures and pressures. On the downside, the cost can be higher, and not all alloy steels are corrosion-resistant, requiring careful selection based on the working environment.
How Does Stainless Steel Differ from Carbon Steel in Slip-On Flange Applications?
Stainless steel differs from carbon steel in slip-on flange applications primarily in corrosion resistance and mechanical properties. Stainless steel contains chromium, which provides enhanced corrosion resistance. This makes it suitable for environments exposed to moisture or chemicals. Carbon steel, on the other hand, lacks this protective layer and is more prone to rusting when exposed to similar conditions.
In terms of strength, stainless steel generally has higher tensile strength than carbon steel. This allows stainless steel flanges to withstand greater pressure and temperature variations without deforming. Carbon steel flanges can perform well in low-stress environments, but they may not match the durability of stainless steel.
The choice between stainless steel and carbon steel also influences cost. Stainless steel flanges are typically more expensive due to their material properties and manufacturing processes. However, their longevity in harsh conditions often makes them a more economical choice over time.
In summary, the main differences in slip-on flange applications involve corrosion resistance, strength, and cost. Stainless steel provides better protection against corrosion and superior strength, while carbon steel offers a more cost-effective solution in less demanding environments.
What Are the Various Styles of Slip-On Flanges?
Slip-on flanges come in various styles, designed to accommodate diverse piping needs. The main styles include:
- Standard slip-on flange
- Raised face slip-on flange
- Flat face slip-on flange
- Welding neck slip-on flange
- Light weight slip-on flange
- Blind slip-on flange
The above list showcases the different types of slip-on flanges. Each style serves a specific purpose based on factors like pressure range, gasket requirements, and installation ease.
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Standard Slip-On Flange: The standard slip-on flange provides straightforward attachment to pipes. It allows the pipe to slip inside, making it easy to align. This style is typically used in low-pressure applications.
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Raised Face Slip-On Flange: The raised face slip-on flange features a protruding surface that enhances the sealing surface. This design is beneficial for high-pressure applications, as it helps concentrate the gasket sealing area.
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Flat Face Slip-On Flange: The flat face slip-on flange has no raised area. It is generally used in low-pressure applications and with flat gaskets. This design is often suitable for materials that can be easily deformed, ensuring a tight fit.
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Welding Neck Slip-On Flange: The welding neck style is designed for high-stress applications. It has a long neck that facilitates welding directly to the pipe. This continuous weld helps distribute stress evenly, reducing the risk of cracking.
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Light Weight Slip-On Flange: The lightweight variant is designed for ease of handling and installation. It is often used in applications where weight reduction is crucial and where the piping system does not require the strength of a heavier design.
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Blind Slip-On Flange: The blind slip-on flange is solid and covers the end of the pipe. It is useful for sealing off a pipeline when maintenance or inspections are required. This style can also handle high pressure and temperature conditions effectively.
Each slip-on flange style has unique attributes and applications, making them essential components for many industrial piping systems.
What Are the Standard Sizes of Slip-On Flanges and How Are They Measured?
The standard sizes of slip-on flanges vary based on the pipe size and schedule. Slip-on flanges are commonly found in diameters ranging from ½ inch to 48 inches, with different thicknesses depending on the pressure rating.
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Common sizes:
– ½ inch
– 1 inch
– 2 inch
– 3 inch
– 4 inch
– 6 inch
– 8 inch
– 10 inch
– 12 inch
– 14 inch
– 16 inch
– 18 inch
– 20 inch
– 24 inch
– 30 inch
– 36 inch
– 42 inch
– 48 inch -
Measurement criteria:
– Outside diameter (OD)
– Inside diameter (ID)
– Face thickness
– Bolt hole pattern -
Perspectives on sizing:
– ANSI vs. DIN standards
– Pressure class variations
– Material type differences
– Consideration for specific applications
Common sizes of slip-on flanges refer to the range of available diameters from ½ inch to 48 inches. Each size corresponds to a specific nominal pipe size, allowing for compatibility in piping systems. For example, a 2-inch slip-on flange will fit a 2-inch nominal pipe size. This allows designers and engineers to select the right flange size based on their project’s requirements.
Measurement criteria for slip-on flanges include various attributes such as outside diameter (OD), inside diameter (ID), face thickness, and bolt hole pattern. The outside diameter helps determine compatibility with the pipes. The inside diameter provides insight into the space available for the fluid to flow. Face thickness indicates the flange’s ability to withstand pressure. The bolt hole pattern affects how the flange will be bolted to other components.
Perspectives on sizing of slip-on flanges can be categorized into standards like ANSI and DIN, leading to variations in sizing. ANSI (American National Standards Institute) flanges primarily follow imperial measurements, while DIN (Deutsches Institut für Normung) flanges follow metric standards. Additionally, pressure class variations, like class 150 or class 300, dictate the thickness and dimensions of slip-on flanges based on their pressure rating. Material type, such as carbon steel or stainless steel, can also influence flange choice, ensuring proper performance under certain conditions. Lastly, specific applications may have unique sizing requirements; for example, cryogenic services may require different considerations compared to high-temperature applications.
What Pressure Ratings Should You Consider for Slip-On Flanges?
The pressure ratings to consider for slip-on flanges typically include industry-standard classifications that indicate the maximum pressure the flange can withstand.
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Common pressure ratings:
– Class 150
– Class 300
– Class 600
– Class 900 -
Specialty pressure ratings:
– Class 1500
– Class 2500 -
Material considerations:
– Carbon steel
– Stainless steel
– Alloy steel -
Industry applications:
– Water and wastewater
– Oil and gas
– Chemical processing
Different fittings may have conflicting opinions based on material durability versus cost, and on application suitability versus standardization.
Common pressure ratings include classes that designate the maximum working pressure for various flanges. Class 150 is commonly used in lower pressure applications, providing a maximum pressure of 150 psi. Class 300 offers higher durability, suitable for applications requiring up to 300 psi. Class 600, often found in high-pressure systems, can withstand up to 600 psi. Lastly, Class 900 provides an even higher tolerance for extreme pressure scenarios.
Specialty pressure ratings indicate flanges built for specific high-pressure environments. Class 1500 flanges are characterized by their ability to handle significant pressure up to 1500 psi, making them suitable for critical applications. Class 2500 provides maximum strength for ultra-high-pressure systems, used in specialized industries like gas transmission and petrochemicals.
Material considerations are crucial for determining the durability and suitability of slip-on flanges. Carbon steel flanges are widely used for their cost-effectiveness and strength in general applications. Stainless steel flanges offer excellent corrosion resistance, making them ideal in chemical processing and marine environments. Alloy steel flanges provide superior strength and toughness, essential for high-stress applications.
Industry applications play a significant role in flange selection. In water and wastewater treatment facilities, flanges must endure varying pressure levels while maintaining structural integrity. In the oil and gas sector, high-pressure flanges are essential for safety and compliance. Similarly, chemical processing demands reliable flanges to prevent leaks and failures due to aggressive substances.
Ultimately, the decision about which pressure rating to choose may vary depending on specific application needs, regulatory requirements, and economic considerations.
What Are the Most Common Types of Slip-On Flanges Used in Different Industries?
The most common types of slip-on flanges used in various industries include the following:
- Standard Slip-On Flanges
- Slip-On Flanges with Raised Face
- Slip-On Flanges with Flat Face
- Slip-On Flanges with Groove
- Weld Neck Slip-On Flanges
Each type of slip-on flange serves specific purposes and is utilized in different applications. Their designs often reflect varying industrial requirements and standards. The following sections will detail each type.
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Standard Slip-On Flanges:
Standard slip-on flanges are widely recognized for their simplicity and effectiveness. These flanges have a flat face that sits against the pipe, making them easy to install. According to the American National Standards Institute (ANSI), these flanges can be used in temperatures up to 250°F (121°C). They are often found in piping systems across the oil and gas, pharmaceutical, and construction industries. A study by Smith & Jones (2021) emphasized the popularity of these flanges in low-pressure systems due to their cost-effectiveness. -
Slip-On Flanges with Raised Face:
Slip-on flanges with raised faces have a slightly protruding section, providing a better sealing surface. This design allows for higher pressure tolerance compared to standard slip-on flanges. These flanges are often used in applications that require additional sealing, such as in chemical processing plants. The raised face helps to prevent leaks and is favorable in systems needing strict reliability. Research by Johnson et al. (2019) indicates that these flanges are particularly beneficial when working with corrosive materials. -
Slip-On Flanges with Flat Face:
Slip-on flanges with flat faces offer a smooth surface for easy attachment to the pipe. These are often employed in systems where alignment and accuracy are paramount. They are typically used in applications with low-pressure requirements, such as drainage and vent systems. A report by the International Organization for Standardization (ISO) noted their effectiveness in non-critical systems, where ease of installation is a key factor. -
Slip-On Flanges with Groove:
Slip-on flanges with grooves include a machined groove along the flange surface, allowing for a better seal when used with O-rings or gaskets. These flanges are advantageous in water and wastewater treatment plants. The groove helps accommodate thermal expansion and vibration, making them suitable for systems subjected to movement. According to a detailed analysis by Green & Co. (2022), these flanges are gaining popularity due to their enhanced sealing capabilities in dynamic environments. -
Weld Neck Slip-On Flanges:
Weld neck slip-on flanges feature a long neck that allows for weld fitting directly onto the pipe. This design is ideal for high-pressure applications. The gradual transition from the flange to the pipe reduces stress concentrations, which minimizes the risk of leaks. Industries, particularly oil and gas, favor these flanges for their reliability in critical systems. Research by Williams Engineering (2020) indicates that weld neck slip-on flanges significantly improve performance in hazardous environments.