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Slip On Flange: Types, Dimensions & Uses in Stainless Steel Piping
Slip On Flanges are widely used in piping systems due to their simple structure, easy alignment, and affordability. If you’re working with stainless steel piping in industries like dairy, pharmaceuticals, or food processing, understanding the function and specifications of Slip On Flanges is essential.
This guide explains everything you need to know about Slip On Flanges, including sizes, uses, benefits, and how they compare with other flange types.
What Is a Slip On Flange?
A Slip On Flange is a type of pipe flange designed to slide over the pipe and is then welded from both inside and outside. This dual welding offers better strength and prevents leakage, making it suitable for low to medium pressure piping applications.
These flanges are commonly used with stainless steel pipes and fittings. At Mahadev Dairy Pharma Fittings, we manufacture high-quality stainless steel slip on flanges using SS 304, SS 316, and SS 304L materials.
You can also explore our Stainless Steel Flanges section for various types including weld neck, blind, and threaded flanges.
Slip On Flange Dimensions
The table below lists some standard dimensions for Slip On Flanges as per ASME B16.5:
| Nominal Pipe Size (NPS) | Flange OD (mm) | Thickness (mm) | Bolt Holes | Bolt Size |
|---|---|---|---|---|
| 1/2” | 90 | 11.2 | 4 | M12 |
| 1” | 110 | 12.7 | 4 | M16 |
| 2” | 150 | 14.3 | 4 | M16 |
| 4” | 225 | 19.1 | 8 | M16 |
| 6” | 280 | 22.3 | 8 | M20 |
For complete details, you can also check our pipe weight chart which pairs well with slip on flange selection.
Advantages of Slip On Flanges
- Easy to install – especially helpful when pipe alignment is difficult.
- Cost-efficient – more affordable compared to weld neck flanges.
- Low welding cost – requires less precision, ideal for standard installations.
- Internal and external welds – improve leak resistance.
Slip on flanges are preferred in systems using stainless steel heat exchanger tubes where medium pressure fluid handling is involved.
Common Applications
Slip On Flanges are used in various sectors including:
- Food & Beverage
- Dairy Processing
- Pharmaceutical Manufacturing
- Chemical Pipelines
- Firefighting and HVAC systems
They are often combined with hygienic piping components such as ASTM A270 Tubing for sterile environments.
Material Grades Available
We manufacture Slip On Flanges in the following stainless steel grades:
- SS 304 / SS 304L
- SS 316 / SS 316L
- As per standards like ASTM A182 and A240
You may also want to explore our Stainless Steel 304L Flanges for low-carbon applications.
Slip On Flange vs Weld Neck Flange
| Feature | Slip On Flange | Weld Neck Flange |
|---|---|---|
| Cost | Lower | Higher |
| Strength | Moderate | High |
| Weld Type | Fillet weld (inside & outside) | Butt weld |
| Alignment Needed | Less critical | High precision |
| Application | Low to medium pressure | High pressure, high temperature |
When the system requires greater mechanical strength and stress handling, weld neck flanges are the better choice. For general service, slip on flanges are more than sufficient.
Conclusion
A Slip On Flange is a practical, cost-effective flange used widely in stainless steel piping systems. With easy installation and decent strength, it suits most general-purpose industrial applications.
If you are sourcing stainless steel flanges in India, you can count on Mahadev Dairy Pharma Fittings for quality products and reliable support. Our offerings are compatible with our full range of stainless steel tubes and fittings, ensuring complete piping solutions.
FAQs
1. What is the pressure rating of a standard Slip On Flange?
Slip On Flanges are available in pressure classes from 150 to 600, suitable for low to moderate pressure systems.
2. How is a slip on flange installed?
To install a slip on flange:
Slide the flange over the pipe.
Position it at the required location.
Weld the inner and outer circumference of the flange to the pipe.
This dual weld ensures strength and leak resistance.
3. What are the common sizes of slip on flanges?
Slip on flanges are available in a wide range of sizes from ½ inch to 24 inches, and even larger for custom industrial applications. The most common sizes for industrial use include 1”, 2”, 4”, and 6”.
4. Is a slip on flange better than a weld neck flange?
Both have different purposes:
Slip on flanges are cheaper and easier to install, ideal for low-pressure systems.
Weld neck flanges are stronger and used in high-pressure, high-temperature applications.
For hygienic and low-pressure lines like in dairy or pharma, slip on flanges are a great choice.
5. What materials are slip on flanges made of?
Slip on flanges are manufactured in various materials such as:
Stainless Steel (SS 304, SS 316)
Carbon Steel
Alloy Steel
Stainless steel is most popular in food-grade and chemical industries for its corrosion resistance.
6. Are slip on flanges suitable for high-pressure systems?
They can be used up to moderate pressures, typically up to Class 600. For extremely high pressure (Class 900 and above), weld neck or socket weld flanges are usually recommended.
7. What industries commonly use slip on flanges?
Slip on flanges are commonly used in:
Dairy & Food Processing
Pharmaceutical Industry
Water Treatment Plants
Chemical Plants
HVAC & Firefighting Systems
8. Can slip on flanges be used with stainless steel pipes?
Yes. Slip on flanges are frequently paired with stainless steel pipes, especially in hygienic environments. For example, SS 304L pipes and fittings work perfectly with SS slip on flanges.
9. What standards govern slip on flange dimensions?
Slip on flanges are manufactured as per:
ASME B16.5 for NPS ½” to 24”
BS 4504 / EN 1092-1 for European standards
DIN standards in some industrial regions
10. How do I choose the right slip on flange?
When selecting a slip on flange, consider:
Pipe size (NPS)
Pressure rating (Class 150, 300, etc.)
Material grade (SS 304, SS 316)
Application environment (corrosive, food-safe, etc.)
For assistance, consult with your supplier or check our flange dimension chart.
