What Are Slip-On Flanges?
Slip-on flanges are a type of pipe flange that slides over the pipe and is then welded in place. Falcon flanges are designed for low-pressure applications and are widely used in industries such as oil & gas, petrochemicals, water treatment, and power plants.
Benefits of Slip-On Flanges
- Cost-Effective: Compared to weld neck flanges, slip-on flanges are more affordable and easier to install.
- Easy Installation: Since they slide over the pipe, they require less precise pipe cutting.
- Versatile Applications: Suitable for low to moderate pressure systems in various industries.
- Durability: Available in different materials like carbon steel, stainless steel, and alloy steel to withstand harsh environments.
Types of Slip-On Flanges by Material
Manufacturers offer slip-on flanges in different materials to suit various industrial applications:
- Stainless Steel Slip-On Flanges: Ideal for corrosive environments in marine, food, and chemical industries.
- Carbon Steel Slip-On Flanges: Commonly used in oil & gas, water treatment, and construction due to high strength.
- Alloy Steel Slip-On Flanges: Preferred for high-temperature and high-pressure applications.
- Duplex & Super Duplex Flanges: Offer enhanced corrosion resistance, used in offshore and chemical industries.
Applications of Slip-On Flanges
Slip-on flanges are widely used in:
- Oil & Gas Pipelines: Connect pipelines in refineries and drilling operations.
- Water Treatment Plants: Ensure leak-proof connections in water distribution systems.
- Chemical Processing: Withstand harsh chemicals and high temperatures.
- Power Plants: Used in steam, thermal, and nuclear power facilities.
How to Choose the Right Slip-On Flange Manufacturer
Selecting a reliable slip-on flange manufacturer involves considering the following factors:
- Certifications & Compliance: Ensure the manufacturer meets international standards like ASME, ASTM, and ISO.
- Material Quality: Verify the material used to ensure durability and resistance to corrosion.
- Manufacturing Capabilities: Choose a manufacturer with advanced technology and a proven track record.
- Customization Options: Some applications require specific flange dimensions and materials.
- Global Supply Chain: Ensure timely delivery and availability of products worldwide.
Slip-On Flanges Specifications
Slip-on flanges are widely used in piping systems for their ease of installation and cost-effectiveness. They slide over the pipe and are welded both inside and outside to provide a secure connection. Below are the key specifications for slip-on flanges:
1. Standards & Specifications
Slip-on flanges are manufactured according to international standards to ensure quality, durability, and compatibility with various piping systems.
- ASME B16.5 – Standard for pipe flanges and flanged fittings (up to 24 inches).
- ASME B16.47 – Large-diameter steel flanges (above 24 inches).
- ASTM A105 – Carbon steel slip-on flanges.
- ASTM A182 – Stainless steel slip-on flanges.
- ASTM A350 – Low-temperature carbon steel slip-on flanges.
- API 6A – Standard for wellhead and Christmas tree equipment.
2. Material Types
Slip-on flanges are available in various materials to suit different applications:
- Carbon Steel: ASTM A105, ASTM A350 LF2 (low-temperature applications).
- Stainless Steel: ASTM A182 F304, F304L, F316, F316L (corrosion resistance).
- Alloy Steel: ASTM A182 F11, F22, F91 (high-pressure, high-temperature applications).
- Duplex & Super Duplex: ASTM A182 F51, F53, F55 (high corrosion resistance).
- Nickel Alloys: Inconel, Monel, Hastelloy (chemical and marine applications).
3. Dimensions & Sizes
Slip-on flanges are manufactured in various sizes to fit different pipe diameters.
- Nominal Pipe Size (NPS): ½” to 48″ (as per ASME B16.5 & B16.47).
- Pressure Ratings: Class 150, 300, 600, 900, 1500, and 2500.
- Flange Face Types:
- Raised Face (RF) – Common in industrial applications.
- Flat Face (FF) – Used in low-pressure applications.
- Ring Type Joint (RTJ) – For high-pressure applications.
4. Pressure-Temperature Ratings
Slip-on flanges are designed to handle different pressure and temperature conditions based on material type and class:
| Class | Pressure (PSI) | Temperature Range |
|---|---|---|
| 150 | 285 PSI | -29°C to 425°C |
| 300 | 740 PSI | -29°C to 425°C |
| 600 | 1480 PSI | -29°C to 425°C |
| 900 | 2220 PSI | -29°C to 425°C |
| 1500 | 3705 PSI | -29°C to 425°C |
| 2500 | 6170 PSI | -29°C to 425°C |
5. Welding & Installation
- Welding Type: Fillet weld on both the inner and outer side.
- Pipe Preparation: The pipe should be properly aligned before welding to avoid misalignment.
- Gaskets: Recommended based on flange face type (Spiral Wound, PTFE, Rubber, etc.).
6. Applications
Slip-on flanges are used in industries like:
- Oil & Gas Pipelines
- Water Treatment Plants
- Chemical Processing Units
- Power Generation
- Marine & Shipbuilding
FAQs About Slip-On Flanges Manufacturers
1. What are the key standards followed by slip-on flange manufacturers?
Manufacturers typically adhere to ASME B16.5, ASTM A182, ASTM A105, and API 6A standards to ensure product reliability and safety.
2. How do I know if a slip-on flange is high quality?
Check for ISO certification, material test reports (MTR), and compliance with ASTM/ASME standards. Also, inspect the welding, finish, and dimensional accuracy.
3. Are slip-on flanges suitable for high-pressure applications?
Slip-on flanges are generally used in low to moderate pressure applications. For high-pressure systems, weld neck flanges are a better choice.
4. What is the difference between slip-on flanges and weld neck flanges?
Slip-on flanges are easier to install and cost-effective, while weld neck flanges provide better strength and leak-proof connections for high-pressure applications.
5. Where can I buy high-quality slip-on flanges?
You can purchase slip-on flanges from reputable manufacturers like Texas Flange, Metal Udyog, and Amardeep Steel Centre, or from online suppliers specializing in industrial piping components.