Flanges and pipes are essential components in industrial piping systems, used in various industries such as oil & gas, water treatment, power plants, and manufacturing. Understanding the types of flanges, welding techniques, and Class 150 dimensions is crucial for ensuring leak-proof and high-performance installations.
In this guide, we will cover:
Different types of flanges and pipes
Common welding methods for flange-to-pipe connections
Class 150 dimensions and specifications
Downloadable PDF with detailed specifications
Types of Flanges
Flanges are used to connect pipes, valves, pumps, and other components. The selection of a flange depends on the pressure, temperature, and fluid type in the system.
1. Weld Neck Flange (WN)
Has a long tapered hub for high-strength welding.
Used in high-pressure and high-temperature applications.
Ideal for oil refineries, power plants, and chemical industries.
2. Slip-On Flange (SOF)
Slides over the pipe before welding.
Easy to install and cost-effective.
Used in low to medium-pressure systems.
3. Blind Flange (BL)
A solid plate that blocks the pipeline.
Used for sealing pipeline ends or pressure testing.
Common in maintenance and s****hutdown processes.
4. Socket Weld Flange (SWF)
The pipe is inserted into the socket and then welded.
Provides strong leak-proof joints.
Used in small-diameter and high-pressure applications.
5. Threaded Flange (THF)
Screws onto the pipe without welding.
Suitable for low-pressure and non-hazardous systems.
Common in plumbing and gas supply lines.
6. Lap Joint Flange (LJF)
Used with a stub-end fitting.
Allows easy alignment and rotation.
Suitable for systems requiring frequent dismantling.
Types of Pipes
Different pipes are used based on pressure, temperature, and material compatibility.
1. Seamless Pipes
No welding seam, making them stronger.
Used in high-pressure and high-temperature applications.
Common in oil & gas, chemical, and power industries.
2. ERW (Electric Resistance Welded) Pipes
Manufactured by welding steel plates.
Suitable for low to medium-pressure applications.
Used in water transmission, oil refineries, and construction.
3. LSAW (Longitudinal Submerged Arc Welded) Pipes
Features a longitudinal weld seam.
Used for long-distance oil and gas pipelines.
Provides high strength and durability.
4. Galvanized Iron (GI) Pipes
Coated with zinc for corrosion resistance.
Used in water supply systems, HVAC, and irrigation.
5. Stainless Steel (SS) Pipes
Highly corrosion-resistant.
Used in food processing, pharmaceuticals, and marine industries.
Welding Methods for Flange and Pipe Connections
Welding plays a crucial role in ensuring a strong and leak-proof connection between flanges and pipes. The most common welding methods include:
1. Butt Welding
Used for weld neck flanges.
Provides high-strength joints.
Suitable for high-pressure and high-temperature systems.
2. Fillet Welding
Used for slip-on and socket weld flanges.
Easier and faster than butt welding.
Suitable for moderate pressure applications.
3. TIG (Tungsten Inert Gas) Welding
Provides precise, high-quality welds.
Used in stainless steel and alloy piping systems.
4. MIG (Metal Inert Gas) Welding
Faster than TIG welding.
Used in mild steel and galvanized piping systems.
Class 150 Flange Dimensions
Class 150 flanges are widely used in low-pressure piping systems. Below is a standard dimension chart.
| Nominal Pipe Size (NPS) | Flange Diameter (mm) | Bolt Hole Diameter (mm) | Number of Bolts |
|---|---|---|---|
| 1/2" | 90 | 15 | 4 |
| 1" | 125 | 19 | 4 |
| 2" | 150 | 19 | 4 |
| 4" | 230 | 19 | 8 |
| 6" | 280 | 22 | 8 |
| 8" | 345 | 22 | 8 |
| 10" | 405 | 25 | 12 |
Download Class 150 Flange Dimensions PDF
For a detailed reference guide with complete specifications, download the Class 150 Flange Dimensions PDF from Udhhyog. Our PDF includes:
Detailed flange dimensions and pressure ratings
Material specifications
Application guidelines
Why Choose Udhhyog for Flanges and Pipes?
✅ High-Quality Industrial Fittings – MS, SS, and GI pipes and flanges.
✅ Precision Engineering – Ensures accurate threading and durability.
✅ Competitive Pricing – Best rates for bulk and custom orders.
✅ Trusted by Industries – Serving Delhi, Haryana, UP, and J&K.
For high-quality pipes and flanges, trust Udhhyog – your reliable supplier of industrial piping solutions.
Conclusion
Flanges and pipes are integral to industrial piping systems, and selecting the right type, welding method, and size is crucial for efficiency and safety. Class 150 flanges are commonly used in low-pressure applications, and Udhhyog provides top-grade industrial fittings to ensure reliable performance. Download the Class 150 Flange Dimensions PDF for detailed specifications.
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