Flange Types Explained – Blind, Weld Neck, Socket Weld & Lap Joint Uses

 Flanges are critical pipe components used to connect pipes, valves, pumps, and other equipment in a piping system. They allow for easy disassembly and maintenance. Understanding the types of flanges helps ensure that you choose the correct one based on your industrial application. In this guide, we'll explore the most commonly used flanges—blind, weld neck, socket weld, and lap joint—and their best use cases.

If you're looking for top-quality flanges, Udhhyog is one of the best flange manufacturers and suppliers in Delhi, offering durable, IS-standard flanges at competitive prices.

What is a Flange?

A flange is a mechanical device used to connect pipes, valves, or pumps together. It provides strength, seals, and easy disassembly of piping systems. Flanges are typically welded or screwed onto pipes and sealed with gaskets and bolts.

Types of Flanges and Their Applications

🔹 1. Blind Flange

• What it is: A flange with no bore (no center hole)

• Use: To seal the end of a piping system or pressure vessel

• Common Applications: Testing pipe pressure, isolating pipe sections

• Advantages: Easy to remove for inspection; strong seal under pressure

🔹 2. Weld Neck Flange

• What it is: Flange with a long tapered hub welded to the pipe

• Use: For high-pressure, high-temperature applications

• Common Applications: Oil and gas pipelines, power plants

• Advantages: Excellent strength; reduces stress concentration

🔹 3. Socket Weld Flange

• What it is: Pipe inserted into flange socket and welded around

• Use: Small-diameter high-pressure pipelines

• Common Applications: Chemical and hydraulic pipelines

• Advantages: Smooth bore flow; better fatigue strength than slip-on flanges

🔹 4. Lap Joint Flange

• What it is: Flange used with a stub end; not welded to the pipe

• Use: Systems requiring frequent dismantling

• Common Applications: Low-pressure systems, food-grade pipelines

• Advantages: Easy alignment; cost-saving for expensive pipe materials

Comparison Table – Flange Types

Flange Type	Welded?	Pressure Rating	Best Use Case
Blind	No	High	End sealing, inspection points
Weld Neck	Yes	Very High	Long-term, high-stress systems
Socket Weld	Yes	High	Small pipes, clean systems
Lap Joint	No	Low to Medium	Systems requiring frequent access

Flange Standards and Dimensions

All flange types are available in standard classes:

• Class 150, 300, 600 (ANSI)

• PN10, PN16, PN25 (DIN/IS)

📌 For detailed dimension charts and PDF downloads, visit: Udhhyog Flange Catalogue

Why Flange Type Matters

Choosing the correct flange depends on:

• Pressure and temperature of your pipeline

• Material compatibility

• Frequency of maintenance and inspection

• Welding preference or restriction

Udhhyog – Your Trusted Flange Supplier in Delhi

At Udhhyog, we offer a full range of flange types:

• MS Flanges (Mild Steel)

• GI Flanges (Galvanized Iron)

• SS Flanges (Stainless Steel 304/316)

• Available sizes: 15mm to 600mm

• Pressure class: 150, 300, PN10, PN16

📍 Serving across Delhi, Haryana, Uttar Pradesh, Punjab, Rajasthan, J&K, Himachal Pradesh.

📞 Visit udhhyog.com or call today for bulk orders, custom fabrication, and delivery options.

FAQs

Q1: Which flange is best for high pressure?
A: Weld neck flange is ideal for high-pressure applications.

Q2: Which flange is best for systems requiring frequent maintenance?
A: Lap joint flange due to its removable nature.

Q3: Where can I buy flanges in Delhi at best price?
A: Visit Udhhyog – Delhi’s top flange manufacturer and distributor.