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.
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
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
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
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
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 TypeWelded?Pressure RatingBest Use CaseBlindNoHighEnd sealing, inspection pointsWeld NeckYesVery HighLong-term, high-stress systemsSocket WeldYesHighSmall pipes, clean systemsLap JointNoLow to MediumSystems 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
Choosing the correct flange depends on:
Pressure and temperature of your pipeline
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:
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.
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.
