Puddle Flange Guide 2025 – Types, Sizes, Sleeves & Price Details

Puddle flange is a circular sealing ring or collar that is fixed permanently around a pipe when it passes through a concrete wall, floor, or foundation. It acts as a barrier that blocks water from leaking along the pipe surface into the structure. Without a puddle flange, water can seep through tiny gaps in concrete, leading to dampness, cracks, and long-term damage. By creating a strong waterproof joint, puddle flanges are widely used in underground basements, sewage systems, fire water tanks, and industrial construction projects where durability and watertight protection are essential.

Table of Contents

• What is a Puddle Flange?
• Puddle Sleeve vs Puddle Flange
• Puddle Flange for Water Tanks
• Types of Puddle Flanges
• MS Puddle Flange
• Puddle Flange Pipe Sleeve
• Puddle Flange Size Chart
• Puddle Flange Detail & Technical Specs
• Installation Guide
• Applications
• FAQs
• Conclusion & Contact

What is a Puddle Flange?

A puddle flange is a circular sealing ring fitted around pipes that pass through concrete structures such as water tanks, basements, manholes, and foundations. Its primary purpose is to prevent water leakage along the external surface of the pipe. When properly installed, it creates a watertight seal that protects structures from seepage and corrosion.

Puddle Sleeve vs Puddle Flange

Puddle Flange for Water Tanks

Water tanks require complete waterproofing. A puddle flange is critical to stop water leakage, protect structural integrity, and comply with safety standards. When pipes pass through tank walls, the flange is cast in place for zero seepage.

Types of Puddle Flanges

• MS Puddle Flange: Durable and widely used in industrial projects.
• Rubber Puddle Flange: Flexible, ideal for sewage and drainage.
• Stainless Steel Puddle Flange (SS 304/316): High corrosion resistance, preferred in chemical industries.

MS Puddle Flange – Features & Applications

• Manufactured as per standards
• Can withstand heavy pressure
• Applications: fire water tanks, basements, drainage systems

Puddle Flange Pipe Sleeve

Sometimes a pipe sleeve is used with a puddle flange:

• Sleeve: Protects the pipe and provides spacing.
• Flange: Ensures waterproofing around the sleeve.

Puddle Flange Size Chart

Puddle Flange Detail & Technical Specs

• Body: MS, SS, or rubber
• Sealing Surface: Grooved/ribbed
• Installation: Cast into concrete
• Pressure Rating: PN6, PN10, PN16

Installation Guide

1. Select correct flange size
2. Weld/attach flange to pipe
3. Position pipe through shuttering
4. Cast concrete ensuring flange is embedded
5. Check for watertight sealing

Applications

• Water tanks
• Drainage systems
• Basements & foundations
• Firefighting systems
• Industrial pipelines

FAQs

Q1. What is the difference between puddle flange and puddle sleeve?

A puddle flange seals against water leakage, while a puddle sleeve only protects the pipe.

Q2. Can MS puddle flanges be used in water tanks?

Yes, they are widely used for durability and strength.

Q3. What size puddle flange should I choose?

Match the Nominal Bore (NB) of your pipe with the flange.

12) Conclusion & Contact

A puddle flange is an essential component for waterproofing in tanks, basements, and pipelines. Whether you need MS, SS, or rubber flanges, choosing the right type ensures long-lasting protection.