Puddle Flange Size Chart & Technical Details – Complete 2025 Reference

A puddle flange ensures watertight sealing when pipes pass through concrete structures like water tanks, basements, and foundations. Selecting the correct size is critical for leak prevention and long-term durability. This 2025 reference guide provides a complete size chart, technical details, and installation notes to help engineers, contractors, and suppliers choose the right puddle flange every time.

Why Puddle Flange Size Matters

Choosing the right puddle flange size is essential to ensure proper waterproofing. If the flange is undersized, water can seep along the pipe. If oversized, it may not bond effectively with concrete. A standard size chart helps avoid costly mistakes and ensures structural safety.

Puddle Flange Size Chart (2025 Standard)

How to Read a Puddle Flange Size Chart

• NB (Nominal Bore): The pipe’s internal diameter standard.
• Outer Diameter (OD): The flange’s outside width for concrete grip.
• Thickness: Determines strength and sealing efficiency.
• Pressure Rating: Indicates suitability for different applications like tanks, sewage, or firefighting lines.

Puddle Flange Technical Details

• Material Options: MS (Mild Steel), Stainless Steel (304/316), Rubber.
• Sealing Surface: Ribbed or grooved to bond firmly with concrete.
• Manufacturing Standard: Produced to IS specifications, customizable for projects.
• Durability: Designed for decades of service in wet conditions.

Puddle Flange Sleeve Connection

In many designs, puddle flanges are combined with pipe sleeves. The sleeve protects and aligns the pipe, while the flange ensures water-tightness at the wall. This combination is widely used in basements, water tanks, and underground sewage lines.

Installation Guidelines

1. Select the flange as per NB size and pressure class.
2. Fix the flange around the pipe or sleeve before concreting.
3. Ensure the ribbed/grooved face is embedded in fresh concrete.
4. Avoid voids or honeycombing near the flange.
5. Hydro-test the system to verify watertight performance.

Applications by Size

• 25NB – 50NB: Domestic water tanks, small drainage lines.
• 80NB – 150NB: Fire water tanks, medium pipelines.
• 200NB – 300NB: Industrial pipelines, sewage treatment, chemical plants.

FAQs

Q1. What size puddle flange is used for a 1-inch pipe?

For a 1-inch pipe (25NB), the standard puddle flange has OD ~108mm and thickness ~12mm.

Q2. What is the minimum thickness for puddle flanges?

For small sizes like 25NB, 12mm thickness is recommended. Larger sizes require 20–30mm thickness.

Q3. Can I order custom puddle flange sizes?

Yes, Udhhyog supplies customized MS and SS puddle flanges based on project drawings and site needs.

Conclusion & Contact

A puddle flange size chart is essential for accurate selection and watertight performance. Always match the flange NB to the pipe, check OD and thickness, and follow proper installation steps. For certified MS, SS, and rubber puddle flanges in 2025, choose Udhhyog – your trusted supplier.