Puddle Flange Size Chart & Technical Details (2025 Updated)
Puddle Flange Size Chart & Technical Details (2025 Updated)
Accurate sizing is essential when installing a puddle flange in water tanks, basements, STPs, or fire-water systems. A wrong dimension can compromise waterproofing or create pipe stress. This guide provides a 2025 updated size chart for MS and SS puddle flanges, including NB, OD, thickness, and weight with technical recommendations for engineers, contractors, and procurement teams.
Contents- 1) What is a puddle flange size chart?
- 2) Standard size chart (2025 update)
- 3) Technical specifications (MS & SS)
- 4) Installation clearance notes
- 5) Typical applications
- 6) FAQs
- 7) Get full catalogue & drawings
What is a puddle flange size chart?
A puddle flange size chart is a dimension reference sheet that connects pipe NB (nominal bore) with flange outer diameter (OD), ring thickness, and weight. It ensures that the selected flange provides enough embedment in concrete and matches the pipe size. Engineers use these charts to avoid under- or over-sizing, which could result in leakage, voids, or structural mismatch.
Standard puddle flange size chart (2025 update)
*Indicative values – always verify with IS codes, drawings, and project specs.
| Pipe NB (mm) | Approx. Pipe OD (mm) | Flange OD (mm) | Ring Thickness (mm) | Avg. Weight (kg/pc) |
|---|---|---|---|---|
| 25 | 33.7 | 110 | 12 | 1.2 |
| 40 | 48.3 | 140 | 14 | 2.0 |
| 65 | 76.1 | 180 | 16 | 3.2 |
| 100 | 114.3 | 240 | 18 | 5.8 |
| 150 | 168.3 | 300 | 20 | 9.5 |
| 200 | 219.1 | 360 | 22 | 14.5 |
| 250 | 273 | 420 | 25 | 20.0 |
| 300 | 323.9 | 480 | 28 | 26.8 |
Technical specifications (MS & SS)
MS Puddle Flange
- Material: IS 2062 MS plate
- Thickness: 12–30 mm depending on size
- Finish: Painted or epoxy-coated
SS Puddle Flange
- Material: SS 304 or SS 316
- Thickness: 12–28 mm typical
- Finish: Mill or polished, corrosion resistant
Installation clearance notes
- Flange should be fully cast-in with at least 75 mm cover on all sides.
- Center the flange within wall/slab thickness for maximum waterproofing.
- Ensure proper vibration of concrete behind the flange to prevent honeycombing.
Typical applications
- Underground and overhead water tanks
- Basement walls and lift pits
- Sewage treatment plants (STPs/ETPs)
- Fire-water mains and pump rooms
FAQs
Q1. How do I select the right flange OD?
Choose flange OD at least 2–3 times pipe OD for reliable concrete bonding.
Q2. What thickness is best?
12–16 mm for small sizes (25–65 NB), 18–22 mm for medium (100–200 NB), and 25–30 mm for large (250–300 NB).
Q3. Can puddle flanges be customized?
Yes, custom OD, ID, thickness, and materials are available for project-specific requirements.
Get full catalogue & drawings
For complete 2025 puddle flange catalogue including IS code compliance, drawing files, and bulk price list, connect with Udhhyog today.
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