Puddle Flange in RCC Tank – Waterproofing & Installation Guide
Puddle Flange in RCC Tank – Waterproofing & Installation Guide
Puddle flanges are critical for sealing pipe entries in concrete structures like RCC water tanks. They help prevent water seepage at junctions where pipes penetrate reinforced concrete walls or slabs. In this guide, we explain how puddle flanges are used in RCC tank construction, including waterproofing steps, size selection, and embedment methods.
What Is a Puddle Flange in RCC?
A puddle flange is a circular steel or PVC ring welded around a pipe and embedded within an RCC (Reinforced Cement Concrete) wall or slab. It acts as a barrier to water traveling along the pipe surface. By locking the pipe with the surrounding concrete, it ensures a leakproof junction.
Why Use Puddle Flanges in RCC Tanks?
- Prevents water seepage at pipe exits
- Ensures structural integrity of tank wall
- Reduces long-term waterproofing failure
- Required in government tender RCC water tank designs
- Works with MS, GI, SS, or PVC pipes
Size Selection for RCC Tank Pipes
- 25 NB – Overflow or outlet pipes
- 50 NB – Household tank inlet/outlet
- 100 NB – Commercial tank drain lines
- 150–300 NB – Industrial tank suction lines
- Up to 600 NB for large capacity RCC tanks
RCC Cutout & Embedment Guide
- Mark pipe penetration point in shuttering
- Place puddle flange welded to pipe inside RCC formwork
- Use spacers to maintain center position
- Pour concrete around the flange ensuring full embedment
- Cure concrete for 7 days before connecting pipe externally
Waterproofing Options
- GI-coated puddle flange for domestic tanks
- Epoxy coated MS puddle flange for fire tanks
- Bitumen painted puddle flange for rainwater tanks
- SS 304/316 puddle flange for chemical storage tanks
Puddle Flange for RCC – Typical Specs
| Pipe Size (NB) | Flange OD (mm) | Thickness (mm) | Material |
|---|---|---|---|
| 100 NB | 220 | 8 | MS Epoxy |
| 150 NB | 285 | 10 | GI Coated |
| 200 NB | 340 | 12 | Bitumen |
| 300 NB | 445 | 15 | SS 304 |
Buy RCC Tank Puddle Flanges
- Buy Online – Udhhyog Puddle Flange
- Submit RFQ for Custom Size
- Contact for Bulk Supply
- Chat on WhatsApp
Related Articles
- MS Puddle Flange Fabrication Guide
- MS Puddle Flange – Sizes & Specs
- SS 304 Puddle Flange – Rust-Free Option
FAQ – RCC Tank Puddle Flanges
Q1. Can puddle flanges be used in old tanks?
Yes, but retrofitting requires concrete breaking and resealing with waterproof mortar.
Q2. Is it mandatory in government projects?
Yes, most CPWD and PWD RCC tank drawings require puddle flanges for waterproofing.
Q3. What’s the lifespan of MS puddle flanges?
With epoxy coating, life exceeds 15 years under normal water exposure.
Q4. Can I use PVC flanges in RCC?
Yes, for low-pressure or rainwater systems, but not for industrial tanks.
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