How to Use a Puddle Flange in RCC Slab Construction – Step-by-Step Guide

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  A puddle flange is a simple yet essential fitting used in civil construction to prevent water leakage where pipes pass through concrete structures. In RCC (Reinforced Cement Concrete) slabs, these flanges act as a seal that stops water from migrating along the outer surface of a pipe. Whether you are working on water tanks, basements, lift pits, or underground pipelines, installing a puddle flange correctly ensures waterproofing and structural durability. This step-by-step guide from Udhhyog , a leading supplier of GI, MS, and SS puddle flanges in India, explains how to use a puddle flange during RCC slab construction. 🧰 Step-by-Step Guide ✅ Step 1: Choose the Right Puddle Flange Select a puddle flange based on the pipe size and material (MS, GI, or SS). GI puddle flanges are ideal for general drainage and water pipes. Use stainless steel for corrosive environments or coastal zones. At Udhhyog , we provide puddle flanges in custom sizes with...
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Why Udyog Projects Use MS and GI Puddle Flanges for RCC Walls

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 What Are Puddle Flanges in RCC Construction?

Puddle flanges are circular rings welded around pipes that pass through RCC (Reinforced Cement Concrete) walls, slabs, or tanks. They act as a water-stopping barrier, preventing leakage where pipes intersect with concrete structures.

🏭 Why Are MS and GI Puddle Flanges Popular in Udyog Projects?

Udhhyog (industrial) projects prioritize durability, affordability, and on-site adaptability. Mild Steel (MS) and Galvanized Iron (GI) puddle flanges meet these needs, especially in RCC structures used for drainage, utilities, and process piping.

✅ Key Reasons:

FeatureMS Puddle FlangeGI Puddle Flange
💸 Cost-EffectivenessVery economicalEconomical with rust protection
🛠️ Fabrication FlexibilityEasily cut/welded on-siteModerate fabrication ability
🧱 RCC BondingExcellent anchorage in concreteGood anchorage + corrosion barrier
🔧 Industrial SuitabilitySuitable for heavy-duty Udyog useGreat for utility, drainage, and water works
⚙️ Coating OptionBitumen or epoxy coatedHot-dip galvanized protection

🏗️ Where Are MS & GI Puddle Flanges Used in RCC Udyog Projects?

  1. Underground Water Pipelines

  2. Drainage & Sewage Tunnels

  3. Industrial Plant Basements

  4. Retaining Walls in Water Treatment Plants

  5. Cooling Tower RCC Tanks

  6. Substation RCC Cable Ducts

🏭 Udyog engineers prefer MS and GI flanges due to ease of welding with steel pipes commonly used in RCC pipelines.

🔍 Benefits of Using Puddle Flanges in RCC Construction

  • ✅ Forms a leak-proof concrete seal

  • ✅ Prevents pressure build-up around pipe joints

  • ✅ Strengthens RCC penetration points

  • ✅ Compatible with various pipe materials (MS, GI, PVC)

  • ✅ Withstands movement due to pipe expansion/contraction

💰 MS & GI Puddle Flange Prices in India (2025)

Size (NB)MS Flange (₹)GI Flange (₹)
4 inch₹480 – ₹800₹600 – ₹1,100
6 inch₹850 – ₹1,400₹1,000 – ₹1,800
8 inch₹1,200 – ₹2,000₹1,500 – ₹2,500
12 inch₹2,500 – ₹3,500₹3,000 – ₹4,000

📌 Custom rates apply for heavy-duty RCC use with extra thickness and coatings.

🧰 Installation Tips for RCC Wall Projects

  1. Embed puddle flange halfway into the RCC wall thickness.

  2. Use concrete vibration to ensure no air gaps near the flange.

  3. Apply bitumen or epoxy coating to MS flanges before installation.

  4. Ensure proper pipe alignment through formwork.

  5. For water tanks or sump walls, apply external waterproofing.

🏢 Common Udyog Industries Using MS & GI Puddle Flanges

  • 🚧 Civil Contractors (RCC retaining walls, ducts)

  • 💧 Water Treatment & Drainage Plants

  • 🏭 Manufacturing Industries (utilities, compressed air)

  • 🧪 Chemical Plants (non-corrosive lines)

  • ⚡ Power Sector (underground cabling & utility tunnels)

❓ FAQs

Q1. Are MS puddle flanges rust-proof?

No. MS flanges must be coated (epoxy/bitumen) for corrosion protection in RCC walls.

Q2. Why choose GI flanges over SS in RCC walls?

GI is cost-effective with decent rust protection. SS is better but far more expensive — not always necessary in RCC drainage lines.

Q3. Can MS puddle flanges be custom-sized?

Yes, MS flanges can be cut and welded on-site for custom pipe dimensions in RCC walls.

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