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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SS vs GI Puddle Flanges: Which is Better for Industrial Drainage?

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What Are Puddle Flanges?

A puddle flange is a circular ring fitted around a pipe where it passes through concrete, creating a water-tight seal. It prevents leakage between the concrete structure and pipe, crucial in basements, STPs, tanks, and underground industrial drainage systems.

Available in various materials: SS (Stainless Steel), GI (Galvanized Iron), MS, HDPE, PVC

⚙️ Quick Comparison: SS vs GI Puddle Flanges

FeatureSS Puddle FlangeGI Puddle Flange
MaterialStainless Steel (304/316)Galvanized Mild Steel (Zinc)
Corrosion Resistance✅ Excellent (chemical safe)⚠️ Moderate (prone to rust over time)
Lifespan20–30 years5–10 years
Cost (100 mm flange)₹450 – ₹700₹200 – ₹400
Ideal ForSTPs, ETPs, pharma, marineGeneral construction, RCC drains
MaintenanceMinimalNeeds periodic checking
WeldabilityModerate to highEasy

🔍 SS Puddle Flanges – Best for Harsh Environments

✅ Advantages:

  • High resistance to corrosion, especially in chemical-rich or saline environments.

  • Ideal for pharmaceutical, food, STPs, WTPs, marine projects.

  • Stronger structure with longer life expectancy.

  • Works well with HDPE, PVC, and SS piping systems.

❌ Disadvantages:

  • Higher upfront cost

  • Requires precision during installation

🔍 GI Puddle Flanges – Best for Budget Installations

✅ Advantages:

  • Cost-effective for general construction and non-corrosive environments.

  • Available in all standard sizes.

  • Lightweight, easy to install and replace.

  • Best used in stormwater drains, building foundations, and basements.

❌ Disadvantages:

  • Zinc layer may corrode over time, especially in acidic or salty conditions.

  • Not suitable for chemical-heavy drainage.

🧱 Where They’re Used in Industry (Udyog)

Industry TypePreferred Flange TypeReason
PharmaceuticalsSS 304/316No contamination, corrosion-resistant
Food ProcessingSS 304Hygiene compliance
Wastewater TreatmentSS or Coated GILong life under chemical load
Construction UdyogGIBudget-friendly, general use
Chemical IndustrySS 316Resistance to acidic wastewater
Rainwater SystemsGINon-critical, external drainage

💸 Price Comparison in 2025 (India)

Size (mm)SS 304 Puddle Flange PriceGI Puddle Flange Price
100₹450 – ₹650₹200 – ₹350
150₹700 – ₹950₹300 – ₹500
200₹1,000 – ₹1,400₹450 – ₹700
Custom₹1,500+₹700+

Note: Prices vary by thickness, coating, and bolt hole configurations.

🛠️ Which One Should You Choose?

Choose SS Puddle Flanges If:

  • You're working with aggressive chemicals or saline water

  • You need high durability and long-term reliability

  • The structure is permanent or high-value (like STP tanks, pharma plants)

Choose GI Puddle Flanges If:

  • You're on a tight budget

  • The application is non-critical (like basements, rainwater lines)

  • You’re dealing with standard construction projects

✅ Final Verdict: SS vs GI – Who Wins?

Decision FactorWinnerWhy
DurabilitySSCorrosion resistance & long life
PriceGIBudget-friendly
Chemical CompatibilitySSHandles harsh industrial liquids
MaintenanceSSLow upkeep
Weight & EaseGILighter and easier to handle

👉 Conclusion:
SS Puddle Flanges are ideal for industrial and chemical Udyog applications, while GI Puddle Flanges suit residential and low-cost construction needs.

🧾 FAQs – SS vs GI Puddle Flanges

Q1. Are SS flanges worth the extra cost?

Yes, especially in wastewater and chemical drainage. Long-term savings outweigh upfront costs.

Q2. Can GI flanges be used in STPs?

Only if the chemical load is minimal and the flange is well-coated.

Q3. What if I need a custom size?

Most industrial suppliers offer custom fabrication for both SS and GI types.

Q4. Can I replace GI with SS later?

Technically yes, but it requires breaking RCC—so choose wisely during installation.

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