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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Industrial Use of GI Puddle Flanges in Sewage, Drainage & Tank Projects

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Introduction: Why GI Puddle Flanges Matter in Infrastructure

Galvanized Iron (GI) puddle flanges are essential for civil and plumbing works where pipelines pass through concrete walls, tanks, and slabs. Their corrosion-resistant zinc coating, strength, and water-sealing capability make them ideal for sewage treatment, drainage systems, and underground tanks in industrial and municipal projects.



What is a GI Puddle Flange?

A GI puddle flange is a flat, circular component installed on pipes that pass through concrete or RCC walls. It creates a watertight barrier between the pipe and the surrounding structure, preventing leakages or seepage.

✅ Key Features:

  • Made from mild steel with hot-dip galvanization

  • Offers rust protection and high durability

  • Designed with a wide collar for firm concrete embedment

Top Industrial Applications of GI Puddle Flanges

🏭 1. Sewage Treatment Plants (STP)

  • Prevents wastewater leakage from RCC tanks and chambers

  • Used at inlet/outlet pipe junctions in STPs

  • Suitable for non-pressurized and pressurized flow

💧 2. Drainage Infrastructure

  • Used in stormwater drains, culverts, and retention tanks

  • Maintains integrity of concrete drains in residential and industrial zones

  • Stops groundwater intrusion in basements and tunnels

🏗️ 3. Underground Water Tanks

  • Ensures leak-proof pipe installation in storage and overhead tanks

  • Especially helpful in urban water supply networks

  • Works with both HDPE, MS, and PVC pipelines

🏢 4. Building Construction

  • Embedded in slabs and walls during high-rise construction

  • Prevents internal water seepage in shafts and utility rooms

  • Complies with building code standards for fire and water safety

🧪 5. Industrial Processing Units

  • Used in chemical, textile, and food industries

  • Withstands aggressive fluids and moisture-laden environments

  • Customizable for large-diameter piping systems

Advantages of GI Puddle Flanges in Industrial Use

BenefitDescription
Corrosion ResistanceZinc-coated surface protects from rust and weather exposure
Cost-EffectiveCheaper than stainless steel, suitable for large-scale public works
Leak PreventionSeals pipe-to-concrete interface, avoiding structural water damage
Long LifespanTypically lasts 5–8 years in harsh environments
Easy to InstallWelds directly to pipe, then cast into concrete for firm bonding
Available in BulkEasily available from Indian manufacturers for infrastructure projects

Installation Best Practices

🔧 How GI Puddle Flanges Are Installed:

  1. Welded to the pipe at the required position.

  2. Encased in concrete during RCC work.

  3. Ensure tight fitting and proper alignment to prevent voids.

  4. Use sealants or gaskets if required for added protection.

  5. Confirm coating thickness meets the project’s durability standard.

GI Puddle Flange Price Range in India (2025)

Size (Inch)Price Range (₹ per piece)
2"₹180 – ₹280
4"₹300 – ₹450
6"₹500 – ₹700
8"₹750 – ₹1,000
10"₹1,000 – ₹1,500

💡 Prices depend on thickness, flange width, zinc coating quality, and quantity ordered.

Certifications & Standards to Look For

When sourcing for industrial or municipal projects, always ensure:

  • ✅ ISI-certified or BIS-compliant

  • ✅ Hot-dip galvanized as per IS 2629 / ASTM A123

  • ✅ Mill Test Certificate (MTC)

  • ✅ Weld and hydro test reports (for large pipes)

Top Cities for GI Puddle Flange Supply in India

  • Delhi NCR – High-volume suppliers for government contracts

  • Mumbai – Export-grade GI flange exporters

  • Ahmedabad & Rajkot – Hub for GI flange casting and machining

  • Hyderabad – Trusted for GI pipe and flange stocking

  • Kolkata & Chennai – Coastal demand for corrosion-prone areas

FAQs: Industrial Use of GI Puddle Flanges

✅ What makes GI puddle flanges suitable for sewage projects?

Their rust resistance, ease of embedment, and low cost make them ideal for sewage and STP tank pipe sealing.

✅ Can GI puddle flanges be used with plastic pipes?

Yes, they are compatible with PVC, HDPE, and MS pipes if properly welded and sealed.

✅ Are GI puddle flanges resistant to chemicals?

Not as much as SS flanges. For chemical exposure, prefer epoxy-coated MS or SS flanges.

✅ What is the difference between GI and MS puddle flanges?

GI flanges have a zinc coating for corrosion protection; MS flanges are raw steel and need coating or painting.

✅ How long do GI puddle flanges last in tank installations?

With proper concrete embedment and exposure conditions, they can last 5–8 years or more.

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