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

  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 βœ… 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...

Puddle Flange Uses in Water Retaining Structures – GI Types & Supplier Details

 Discover the role of GI puddle flanges in water retaining structures like tanks, STPs, and drainage systems. Learn their benefits, uses, and top supplier options in India for industrial and civil Udyog projects.


Introduction: Puddle Flange in Water Retaining Systems

Water retaining structures such as RCC tanks, sump wells, STP tanks, and reservoirs require leak-proof pipe penetrations. This is where puddle flangesβ€”especially GI (Galvanized Iron) puddle flangesβ€”play a vital role. Their corrosion resistance, structural strength, and ability to seal pipe entries through concrete make them essential in both industrial Udyog and civil infrastructure projects.


What Is a Puddle Flange?

A puddle flange is a circular plate or collar that is welded or fixed around a pipe where it passes through a concrete wall, slab, or floor, designed to prevent leakage at the pipe-to-concrete interface.

βœ… Key Benefits:

  • Ensures a watertight seal
  • Anchors the pipe within the concrete
  • Prevents water ingress or egress
  • Withstands internal and external pressure

Why GI Puddle Flanges Are Preferred

GI (Galvanized Iron) puddle flanges are steel flanges coated with zinc, offering:

  • High corrosion resistance
  • Long-term durability underground or submerged
  • Better cost-effectiveness than stainless steel
  • Compatibility with both MS and PVC/HDPE pipes

Applications of GI Puddle Flanges in Water Retaining Structures

ApplicationStructure TypePurpose
RCC Water TanksOHTs, UG SumpsPrevent leakage at pipe entry points
STP/ETP TanksIndustrial Wastewater SystemsSeal sewage/outlet/inlet pipes
Rainwater HarvestingCollection TanksSecure vertical drainage pipes
Drainage WellsCivil Drainage NetworksPrevent seepage into foundation
Water Pumping StationsUdyog/utility plantsPressure seal in pump chambers
Swimming PoolsPool Return/Outlet PipesWaterproofing under concrete deck

Technical Specifications of GI Puddle Flanges

FeatureSpecification
MaterialMild Steel with Zinc Coating
CoatingHot-dip galvanizing (avg. 80 microns)
Thickness5 mm to 12 mm
Sizes2” to 24” (custom also available)
StandardsIS 2062 / DIN 2576 (for flanges)
Pressure RatingUp to 10 bar
Pipe CompatibilityMS, PVC, HDPE, SS

Top GI Puddle Flange Suppliers in India

Here are some reliable GI puddle flange manufacturers and suppliers catering to industrial and civil projects:

SupplierLocationSpeciality
Neer Drain Pvt. Ltd.Delhi NCRCivil water tank applications
Techno Puddle FittingsAhmedabadGI & epoxy-coated MS puddle flanges
Flowline IndustriesMumbaiCustom size GI flanges, fast delivery
Jai Bharat EngineeringHyderabadSTP, drainage & utility Udyog supplies
TruTech EngineersCoimbatoreWater treatment GI flange components

πŸ“ž Most suppliers offer bulk pricing and custom flange fabrication for large-scale Udyog projects.


Price Chart: GI Puddle Flanges in India (2025)

Size (Inches)Approx Price (β‚Ή/Piece)
2”₹180 – β‚Ή250
4”₹300 – β‚Ή450
6”₹500 – β‚Ή650
8”₹650 – β‚Ή850
10”₹900 – β‚Ή1200
12”₹1300 – β‚Ή1600

πŸ’‘ Prices vary based on zinc coating thickness, flange width, and order quantity.


Advantages of GI Flanges in Concrete Structures

  • πŸ›‘οΈ Zinc coating protects against rust & oxidation
  • πŸ”© Easily welded or clamped onto MS pipe
  • 🧱 Perfect for embedding in RCC walls and slabs
  • πŸ’§ Maintains hydraulic seal even under pressure
  • 🧰 Suitable for both inlet and outlet pipe connections

Installation Tip

When casting a puddle flange in RCC:

  • Ensure minimum concrete cover of 50 mm
  • Apply bitumen or epoxy coating at the interface if additional sealing is required
  • Use formwork rings to keep flange centered during casting

GI puddle flanges are indispensable for water retaining and concrete structures in both civil and Udyog projects. Their durability, corrosion resistance, and cost-effectiveness make them ideal for a wide range of applications, from drainage lines to municipal water tanks. Choose reliable suppliers, verify zinc coating quality, and ensure correct RCC installation for long-term performance.

FAQs – GI Puddle Flanges for Water Retaining Structures

Q1. Can GI puddle flanges be used for potable water tanks?

βœ… Yes. Ensure food-grade zinc coating or epoxy coating for potable water usage.

Q2. Are GI flanges suitable for chemical tanks?

❌ No. Use SS 316 puddle flanges for chemical resistance in STP or ETP.

Q3. How long does a GI flange last underground?

Typically 10–15 years if proper galvanizing and installation are followed.

Q4. Do I need to weld the GI flange to the pipe?

Yes, usually it's welded to MS pipe or clamped tightly for PVC pipes using sealing gaskets.

Q5. Where can I buy GI puddle flanges in bulk?

Contact manufacturers in Delhi, Ahmedabad, Mumbai, Coimbatore, or Ludhiana for direct pricing.

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