Puddle Flange Uses in Water Retaining Structures β GI Types & Supplier Details
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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 flangesβespecially GI (Galvanized Iron) puddle flangesβplay 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.
β 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
Application | Structure Type | Purpose |
---|---|---|
RCC Water Tanks | OHTs, UG Sumps | Prevent leakage at pipe entry points |
STP/ETP Tanks | Industrial Wastewater Systems | Seal sewage/outlet/inlet pipes |
Rainwater Harvesting | Collection Tanks | Secure vertical drainage pipes |
Drainage Wells | Civil Drainage Networks | Prevent seepage into foundation |
Water Pumping Stations | Udyog/utility plants | Pressure seal in pump chambers |
Swimming Pools | Pool Return/Outlet Pipes | Waterproofing under concrete deck |
Technical Specifications of GI Puddle Flanges
Feature | Specification |
---|---|
Material | Mild Steel with Zinc Coating |
Coating | Hot-dip galvanizing (avg. 80 microns) |
Thickness | 5 mm to 12 mm |
Sizes | 2β to 24β (custom also available) |
Standards | IS 2062 / DIN 2576 (for flanges) |
Pressure Rating | Up to 10 bar |
Pipe Compatibility | MS, 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:
Supplier | Location | Speciality |
---|---|---|
Neer Drain Pvt. Ltd. | Delhi NCR | Civil water tank applications |
Techno Puddle Fittings | Ahmedabad | GI & epoxy-coated MS puddle flanges |
Flowline Industries | Mumbai | Custom size GI flanges, fast delivery |
Jai Bharat Engineering | Hyderabad | STP, drainage & utility Udyog supplies |
TruTech Engineers | Coimbatore | Water treatment GI flange components |
π 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 (βΉ/Piece) |
---|---|
2β | βΉ180 β βΉ250 |
4β | βΉ300 β βΉ450 |
6β | βΉ500 β βΉ650 |
8β | βΉ650 β βΉ850 |
10β | βΉ900 β βΉ1200 |
12β | βΉ1300 β βΉ1600 |
π‘ Prices vary based on zinc coating thickness, flange width, and order quantity.
Advantages of GI Flanges in Concrete Structures
- π‘οΈ Zinc coating protects against rust & oxidation
- π© Easily welded or clamped onto MS pipe
- π§± Perfect for embedding in RCC walls and slabs
- π§ Maintains hydraulic seal even under pressure
- π§° 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 β GI Puddle Flanges for Water Retaining Structures
Q1. Can GI puddle flanges be used for potable water tanks?
β Yes. Ensure food-grade zinc coating or epoxy coating for potable water usage.
Q2. Are GI flanges suitable for chemical tanks?
β No. Use SS 316 puddle flanges for chemical resistance in STP or ETP.
Q3. How long does a GI flange last underground?
Typically 10β15 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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