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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Complete Guide to Seamless GI Pipes: Sizes, Threads & S&S Type

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 What Are Seamless GI Pipes?

Seamless GI pipes are galvanized iron pipes without any weld seam, providing high strength and pressure resistance. These pipes are hot-dip galvanized with a zinc coating and are ideal for plumbing, fire-fighting systems, industrial gas pipelines, and water distribution networks.

πŸ“ Standard Size Chart for Seamless GI Pipes

Nominal Bore (NB)Outer Diameter (OD)Wall Thickness Range (mm)Common TypeAvailability
15mm (½”)21.3 mm2.0 – 2.6 mmS&S / Plain / ThreadedWidely Available
25mm (1”)33.4 mm2.6 – 3.25 mmS&S / Plain EndIS:1239 / IS:3589
40mm (1½”)48.3 mm3.25 – 4.0 mmS&S / ThreadedIndustrial Use
65mm (2½”)76.1 mm3.65 – 4.5 mmPlain / S&S OptionalBulk Applications
80mm (3”)88.9 mm4.0 – 5.4 mmPlain End / ThreadedHigh Pressure Lines
100mm (4”)114.3 mm4.5 – 6.0 mmPlain / S&SCustom Orders

✔️ Compliant with IS:1239 (Part I) or IS:3589 standards based on pressure and size.

πŸ”§ Threading Standards for Seamless GI Pipes

πŸ”© Types of Threads:

Thread TypeStandardUse Case
BSPT (British)IS:554Plumbing, sprinkler systems
NPT (American)ANSI B1.20.1Compressed air, oil, gas lines
Metric ThreadDIN 13Export/custom industrial connections

πŸ“ Thread Details by Size:

NB SizeThread per Inch (TPI)Thread Length (approx.)
15mm1413–14 mm
40mm1120 mm
80mm828–30 mm

πŸ”© Screwed & Socketed (S&S) GI Pipes – Explained

S&S GI Pipes come with threaded ends and GI sockets pre-fitted. No welding is required.

⚙️ Benefits of S&S Pipes:

  • Ready to install

  • No need for on-site threading

  • Leak-proof joints using Teflon tape or pipe sealant

  • Ideal for temporary or portable systems

πŸ”§ S&S vs Plain-End Comparison:

FeatureS&S TypePlain-End
Threaded EndsYesNo
Socket AttachedYes (GI socket pre-fitted)No
InstallationQuick, no welding neededRequires welding or flange connection
ApplicationsWater lines, temporary structuresGas lines, heavy-duty fabrication

🏭 Industrial Applications of Seamless GI Pipes

  • πŸ”₯ Firefighting systems (sprinkler networks)

  • πŸ—️ Civil infrastructure water & drainage

  • 🏒 High-rise plumbing

  • 🚜 Agricultural irrigation

  • ⚡ Conduit for electrical & telecom cables

  • πŸ› ️ Compressed air and gas transfer lines

πŸ›‘️ Key Features & Advantages

  • No seam = No risk of leakage

  • Zinc coating prevents corrosion in wet or saline environments

  • Long operational life (15–30 years)

  • Suitable for underground and exposed installations

  • Withstands high working pressure (up to 40–50 bar depending on size/thickness)

🧾 Buying Tips for Seamless GI Pipes

  1. Confirm IS specification: IS:1239 for small bore, IS:3589 for large diameter.

  2. Ask for mill test certificate (MTC) to verify seamless construction.

  3. Clarify S&S or Plain End requirement.

  4. Check zinc coating thickness: Ideally 80–100 microns.

  5. Choose threading type as per system compatibility.

🏷️ Price Estimate in India (as of 2025)

Size (NB)Price/Metre (INR)Type
40mm₹195 – ₹230Seamless S&S
80mm₹360 – ₹410Seamless Plain
100mm₹470 – ₹550Seamless Plain

πŸ“ Prices vary based on zinc coating, brand, and quantity.

🏒 Top Manufacturers & Brands

BrandSpecializationRegion
Jindal (Hisar)Seamless GI, Heavy-duty S&SNorth India
Surya RoshniHot-dip galvanized seamless pipesPan-India
Tata PipesISI-certified GI piping solutionsNationwide
Maharashtra SeamlessOil & gas-grade seamless GI pipesWestern India

πŸ“ˆ Backlink & SEO Strategy

  • Internal Links:
    → [ERW Pipe vs GI Pipe – What’s Better for Pressure Use?]
    → [Top GI ERW Pipe Manufacturers in India]

  • External Authority Links:

  • GMB Optimization:
    Dealers should target:
    “Seamless GI Pipe 40mm Supplier in Delhi”, “Threaded GI Pipe Wholesalers Near Me”

❓FAQs

Q1: Can seamless GI pipes be used for drinking water lines?
✅ Yes, provided the zinc coating meets potable water standards.

Q2: Is S&S type better than welding?
For ease of installation and non-permanent setups—yes. For high-stress systems, welding may be preferred.

Q3: How long does GI coating last underground?
Typically 10–20 years depending on soil condition and coating thickness.

Q4: Can I request NPT threads on Indian GI pipes?

Yes, if specified during procurement for export or system compatibility. 

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