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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Valves for Chemical Industry: Corrosion Resistance & Material Selection

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Valves in the chemical industry face aggressive fluids, high pressures, and extreme temperatures. Choosing the right valve with corrosion-resistant materials is critical for safety, efficiency, and long service life in chemical processing plants.



Chemical industry valves must resist corrosion, abrasion, and temperature extremes. Ideal materials include stainless steel, Hastelloy, PTFE-lined, and alloy 20. Common valves used are globe, diaphragm, ball, and plug valves, chosen based on fluid type, temperature, and flow control needs.

Common Valve Types for Chemical Applications

Valve TypePurpose in Chemical PlantsKey Feature
Ball ValveOn/off control for corrosive liquidsPTFE-lined or SS body
Diaphragm ValveSlurries and corrosive chemicalsNo internal leakage, non-metal contact
Plug ValveThick fluids, acids, and viscous chemicalsLined body, compact design
Globe ValveFlow regulation in critical systemsHigh precision, corrosion-resistant trim
Butterfly ValveLarge volume, low-pressure chemical flowPTFE-lined disc, fast shutoff
Check Valve (NRV)Prevent backflow in chemical dosing linesCorrosion-resistant seat and disc

 Corrosion-Resistant Materials: A Quick Comparison

MaterialBest ForWhy Use It
Stainless Steel (316/316L)General chemical resistanceResists acids, alkalis, and solvents
Hastelloy C-276Strong oxidizers, chloride mediaExcellent in aggressive chemical services
PTFE (Teflon)Non-metallic, chemical inertnessIdeal for acid and alkali handling
Alloy 20Sulfuric acid and harsh chemicalsResistant to pitting and stress corrosion
PVC/CPVCLight-duty corrosive applicationsLow cost, non-conductive

🧪 Valve Selection Tips for Chemical Applications

  1. Know Your Media

    • Acids, alkalis, oxidizers? Select material accordingly.

  2. Consider Lining

    • Use PTFE, FEP, or PFA linings for enhanced protection.

  3. Check Temperature & Pressure Ratings

    • Match valve specs with chemical plant operating conditions.

  4. Maintenance Access

    • Choose valves with easy serviceability for high-wear areas.

  5. Compliance

    • Prefer valves conforming to API, ANSI, or ASME standards.

✅ Typical Chemical Industries Using Specialized Valves

  • 🧴 Petrochemical Plants

  • 🧪 Fertilizer & Pesticide Factories

  • 🌿 Pharmaceutical Manufacturing

  • ⚗️ Acid Processing Units

  • 🌊 Effluent Treatment Plants

 FAQ

Q1. What type of valve is used for corrosive chemicals?

Diaphragm valves and PTFE-lined ball or plug valves are best suited for corrosive chemicals due to minimal metal contact.

Q2. What is the most corrosion-resistant valve material?

Hastelloy C-276 and PTFE linings offer the highest corrosion resistance in aggressive environments.

Q3. Can stainless steel valves be used in chemical industries?

Yes, 316/316L stainless steel valves are widely used but may not be suitable for strong acids like HCl or HF.

Q4. What valves are used in acid handling?

Use PTFE-lined plug or diaphragm valves for handling acids, as they resist acid attack and leakage.

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