Introduction
In the piping and industrial manufacturing industries, fittings play a crucial role in ensuring efficiency, durability, and safety. Among these, reducers are highly important as they allow the connection of pipes of different diameters. When it comes to mild steel (MS) piping systems, the MS Eccentric Reducer is widely used due to its strength, affordability, and versatility.
This guide will cover everything you need to know about MS eccentric reducers, including their definition, design, manufacturing, applications, and advantages.
What is an MS Eccentric Reducer?
An MS Eccentric Reducer is a type of pipe fitting used to connect two pipes of different diameters while maintaining one side of the fitting flat. Unlike concentric reducers, which are symmetrical, eccentric reducers are asymmetrical – one side remains aligned while the other side is offset.
This design helps in preventing air accumulation and maintaining proper fluid flow, especially in horizontal piping systems.
Key Features of MS Eccentric Reducer
Material: Made from mild steel, offering strength and durability at an affordable cost.
Design: One flat side and one slanted side to avoid air pockets.
Size Range: Available in multiple diameters as per piping requirements.
End Connection: Buttweld type for a secure and leak-proof joint.
Standards: Manufactured as per ANSI, ASME, DIN, and other industrial standards.
Manufacturing Process of MS Eccentric Reducer
Selection of Material – High-quality mild steel is chosen.
Hot Forming or Cold Forming – Steel is shaped using presses or hydraulic machines.
Heat Treatment – To enhance strength and remove stresses.
Machining – For precise dimensions and smooth finish.
Inspection & Testing – Checked for durability, leak resistance, and compliance with standards.
Surface Treatment – Anti-rust coating or galvanization (if required).
Difference Between Eccentric and Concentric Reducers
| Feature | Eccentric Reducer | Concentric Reducer |
|---|---|---|
| Shape | One side flat | Symmetrical (cone-shaped) |
| Flow | Prevents air pockets | May allow air accumulation |
| Application | Horizontal piping | Vertical piping |
| Cost | Similar | Similar |
| Use Case | Pump suction lines, process piping | Vertical pump discharge lines |
Applications of MS Eccentric Reducer
MS eccentric reducers are widely used in industries where smooth fluid transfer and efficient piping layouts are essential. Common applications include:
Oil & Gas Industry – For safe transportation of crude oil, natural gas, and refined products.
Chemical Plants – Handling corrosive and non-corrosive liquids.
Water Supply Systems – Municipal and industrial water distribution.
Power Plants – Cooling water lines, steam lines, and condensers.
Food & Beverage Industry – Process pipelines requiring hygiene and smooth flow.
HVAC Systems – For chilled water and heating water circulation.
Pharmaceutical Industry – In process piping with controlled environments.
Advantages of Using MS Eccentric Reducer
Cost-Effective – Mild steel is more affordable than stainless steel or alloy steel.
Prevents Air Pockets – Especially beneficial in horizontal pipelines.
Strong & Durable – Capable of withstanding high pressure and temperature.
Versatile – Suitable for multiple industries and applications.
Easy Welding – Buttweld connection ensures leak-proof performance.
Availability – Readily available in different sizes and standards.
Customization – Can be fabricated based on customer specifications.
Why Choose Mild Steel (MS) for Eccentric Reducers?
Mild steel is widely preferred because:
It is affordable compared to stainless steel.
It offers excellent weldability, making installation easy.
It has good mechanical strength to withstand industrial conditions.
It can be coated or galvanized for enhanced corrosion resistance.
Technical Specifications of MS Eccentric Reducer
Material Grade: IS 1239, IS 3589, ASTM A234 WPB (commonly used).
Size Range: ½” NB to 48” NB.
Thickness: SCH 20 to SCH 160, XXS.
End Type: Buttweld (most common), Socket Weld, or Threaded (customized).
Standards: ASME B16.9, MSS-SP-75, DIN, JIS.
Installation Guidelines
To ensure proper performance of MS eccentric reducers:
Install the flat side at the bottom in horizontal lines carrying liquids to prevent air pockets.
Install the flat side at the top in horizontal lines carrying gases to avoid liquid accumulation.
Ensure proper alignment before welding.
Perform hydrostatic and pneumatic tests after installation.
MS Eccentric Reducer Price in India
The price of an MS eccentric reducer depends on:
Size and thickness
Material grade
Manufacturing standard
Quantity ordered
Market steel price fluctuations
On average, MS eccentric reducer prices range from ₹100 to ₹5,000 per piece depending on the size and specifications. For bulk orders, manufacturers often provide discounts.
Quality Standards & Testing
To ensure durability and safety, MS eccentric reducers undergo several quality checks:
Hydrostatic Testing – To check for leakage.
Non-Destructive Testing (NDT) – For cracks or deformities.
Dimensional Inspection – To ensure compliance with standards.
Surface Finish Check – To prevent rust and corrosion.
Maintenance of MS Eccentric Reducers
Although mild steel is durable, proper maintenance increases lifespan:
Apply anti-corrosion paint or coating.
Inspect periodically for wear, cracks, or rust.
Ensure proper lubrication in connected piping systems.
Replace if significant thinning or leakage is observed.
MS Eccentric Reducer vs Stainless Steel Eccentric Reducer
| Parameter | MS Eccentric Reducer | SS Eccentric Reducer |
|---|---|---|
| Cost | Affordable | Expensive |
| Corrosion Resistance | Moderate (requires coating) | High |
| Durability | Long-lasting with maintenance | Extremely long-lasting |
| Applications | General industry, water, oil, HVAC | Pharma, food, high-purity industries |
How to Select the Right MS Eccentric Reducer?
When selecting, consider:
Pipe diameter difference
Flow type (liquid or gas)
Pressure and temperature rating
Material grade requirement
Standard compliance (ASME/DIN/IS)
Budget constraints
Future of MS Eccentric Reducers in Industry
With increasing demand in infrastructure, power plants, and oil & gas industries, the use of MS eccentric reducers is expected to grow steadily. Advancements in manufacturing and coating technologies will further improve their efficiency and corrosion resistance.
FAQs About MS Eccentric Reducer
Q1. What is the main purpose of an eccentric reducer?
To connect pipes of different diameters while preventing air or liquid pockets in horizontal lines.
Q2. Where should an eccentric reducer be installed?
In horizontal pipelines – flat side bottom for liquids and flat side top for gases.
Q3. Is mild steel a good material for reducers?
Yes, it is cost-effective, strong, and durable, making it ideal for general industrial use.
Q4. What is the difference between MS and SS eccentric reducers?
MS is affordable and strong but requires coating, while SS is corrosion-resistant but more expensive.
Q5. What are the available sizes of MS eccentric reducers?
They are available from ½” NB to 48” NB with different wall thicknesses.
Conclusion
The MS Eccentric Reducer is a critical component in piping systems, ensuring smooth flow, safety, and efficiency. Its ability to prevent air pockets makes it indispensable in horizontal pipelines. With advantages such as affordability, durability, and availability in multiple sizes, MS eccentric reducers are a preferred choice across industries.
Whether you are in oil & gas, chemical processing, water supply, or power generation, choosing the right MS eccentric reducer ensures long-lasting performance and operational efficiency.