The Importance of Choosing the Right Pipe for Water Supply
Water is a critical resource, and the infrastructure used to distribute it must be reliable, safe, and long-lasting. When it comes to selecting the best steel pipe for water supply systems in India, engineers and contractors are often faced with the question: Should I use MS Pipes, GI Pipes, or GP Pipes?
The answer isn’t always straightforward. It depends on multiple factors including exposure to moisture, budget, lifespan expectations, and the nature of the application. This blog, created in collaboration with Asian Steels—a premier manufacturer of steel pipes in India based in Ahmedabad, Gujarat—provides a technical, practical comparison of the three leading pipe types.
By understanding the structural properties, corrosion resistance, and application scope of MS Pipes, GP Pipes, and GI Pipes, professionals can make informed decisions for water supply projects across construction, municipal, industrial, and infrastructure sectors.
Understanding the Pipe Types: MS, GI, and GP
MS Pipes (Mild Steel Pipes)
MS Pipes are manufactured from low-carbon steel and are usually supplied in a black finish (also known as black steel). They are structurally strong and cost-effective, making them a popular choice for non-critical applications where corrosion is not a major concern.
Advantages:
- Lower cost compared to coated alternatives
- Good mechanical strength and weldability
- Easily available in various sizes and thicknesses
Limitations:
- No protective coating; susceptible to rust
- Not suitable for long-term exposure to water or humidity
Best suited for:
- Temporary lines
- Enclosed systems where no moisture exposure occurs
Related product: MS ERW Black Pipe
GI Pipes (Galvanised Iron Pipes)
GI Pipes are steel pipes that have been coated with a protective layer of zinc through galvanisation. This layer acts as a barrier against corrosion, extending the life of the pipe, especially in moist and wet environments.
Advantages:
- Superior corrosion resistance due to zinc coating
- Suitable for potable water and plumbing
- High longevity in outdoor and underground applications
Limitations:
- Slightly higher cost compared to MS Pipes
- Welding should be done with care to avoid zinc fume hazards
Best suited for:
- Domestic and industrial water supply
- Municipal water infrastructure
- Outdoor and underground pipelines
Top products: MS ERW GI Pipe, GI Square and Rectangular Steel Pipes
GP Pipes (Galvanised Plain Pipes)
GP Pipes are manufactured using cold-rolled steel (CRCA) which is then galvanised to offer moderate corrosion resistance. These pipes have excellent surface finish and dimensional accuracy.
Advantages:
- Clean appearance; better finish than GI Pipes
- Reasonable corrosion resistance
- Ideal for aesthetic and semi-structural use
Limitations:
- Not recommended for continuous contact with water
- Less corrosion-resistant than GI in fully exposed or immersed settings
Best suited for:
- Indoor plumbing frames
- Semi-exposed support structures
- Light water drainage (non-potable)
Related products: GP Round Steel Pipe, GP Square & Rectangular Steel Pipes
Key Evaluation Criteria for Water Supply
Choosing the best pipe for water distribution involves a careful assessment of key factors. Let’s examine each:
1. Corrosion Resistance
Corrosion is the number one enemy of water supply pipelines, especially in India’s varied climate zones.
- MS Pipes: No corrosion resistance unless painted; susceptible to early rust and pipe failure.
- GP Pipes: Zinc coating provides mild protection but not ideal for long-term water exposure.
- GI Pipes: Best-in-class for corrosion resistance; ideal for regions with high humidity or rain.
2. Expected Service Life
The average service life of the pipe can dictate long-term cost and maintenance frequency.
- MS Pipes: 2–5 years depending on environment.
- GP Pipes: 5–8 years in dry, sheltered conditions.
- GI Pipes: 15–20+ years with proper maintenance.
3. Structural Integrity and Strength
All three pipe types are made from steel, ensuring good base strength, but their application tolerances vary.
- MS Pipes: Excellent structural strength, commonly used in frames and supports.
- GP Pipes: Moderate strength, used in furniture, light framing, and low-load applications.
- GI Pipes: Offers a mix of strength and corrosion resistance, suitable for structural water transport.
4. Maintenance and Lifecycle Costs
- MS Pipes: Require regular painting and inspections; highest maintenance.
- GP Pipes: Moderate maintenance in dry settings.
- GI Pipes: Low maintenance over time, especially when installed properly.
5. Cost-Effectiveness
- MS Pipes: Cheapest initial cost but high maintenance and early replacement.
- GP Pipes: Mid-range cost with limited water use.
- GI Pipes: Highest initial cost but lowest lifecycle cost in water applications.
Recommended Pipe for Water Supply in India
Why GI Pipes Are the Industry Standard for Water
GI Pipes are consistently used for water supply because they:
- Prevent rust in contact with water
- Do not contaminate potable water
- Withstand outdoor and underground installation conditions
As an experienced steel pipe manufacturer in Gujarat, Asian Steels provides high-quality GI solutions including:
- MS GI Pipes for general-purpose and municipal supply lines
- GI Square Pipes for projects needing both strength and corrosion protection
GI Pipes are used extensively in:
- Government water infrastructure
- Residential building plumbing
- Borewell and pump connections
- Agricultural irrigation systems
Situational Use of MS and GP Pipes in Water Systems
While GI Pipes are the top recommendation, MS and GP Pipes may be used strategically:
MS Pipes: Short-Term or Enclosed Installations
Use MS Pipes when:
- The pipe is temporary (e.g., site water distribution during construction)
- The line runs through enclosed, dry locations
- Budget constraints require short-term, low-risk solutions
GP Pipes: Aesthetic or Semi-Exposed Non-Critical Use
GP Pipes are useful when:
- Pipes are part of architectural designs
- Pipes are not continuously carrying water
- Used for support frames rather than actual water transport
For example:
- Decorative plumbing shrouds
- Rooftop frames with occasional rain exposure
- Indoor mechanical rooms where appearance and moderate durability are desired
Project Example: Water Supply for a Multi-Storey Apartment Complex
Asian Steels recently supported a residential tower in Gujarat. The breakdown:
- Main vertical water lines: GI Pipes were used for outdoor and exposed supply lines from rooftop tanks.
- Pump room headers: GP Pipes were used to support plumbing accessories inside the mechanical room.
- Temporary water bypass: MS Pipes were used during early construction for site hydration systems.
Such combinations allow for smart material use—balancing performance, cost, and technical needs.
Why Choose Asian Steels for Water Supply Pipe Needs
Asian Group of Companies is a leading industrial steel pipe company that understands the nuances of water distribution systems in India. Here’s why clients trust Asian Steels:
- Full in-house manufacturing of MS, GI, and GP Pipes
- Controlled galvanising process ensuring coating thickness and consistency
- Product traceability for compliance with municipal and government projects
- Quick dispatch capabilities from Ahmedabad, Gujarat to major Indian cities
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