Carbon Steel Pipe for Water Supply

Carbon steel pipes (CS pipe) for water supply refer to steel pipes used for water supply, usually made of carbon steel, and mainly used for transporting tap water, industrial water, and agricultural irrigation water.

Carbon steel is an iron-carbon alloy with a carbon content typically below 2%, containing small amounts of other elements. Compared to pure iron, carbon steel has higher strength and hardness. However, carbon steel itself has limited corrosion resistance; therefore, carbon steel pipes for water supply generally have protective coatings (such as epoxy resin, cement mortar, etc.) applied to their inner and outer surfaces to effectively isolate the water body, prevent the steel pipe from rusting, thus avoiding secondary water pollution and allowing them to withstand the effects of high-pressure water flow and low temperatures. Coated carbon steel pipes combine good corrosion resistance, high pressure resistance, reliable structural strength, and relatively simple installation and maintenance.

Typical manufacturing processes for carbon steel pipes for water supply include: 

Heating carbon steel plates to a plastic state, then rolling them into a tubular shape and welding them (e.g., forming spiral welded steel pipes); then spraying or centrifugally casting an anti-corrosion coating on the inner and outer walls of the pipe; finally, cooling, curing, and necessary subsequent processing.

When using carbon steel pipes for water supply, you need to pay attention to the following points:

1. During installation, attention should be paid to maintaining a safe distance from the pipeline to avoid collision with other pipelines or obstacles;
2. Perform regular pipeline cleaning and maintenance to ensure clean water quality and normal operation of pipelines;
3. Water supply pipelines that have not been used for a long time should be drained to avoid the growth of bacteria and scale in the pipelines;
4. When welding or other processing, attention should be paid to the material and performance of the pipe to avoid excessive heating or excessive stress;

5. During transportation and storage, carbon steel pipes should be avoided from colliding or extruding with other items to avoid damaging the pipe surface.

Long-lasting Corrosion Resistance, Safe Water Delivery: High-Performance Carbon Steel Water Supply Pipe Solutions

Does your water supply pipeline face these challenges?

● Pipe corrosion leading to "yellow water" pollution.
● Insufficient pressure resistance, posing a risk of pipe bursts.
● Short service life, frequent replacements, and high overall costs.
● Poor reliability in complex environments (e.g., low temperatures, highly corrosive soil).

Hunan Standard Steel Co., Ltd (HSCO) specializes in producing carbon steel water supply pipes using advanced coating technology. These pipes combine superior strength with excellent corrosion resistance, helping municipal, industrial, and agricultural water supply projects reduce costs and increase efficiency.

Why Choose Our Carbon Steel Water Supply Pipes?

1. Superior Corrosion Resistance: HSCO's water supply pipes are manufactured in strict accordance with the technical standards for internal and external coatings (e.g., epoxy resin/cement mortar) required by pipeline corrosion protection specifications: coating thickness and adhesion requirements. Relevant sanitary permits can be provided to ensure water purity (e.g., drinking water contact material certification).

2. Strong Structural Performance: HSCO's carbon steel water supply pipes possess high pressure resistance and deformation resistance, making them suitable for long-distance, high-drop water transportation. Pressure rating and specification range data sheets are available.

3. Long Service Life and Economic Benefits: Compared to other materials (such as some plastic pipes and uncoated steel pipes), corrosion-resistant carbon steel water supply pipes offer advantages in terms of low maintenance costs and economical total cost of ownership.

4. Convenient Construction Adaptability: Carbon steel pipes offer various connection methods (pipe welding, flange connection), facilitating convenient construction and high installation efficiency, and can handle various complex terrains.

Carbon Steel Water Supply Pipe Product Specifications and Selection Guide:

HSCO offers two main product categories to meet different working conditions and budget requirements:

a. Epoxy Coating Series

The inner wall is coated with high-performance epoxy resin powder, and the outer wall is coated with epoxy coal tar pitch or double-layer fusion-bonded epoxy (FBE). High corrosion resistance, low hydraulic friction, and excellent water quality assurance.

Recommended application scenarios: Municipal main water supply networks, high-quality industrial high-pressure water, direct drinking water projects with strict water quality requirements, and highly corrosive soil environments.

b. Cement Mortar Lining Series

The inner wall is a centrifugally cast cement mortar layer, with external anti-corrosion treatment (such as epoxy coal tar). Economical and practical, with good inner wall stability, it can maintain the pipeline's water delivery capacity for a long time.

Recommended application scenarios: Large-diameter water transmission and distribution pipelines, raw water transportation in large water plants, circulating water systems, long-distance agricultural irrigation main pipelines, and projects prioritizing cost-effectiveness.

1. Common Specifications for Carbon Steel Water Pipe

Material: American standard ASTM A53 Gr.B, A106 Gr.B, etc., or Chinese standard carbon structural steel such as Q235B, Q355B, etc., are provided upon request.
Manufacturing process: Spiral submerged arc welded steel pipe (SSAW), straight seam resistance welded steel pipe (ERW), or straight seam submerged arc welded steel pipe (LSAW). 

Diameter range (DN): Φ219mm - Φ3620mm (non-standard customization available).
Wall thickness range: 6mm - 25mm, determined based on design pressure calculations.
Single length: Typically 6m, 9m, 12m, customizable according to transportation and construction conditions.

2. Water Supply Steel Pipe Coating Requirements

Coating Type	Internal Coating Standard and Thickness	External Coating Standard and Thickness	Reference Standards
Epoxy Resin Internal Coating	Liquid Epoxy/Epoxy Powder, ≥250μm	Double-Layer FBE/Epoxy Coal Tar, ≥400μm	AWWA C210, GB/T 18593
Cement Mortar Lining	Thickness: 6-12mm (depending on pipe diameter)	Epoxy Coal Tar/Thick-Layer Epoxy, ≥300μm	AWWA C205, GB/T 17456
External Corrosion Protection Reinforced Grade	-	Three-Layer PE (3PE) Corrosion Protection, Total Thickness ≥2.5mm	DIN 30670, GB/T 23257

3. Pressure Rating

Standard products cover PN0.6MPa, PN1.0MPa, PN1.6MPa, PN2.5MPa.
Maximum working pressure can be customized according to wall thickness and material, reaching 4.0 MPa and above.
All pipelines undergo 100% hydrostatic pressure testing before leaving the factory, with a test pressure 1.5 times the nominal pressure to ensure absolute safety.

Factors to Consider in Selection Decisions:

1. Define Requirements

a. Transport medium: Tap water, raw water, industrial circulating water, irrigation water?
b. Design pressure and fluctuation range: What is the maximum working pressure? Is water hammer present?
c. Environmental conditions: How corrosive is the buried soil? Does it traverse special areas such as swamps or saline-alkali land?
d. Water quality requirements: Are there any special sanitary standards?
e. Project budget and lifespan: Expected service life (e.g., 30 years, 50 years)? Is initial cost or total life cycle cost prioritized?

2. Match Pipe Coating Type

Epoxy coating series is preferred: If you have extremely high requirements for water quality safety, long-term low maintenance, and chemical corrosion resistance.
Preferred Cement Mortar Series: Ideal for projects with large diameters, high flow rates, long-term scaling control requirements, and optimal cost-effectiveness.

3. Determine Key Parameters

Diameter (DN): Calculated based on design flow rate and velocity.
Wall Thickness: Calculated using formulas or with the assistance of our engineers, based on design pressure, safety factor, pipe burial depth, and external load.
Length: Consider transportation limitations (truck, sea) and on-site installation convenience.

4. Confirm Additional Services

Connection Method: Are matching flanges, sockets, or weld bevels required?
On-site Support: Is on-site installation guidance from a technician required?
Special Certifications: Are specific third-party inspection reports or certifications required?

In short, carbon steel pipe for water supply is a pipe material with economical, reliable, excellent performance, easy to install and maintain, and is widely used in tap water supply, industrial production, agricultural irrigation and other fields. During use, attention needs to be paid to the safety and normal operation of the pipelines, and regular maintenance and upkeep is required to ensure the cleanliness of the water quality and the service life of the pipelines.

We understand that every project is unique. The above guidelines are for general reference. The most reliable selection comes from direct communication with you: info@hu-steel.com. Choosing us is not just choosing a product, but also choosing a reliable technical partnership.

Read more: ANSI/AWWA C200 Steel Water Pipe or Packaging Methods of Anti-corrosion Spiral Steel Pipes