Water Pipe Guide: Types, Specifications and Applications

1Main Types of Water Pipe2Water Pipe Size and Dimensions3What Pressure Can the Water Pipe Handle?4Water Pipe Material Comparison5Water Pipe Coating and Corrosion Protection6Conclusion7FAQ

A water pipe is a pipeline system designed to transport water from sources to residential, commercial, industrial, or agricultural users.

Water pipes are widely used in:

• Municipal water supply systems
• Long-distance water transmission projects
• Industrial water pipelines
• Irrigation systems
• Fire protection systems

Depending on the application, water pipes can be manufactured from carbon steel, ductile iron, HDPE, PVC, stainless steel, and other materials.

Main Types of Water Pipe

Different water pipe materials are selected based on pressure, pipe diameter, corrosion conditions, installation environment, and project requirements.

Steel Water Pipe

Steel water pipe is mainly used for large-diameter and high-pressure water transmission projects. ERW, Lsaw, and SSAW pipes can be selected according to diameter and pressure requirements.

Best for: Long-distance water transmission, municipal infrastructure, and industrial water systems.

Ductile Iron Pipe

Ductile iron pipe is widely used in municipal water distribution networks, especially underground systems requiring high strength and durability.

Best for: Urban water supply and distribution pipelines.

PVC / HDPE Water Pipe

PVC and HDPE pipes are lightweight and corrosion resistant. They are commonly used where flexibility, easy installation, and corrosion resistance are more important than high mechanical strength.

Best for: Underground water distribution, irrigation, and low-to-medium pressure systems.

Stainless Steel Water Pipe

Stainless steel pipe provides excellent corrosion resistance and is suitable for applications with strict hygiene or water quality requirements.

Best for: Food processing, pharmaceutical facilities, and high-purity industrial water systems.

Quick Selection GuidePipe TypeBest ApplicationKey Selection FactorSteel Water PipeLarge transmission pipelinesDiameter and pressureDuctile Iron PipeMunicipal water networksDurability and underground installationPVC / HDPEDistribution and irrigationCorrosion resistance and installation flexibilityStainless SteelHigh-purity water systemsHygiene and corrosion resistanceWater Pipe Size and Dimensions

Water pipe size is mainly defined by outside diameter, wall thickness, nominal size, and pipe length. The required dimensions depend on water flow, operating pressure, installation conditions, and pipe material.

Water Pipe TypeCommon Outside Diameter RangeCommon Wall ThicknessTypical ApplicationSteel Water Pipe21.3–3000+ mm2–30+ mmLarge-diameter water transmission and industrial pipelinesDuctile Iron PipeDN 80–DN 2000Varies by DN and pressure classMunicipal water supply and distributionHDPE Water Pipe20–1600 mmVaries by SDR and pressure ratingUnderground water supply and irrigationPVC Water Pipe20–630 mmVaries by pressure classResidential and municipal distributionStainless Steel Water Pipe6–1200 mm0.5–20 mmIndustrial and high-purity water systemsKey Size Selection Factors

The correct water pipe size should be selected based on:

• Required Flow Rate: Larger diameters provide higher flow capacity.
• Operating Pressure: Higher pressure may require increased wall thickness.
• Pipeline Length: Long-distance pipelines must consider pressure loss.
• Installation Conditions: Underground and above-ground installations may require different structural strength.
• Pipe Material: Different materials use different dimension and pressure classification systems.

For large-scale water transmission projects, pipe diameter and wall thickness should be determined through hydraulic and pressure calculations rather than selected by diameter alone.

What Pressure Can the Water Pipe Handle?

The pressure capacity of a water pipe depends on the pipe material, diameter, wall thickness, manufacturing method, and operating conditions.

For engineering water pipelines, common working pressure ranges are:

Water Pipe TypeTypical Working Pressure RangeCommon ApplicationsSteel Water Pipe1.0–4.0 MPa (10–40 bar)Large-diameter water transmission, industrial water systemsDuctile Iron Pipe1.0–2.5 MPa (10–25 bar)Municipal water supply networksHDPE Water Pipe0.6–2.5 MPa (6–25 bar)Underground water supply and irrigationPVC Water Pipe0.6–1.6 MPa (6–16 bar)Residential and low-pressure water systemsStainless Steel Water Pipe1.0–4.0+ MPa (10–40+ bar)Industrial and high-purity water applications

For large-scale steel water transmission projects, pressure ratings are commonly determined through hydraulic design calculations, pipe stress analysis, and applicable standards rather than diameter alone.

Water Pipe Material ComparisonMaterialAdvantagesApplicationsCarbon SteelHigh strength, large diameter capabilityWater transmission pipelinesDuctile IronDurable and impact resistantMunicipal water networksHDPEFlexible and corrosion resistantUnderground water systemsPVCLightweight and economicalResidential supplyStainless SteelHigh corrosion resistanceIndustrial water systemsWater Pipe Coating and Corrosion ProtectionExternal Coating

• 3PE / 3LPE
• FBE
• Epoxy Coating

Internal Lining

• Cement Mortar Lining
• Epoxy Lining
• Internal Anti-Corrosion Coating

Is the Pipe Suitable for Drinking Water?

For potable water systems, pipe selection requires additional considerations:

• Material safety
• Internal coating approval
• Water quality requirements
• Applicable drinking water standards

Steel water pipes used for drinking water applications usually require certified internal lining systems to prevent contamination and maintain water quality.

Conclusion

Choosing the right water pipe depends on material, size, pressure, and application requirements. For large-scale water projects, steel water pipes offer high strength, durability, and reliable performance.

With professional manufacturing capabilities and quality control, alllandpipes provides steel water pipe solutions with customized sizes, coatings, and inspection support for global water infrastructure projects.

FAQWhat Are the Applications of Water Pipes?

Water pipes are used in municipal water supply, water transmission, irrigation, industrial systems, fire protection, and water treatment projects.

Are Steel Water Pipes Corrosion Resistant?

Yes. With coatings such as 3PE, FBE, or epoxy lining, steel water pipes can provide excellent corrosion protection and long service life.

How Long Does a Steel Water Pipe Last?

A properly designed and protected steel water pipe can typically last 50 years or more, depending on operating conditions and maintenance.

Runfei Steel Group was established in 1998, start with import business. It is a large-scale steel processing and distribution trading company that provides integrated procurement, sales.