In modern pipeline infrastructure, HDPE pipes have become a top choice due to their durability, corrosion resistance, and flexibility. Among the different types available, SDR 11 HDPE pipes with flange connections are widely used in water systems, industrial fluid transfer, and municipal projects. This article serves as a comprehensive guide for international buyers looking to source HDPE SDR 11 pipes with flange fittings.
What Is SDR 11 HDPE Pipe?
SDR (Standard Dimension Ratio) refers to the ratio between the pipe’s outer diameter and its wall thickness. SDR 11 pipes have a thicker wall and therefore can withstand higher internal pressures—typically up to 16 bar (230 psi) depending on material and standards.
SDR 11 HDPE pipes are ideal for high-pressure applications, such as:
Potable water supply
Industrial chemical transfer
Wastewater treatment systems
Irrigation networks
Key advantages include long service life, leak-free performance, and high resistance to corrosion and abrasion.
Understanding Flanged HDPE Pipe Connections
Flange connections are a mechanical joining method that allows quick assembly and disassembly of HDPE pipelines. This connection style uses:
Stub Ends (HDPE or steel)
Backing Rings (usually carbon steel or stainless steel)
Bolts and Gaskets
Benefits of flanged connections:
Easy installation and removal
Ideal for pipeline sections that require frequent maintenance
Convenient connection with valves, pumps, and metal pipelines
Strong and stable under pressure when correctly aligned
Compared to butt fusion or electrofusion joints, flange connections are more suitable for above-ground or mechanical systems where accessibility matters.
HDPE Pipe Supply Options – Sizes, Standards, and Availability
When sourcing SDR 11 HDPE pipes with flange fittings, buyers can expect the following specifications:
Available Diameters: From 63mm up to 630mm (and larger upon request)
Lengths: 6 meters and 12 meters for straight pipes, or coiled lengths for small diameters
Color: Black with blue stripes (for water), black with red/yellow (for gas or mining)
Standards: ISO 4427, DIN 8074, ASTM D3035, EN 12201
Pipes can be pre-welded with stub ends and flange rings before shipping, depending on project needs.
Selecting the Right Flange Fittings for SDR 11 Pipes
Flange fittings play a critical role in maintaining pipeline integrity. Key factors to consider include:
Flange Type: Stub end + backing ring (most common), integral flange for special designs
Material:
Stub ends: HDPE
Backing rings: Galvanized carbon steel or stainless steel (SS304/SS316)
Pressure Class: PN10, PN16, ANSI 150, etc., must match the SDR 11 pipe pressure rating
Size Matching: Pipe OD must align with flange dimensions and drilling standards (e.g., EN 1092, ANSI)
Ensure all flange components come from trusted sources to prevent misalignment or pressure failure.
Applications of SDR 11 HDPE Pipes with Flanged Connections
The combination of SDR 11 wall thickness and flange joints makes these pipes perfect for:
Municipal water systems – Water intake and distribution
Industrial pipelines – Chemical handling and cooling water
Mining projects – Slurry and waste material transportation
Pumping stations – Easy access for maintenance
Agricultural irrigation – Main lines in irrigation networks
The versatility of flanged connections ensures compatibility with metal fittings, valves, and flow meters.
Procurement and Supply Considerations
Before placing your order, here are some key purchasing details:
Minimum Order Quantity (MOQ): Usually 500–1000 meters depending on diameter
Lead Time: 7–20 days based on production schedule and customization
Packaging: Bundled with PE film, wooden supports, or container loading
Customization: Pre-fabricated flanged ends, custom pipe color, or OEM branding available
Shipping Terms: EXW, FOB, CIF, or DDP (based on destination and buyer preferences)
Make sure your supplier provides pressure test certificates and complies with international standards.
HDPE SDR 11 pipes with flange connections offer a reliable, high-pressure solution for a wide range of piping projects. Their ease of installation, flexibility in design, and long-term performance make them an ideal choice for infrastructure upgrades and industrial applications.
When sourcing these products, work with experienced manufacturers who offer technical support and quality assurance throughout the procurement process.
FAQ
1. What’s the maximum pressure SDR 11 HDPE pipe can handle?
Typically up to 16 bar (PN16), but always verify with the specific pipe standard.
2. Can flange connections be used underground?
They can be, but are better suited for above-ground installations where accessibility is required.
3. Are HDPE flange joints reusable?
Yes, the flange rings and bolts are reusable, though the gasket may need replacement.
4. How do I ensure correct flange alignment?
Use proper tools during installation and follow alignment standards. Misalignment may cause leakage under pressure.
5. Can HDPE pipe be connected to metal pipes using flanges?
Yes. Flanged joints are ideal for transitions between HDPE and metal systems.
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