Choose SDR11 when your design requires a higher pressure rating or a thicker wall for the same pipe outside diameter; choose SDR17 when its lower pressure class meets the project design and a thinner wall is suitable. For PE100 pipe carrying water at 20°C, a common reference pairing is SDR11 at PN16 and SDR17 at PN10, subject to the applicable standard and design conditions. These nominal ratings are not universal guarantees: material grade, temperature, design coefficient, fluid, and local requirements all affect the allowable operating pressure. Before ordering, confirm the project’s required pressure class and the exact pipe standard with the design team.
SDR means Standard Dimension Ratio. It is calculated by dividing a pipe’s nominal outside diameter by its nominal wall thickness, so a lower SDR corresponds to a thicker wall relative to the pipe diameter. As a result, SDR11 has a thicker wall than SDR17 when both pipes have the same outside diameter. The SDR number describes the pipe’s dimensions; it is not, by itself, a complete pressure rating.
For a given material grade and design basis, a thicker wall generally allows a pipe to withstand greater internal pressure. A commonly used relationship for thermoplastic pressure pipes is MOP = 2 × MRS ÷ [C × (SDR − 1)], where MOP is maximum operating pressure, MRS is minimum required strength, and C is the design coefficient. The formula helps explain why SDR11 is commonly rated above SDR17, but the project’s governing standard and product data must be checked before using a rating for design.
For illustration, using PE100 with an MRS of 10 MPa and a design coefficient of 1.25 gives a calculated pressure of 1.6 MPa for SDR11 and 1.0 MPa for SDR17. These convert to 16 bar and 10 bar, respectively, and are commonly shown as PN16 and PN10 for water at 20°C under the relevant assumptions. Treat these figures as reference values, not as a substitute for checking the manufacturer’s datasheet, applicable standard, operating temperature, and service conditions.
| Consideration | SDR11 | SDR17 |
|---|---|---|
| Wall thickness at the same outside diameter | Thicker | Thinner |
| Typical PE100 water reference at 20°C | Commonly PN16 | Commonly PN10 |
| Internal bore at the same outside diameter | Smaller | Larger |
| Typical selection consideration | Higher pressure requirement or greater wall thickness needed | Pressure requirement met with a thinner wall and suitable design conditions |
| Key checks before purchase | Material grade, pipe standard, temperature, pressure including surge, connection method, and project specifications | |
The table compares typical characteristics, not every product configuration. For the same outside diameter, SDR17’s thinner wall can provide more internal diameter, but actual flow performance also depends on pipe size, flow rate, fluid properties, and system design. A higher PN marking should not be assumed unless the material grade and rating basis are confirmed. Ask for documentation that identifies the product’s dimensions, material, and declared pressure class.
SDR11 is a candidate when the calculated operating pressure, including applicable allowances for pressure surges, exceeds the capacity of an SDR17 option but remains within the SDR11 product rating. Buyers may also specify SDR11 where the project requires a thicker wall or where the design documents explicitly call for that dimension series. It is used in pressure-pipe applications such as water distribution and other compatible fluid systems, provided the pipe material and approvals suit the conveyed medium. The final choice must follow the project engineer’s calculations and local requirements.
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SDR17 can be suitable where its verified pressure rating covers the full operating envelope and the design permits a thinner wall. At the same outside diameter, its larger bore may be relevant to hydraulic sizing, although it does not automatically mean lower system cost or better performance. It may also be considered when the project specification calls for SDR17 and the operating temperature, surge conditions, and installation conditions remain within the product’s declared limits. Do not select it solely because its wall is thinner or its initial price appears lower.
SDR11 typically uses more material than SDR17 at the same outside diameter because its wall is thicker, but the final quoted price depends on pipe size, resin grade, order quantity, production requirements, and delivery terms. A thinner-wall option is not automatically the lower-cost choice after considering fittings, hydraulic requirements, and project compliance. Request comparable quotations that state the same outside diameter, material grade, standard, quantity, and delivery scope. This makes supplier offers easier to evaluate on an equivalent basis.
Before placing an order, confirm minimum order quantities, available sizes, production and delivery schedules, packing requirements, and the documents supplied with the shipment. These details can vary by manufacturer and order specification, so they should be confirmed directly rather than assumed. For project-based procurement, send the supplier the operating pressure, design pressure, fluid, temperature, pipe size, applicable standard, and delivery destination. Clear inputs help the supplier assess the requested configuration and identify missing information before quotation.
JM Group supplies HDPE pressure pipe solutions for B2B projects and can review the specification information you provide for an SDR11 or SDR17 quotation. To support a useful technical and commercial response, share the required outside diameter, material grade, pressure class or design pressure, applicable standard, service temperature, fluid, quantity, and delivery location. If your project documents specify only one of these details, include the relevant drawing or written requirement so the request can be checked against the intended application. Final sizing and pressure-class approval should remain with the project’s responsible engineer.
SDR11 is generally the higher-pressure option because it has a thicker wall than SDR17 at the same outside diameter; SDR17 can be appropriate when its lower pressure class satisfies the complete project design. For the common PE100 water reference at 20°C, the comparison is typically PN16 for SDR11 versus PN10 for SDR17, subject to the governing standard and design assumptions. Confirm pressure, surge, temperature, material grade, dimensions, and compatibility before final selection. Send these details to JM Group to request a project-specific quotation and documentation review.
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