EN 13 618 specifies methods for testing the long-term hydrostatic strength of thermoplastic pipes under constant internal pressure. It covers sample preparation, temperature control, testing to failure, and provides critical data for product classification, certification, and quality assurance of PVC-U, PE, PP, and PVC-C pipes.
Overview of EN 13 618
EN 13 618 is a European standard focused on the determination of the long-term hydrostatic strength of thermoplastics pipes. This standard is primarily applied to unplasticized poly(vinyl chloride) (PVC-U), polyethylene (PE), polypropylene (PP), and chlorinated poly(vinyl chloride) (PVC-C) pipes used for the conveyance of fluids. The main purpose of EN 13 618 is to provide a consistent method for testing the rate at which a pipe sample will fail under constant hydrostatic pressure at controlled temperatures over extended periods, typically up to 10,000 hours. Testing to this standard provides essential data on the expected service life and pressure classification of plastic pipes used in infrastructure, irrigation, and industrial applications.
Testing methodology and conditions
The EN 13 618 standard specifies detailed sample preparation, including the size and conditioning of test specimens, precise temperature control (commonly 20°C or 80°C depending on the material), and the exact method of applying a constant internal hydrostatic pressure. Pipe samples are subjected to this pressure over a long period, and the time to failure is recorded. The results support classification of the pipe material and product by their minimum required strength (MRS) ratings.
Role in product classification and certification
Manufacturers and third-party laboratories use EN 13 618 to demonstrate compliance with product specifications, providing data to support CE marking and market access. Results from these tests are critical for quality control, type testing, and certification throughout the supply chain in the plastic pipe industry.
Takeaway
EN 13 618 offers a scientifically standardized way to assess the long-term pressure capabilities of thermoplastic pipes. It is used extensively within the pipe manufacturing sector to ensure consistent, verifiable quality and performance standards are maintained.
Preparation and conditioning of pipe samples
To begin testing according to EN 13 618, obtain representative pipe samples of the correct dimensions as described in the product standard. Inspect each sample for damage and machine or cut the ends to ensure perpendicularity. Condition the samples in a controlled environment to achieve uniform temperature and moisture content prior to testing, as minor differences in these factors can affect test results.
Setting up the hydrostatic pressure test
Carefully install the conditioned pipe samples in a hydrostatic pressure tester equipped with a temperature-controlled bath. Fill the pipes and the test bath with water or another suitable liquid. Ensure end closures and seals are properly secured to prevent leakage during the test. Adjust the bath temperature to the required value according to the material being tested (such as 20°C for most PVC-U and 80°C for certain PE and PP grades).
Conducting the long-term pressure test
Gradually increase the internal pressure to the specified value for the material and wall thickness, as defined in EN 13 618. Maintain the pressure constantly, monitoring for leaks, temperature fluctuations, and any irregularities. The test duration is typically up to 10,000 hours. Record the exact time to failure for each sample, indicated by pipe rupture or leakage.
Analysis and documentation of results
Once testing is completed, analyze the failure times to determine the long-term hydrostatic strength of the pipe specimens. Use the results to assign MRS classification where applicable and generate a report according to the standard’s requirements. Retain detailed records for certification or regulatory review.
Summary
Testing in accordance with EN 13 618 provides reliable data on the long-term performance of plastic pipes under pressure. By following these step-by-step procedures, manufacturers and laboratories can ensure their products consistently meet industry standards and regulatory requirements.
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