EN 12 118 sets out test methods to determine internal pressure resistance of thermoplastics pipes and fittings at constant temperature. It defines sample preparation, test conditions, and evaluation criteria to assess product quality, durability, and compliance for materials like PE, PP, and PVC.
Overview of EN 12 118
EN 12 118 is a European standard that specifies the method for determining the resistance to internal pressure at constant temperature of thermoplastics pipes and fittings. This standard is widely used in the plastics pipe industry for type testing and quality control. The method outlined in EN 12 118 is applicable to both plain end pipes and fittings made from thermoplastics, ensuring that products are tested for their ability to withstand sustained pressure over defined durations. Testing in accordance with EN 12 118 helps manufacturers demonstrate compliance with technical requirements for safety and durability, and allows authorities and end users to assess product performance.
Test conditions and sample requirements
EN 12 118 requires that test specimens are conditioned and tested at prescribed temperatures, usually 20°C, 60°C, or 80°C, as specified for specific materials and intended applications. The internal pressure to be applied, and the duration of the test, are determined by the product’s intended use and material properties. Test specimens must typically be unjointed pipes or fittings, unless otherwise allowed by product specifications. The standard outlines the required number of samples for statistical reliability and describes how to measure and record failure modes such as burst or weeping.
Relevance for compliance and product development
EN 12 118 plays a significant role in ensuring conformity within the plastics piping industry in Europe and beyond. Manufacturers rely on this standard for production quality checks, type approval, and certification. The results not only provide measurable evidence of a pipe or fitting’s ability to withstand service conditions but also guide designers and engineers in evaluating product suitability for various pressure applications.
Takeaway
EN 12 118 is a foundational standard for pressure testing thermoplastics pipes and fittings, providing precise methods to validate long-term performance and regulatory compliance.
Preparation and sample conditioning
Before testing, gather the appropriate number of pipe or fitting samples as defined by EN 12 118 and the product specification. Visually inspect all samples to ensure they are free from surface defects and cut them to the correct length. Condition samples at the test temperature for a minimum of 1 hour, or as otherwise specified. This step ensures thermal equilibrium and accurate test results, especially when testing at elevated temperatures like 60°C or 80°C.
Setting up the pressure test
Install the conditioned samples into the pressure testing apparatus, ensuring proper sealing to prevent leakage outside the test area. Fill the system with the appropriate fluid—usually water—and purge all air. Set the apparatus to the required constant temperature and fix the pressure to the specified value for the material and application.
Performing and monitoring the test
Maintain the specified internal pressure and constant temperature throughout the test duration, which may range from 1 hour to over 1,000 hours based on intended application and standard requirements. Regularly monitor the test rig for leaks or temperature fluctuations. Record the time to failure if a sample bursts, leaks, or exhibits weeping, and note the failure mode as laid out in EN 12 118.
Evaluation and reporting
After sample removal, assess each for the type of failure and record results as specified by the standard. Prepare a report detailing the number of failures, time to failure, conditions of the test, and any deviations from the procedure. Use the results to determine if samples meet the pressure requirements for compliance or further investigation.
Ensuring accuracy and repeatability
For reliable results, ensure that all equipment is regularly calibrated, all procedures follow EN 12 118 closely, and environmental controls are maintained throughout. Repeat tests as necessary for statistical confidence and use proper sample labeling for traceability. Adherence to these steps supports consistent and accurate performance measurement of the pipes or fittings under test.
Summary
Testing according to EN 12 118 involves sample preparation, careful test setup, constant monitoring, evaluation, and documented reporting. Following each step precisely is essential for valid, comparable, and compliant results.
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