EN 744 specifies the method for testing the resistance to external blows of thermoplastics pipes. It defines impact test procedures, equipment, and evaluation criteria to ensure durability during handling and installation. The standard supports quality control and helps manufacturers meet product certification requirements.
Standard overview
EN 744 is a European standard that outlines the method for determining the resistance to external blows of thermoplastics pipes used in the conveyance of fluids. The main objective of this standard is to ensure that thermoplastic pipes, such as those made from PVC, PE, or PP, can withstand impacts during transportation, installation, and operational use without developing cracks or failing. The test method described in EN 744 is often referred to as the “longitudinal repeated impact test,” and is relevant for manufacturers and end-users seeking to validate the durability and mechanical performance of their plastic piping solutions.
Test method and purpose
The EN 744 test is performed using a striker that drops from a specified height onto test pipes supported on a rigid base. The pipes are subjected to a series of controlled impacts at predetermined points along their length. The standard provides the calculation method for the total number of blows required, as well as how to interpret any damage or cracks to determine whether the pipe meets the required pass/fail criteria. The aim is to simulate real-life conditions where pipes might be accidentally struck or dropped.
Importance for industry
Compliance with EN 744 benefits both pipe manufacturers and end-users by confirming that pipes have suitable mechanical properties for safe use in a variety of applications. Testing according to this standard is important for quality assurance, regulatory approval, and to prevent potential failures in field installations. The method ensures continuity in product performance and increases confidence in plastics piping systems across infrastructure and utility sectors.
Takeaway
EN 744 establishes consistent and reproducible guidelines for evaluating the impact resistance of thermoplastics pipes, supporting both product development and market confidence.
Preparation and sample conditioning
Test specimens must be prepared carefully in accordance with EN 744 specifications. Pipes are cut to required lengths, edges are smoothed, and samples are conditioned to ensure temperature uniformity. The standard specifies the need for temperature conditioning (typically at 0°C or 23°C, depending on the application) for a defined duration prior to testing in order to generate reproducible results.
Test equipment setup
The striker apparatus and support base must meet the design requirements of EN 744. The drop height and mass of the striker are selected based on the pipe’s wall thickness and diameter as defined in the standard.
Performing the impact test
Each test pipe receives a predetermined number of blows at specified, evenly distributed impact positions along the sample length. After each blow, the operator inspects the sample for signs of visible cracks or failure that penetrate the pipe wall. The procedure is repeated across all designated points and pipe samples as specified by EN 744.
Result evaluation and reporting
The results are assessed by examining each impact site. The number of failures is recorded, and the pass/fail criteria are defined by the maximum allowable number of failures as per the product specification. Documentation must include pipe dimensions, impact parameters, the number of failures, and environmental conditions during testing.
Best practices and common considerations
To ensure reliable and repeatable outcomes, use calibrated equipment and control environmental conditions as narrowly as possible. Test specimens should be representative of production pipes, and careful attention to handling, marking, and conditioning is crucial. Repeating the test across multiple samples helps provide a statistically valid assessment of the product’s impact resistance.
Summary
Testing thermoplastic pipes to EN 744 requirements provides an objective method for evaluating mechanical resistance to impact. Accurate sample preparation, controlled test conditions, and thorough result documentation ensure compliance and product reliability.
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