Overview
ISO 13845:2015 is an international standard developed by the International Organization for Standardization (ISO) that defines a test method for leaktightness of elastomeric-sealing-ring-type socket joints used with thermoplastic pressure pipes. This standard specifically addresses the leak tightness under internal pressure combined with angular deflection, ensuring that joint assemblies maintain integrity when subjected to real-world mechanical stresses. It is essential for manufacturers, engineers, and quality control professionals working with plastics piping systems to verify the performance and reliability of socket joints in fluid transport applications.
Key Topics
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Scope and Applicability
ISO 13845:2015 applies to joints assembled between elastomeric-sealing-ring-type sockets-made of plastic or metal-and thermoplastic pressure pipes. It covers test conditions for monitoring leakage under internal pressure while the joint is also subjected to angular deflection.
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Test Principle
The method involves mounting a plastic pipe into a socket joint and applying an internal hydrostatic pressure within a controlled temperature range. Simultaneously, an angular deflection is imposed on the pipe/socket assembly to simulate bending stresses. The joint is then checked for any leakage throughout the specified test duration.
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Test Parameters
The standard requires compliance with parameters such as:
- Test medium (usually water or another fluid)
- Test pressure (up to twice the nominal pipe pressure)
- Test temperature (controlled within ±2 °C)
- Angle of deflection
- Test duration
These parameters may be defined by associated standards referring to ISO 13845 or default values in the standard’s Annex A.
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Test Apparatus
The described equipment includes a fixed framework capable of applying angular deflection, a pressure control and measuring system to maintain and monitor hydrostatic pressure, and a mechanism that ensures precise positioning and force application without deforming the socket.
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Specimen Preparation
Test assemblies use pipes and fittings prepared according to manufacturer instructions, ideally tested after 24 hours from production to stabilize material properties. Pipe and socket dimensions should reflect production tolerance extremes to ensure meaningful test results.
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Procedure
The procedure includes securing the test joint, determining or enforcing the required angle of deflection, filling the assembly with test medium while removing air, conditioning to temperature equilibrium, and maintaining pressure and deflection while continuously checking for leaks.
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Reporting
Test reports must document detailed information including the reference standards, component specifications, angle of deflection, test conditions (pressure, temperature, duration), observed leakage, and any factors influencing test results. This documentation supports product certification and compliance.
Applications
ISO 13845:2015 is widely used in industries involving thermoplastic piping systems where reliable sealing performance under pressure and mechanical stress is critical. Key application areas include:
- Water supply and distribution networks
- Sewage and drainage systems
- Industrial fluid transport pipelines
- Heating and cooling installations
- Chemical processing plants using plastic piping
By adhering to this standard, manufacturers can confidently validate the durability and leak tightness of socket joints in elastomeric seals, reducing failures and maintenance costs in field installations.
Related Standards
ISO 13845:2015 is part of a broader framework of standards governing plastics piping systems and test methods. Relevant related standards include:
- ISO 13844 – Specifications for testing mechanical properties of plastic pipes and fittings
- ISO 14236 – Resistance to internal pressure testing of thermoplastic pipes
- ISO 16135 – Test methods for joint integrity under mechanical stress
- ISO 4435 – Plastics piping system performance requirements
These standards collectively ensure comprehensive quality assurance for plastic piping components, covering everything from material properties to joint testing under a variety of operational scenarios.
Leveraging ISO 13845:2015 provides a recognized methodology for confirming the performance and safety of elastomeric-sealing-ring-type socket joints with thermoplastic pressure pipes, driving higher standards in piping system reliability worldwide.
Open preview (PDF)Plastics piping systems — Elastomeric-sealing-ring-type socket joints for use with thermoplastic pressure pipes — Test method for leaktightness under internal pressure and with angular deflection