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ISO 13254 Plastic pipe and joints watertightness test by internal hydrostatic pressure

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ISO 13254 specifies a hydrostatic pressure test method for evaluating the watertightness of two categories of non-pressure thermoplastics components: (1) multi-piece fabricated products (e.g., custom-molded fittings) and (2) joints in thermoplastics piping systems. It is widely adopted globally, with national equivalents like GB/T 39379-2020 (China), EN ISO 13254:2017 (Europe), BS EN ISO 13254:2017 (UK), and DIN EN ISO 13254:2018 (Germany). The test validates sealing performance under simulated service conditions for drainage, sewerage, and stormwater systems.

The standard aims to ensure consistent assessment of leak resistance, critical for applications like drainage, irrigation, and underground conduits where fluid ingress could compromise system integrity.


Test Principle

The core principle involves subjecting a test assembly (either a fabricated thermoplastics product or an assembly of pipes/fittings with joints) to a controlled internal hydrostatic pressure for a defined duration. Watertightness is verified by visual inspection for leaks, ruptures, or fluid escape during and after testing. The test parameters (e.g., sampling procedure, number of test pieces) are set by the referring product standard. For joint assemblies with angular deflection capability, the test also applies the maximum manufacturer-specified angular deflection to simulate real-world installation misalignment or ground movement.


Test Methods of ISO 13254

The standard defines a hydrostatic pressure test as the core method, with two procedural variants based on the test piece type:

Component TypeTest ProcedureKey Requirements
Multi-piece fabricated productsAccelerated hydrostatic pressure testApply 0.5 bar (0.05Mpa) pressure immediately; maintain for at least 1 minute
Non-fabricated pipe/fitting assembliesGradual pressure rise testRaise pressure to 0.5 bar smoothly over ≤15 minutes; maintain for at least 15 minutes
Additional test conditionsTemperature: Conducted at (23±5)°C using cold tap water (no condensation on the test piece).
Angular Deflection: For joints permitting deflection, apply the maximum angular deflection specified by the manufacturer.


Test Equipment requirement of ISO 13254

Same like ISO 13259, recommend UnitedTest Piping System Joints Leak Tightness Tester , Include: 

End-Sealing Devices:Sized and sealed appropriately for the joint type; restrained to avoid exerting longitudinal forces on the assembly and to prevent separation under pressure. Their mass must not influence angular deflection.

Hydrostatic Pressure Source: Connected to at least one end-sealing device; capable of gradual, even pressure application and maintaining pressure within +2%/-1% of the target (0.5 bar) for the test duration.

Bleed Valve: Vents air from the test piece during water filling.

Pressure-Measuring Device: Verifies compliance with the required test pressure (0.5 bar). 


Test Specimen

Comprise either a fabricated fitting or an assembly of pipe section(s) (with/without sockets) and/or fitting(s), including at least one joint of the type under test.

ISO 13254 Plastic pipe and joints watertightness test by internal hydrostatic pressure

Be assembled per the manufacturer’s instructions, using the smallest available spigot end and largest available socket/socket groove diameter (within tolerances, sampled per the referring standard). Relevant diameters must be measured and recorded.

Optionally be inclined by up to 12° to assist air removal.


Test Application (Industry Field)

ISO 13254 is critical for the thermoplastics piping industry and related infrastructure sectors:

Municipal Infrastructure: Drainage, sewerage, and stormwater systems (PVC-U, PVC-M, PE, PP pipes/fittings).

Building Services: Underground drainage for residential, commercial, and industrial buildings.

Industrial Facilities: Non-pressure fluid transport (e.g., process water, chemical waste) in manufacturing plants.

Civil Engineering: Road construction, land development, and urban renewal projects requiring buried non-pressure piping.


Step by Step Test Procedure of ISO 13254 Plastic pipe and joints watertightness test

MountingSecure the test piece in the apparatus. If the joint permits angular deflection, align it to apply the manufacturer-specified maximum angular deflection.
Water Filling & Pressurization

Introduce cold tap water while bleeding air via the bleed valve.

Fabricated products: Accelerated procedure (0.5 bar, ≥1 min).

Non-fabricated assemblies: Smoothly raise pressure to 0.5 bar over ≤15 min, hold ≥15 min.

Leak MonitoringContinuously observe the test piece and record any evidence of leakage (e.g., drips, wet spots).
Depressurization & DisassemblyReduce pressure, drain water, and dismantle the test piece.
Post-Test InspectionCheck and record any changes in component appearance (e.g., cracks, deformation).
Test Report

Must include references to ISO 13254 and the referring standard; component identification (diameters in mm); test temperature, pressure (bar), and duration (minutes);

applied deflection angle (if any); leakage/rupture details; appearance changes; factors affecting results; and test date.


Related standard:

EN 1053Plastics piping systems. Thermoplastics piping systems for non-pressure applications. Test methods for watertightnes
BS 2782-11:METHOD 1112B

PLASTICS PIPING SYSTEMS - THERMOPLASTICS PIPING SYSTEMS FOR NON-PRESSURE APPLICATIONS - TEST METHOD FOR WATERTIGHTNESS

GB/T 39379Chinese national standard (identical adoption of ISO 13254)

 

Related products and device

ISO 13254 Piping System Joints Leak Tightness Tester (watertightness)

Piping System Joints Leak Tightness Tester it is used to determine the maximum negative pressure value of thermoplastic pipe and composite pipe, and is a necessary testing equipment for plastic pipe manufacturers and testing institutions.

ISO 13254 Piping System Joints Watertightness Leak Test End cap

Stainless Steel End Caps For Pipe Hydrostatic Pressure and Burst Testing are designed for internal hydrostatic pressure testing of pipes and fittings. It is used to seal the sample in order to generate internal pressure in the sample, with the characters: ISO 1167 Type A structure.

Related Standard

ISO 13259 Test for pipe system leak tightness of elastomeric sealing ring type joints

ISO 13259 Leak tightness test Thermoplastics piping for underground non-pressure stipulated determining method of the leak tightness of elastomeric sealing ring type joints buried thermoplastics piping. This standard specifies three basic test pressures for determining the leaktightness of elastomeric sealing ring type joints for buried thermoplastics non-pressure piping systems.


ISO 13259 Leakage tightness test machine. 

Unless otherwise specified in the referring standard, the methods pressures used are the following:

-   p1:  internal negative air pressure (partial vacuum);

-   p2:  a low internal hydrostatic pressure;

-   p3:  a higher internal hydrostatic pressure.

ISO 13844 Test method for leak tightness under negative pressure, angular deflection and deformation

ISO 13844 specifies a method for testing the leak tightness under negative pressure, angular deflection, and deformation of assembled joints between elastomeric-sealing-ring-type sockets made of plastic or metal and plastic pressure pipes.

EN 1277 Leak testing for thermoplastic pipe joints

EN 1277 specifies test methods for assessing the leaktightness of elastomeric sealing ring type joints used in buried, non‑pressure thermoplastics piping systems, such as those for drainage and sewerage. The standard defines three test pressures (partial vacuum, low hydrostatic pressure, and higher hydrostatic pressure) and four test conditions (with or without diametric and/or angular deflection). 

FAQs about ISO 13254 Piping System Joints Watertightness Test

Q1: What is the core purpose of the ISO 13254 test?

A: ISO 13254 specifies a standardized hydrostatic pressure test method to verify the watertightness of two key non-pressure thermoplastics components: (1) multi-piece fabricated products (e.g., custom molded fittings) and (2) joints in thermoplastics piping systems (e.g., pipe-fitting assemblies). It ensures these parts prevent water ingress/egress under typical service loads.


Q2: Why is the ISO 13254 test critically important for thermoplastics piping materials?

A: Joints are the "weakest link": Piping systems fail most frequently at joints; the test validates their core sealing performance.

Environmental protection: Prevents groundwater contamination from sewage/stormwater leakage and soil erosion from pipe failure.

Cost avoidance: Eliminates costly field repairs, replacements, and downtime caused by watertightness defects.

Regulatory compliance: Mandatory for product certification and market entry in the EU, China, and most global markets.

Material reliability: Verifies that PVC, PE, PP, and other thermoplastics (and their joining methods) meet minimum performance standards for long-term service.


Q3: Are there any temperature or water requirements for testing?

A: Yes. Testing is conducted at (23±5)°C using cold tap water, with no condensation permitted on the specimen surface


Q4: How is leakage assessed, and what happens if a leak occurs?

A: Leakage is assessed by continuous visual monitoring during pressurization and the holding phase. Any evidence of leakage (e.g., fluid escape, wet spots) is recorded. After testing, the specimen is inspected for signs of rupture or permanent damage. The test report must state whether the joint leaked, along with details like the position of the leak and the pressure at which it occurred.


Q5: How is angular deflection handled during testing?

A: If the joint permits angular deflection, the test assembly is arranged to apply the maximum angular deflection specified by the manufacturer (relative to the axes of the joined components). The mass of the end-sealing devices must not influence this deflection.

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