Information on the most widely used ASTM standards within the materials testing industry
ISO 1167: 2006 Thermoplastics pipes, fittings and assemblies for the conveyance of fluids -- Determination of the resistance to internal pressure.
ISO 1167 test method specifies a general test method for determining the resistance to internal hydrostatic pressure at a given temperature of thermoplastics pipes, fittings and piping systems for the transport of fluids. The method accommodates water-in-water, water-in-air and water-in-liquid tests.
Hydrostatic pressure testing is a valuable method for assessing the strength and integrity of pressurized systems, ensuring that they can meet operational demands without failure. Hydrostatic pressure testing can evaluate these items by filling pipelines, tanks, or containers with water before pressure is applied to detect any potential leaks or issues.
Hydrostatic pressure tester is critical across multiple industries, from pipeline engineering to industrial piping. It helps prevent costly failures or leaks by verifying whether the system can safely reach the specified pressure levels.

UnitedTest supply the HYD series Pipeline hydrostatic pressure testing machine, according to ISO 1167, ASTM D1598, ASTM D1599. Mainly used to test the plastic pipeline, compound pipeline, such as PP-R, PP-B, PP-A, PVC, PE, HDPE, PE-X etc. Under a stipulated constant hydrostatic pressure force, keeping provision time; or inside the pipe, apply a constant and rapid hydraulic pressure to make the specimen broken in a short period time, check the max. pressure force, then calculate the ring stress. This tester is necessary equipment for plastic pipe manufacturer.
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Why do plastic pipes need to execute the hydrostatic pressure testing?
If plastic pipes are not made properly, hydrostatic pressure can cause them to burst. To determine the resistance of thermoplastic pipes, a hydrostatic pressure testing system subjects the pipes to constant internal water pressure at a constant temperature.
By applying constant pressure inside the pipe and maintaining it for a specified duration (such as 24 hours or longer), the test simulates the stress state under actual working conditions, observing whether any cracking, leakage, or deformation occurs, thus evaluating the material's pressure resistance strength and sealing ability.
ISO 1167 is an international standard that specifies the method for determining the resistance of thermoplastic pipes, fittings, and components to internal hydrostatic pressure. This testing standard applies to pipes made of thermoplastic materials, such as polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC), which are widely used in water and gas distribution systems.
Assessing long-term pressure resistance performance:
Static hydraulic testing simulates the working conditions of pipelines under long-term pressure to detect the creep resistance, sealing performance, and pressure strength of the pipes. For example, buried polyethylene gas pipelines need to maintain a pressure for over 100 hours at either 20°C or 80°C to verify if leakage, rupture, or deformation occurs.
Ensuring safe use:
Plastic pipes may fail during transportation, installation, or use due to temperature fluctuations, pressure variations, or material defects. For instance, a rise in temperature by 2°C could cause PE80 pipes to rupture 200 hours earlier in testing; cuts or scratches may lead to stress concentration, resulting in discrete test data. Static hydraulic testing can identify these issues in advance and optimize the process.
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