What Is Hydrostatic Pressure Testing?

Hydrostatic Pressure Testing or hydrotest of pipes is a specialized testing method used to assess the pressure resistance performance of pipes under constant pressure and temperature, mainly applied to quality inspection of plastic, composite, and other types of pipes.

Testing Principle: 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.

In What Application scenario you need use the Hydrostatic Pressure Testing Equipment?

The static Hydrostatic Pressure Testing of pipes is mainly used to assess the pressure resistance and sealing performance of pipes under constant pressure, and its application scenarios cover multiple fields:

Gas Pipeline Safety Testing: Used for strength verification of underground polyethylene gas pipeline systems, simulating actual working conditions to test the pressure resistance of the pipeline, ensuring gas transportation safety. 

Plastic Pipe Performance Testing: Applicable to long-term pressure resistance testing of thermoplastic pipes such as PE, PVC, and PP-R, conducted according to the national standard ISO 1167 to evaluate their cracking resistance and sealing performance. 

Automotive Component Testing: Can determine the pressure endurance time and burst pressure values of automotive hoses, rubber hoses, air conditioning pipes, etc., ensuring the safety of automotive hydraulic systems. 

Metal Pipe Verification: Conduct macro strength and sealing tests on metal pipes such as steel and aluminum pipes to ensure the stability of metal pipelines under high-pressure environments. 

Other Material Testing: Applicable to pressure resistance evaluation of non-metallic materials such as rubber hoses and geothermal pipes, by controlling pressure and temperature parameters to simulate actual use scenarios.

What Data and Result you can get from the Hydrostatic Pressure Testing?

Pressure Resistance Performance

By simulating the long-term pressurized environment of pipes, the creep resistance and durability of the pipe material are assessed. According to standard requirements, the pressure values are adjusted based on the designed pressure rating of the pipe (e.g., SDR11, SDR17) and the test temperature (20°C, 80°C); for instance, the test pressure for PE100 pipes at 80°C is generally 4.6MPa. 

Temperature Control

The tests need to be conducted in a constant temperature environment, with temperature fluctuations controlled within ±1°C. If the temperature deviation exceeds this range, it may lead to invalid test results or data errors. For example, a temperature increase of 2°C can accelerate the pipe's creep, resulting in a shorter test duration. 

Failure Modes

Record the rupture time and failure mode of the pipe material (ductile fracture or brittle fracture), and analyze the material properties through features such as the elongation rate and cross-sectional flatness. For example, brittle fractures are often caused by processing defects or material degradation. 

Data Recording

Real-time acquisition of pressure, time, and temperature parameters in synchronized curves is necessary, with a sampling frequency of ≥1Hz. Data should include original waveform recordings and photographs of failure modes. Manual recording can easily lead to transcription errors, so it is recommended to use an automated acquisition system.

Why Choose UnitedTest Hydrostatic Pressure Testing Machine and the feature of UnitedTest testing machine?

HYD series Pipeline hydrostatic pressure testing machine is designed according to ISO 1167, ASTM D1598, ASTM D1599. It’s mainly used to test the plastic pipeline, compound pipeline, such as PP-R, PP-B, PP-A, PVC, PE, 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.
 

Feature of HYD-B series:
Computer controlled tester, and LCD meter control (both way, and independent, one failure not affect the another test way.) 

Pressure 10Mpa (100bar), 20Mpa (200bar)

16mm to 2000mm HDPE,PE,PVC, PPR etc., pipe and pipe fittings.

Key features: 

1, Computer software and LCD gauge two ways control mode.

2, All working stations can execute both the hydrosatic pressure test and burst test. 

 Compact and orderly internal struture     /        Different size pipe end caps                             

Principle:
Test pieces are subjected to a specified constant internal hydrostatic pressure for a specified period of time or until a test piece or pieces fail.
Throughout the test, the test pieces are kept in an environment at a specified constant temperature: this is commonly in water (“water-in-water” test).
The following test parameters shall be specified by the standard or specification making reference to this part of ISO 1167:
a) the type of end cap to be used (see 5.1 and ISO 1167-2:2006, 4.1);
b) the test temperature;
c) the number of test pieces;
d) the duration of the test under pressure and the criteria for a failure;
e) the test pressure, p, or the circumferential (hoop) stress, σ, to be induced by the test pressure.
  

Other name of pipe hydrostatic pressure testing machine:
HYDROSTATIC PRESSURE OR INTERNAL PRESSURE TEST MACHINE FOR PVC(U) AND HDPE, Plastic Pipe Hydrostatic Pressure Testing Equipment, pipe internal pressure testing machine; thermoplastic pipe, pipe fitting hydrostatic pressure testing machine; internal hydrostatic pressure testing; pipe burst pressure testing, pipe long time pressure test.  

Standard: 

ISO 1167: Thermoplastics pipes, fittings and assemblies for the conveyance of fluids -- Determination of the resistance to internal pressure;

ASTM D1598: Standard Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure;

ASTM D1599:  Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings;

ASTM D2837,ISO1167, ASTM D1598, ASTM D1599, ASTMD1784,ASTM D2466,ASTM F442, ASTM D2672,ASTM D2837,ASTM D2992,ASTM D2517,ASTM D2241,ASTM D3139,ASTM D3212,ASTM D2846,ASTM D2846M

Main specificaiton: 

Related products:
1, Constant temperature water tank (max. 95 degree)
2, Cooling machine
3, End closure, end caps for pipe, pipe fittings (10mm to 2000mm)

Main Accessories: 

ISO 1167: Thermoplastics pipes, fittings and assemblies for the conveyance of fluids -- Determination of the resistance to internal pressure;

ASTM D1598: Standard Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure;

ASTM D1599:  Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings;

ASTM D2837, ISO1167, ASTM D1598, ASTM D1599, ASTMD1784,ASTM D2466,ASTM F442, ASTM D2672,ASTM D2837,ASTM D2992,ASTM D2517,ASTM D2241,ASTM D3139,ASTM D3212,ASTM D2846,ASTM D2846M