How much pressure can the PPR water pipe and fitting withstand

How much pressure can the PPR pipe and fitting bear? What is the maximum pressure of PPR water pipes? Similar problems are the concerns of many customers. Today, I am sharing an article about PPR pipe pressure.

all kinds of ppr fitting
First of all, the design and use requirements of the selected PPR pipes and fittings are mainly the design service life, the design use temperature, and pressure. Why it is necessary to understand the above information first? This is because the three design and use requirements affect each other, that is, how much pressure the PPR tube can withstand must be based on the design service life and the design working temperature. For example, when the design safety factors are S=1.25 and S=1.5, the relationship between the tube series and the maximum allowable working pressure (20°C, 50 years).

ppr parameter

Maximum continuous working pressure of pipeline

Pressure level

Combined with the above table, we have summarized two key points for users:

1. If the design service life of the PPR pipe is set to 50 years, the higher the design working temperature, the lower the continuous working pressure that the PPR pipe can withstand, and vice versa.

2. If the design temperature of the PPR pipe exceeds 70℃, the working time and continuous working pressure of the PPR pipe will be greatly reduced. It is precisely because of the excellent performance of PPR pipes below 70°C that PPR pipes become the most mainstream hot and cold water pipes because the general domestic hot water temperature is below 70°C.

Continue to discuss the issue of how much pressure the PPR pipe can withstand. Let’s take the PPR pipe with a PN value of 2.0 as an example, which is the most commonly used S3.2 series pipe for home improvement PPR pipes (specifications D20*2.8 and D25*3.5 pipes). :

When the water temperature is 10℃, the maximum pressure value of the S3.2 pipe allowed to work continuously for 50 years is 3.03Mpa, which is 30.03kg/cm2, and the maximum pressure of the Baidie PPRS3.2 pipe is 8.0MPa, which is 800kg/cm2. Far higher than the standard requirements.

When the water temperature is 40℃, the maximum pressure value of S3.2 pipes allowed to work continuously for 50 years is 1.83Mpa, which is 18.3kg/cm2.

When the water temperature is 70℃, the maximum pressure value of the S3.2 pipe that allows continuous work for 50 years is 0.85Mpa, which is 8.5kg/cm2.

Finally, add another piece of knowledge: the static water pressure of the water distribution points in each partition of the building’s drinking water purification should not be greater than 0.45MPa, that is, the water pressure of the tap water is much lower than the maximum pressure of the PPR pipe.

After installing the piping system, you must test the pressure. A warm reminder that the maximum pressure of the pipe is different from the maximum pressure of the piping system. There are multiple pipes and fittings in the middle of the piping system. The pressure value cannot be evaluated, so the construction Technical requirements: The test pressure after installation of the piping system shall not be less than 1.5 times the pressure of the water supply, that is, the pressure test of the piping system shall not be less than 0.675MPa.

Our construction technical standards require that the test pressure value of the pipeline system after installation is 1.2 MPa, and the pressure is maintained for 30 minutes. The pressure drop should not exceed 0.06 MPa, which means that the pressure should be 12 pressures and the pressure drop should not exceed 0.6 pressure, which can be called a super high Standard pipeline pressure test process. Our ppr pipes, product quality, and installation quality are guaranteed for 50 years, and we are assured of choosing home improvement pipes!

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