How To Calculate The Pressure Level Required For PEX Press Fittings?

Introduction to PEX Press Fittings

PEX press fittings, represent a modern and efficient method for joining pipes and fittings. These fittings utilize a specialized press tool to secure the connection, offering numerous advantages over traditional piping connection methods.

When calculating the pressure level required for PEX clamp fittings, reference should be made to the relevant standards, specifications and the specific requirements of the piping system. The following is a summary of the calculation steps and considerations based on the information in the reference article:

Determine the standard pressure rating of the PEX tube

According to the national standard GB/T13663-2000, the pressure level of PEX pipe (or PE pipe) usually includes 0.4MPa, 0.6MPa, 0.8MPa, 1.0MPa, 1.25MPa, 1.6MPa, etc. These pressure levels represent the maximum allowable pressure of the pipe under normal operating conditions.

Consideration of SDR value

The SDR value (standard dimension ratio) is the ratio of the outside diameter of the pipe to the wall thickness and is often used to represent the pressure rating in kilograms. For example, SDR11 might correspond to a pressure rating of 1.0MPa.

Determine pipe specifications and wall thickness

Different PEX clamp fittings and pipes have different specifications and wall thicknesses. These parameters will directly affect the pressure that the pipe can withstand.

Use the pressure calculation formula (if more precise calculation is required)

If there are more detailed requirements, such as calculating the maximum allowable pressure of the pipe under certain conditions, the formula can be used: P=(2 x T x E x 1000)/(D-d). Among them:
P is the allowable internal and external pressure of the pipeline (unit: MPa).
T is the long-term predicted metal material strength of the pipeline (unit: MPa).
E is the elastic modulus of the pipeline material (unit: MPa).
D is the average outer diameter of the pipe (mm).
d is the average inner diameter of the pipe (mm).

Consider other factors

In practical applications, some additional factors need to be considered, such as operating temperature, medium properties, pipeline connection, system layout, etc. These factors may affect the actual bearing capacity of the pipeline.

Compliance with standard specifications

When calculating the pressure level of PEX clamping pipe fittings, relevant national standards and industry norms should be followed to ensure the accuracy and reliability of the calculation results.

Consulting professionals

If there is any doubt or confusion about the calculation of pressure levels for PEX clamp fittings, it is recommended to consult a professional in the relevant field or the manufacturer's technical support team.

Sum up

When calculating the pressure level required for PEX clamping pipe fittings, the standard pressure level and SDR value of the pipe should be determined first, and then the appropriate pipe fittings should be selected according to the pipe specifications and wall thickness. If necessary, more complex pressure calculation formulas can be used for precise calculations. During the whole process, various factors should be fully considered and relevant standards and specifications should be followed.