Discussion on the working pressure limit of floor

Discussion on the working pressure limit of floor radiant heating system

in recent years, with the gradual recognition of floor radiant heating, it has been applied more and more in various construction projects. At the same time, all regions have issued relevant design and construction specifications to guide relevant projects

in various standards, there are basically two views on the working pressure of the system: one is that the working pressure of the system should not exceed 0.6MPa, and the other is that the working pressure of the system should not exceed 0.8 MPa shear strength

in the process of practical application, some technicians believe that because the floor radiant heating is a double pipe system, there must be serious vertical imbalance! In order to avoid vertical imbalance, when the building exceeds a certain height (7 floors), the heating system must be separated. In this way, the working pressure in the area where the floor radiant heating coil of each system is located is generally not more than 0.4 MPa

in floor radiant heating projects, due to the advantages of PP-B and PP-R, the proportion of applications in floor radiant heating projects is also increasing. It is of great significance to clarify the working pressure of the heating system for the safe, applicable and economical selection of PP pipes

the working pressure of the system is often related to the height of the heating building (or the building height and terrain in a certain area). Here, a simple analysis is made for the typical floor heating systems of 6-story and 18 story buildings respectively

discuss the pressure of the system

the condition basis of the analysis:

the resistance calculation of the heating coil is calculated with reference to the following calculation table

hydraulic calculation table of plastic pipe or aluminum-plastic composite pipe

note: (1) the hydraulic calculation table is calculated according to the water temperature of 10 ℃. When the water temperature is different, the kinematic viscosity coefficient of water is different, and the force loss of Jinan assay bearing fatigue life test machine should be corrected. The international standard for fluorine chemical industry from the period of calculation in China to the present is the water temperature correction coefficient of resistance formulated under the auspices of polyfluorocarbon. Note: (2) when the wall thickness is different from the wall thickness in the hydraulic calculation table, the inner diameter under the actual wall thickness shall be calculated, and the following ratios shall be calculated