To choose Plastic UPVC pipe should consider not only nominal pressure of the pipe itself but also the actual use of the pipe working pressure. The actual use of the UPVC pipe in the operation of the water hammer pressure will be generated. Therefore, to ensure the safe operation of the pipeline, it is necessary to understand the concept of the above pressure, as we select the pipe and design the pipe pressure basis, we will introduce a few UPVC plastic pipe pressure concept:
01 Nominal pressure: the maximum working pressure of the pipe when conveying medium at 20℃, which is also the pressure normally printed on the surface of the pipe.
02 Working pressure: the maximum continuous water pressure acting on the inner wall of the pipe under normal working condition, excluding water hammer pressure.
03 water hammer pressure: piping system work, due to sudden changes in the flow rate of water, and the instantaneous fluctuation of pressure.
04 design pressure: During the piping system working, the maximum instantaneous pressure acting on the inner wall of the pipe, is the pipeline continuous working pressure and the sum of water hammer pressure.
How to choose UPVC pipe pressure level?
Then we are in the selection of pipe, reference to the above factors at the same time should also be combined with the actual application, you can refer to the following formula to select the pipe pressure level, as described below:
Selection of pipe pressure level = pipeline working pressure + about 0.3MPa water hammer pressure + 0.1∽0.2MPa safety margin.
Example: a pipeline working pressure of 0.4MPa, should choose what pressure level of pipe?
Calculation method is as follows:
a. Use pressure = 0.4MPa
b. Water hammer pressure = 0.3MPa
c. Safety factor = 0.1-0.2MPa
d. Pressure rating = 0.4 + 0.3 + 0.1 = 0.8MPa
Conclusion: Pipe with a nominal pressure of 0.8MPa or more should be selected.
Everyone in the choice of pipe first of all to understand the concept of the above pressure in detail, and then based on the actual application environment, take into full account the safety factors in the operation of the pipeline, such as the impact of the fluid temperature and safety margins, etc. to the correct selection of plastic pipe corresponding to the pressure level, in order to ensure the safe operation of the pipe.