The influence of external temperature changes on PVC pipes

Update:22 Jan 2021

The most common water supply and drainage pipe for industrial PVC pipes is made of polyvinyl chloride materials. It is widely used in the pipeline industry. It has the advantages of high strength, good electrical insulation, and light weight. It is also affected by external temperature. , Next, let’s take a look at the effect of changes in external temperature on the performance of PVC pipes?
  1. the upper limit of the baseline temperature
   Colder temperatures usually do not affect the strength of PVC pipes, but as PVC pipes become warmer, they become more flexible and cannot hold pressurized fluids. Depending on the exact specifications of the PVC pipe, the precise upper temperature limit may vary slightly. But generally speaking, the upper limit of PVC pipe is 60 degrees Celsius; beyond this temperature, the PVC pipe loses its structure.
  2. The influence of temperature on the size of PVC
   Temperature changes can cause slight changes in the size of PVC pipes, the most obvious being the pipe length. Generally speaking, for every 12 degrees Celsius rise, the length of the pipe changes about 3.8 inches per 30 meters.
  3. the influence of temperature on pressure capacity
As the temperature increases, the pressure capacity of PVC decreases from a baseline of 73 degrees. Lowering the temperature will not adversely affect the baseline pressure of the pipeline; for temperatures below 73 degrees Fahrenheit, the baseline pressure capacity of the relevant standard should be referred to.

PVC pipe has the following advantages:

   1. High strength
   The compressive strength at 23°C is not less than 45Mpa, the water pressure resistance, external pressure resistance, impact resistance, etc. are all very good, suitable for piping projects under various conditions;
  2. good electrical insulation
   Compared with ordinary wire and tube, PVC threading pipe has better cold bending performance and superior electrical insulation. It is suitable for the piping of wires and cables, and the wire piping in construction;
  3. small fluid resistance
  The inner wall of the PVC pipe is smooth, the roughness coefficient is only 0.009, the resistance to the fluid is small, the water delivery capacity is 20% higher than that of the cast iron pipe, and the concrete pipe is 40% higher;
  4. light weight, convenient shipping
  The specific gravity of PVC pipes is only 1/5 of steel and cast iron pipes, and 1/3 of concrete. It is convenient to load and unload, which can reduce transportation costs by 1/2-1/3;
  5. Excellent chemical resistance
   has excellent acid resistance, alkali resistance, corrosion resistance, very suitable for the use of the chemical industry; non-flammability, high strength, weather resistance and excellent geometric stability.
  6. Simple construction
   PVC pipe material joining construction is quick and easy, so the construction cost is low.