Can PE pipes transport a 25% calcium chloride solution at -20 degrees Celsius?

Are the low-temperature properties of PE pipes satisfactory? ? ?

HDPE is a thermoplastic resin with high crystallinity and non-polarity. HDPE has excellent electrical properties, particularly a high insulation dielectric strength, which makes it very suitable for use in wires and cables. The medium to high molecular weight grades possess excellent impact resistance, both at room temperature and even at low temperatures of -40°F.

The pressure resistance should be fine; many such pipes are used for transporting tap water and sewage. I’ve also seen fire protection pipes made of HDPE

SH/T 3161-2011, the Technical Specification for Non-metallic Pipes in the Petrochemical Industry, specifies a minimum operating temperature of -20°C; if the temperature you mentioned is the operating temperature, it is better not to choose HDPE.

It’s completely possible, as HDPE has excellent low-temperature performance. In principle, low temperatures increase the crystallinity of the product and reduce the flexibility of the polymers, which is mainly reflected in a decrease in impact resistance. However, the notched impact strength of typical HDPE at -20°C is greater than 10 kJ/m2. This is even higher than the impact resistance of PVC pipes at room temperature. The disadvantages of HDPE in industrial applications lie not in its performance at low temperatures, but rather in its performance at high temperatures and its rigidity. Additionally, HDPE has one of the highest shrinkage rates among plastics, which makes it difficult to control the quality of injection-molded products. As a result, valves made of HDPE are generally not used, and it is also challenging to produce pipes from this material, as defects are likely to occur. Additionally, the pipeline has significant linear expansion, so it is recommended to install compensation devices such as expansion joints. If the pipeline is not very long, β-PPH pipes are more recommended (note: not FRPP pipes). Their impact strength at -20°C is around 5 kJ/m2, which is more than sufficient for loads up to 10 kilograms. Its industrial applications are more mature, with a wide range of compatible fittings and valves available. Chloride ions can erode the metal passivation layer, but plastic pipes do not have this problem; they are completely corrosion-resistant and can be used with confidence. There’s another question: is a calcium chloride solution at -20°C an aqueous solution, and is it prone to the formation of ice crystals? If it is an aqueous solution, will it freeze once the process stops?

Thank you for the answer. I misstated it; the medium being transported is an aqueous solution of calcium chloride with a concentration of 25%, and its freezing point is around minus 31°C.

Thank you for the reply. I will download the guidelines*

It’s not buried; it’s above ground, although it has insulation