HDPE pipe and fitting,PVC pipe and fitting

The low temperature resistance of HDPE pipe (high-density polyethylene pipe) is excellent, which is one of the key advantages of its wide application in cold areas. The following is a specific analysis:

 

Low temperature resistance performance

Minimum tolerance temperature:

HDPE pipe can still maintain flexibility and impact resistance in extremely cold environments of -40? to -60?, and will not become brittle and crack.

(Comparison: PVC pipes become brittle below 0?, and steel pipes lose toughness below -20?)

Low temperature impact resistance:

At -40?, the impact strength of HDPE can still reach more than 60% of that at room temperature, which is much higher than other plastic pipes (such as PPR, PVC).

Anti-frost expansion ability:

Due to the flexibility of HDPE, the pipe can withstand the volume expansion (about 9%) when the internal water freezes, reducing the risk of freezing and cracking.

Core advantages (compared with other pipes)

Performance Indicator	HDPE Pipe	PVC Pipe	Steel Pipe
Minimum Service Temperature	-40? to -60?	0? to 5?	-20? to -30?
Low-Temperature Brittleness	None	Highly Prone to Cracking	Reduced Toughness
Frost Heave Resistance	Can Buffer Through Deformation	Direct Fracture	Potential Weld Cracking

 

Low temperature resistance principle

Molecular structure characteristics:

The linear molecular chain structure of HDPE can still maintain flexibility at low temperatures and is not prone to glass transition (Tg as low as -120?).

Additive enhancement:

High-quality HDPE pipes will add low temperature modifiers (such as elastomers) to further improve impact resistance in cold environments.

 

Application cases in cold regions

Projects within the Arctic Circle: Alaska oil pipelines use HDPE pipes to withstand extreme climates of -50?.

Rural water supply in northern China: HDPE pipes are promoted in Heilongjiang, Inner Mongolia and other places to solve the problem of traditional pipes freezing and cracking in winter.

Alpine ski field irrigation: HDPE pipes are used as snowmaking system pipes in the Swiss Alps.

 

Precautions for use

Material selection recommendations:

Choose HDPE pipes made of PE100 grade raw materials (more resistant to low temperatures than PE80)

Confirm that the product has passed the ISO 9080 low temperature weathering test

Installation points:

The burial depth should be lower than the local permafrost layer (for example, ≥1.5 meters is recommended in northern China)

Use electric fusion connection (more suitable for low temperature construction than hot fusion)

Maintenance management:

It is recommended to drain the pipe when it is not used in winter

Exposure pipes can be coated with insulation materials (such as PEF foam)

 

HDPE pipe is one of the pipes with the best low temperature resistance at present, and is particularly suitable for water supply and gas transportation in high-cold areas. It has become the preferred solution for infrastructure construction in cold areas with its advantages of anti-frost heave, corrosion resistance and long life.

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