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Drilling pipe DN110 PVC drilling pipe DN300 drilling pipe reinforced PVC drilling pipe is a type of well pipe made of polyvinyl chloride (PVC), mainly used in the construction of shallow water wells, monitoring wells, and ground source heat pump systems. With its corrosion resistance, lightweight and easy installation characteristics, it has become an alternative to traditional steel well pipes. The following is its core information and selection guide:
1、 Core advantages
Strong corrosion resistance, acid alkali resistance, salt spray resistance, and chemical erosion of groundwater, with a service life of over 50 years (far exceeding the service life of steel pipes by 5-10 years).
Lightweight construction
The weight is only 1/5 of a steel pipe, and it can be quickly installed manually without the need for heavy machinery.
Low cost maintenance
No anti-corrosion treatment is required, and the overall cost is 30% -50% lower than that of steel pipes.
Environmental protection and safety
Compliant with GB/T 10002.1 drinking water standards, odorless, and free of heavy metal precipitation.
2、 Technical parameters
project
parameter
material
PVC-U (Unplasticized Polyvinyl Chloride)
Specification range
DN50-DN300 (commonly used DN110 DN160）
wall thickness
3.0mm-8.0mm (selected according to pressure requirements)
Ring stiffness
SN4-SN8 (applicable for well depth ≤ 100 meters)
Execution standards
GB/T 10002.1、ASTM D1785
3、 Applicable scenarios
Household drinking water well: Well depth ≤ 80 meters, water quality without strong acid/alkali corrosion.
Agricultural irrigation well: UV resistant, suitable for outdoor installation.
Ground source heat pump well: low thermal conductivity, reducing heat loss.
Groundwater monitoring well: resistant to chemical pollution and compatible with sampling equipment.
4、 Selection suggestions
one
Matching well depth with pipe diameter
Well depth ≤ 50 meters: choose DN110 × 4.0mm, ring stiffness SN4.
Well depth 50-100 meters: choose DN160 × 6.0mm, ring stiffness SN8.
Connection method
Threaded connection: Suitable for DN ≤ 110, PVC adhesive sealing is required.
Socket adhesive: Recommended for DN ≥ 160, with high interface strength and leakage prevention.
Filter pipe configuration
Use PVC filter pipes (with an opening rate of 15% -20%) in the aquifer section, wrapped with stainless steel mesh or nylon mesh for sand control.
5、 Construction precautions
Well preparation
The wellbore diameter should be 100-150mm larger than the outer diameter of the pipe, ensuring that the gravel filling thickness is ≥ 50mm (gravel particle size 2-4mm).
Lower pipe operation
Segmented connection, with each section length ≤ 6 meters, to avoid bending stress concentration.
Gravel filling and well sealing
Fill the periphery of the filter pipe with gravel to the top of the aquifer, and seal the upper part with clay balls to prevent pollution.
6、 Frequently Asked Questions
Q: How much water pressure can PVC well pipes withstand?
A: DN110 × 4.0mm PVC well pipe, with a working pressure of ≥ 0.6MPa (approximately 60 meters of water column pressure), suitable for most shallow water wells.
Q: Will PVC pipes crack at low temperatures?
A: PVC-U can withstand low temperatures up to -10 ℃. If in cold regions such as Northeast China, it is recommended to choose cold resistant modified PVC (such as CPVC) or HDPE pipes.
Q： How to prevent deformation of PVC well pipes?
A： During installation, ensure that the vertical deviation of the wellbore is ≤ 1%, and fill the gravel evenly to avoid uneven lateral pressure.
Summary: PVC drilling pipes have the core advantages of low cost, corrosion resistance, and easy installation, making them suitable for shallow civilian wells and monitoring wells. When selecting, it is necessary to match the well depth, water quality, and geological conditions, and strictly follow the construction specifications to ensure the service life. If the well depth is greater than 100 meters or the formation is complex, it is recommended to use HDPE pipes or steel pipes.
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