Water Well Casing Pipe Parameters & Size Chart

Water well casing pipe is a crucial component of water well construction, primarily supporting the well wall, isolating the aquifer, and preventing collapse and contamination. Its specifications and dimensions not only affect the well's water yield but also its structural safety and service life.

Common Water Well Casing Pipe Parameters

1. Model

Water well casing pipe models are typically named based on their outer diameter and wall thickness.

For example, "DN200×6" indicates a well casing pipe with an outer diameter of 200mm and a wall thickness of 6mm.

2. Outer Diameter

Water well casing pipe comes in a wide range of outer diameters, with common sizes including DN100, DN150, DN200, DN250, and DN300.

The outer diameter should be determined based on the well's borehole diameter, geological conditions, and required water volume.

3. Wall Thickness

The wall thickness of water well casing pipe is also a crucial parameter, directly affecting its pressure-bearing capacity and service life. Common wall thicknesses include 4mm, 6mm, 8mm, and 10mm.

The choice of wall thickness should be based on a comprehensive consideration of factors such as geological conditions, water pressure, and casing pipe material.

Common Water Well Casing Pipe Size Chart

Note: The above chart is for example purposes only; actual product specifications may vary depending on the manufacturer and market demand.

How to Choose Water Well Casing Pipe?

When selecting water well casing pipe, in addition to size, the following factors should also be considered:

1. Geological conditions

Geological conditions vary significantly between regions, such as rock layers and sandy soil layers.

For gravel or loose soil layers: Choose thick-walled, high-strength casing pipe to prevent hole collapse.

Rock formations: Casing pipe with relatively thin walls can be used, but the borehole diameter and well depth must be considered.

2. Water pressure

Water pressure is also an important factor to consider when selecting water well casing pipe.

Shallow wells (<100 meters): Pressure is generally low, so DN100–DN150 with a wall thickness of 4–6mm is often selected.

Deep wells (>200 meters) or confined water formations: Pressure is higher, so DN200 or above with a wall thickness of ≥8mm is recommended.

3. Material selection and service life

The service life of water well casing pipe is closely related to its material and operating environment.

Carbon steel casing pipe: With a service life of approximately 20–30 years, it is cost-effective and has high pressure-bearing capacity. It is commonly used in engineering and industrial wells.

Stainless steel casing pipe: With a service life of approximately 30–50 years, it offers excellent corrosion resistance and is suitable for wells with high salinity or where a long service life is required.

PVC/UPVC casing pipe: With a service life of approximately 15–25 years, it's lightweight and corrosion-resistant, making it suitable for shallow wells or rural private wells, but its strength is lower.

FAQ

Q1: What are the common standards for water well casing pipe?

A1: Common standards include API 5CT (casing pipe standard for the oil and gas industry), GB/T 14976 (stainless steel pipe standard), and ISO standards.

Q2: What are the differences between deep and shallow well casing pipe?

A2: Deep wells must withstand higher water pressure and formation stress, so thick-walled steel casing pipe is generally used. Shallow wells can use lightweight PVC or thin-walled steel pipe.

Q3: What is the price of water well casing pipe?

A4: The price of water well casing pipe is significantly affected by the material, specifications, wall thickness, and market conditions. For example, carbon steel water well casing pipe costs approximately US$700–1,200 per ton.

Summary

The selection and installation of water well casing pipe are key aspects of water well construction, with outer diameter, wall thickness, and material being the three key parameters. The right choice can not only increase the water output of the well, but also significantly extend its service life and reduce maintenance costs.