How to Determine the Appropriate Length of Steel Casing Pipe?

The length of steel casing pipe is determined based on the pipe diameter, installation environment, and usage requirements. It generally follows a standard length range, but customization is required in special circumstances.

Steel casing pipe is a widely used pipe protection material in construction, water conservancy, chemical engineering, and other fields. Its length has a significant impact on project installation and operational performance. So, what is the appropriate length for steel casing pipe? This article will analyze this from multiple perspectives to better understand how to determine steel casing pipe length.

Main Factors Affecting Steel Casing Pipe Length

1. Pipe Diameter

Generally, the larger the pipe diameter, the longer the steel casing pipe length required to ensure stability and overall strength.

For example, small-diameter pipes (DN15-DN50) are often cut in 6-meter lengths; medium-diameter pipes (DN100-DN300) are often cut in 9-meter or 12-meter lengths; and large-diameter pipes (DN400 and above) are often custom-made and welded in sections.

2. Installation Environment

Underground pipelines: Consider soil moisture, corrosiveness, and groundwater levels. Extended casing pipe and anti-corrosion treatment are generally required.

Above-ground/open-air installations: Due to the effects of climate, UV rays, and wind loads, the casing pipe length may be appropriately increased to enhance overall rigidity.

Water well/pile foundation projects: Steel casing pipe is often used as casing pipe and often requires welding in sections. Single sections can reach lengths of 12–18 meters.

3. Usage Requirements

Pressure-bearing/load-bearing casing pipe: Suitable for oil and gas transmission and high-pressure fluid pipelines. The casing pipe should be extended to enhance protection.

Protective/decorative casing pipe: When used solely for wear protection or decorative purposes, 6-meter pup joints can be used to reduce transportation and construction costs.

Steel Casing Pipe Length Standards

Steel casing pipe is often shipped in fixed lengths. Common options include:

1. 6 m

Suitable for short-distance pipeline protection or indoor construction, with low transportation costs.

2. 9 m/12 m

Used for long-distance pipeline projects to reduce welding nodes (according to SY/T 5768-2016 standard).

3. Customized Segmented

When projects require deep wells or large-span casing pipe, 15-18m segmented welding can be used.

Note: The actual length tolerance is ±500mm. Casing pipe for deep well pile foundations may require segmented welding (single segment ≤ 18m).

Length Variations of Different Steel Casing Pipe Specifications

Steel casing pipe comes in a variety of specifications, with common sizes including DN15, DN20, and DN25. Lengths also vary within different specifications.

1. DN15-DN20

Common lengths are 6 meters, primarily used for indoor water pipes and cable protection pipes.

2. DN25-DN100

Mostly 9 meters, suitable for medium-sized piping systems.

3. DN150–DN400

12-meter lengths are commonly used, widely used in municipal and energy pipelines.

4. DN500 and above

Mostly custom-made, shipped and installed in sections, with each section not exceeding 18 meters.

Of course, this is only a common length standard; actual lengths may vary depending on the manufacturer.

How to Choose The Appropriate Length for Steel Casing Pipe

When selecting steel casing pipe length, users should consider the above factors and make a decision based on actual circumstances. Here are some suggestions:

1. Understand Project Requirements

Before selecting steel casing pipe, first clarify the specific project requirements, including pipe diameter, installation environment, and usage requirements.

2. Reference Standard Lengths

After understanding the project requirements, you can refer to the standard length range available on the market. If a standard length meets your needs, consider using standard-length steel casing pipe.

3. Consider Custom Options

If standard steel casing pipe lengths do not meet your needs, or if a custom length is required, you can communicate with the manufacturer and provide detailed project parameters and application requirements so that the appropriate length can be customized.

Summary

In summary, selecting the appropriate steel casing pipe length requires comprehensive consideration of multiple factors, including pipe diameter, installation environment, and application requirements. By understanding these factors and considering standard lengths or custom options, users can ensure that the selected steel casing pipe meets project requirements and provides excellent protection.