hakkında şirket haberleri How to determine the appropriate length of steel casing pipe?

The length of a steel casing pipe depends on its diameter, installation environment, and application requirements. While standard lengths are commonly used, specific projects may require customization. Choosing the right length is essential to ensure both installation efficiency and long-term performance.

Key Factors Affecting Steel Casing Pipe Length

Pipe Diameter

Small diameter (DN15–DN50): Typically supplied in 6 m sections.

Medium diameter (DN100–DN300): Commonly 9 m or 12 m sections.

Large diameter (DN400+): Usually customized, often welded in multiple sections.

Installation Environment

Underground pipelines: Require longer casing with anti-corrosion treatment due to soil moisture and groundwater.

Above-ground installations: Longer sections may be used to resist UV, wind load, and climate impacts.

Water wells & pile foundations: Frequently welded in sections, with single lengths reaching 12–18 m.

Usage Requirements

Load-bearing/pressure pipelines (oil, gas, high-pressure fluids): Longer casing ensures additional protection.

Protective or decorative applications: Shorter 6 m sections (pup joints) are often sufficient, lowering transport and installation costs.

Standard Length Option

6 m: Common for indoor pipelines and short-distance protection; cost-efficient to transport.

9 m / 12 m: Widely used for long-distance projects, reducing the number of welding joints (per SY/T 5768-2016).

Customized (15–18 m segments): For deep wells, pile foundations, or large-span structures.
(Length tolerance is typically ±500 mm; maximum single section ≤18 m.)

Typical Lengths by Specification

DN15–DN20: 6 m, mainly for water and cable protection.

DN25–DN100: 9 m, suitable for medium-sized piping systems.

DN150–DN400: 12 m, often used in municipal and energy pipelines.

DN500+: Custom-made, welded in sections not exceeding 18 m.

How to Select the Right Length

Assess project requirements — clarify pipe diameter, installation conditions, and application.

Refer to standard lengths — adopt readily available options when they meet project needs.

Consider customization — for special projects, consult manufacturers to design and supply tailored casing lengths.

Conclusion

Selecting the correct steel casing pipe length requires balancing technical, environmental, and economic considerations. By referencing standard lengths and customizing when necessary, users can achieve optimal pipeline protection, cost efficiency, and long-term reliability.