Sep 15, 2026Grades & Materials
Large Diameter DN Steel Pipe: DN219, DN808 and DN1400 Selection Guide
Selection guide for large diameter DN steel pipe: what DN219, DN808 and DN1400 are, their stated properties and typical industrial applications.
Quick answer: large diameter DN steel pipe is pipe sized by nominal diameter, and selecting it means matching a specific DN size to the duty, because diameter governs flow capacity, load-bearing capacity and the handling method. DN219 at 219 mm is a moderate diameter for building structures, pipeline engineering and mechanical work. DN808 at 808 mm is high-strength carbon steel pipe for load-bearing structures, oil and gas lines and heavy equipment. DN1400 at 1400 mm is a giant pipe for high flow oil and gas transmission, municipal engineering and bridge support. Each size below has a structured entry covering what it is, its stated properties and its typical applications.
What DN Means in Steel Pipe Sizing
A DN designation is a nominal pipe diameter specification, and the number gives the diameter in millimetres, so DN219 is a pipe of 219 mm diameter and DN1400 a pipe of 1400 mm diameter. The source states that steel pipe diameter has great significance for different application scenarios because it determines load-bearing capacity and the scope of application in a specific project. The three sizes in this guide therefore sit at three different points on that scale: a moderate 219 mm pipe that the source describes as easy to process and connect and cheaper than larger pipe, an 808 mm pipe described as suitable for complex environments and engineering projects, and a 1400 mm pipe described as able to transport large amounts of liquid or gas.
DN219
DN219 is a steel pipe with a nominal diameter of 219 millimetres, and DN is the pipe diameter specification in international standards, so 219 indicates a diameter of 219 mm. The source states that diameter determines load-bearing capacity and the range of application, and that 219 mm is a moderate size, which is why the pipe is described as easy to process and connect. Stated advantages are high strength with greater bearing capacity and pressure resistance than smaller pipe, corrosion resistance that can be improved by choosing a suitable material and surface treatment, easy processing and connecting, and lower cost than larger diameter pipe, which makes it economical for use.
DN808
DN808 is a steel pipe with a diameter of 808 millimetres, typically made of high-strength carbon steel. The source states it has excellent pressure resistance, wear resistance and corrosion resistance, making it suitable for complex environments and engineering projects. Its stated material properties are high strength from high-strength steel to withstand large pressure and load and keep structures stable and safe, corrosion resistance from specially treated surface coatings or alloy materials for harsh environments, and good processing performance so it can be bent, cut and processed to engineering requirements, which the source states improves construction efficiency.
DN1400
DN1400 is a steel pipe whose diameter can reach 1400 millimetres, described in the source as a giant pipe that plays an important part in transportation and support within modern engineering. Its stated characteristics are a large diameter able to transport large amounts of liquid or gas and suitable for high flow media, high strength and corrosion resistance from high-quality steel for complex engineering environments, and a choice of materials including carbon steel and alloy steel to meet different project needs. Manufacturing requires multiple processes, which the source lists as steel plate flattening, welding, cold bending, straightening and cutting, and it states that these steps need sophisticated equipment and technical support to bring the pipe to standard.
Application Fields by Size
DN219 is stated for four application areas. In building structures it is used for columns, beams and frames, and because of its diameter it provides sufficient strength and stability for the structural support of large buildings, with high-rise main structures and bridge supporting structures named as examples. In pipeline engineering it is used for oil, natural gas, water supply and sewage treatment, with a moderate diameter that meets certain fluid transportation requirements and gives good sealing and pressure resistance, and it is commonly used as a main pipeline in oil and gas lines. In mechanical processing it is used where thicker pipe is needed to support and transmit force, such as large mechanical equipment, construction machinery and bearings. It also appears in shipbuilding for supporting ship structures and separating compartments, in automobile manufacturing for strengthening chassis and frames, and in the metallurgical industry for exhaust systems in high-temperature smelting furnaces.
DN808 is stated for three application areas. In architecture it is commonly used as a load-bearing component such as support columns and trusses, to ensure the overall stability and safety of the building. In the oil and gas industry it is widely used in pipeline systems, where its corrosion resistance and high strength are stated to ensure safe operation. In manufacturing it is commonly used to make the main structure of mechanical equipment such as pressure vessels and conveying equipment, playing an important mechanical function. DN1400 is stated for oil and gas transportation as pipeline carrying high volumes, for municipal engineering such as urban drainage and water supply, and as part of bridge support structures where the source states it can firmly support heavy bridges and ensure safe operation.
How to Choose Between DN219, DN808 and DN1400
Choosing between these sizes starts with whether the pipe is carrying flow or carrying load. Where the duty is carrying flow, diameter sets capacity: the source states that DN1400 is suitable for transporting high flow media because of its large diameter, while DN219 has a moderate diameter that meets certain fluid transportation requirements with good sealing and pressure resistance, so it is used as a main pipeline in oil and gas service. Where the duty is carrying load, the source links larger diameter to higher bearing capacity, and states that DN219 has high strength and higher bearing capacity than smaller pipe, that DN808 is made of high-strength carbon steel to withstand large pressure and load, and that DN1400 has high strength and corrosion resistance from high-quality steel for complex engineering environments.
The second consideration is fabrication and handling, which the source raises for the two smaller sizes. DN219 is described as moderate in diameter and therefore easy to process and connect, and cheaper than larger diameter pipe, which the source presents as economical and practical, so it is often the sensible choice for structural, mechanical and general pipeline work. DN808 is described as easy to process and connect and able to be bent, cut and processed to engineering requirements, which improves construction efficiency, but it is large enough that it suits load-bearing components, oil and gas systems and heavy equipment rather than general smaller work. DN1400 is the opposite case: its manufacturing requires steel plate flattening, welding, cold bending, straightening and cutting, and the source states these steps need highly sophisticated equipment and technical support, so it belongs in projects that genuinely need the flow capacity or the bridge support that only a pipe of that size provides.
Material and corrosion protection are the third consideration, and the source treats them as the main way to extend life. For DN219 it states that corrosion resistance can be improved by selecting appropriate materials and surface treatment methods. For DN808 it states that specially treated surface coatings or alloy materials give strong corrosion resistance for harsh environments. For DN1400 it states that different materials can be selected according to project requirements, including carbon steel and alloy steel, to meet various engineering needs.
Selection rule drawn from the source material: first decide whether the pipe must carry flow or carry load, because that sets the diameter; then check that the fabrication, handling and installation method the project can support matches the size; then confirm the material and surface treatment that give the corrosion resistance the site requires. For a moderate 219 mm pipe the source presents lower cost and easy processing as the practical advantages, while for an 808 mm or 1400 mm pipe the project should need the pressure, load or flow capacity that justifies the larger size and the more demanding manufacturing route.
FAQ
What does DN mean in DN219, DN808 and DN1400?
DN stands for pipe diameter specification, and the number is the diameter in millimetres, so DN219 is 219 mm, DN808 is 808 mm and DN1400 is 1400 mm. The source states that pipe diameter determines load-bearing capacity and the scope of application in a specific project, which is why the designation is the first thing to check when specifying large diameter pipe.
What is DN219 steel pipe commonly used for?
DN219 is stated for building structures such as columns, beams and frames, for pipeline engineering including oil, natural gas, water supply and sewage treatment, for mechanical processing where thicker pipe supports and transmits force, and for shipbuilding, automobile manufacturing and the metallurgical industry. The source describes its moderate diameter as easy to process and connect and its cost as lower than larger diameter pipe.
What is DN808 steel pipe made of and what are its stated properties?
DN808 is typically made of high-strength carbon steel, and the source states it has excellent pressure resistance, wear resistance and corrosion resistance, making it suitable for complex environments. Its stated material properties are high strength to withstand large pressure and load, corrosion resistance from specially treated surface coatings or alloy materials, and good processing performance so it can be bent, cut and processed to engineering requirements.
How is DN1400 steel pipe manufactured?
Manufacturing DN1400 pipe requires multiple processes, which the source lists as steel plate flattening, welding, cold bending, straightening and cutting, and it states that these processes require highly sophisticated equipment and technical support to ensure the pipe meets standards and requirements. The source also states that the material may be chosen to suit the project, with carbon steel and alloy steel both named as options.
What are the stated advantages of DN219 pipe?
The source names four: high strength, with larger diameter giving higher bearing capacity and pressure resistance for large-scale projects; corrosion resistance, improved by selecting suitable materials and surface treatment methods; ease of processing, because the moderate diameter is easy to process and connect; and economic practicality, because DN219 costs less than larger diameter pipe while still being suitable for the applications listed.
Does the source publish numeric mechanical values for these sizes?
No. The source states diameters, applications and general properties such as high strength, pressure resistance, wear resistance and corrosion resistance, but it publishes no numeric yield strength, tensile strength, wall thickness or pressure rating for DN219, DN808 or DN1400. The sizes and mechanical properties for a specific project should therefore be confirmed against the applicable standard and the mill certificate rather than assumed from the DN size alone.
Tell us the DN size, the duty the pipe must perform, whether it carries flow or load, and the service environment, and our team will confirm the material and surface treatment suited to the project and prepare the matching mill certificate and inspection documents.
