Nucor Skyline

Spiralweld Pipe

Nucor Skyline has vast experience in manufacturing pipe piling products for the North American steel foundation industry. With our strategically located manufacturing plants, we can service the steel needs of any public or private project throughout the region.

Properties of Nucor Skyline Spiralweld Pipe

  • Outside diameters up to 120”
  • Wall thickness up to 1”
  • Custom Lengths and Thicknesses
  • Custom Fabrication Services
  • Accepted by DOTs in Seismically Active Areas
  • In-house and Third-Party Testing Capabilities
  • Melted and Manufactured in the USA

Applications of Nucor Skyline Spiralweld Pipe

Bearing Pile

Deep foundations are required when the shallow soils are not strong enough to support the loads from the structure. Pipe piles are commonly used in deep foundations and transfer the loads from building to stronger soil layers found deep underground. The loads are resisted through skin friction and point bearing. Pipe can be driven either open-ended or closed-ended, with points or plates. If driven with plates, the pipes can then be filled with concrete to add strength to the pile. Usually the money spent on plates, rebar, and concrete would be better spent on a larger, thicker pile. Pipe piles range in size from several inches to several feet in diameter and can be easily spliced to create piles hundreds of feet in length.

Drilled Shaft Casing

Pipe casing, temporary or permanent, is often required during the construction of drilled shafts. The casing is used to hold the hole open while the reinforcement cage and concrete are installed. The ability to inspect the bottom of the hole and the elimination of any variations in the diameter of the finished drilled shaft makes for a much higher quality, finished pile. In the “Standard Guidelines for the Design and Installation of Pile Foundations” ASCE recommends a factor of safety that is 38% higher on the structural capacity of drilled shafts without casing, than those with casing.

Combination Walls

Large diameter pipes have high bending strengths and are often used in combination sheet pile walls. The combination of large diameter pipe piles and steel sheet piles, which is often referred to as combi-walls, pipe-z walls or king pile walls, makes a very efficient system. Like other combined walls, the king pile takes the majority of the load and the sheet pile transfers the load to the pipe and to the soil.

Structural Sections

The symmetry of pipe gives it the same bending strength, in any direction, which makes it an excellent product for the resistance of buckling. The stress required to buckle an axial member decreases with length. The radius of gyration has the opposite effect and increases the ability of a section to resist buckling. The W and HP sections have differnt radii of gyration (rx and ry) for the X and Y axes, while remaining constant for a pipe. The end result is that a pipe can take much higher loads for long, unsupported lengths.

Jacked & Bored Pipe

The placement of underground utilities is often done with jacked and bored pipe. Sections of pipe are pushed through the ground with hydraulic jacks between excavations or under a hill. The next section of pipe is then spliced onto the first and the jacking continues. Once the jacking is complete, the pipe is cleaned out to install the utilities. This allows the placement of utilities without extensive excavation which can disrupt roads, railroads, homes and businesses.

Sewer/Water Line Pipe

Welded steel pipe provides an effective method for transporting liquids, air, and gas. Steel Pipe is pound per pound stronger than any other type of line pipe. Pipe can be designed to handle both the internal and external pressures of most applications. Welded steel pipe offers many advantages, such as: strength, economy and ease of installation. Nucor Skyline is SPFA certified and manufactures hydrostatically tested pipe in outside diameters ranging from 10-3/4" – 90". Our production process utilizes a double submerged arc weld process in both spiralweld and rolled & welded pipe. Hydrostatically tested pipe lengths range from 30' – 60', wall thicknesses from 0.250" – 2.0" wall and produced to one of the following industry standards: AWWA C200/ASTM A139/ASTM A134.

Advantages of Using Nucor Skyline Spiralweld Pipe

There are several benefits to using spiralweld pipe. As mentioned, spiralweld pipe places less stress on the seam than its straight seam counterpart, allowing it to withstand more pressure. Spiralweld pipe is more flexible and customizable, allowing for larger diameters and longer lengths with varying levels. Another benefit of spiralweld pipe is that it is efficient and cost-effective, creating greater possibilities for less.

Manufacturing Process

Spiralweld uncoiling

UNCOILING

Upon receipt of the coil, it is placed on a horizontal uncoiler mandrel and fed into the straightener.

FLATTENING

The strip of coil is introduced into the flattener through a roll stand and the coil set is removed.

JOINING OF THE COIL ENDS

As the coil continues to move through the straightener, the leading and trailing edges of the strip are trimmed in preparation for butt welding – coil to coil.

EDGE MILLING

The edges of the coil are trimmed with carbide teeth to prepare for welding.

PIPE SPIRALING

The strip of coil enters the three roll apparatus composed of lead, buttress and mandrel roll sets. At this stage, the coil starts to form the spiral shape that will then become pipe.

pipe welding

PIPE WELDING

The welding system welds the pipe, first along the inside diameter and then along the outside diameter, using a submerged arc welding process.

Quality Control

QUALITY CONTROL

Once the welding is complete, the finished pipe is visually inspected by Quality Control (QC) and, if required, Ultrasonic (UT) testing is performed to ensure the weld is defect-free.

Cutoff

PIPE CUT-OFF

Once the pipe reaches the desired length, the cut-off machine is engaged. Traveling with the pipe, a plasma torch provides the cut-off of the finished pipe. Specific end props, such as bevel or square cut ends, can be requested to allow for simpler splicing in the field.

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Case Study: Rukert Terminal

Case Study: Rukert Terminal

A steel solution that not only addressed the existing wall problem, but also upgraded the port structure to meet future vessel requirements. 

Download Case Study

Pipe Brochure

Pipe Brochure

Learn about our comprehensive line of steel pipe products. 

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Technical Product Manual

Technical Product Manual

Get all the information you need about Nucor Skyline's complete line of steel foundation products. 

Download Product Manual

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300 Technology Center Way, Suite 450, Rock Hill, SC 29730
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