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Driving Innovation Below Ground.



Predictable, Quantifiable Retaining Wall Systems for All Soil Types

O-Pile® is a leader in predictable, quantifiable retaining wall systems that can be driven in all soil conditions. O-Pile® systems are a stronger, more efficient, durable, faster and cost-effective alternative to heavy Z-sheet pile, combined sheet pile utilizing pipes or beams, slurry, secant, continuous concrete walls and other conventional concrete constructions. 


O-Pile® Attributes

1. Bending Moment Capacity (BMC)

O-Pile® systems typically have a higher strength to weight ratio when compared to Z, U or combined sheet pile walls as they can be made using high strength coiled steel that exceeds the capabilities of hot rolled sheet pile, allowing for a much larger Bending Moment Capacity. For example O-Pile® is available in X80 to provide 80,000 yield strength, where by hot rolling sheet piling is limited to less than 65,000 and typically uses steel with a yield strength of 36,000 or 50,000. The selection of the steel grade has a marked impact on the structural resistance of the pile wall. Selecting a stronger steel grade such as X70 or X80 often allows using piles of smaller diameter or wall thickness. 

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*Sheet Pile LLC is the owner and assignee of numerous patents and trademarks related to the O-Pile® system, including, but not limited to, United States Patent Nos. 8,088,469, 8,323,765, and 7,935,406.


Get In Touch

O-Pile® systems are available for immediate shipment, regardless of your load-bearing, durability needs, or location.

Call us at 866-666-PILE (7453) or +1-512-243-1228

Email us at

Fill out a contact form and we will respond by the next business day.

2. Strong Efficient Connection

WOM/WOF connectors have an interlock strength of 19.5 kips/inch (3418 kN/m); Figure 1 on the right clearly shows the high pull-out resistance of this connection which is over 4 times stronger than Larssen interlocking hot rolled sheet pile made in Luxembourg or China. 

3. Superior Geometry for Durability

Each WOF/WOM connection provides 20 degrees of rotation to ease placement. O-Pile® has a distinct advantage over combined, Z and U sheet piles: O-Pile® saves costs with easier application of corrosion protection compared to other geometries, and by having a minimized exposed surface (See figure 2). 

Furthermore, the interior of the pipe can be sealed off (capped or filled) from oxygen infiltration in order to avoid inside corrosion. Also, concrete can be poured inside the O-Pile® itself, thus further increasing strength while also preventing oxidization or corrosion on the interior surface, so O-Pile® have only the exterior face exposed to corrosion. This is in contrast to a beam king pile, which has all of its surface faces exposed to corrosive elements. O-Pile® used in corrosive soil and/or water need only have corrosion allowance factored for the exterior surface of the pile. 

4. Positional Flexibility

Each WOF/WOM connection provides 20 degrees of rotation to ease placement. 

5. Unmatched Strength

O-Pile® systems offer unmatched efficiency particularly where high capacity structures are involved. O-Pile® systems achieve strength by increasing pipe diameter, which spreads weight gained over an increased width. This minimizes weight gain per sqft (sqm) and radically improves efficiency. This is in stark comparison to how a beam-based combi-wall system develops strength. 

To illustrate this efficiency, below is a comparison of strength to weight for an O-Pile® system and a King pile system. 

6. Load-Bearing Capacity

The surcharge and lateral load-bearing capacity of pipe sheet pile is significantly higher than standard U- or Z-type sheet piles or combined wall systems of similar weight, because of its natural geometry. 

When To Use O-Pile®: DTH (Down the Hole)

Environments and Uses

O-Pile®: DTH systems can be driven into environments where the rock strata exceeds 120 megpascals or other difficult environments at levels of productivity not achieved before by using the state-of-the-art Down-the-Hole (DTH) drilling technique. 

Development of new Down The Hole (DTH) techniques, especially the introduction of new air control bits, is making DTH drilling safer and more environmentally friendly than ever before. Using DTH in urban areas and in sensitive ground is now possible; plus, there is no danger of overdrilling or air escaping, which could otherwise cause settlements to existing structures. 

O-Pile® is an economical and reliable solution that suits all ground conditions. The product is on hand and ready to ship to most US destinations within two weeks to most destinations in North America. 


  • When applied correctly by a professionally trained crew, WADIT® sealant is impermeable. After application, the contractor can proceed with sheet pile installation without any limitations, irrespective of the driving method or environmental conditions. Notably, WADIT® is the only sealant specially formulated to meet the precise requirements of sheet pile applications. 

  • Upon completion of the installation, you will be provided with a WADIT® Test Report (WTR) encompassing installation particulars, along with a unique WADIT® certificate number for authentication purposes.

  • WADIT® is flexible and thus offers unique elasticity. Other swell type sealants material become rigid and fracture which may cause leaks. WADIT® tolerates torsion and movements in the sheet pile interlock maintaining an absolute seal.

  • In testing, the system was subjected to a maximum water pressure of 5 bar (= 500 kPa, or more than 130 feet of water pressure depth), which represents almost twice the safety margin over maximum water pressure levels measured in the past. It was the opinion of those administering the test that WADIT® likely could have withstood an even higher water pressure. 

  • Yes. Utilizing WADIT® on sheet pile acts as a protective barrier against corrosion, effectively slowing down the oxidation process.

  • In the time it takes to pick up the sheet pile with the crane, your WADIT® protected sheet pile is ready to be installed. 

  • Indefinitely. There are no restrictions.

  • WADIT® can be used/installed with any and all sheet pile types, hot or cold rolled, paired or unpaired, that are currently on the market today.

  • Yes, this service can be scheduled for a nominal fee, and the cost can be credited towards a future order. 

  • Yes. WADIT® remains flexible in temperatures below 20 degrees Fahrenheit.

  • Yes. WADIT® does not become viscous until temperatures over 250 degrees Fahrenheit.

  • Yes.


  • Yes.

  • Yes.

7. Superior Durability

O-Pile® systems have a distinct advantage over Z,U and combined sheet piles by having a minimized exposed surface. O-Pile® only have a corrosion allowance factored for the exterior surface of the pile, unlike the other systems. section modulus increases, there is a minimal increase in weight. This is in direct comparison to the steep gain in weight a King pile beam system experiences to obtain a similar gain in strength. K1 O1 K2 O2 

8. O-Pile®: Mariner = Double Pipe thickness

Double Pipe Thickness– allows you to “dial-in” thickness to meet your specific structural load and durability needs to ensure overall safety. Thickness can be increased specifically at the splash- and low-water zones for increased durability (See Figure on the right). Additional costly measures, such as coatings, special steel grades or cathodic protection, become unnecessary. This gives the most efficient use of steel and the most cost-effective solution for durability. 

O-Pile® Mariner’s double pipe thickness targets design life and the use of sacrificial thickness, exactly where you need it–the “Zone of High Attack.” With a 100’ pipe, the thickness of the upper 10’ of pipe (denoted by arrows) beats the corrosion allowance, while the bottom 90’ of the pipe is dialed-in to meet load bearing needs (See Figure 3). 

9. Increased Savings

The increased Bending moment capabilities of O-Pile® allow the user to construct a stronger wall using much less steel, and hence at a much lower cost. O-Pile® works with our customers to ensure we meet your specific project needs. We don’t just sell you a product, we enter into a partnership that starts at the design stage and extends through implementation. Simply put, we deliver the most technically advanced and highly economical system available. Since we locally source pipes, we can always help you find the correct pile size in a broad range of steel grades, which allows you to implement a retaining wall or foundation structure with the best overall economy for all soil conditions and loading situations. O-Pile® offers a truly unmatched proven solution. 

10. Ease of Installation

An O-Pile® is much less challenging due to one single fact: O-Pile® are supported throughout their installation, whereas combined sheet pile systems are not. Installation using WOF/WOM connections are simplified by the use of a template and panel installation method. The installation of the O-Pile® section is similar to driving Z sheet pile pairs in a basic two frame template. At no stage is there a pipe pile entirely unsupported throughout its length as it is driven to grade. Each pipe is supported by adjacent pipes with a small lead ahead of the rest, ensuring accurate wall alignment.

11. O-Pile®: via WADIT System = Watertight wall

WADIT, the globally proven sheet pile interlock sealant, comes pre-applied in the WOF interlock chamber before delivery to the job site. A purpose-built and globally proven sheet piling interlock sealant system, WADIT (short for WASSERDICHT, German for waterproof) is an environmentally friendly sealant that was developed to deliver robust water-stopping protection. WADIT is available for use anywhere with any type of sheet pile, including but not limited to O-Pile® and Z-Pile. The WADIT system can be utilized before driving sheet pile, in the middle interlock of already paired sheet pile and after the sheet pile has already been installed. 

12. O-PILE®: DTH (Down the Hole) Drilling

O-Pile®: DTH utilizes state-of-the-art DTH drilling techniques that allows its systems to be driven into any ground or rock strata at levels of productivity not achieved before. DTH drilling has been used in these challenging environments: post glacial soils of Norway, boulders of Sweden, granite of Finland, deep bed rock of Hong Kong, through heavy structure in Macau, etc. The O-Pile®: DTH Pile is installed with the centric drilling method using ring bits of a larger diameter than standard bits. The ring bit drills a hole larger than the pile to accommodate the WOF/ WOM connectors. Diameter from 16” (323mm) to 36” (914.4mm), ranging from a wide range of diameter pipe can be installed using O-Pile®: DTH. See O-Pile® DTH Grid on page XX. 

Predictable, quantifiable installation is possible even with difficult driving conditions, such as bed rock or job sites with heavy debris. Compared to driving a conventional combined sheet piles with beams or pipes, the installation using an O-Pile®: DTH system is much less challenging due to one single fact: O-Pile®systems are supported throughout their installation, whereas King pile combi-wall systems with pipes and beams are not. 

Installation using flexible strong WOM/WOF connections are simplified by the use of a template and panel installation method. 

The installation of O-Pile®: DTH Piles is similar to driving sheet pile pairs in a basic two frame template. At no stage is there a pipe pile entirely unsupported throughout its length as it is driven to grade. Each pipe is supported by adjacent pipes with a small lead ahead of the rest, ensuring accurate wall alignment. (See Figure 4.) 

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