Pipe Wrap

Our Pipe Wrap system is a durable, easy-to-use solution that’s ideal for protecting your pipes against corrosion, abrasion and impact in piping applications for petroleum refineries, chemical handling and mining. The material is impregnated with fiberglass tape that adheres to PVC, metal pipes and will work underwater. The Pipe Wrap system is designed to repair leaks up to 450 psi while resisting heat and harsh chemicals.

Applications

  • Corrosion 

  • Abrasion 

  • Impact in piping applications 

  • Underwater repairs 

  • High heat 

  • Harsh chemicals

Applications

  • Corrosion 

  • Abrasion 

  • Impact in piping applications 

  • Underwater repairs 

  • High heat 

  • Harsh chemicals

Pipe Wrap

 

Milliken Infrastructure Solutions is proud of the versatility and durability of our Pipe Wrap system to provide a safe, strong repair. If you would like technical data, please contact us. 

 

Applications

• Petroleum refineries
• Chemical handling
• Mining

Benefits

• Emergency offline leak repair
• Drinking water safe
• Bonds to any pipe
• Quick to set and easy to use

System Properties

  • Repairs leaks up to 450 psi
  • Apply in dry conditions
  • Resistant to most harsh chemicals

 

FAQs
Pipe Wrap Composites
Have questions? Check out our frequently asked questions regarding our Pipe Wrap composite wrap systems. Contact us if you would like to know more.

Milliken Infrastructure Solutions currently provides solutions for these industries:

  • Oil & Gas:
    • Plants and Refineries
    • Transmission Pipelines
    • Marine and Offshore
    • Storage Tanks
  • Industrial
  • Municipal
  • Mining
  • Power Generation 

Browse our pipe repair and engineering solutions in our interactive Oil & Gas industry map. 

There are many variables to consider when designing a composite repair, including: 

  • operating pressures and temperatures
  • defect type and severity 
  • pipe geometry
  • external or internal chemical presence 

Finding a product that is engineered to the exact specifications of a given scenario will not only offer the best design required to provide a functional and lasting repair, but it can also reduce costs. There are many other conditions, such as bending or combined loading, that the repair must address. 

These conditions can more easily be considered if the repair is custom designed instead of assuming that an off-the-shelf product has already considered these loads. “Pre-designed,” ready-made repair products should only be used to address very specific situations, which should be clearly and plainly understood by their manufacturer and communicated to you. 

Read a more detailed answer under Misconception 1 in our white paper: “5 Common Composite Repair Misconceptions.”

The universal answer, no matter who the manufacturer, is yes. Inspection standards can be vague and the development on education is lacking, but it’s the responsibility of the operator, who is the final decision-maker on product selection, to know if the composites have been inspected for use.  

There are several non-destructive tests (NDTs) to analyze defects within the pipe’s walls and the surrounding composite material, regardless of composite the manufacturer. 

  • Tap Test
  • Phased Array
  • EMAT
  • Pulsed Eddy Current
  • Digital Radiography
  • Microwave
  • Thermography 

Read a more detailed answer under our Composite Inspection: Non-Destructive Tests (NDTs) document or under Misconception 2 in our white paper: “5 Common Composite Repair Misconceptions.” 

The words “temporary” and “permanent” seem to mean something different to each operator, manufacturer and auditor. A general definition for both could be:

  • Temporary repair: the repair is installed for a specified, usually short, amount of time with scheduled inspections or a planned service removal
  • Permanent repair: the repair is installed without requirements for inspections other than routine, entire-pipe inspections 

All internal wall loss defects, external abrasion or extremely high fatigue scenarios will be treated as temporary, as well as cracking in the composite or further corrosion growth under the repair. If no growth is expected, however, meaning the current and end-of-life conditions are predicted to be the same, then a permanent composite repair becomes a viable option, but not before considering composite creep and cyclic fatigue life of the composite and the pipe.  

Read a more detailed answer under Misconception 3 in our white paper: “5 Common Composite Repair Misconceptions.” 

As it currently stands, composite repairs should only be considered a temporary repair for situations where the crack or crack-like feature cannot be removed without additional, focused testing. As a temporary repair, composites can bridge the gap until a more permanent solution can be installed. 

Read a more detailed answer under Misconception 4 in our white paper: “5 Common Composite Repair Misconceptions.”

Maintenance engineers should pay close attention to a product’s fabric or laminate construction. Uni-, bi-, tri- or quad-directional fabrics are important structural characteristics to make sure you’re selecting the right composite for your repair. 

  • Uni-directional: The fibers in this material are oriented and aligned in a single direction, making these fabrics extremely strong in that direction but extremely weak to any loads not parallel with the fiber construction.  

  • Bi-directional: These fabrics are created in a 0°/90° woven configuration, which can support both the hoop and axial stresses if designed accordingly, but it’s weak when exposed to torsional or shear forces along the 45° line. The thin composition of bi-directional fabrics makes them relatively flexible and easily formed to complex shapes when wet or dry. 

  • Tri-directional: The fabric is typically engineered in a stacked fashion (great for leak repairs) with strength in the hoop direction. The alignment along the 0°, +45° and -45° lines provides greater load-bearing capabilities and makes it the best option for conforming to irregular shapes. 

  • Quad-directional: This composite is relatively strong in every direction and is ideal for leak repairs due to its strength and sequencing. Its thick- and stiffness in all directions makes these fabrics extremely difficult to apply to complex shapes. Quad-directional fabrics have the highest average overall strength and modulus in stress but the lowest in any single direction. 

  • Randomly oriented: These fabrics contain no directional preference and are typically used in low-stress applications in a preventative measure because their construction provides minimal strength.  

Read a more detailed answer under Misconception 5 in our white paper: “5 Common Composite Repair Misconceptions.”

  • Tap Test: A great preliminary test to determine if further inspection is needed. An inspector uses a metal object, like a quarter, to tap along the outside of the composite and use the resulting sound to determine if a defect exists within the composite. More sophisticated methods exist for this form of testing: Tap Hammer, RD3 and CATT 

  • Phased Array: This ultrasonic method can be used to detect defects within the pipe, voids between the pipe and the composite repair, and the voids or delamination within the composite itself. The results can be viewed as either a C-scan (2D, top-down view) or a B-scan (2D, side-on view) 

  • EMAT: This method inspects pipes and composites by producing electromagnetic waves that interact with the conductive materials found in some composite repairs, which give off their own electromagnetic waves. The combination of the waves creates sound waves that are used to locate damages and defects. EMAT does not need to come into direct contact with the inspected area. 

  • Pulsed Eddy Current: This electromagnetic testing method uses a transmitter to produce alternating currents that induce looping currents, or eddy currents, in nearby conductive materials—in this case the substrate. Existing defects interfere with the flow of the current and are presented in the form of a color-coded grid based on severity of wall loss. 

  • Digital Radiography: This method, also known as X-ray, uses penetrating radiation to inspect delamination and disbanding within the tested materials and find defects in both the composite and the pipe wall. This option is primarily chosen for pipes that are already completely exposed. Transmitted waves that haven’t been interrupted by defects help form an image that gives an actual photographical representation of the insides of the pipe or composite.  

  • Microwave: This method detects delamination and disbonds in non-conductive materials, so not carbon fiber composites. Transmitted waves are reflected back when meeting a void or discontinuation in material, and the voids are identified as areas of delamination, disbonding or gouged composite and case the microwaves to be reflected back to the inspection instrument at a different rate.  

  • Thermography: Thermography can find defects by detecting the change of thermal activity within a material and creating a heat map of the surface of a stressed object by using an infrared camera and equipment. This method is better suited for defects closer to the surface because of the energy required is higher the deeper the defect is in the ground. 

Read a more detailed answer under Misconception 2 in our white paper: “5 Common Composite Repair Misconceptions.” 

Our Products At Work in the Field


Pipe Wrap® System: Leak Repair


Gulf of Mexico
November 11, 2012

Project Overview
Located in the Gulf of Mexico, an offshore Truss SPAR was experiencing significant degradation and needed an immediate repair. Three alternating stainless steel piping sections supplying seawater ballast for the SPAR were corroding in a variety of locations and had active leaks in all three lines.

There were approximately 39 leaking areas in both the pipe runs and tees on the three 10” lines (A, B, and C) that were all 14 feet above the deck. It was difficult to be sure of the exact number of leaks, as some areas were covered with a variety of clamps, tapes or screws.

Repair Solution
The first step for the repair was to erect scaffolding and create a safe work area for the two-man crew. Alternating shutdowns were scheduled and the individual lines were depressurized one at a time. All existing repairs (clamps, tapes, screws, etc.) were then removed to enable sufficient preparation.

All three pipelines were prepared using a side grinder to remove rust and scale build up, bringing the pipe down to bare metal. Additionally, a solvent wipe was used prior to the application of epoxies.

On line A, the holes and anomalies were filled with epoxy. Then, an epoxy primer was applied circumferentially, and on an overlap repair zone axially by 3-4 inches. Next, 24 layers of Pipe Wrap® were applied. On lines B & C, after preparing the entire line, the holes and anomalies were filled with epoxy, then epoxy paste was applied from the 3 o’clock to the 9 o’clock position, as all previous leaks appeared to be in the bottom 180˚ of the piping. Finally, epoxy primer was applied to the remainder of the bare piping and finished with 24 layers of Pipe Wrap repair material.

Results
The end user was able to successfully repair the offshore Truss SPAR and stop the active leaks, while the Pipe Wrap system helped extend the life of the pipeline.

Pipe Wrap_Truss SPAR_Gulf of Mexico_BeforePipe Wrap_Truss SPAR_Gulf of Mexico_After

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