In late 2015, MCOR assisted in rehabilitating a natural gas pipe at a Florida Power & Light (FPL) power plant located in Fort Lauderdale, Florida. This twenty-inch (20”) natural gas pipe with two standoff one inch (1”) pipes was in need of immediate repair. Both standoff pipes, along with their attachments to the main pipe, suffered from extreme erosion, and this effect was compounded by Corrosion Under Insulation (CUI). In addition to the corrosion issues, the surface was cold and constantly damp due to the condensation.
To gain more information about the substrate, including the wall thickness, FPL performed sonogram and X-ray tests as a preliminary step.The results showed that typical surface preparation methods could not be utilized due to the risk of further metal loss. The probability and risk associated with abrasive blasting or grinding tools puncturing through the pipes were too high; therefore, the possibility of getting the surface ready to accept any type of polymer coating near typical NACE or SSPC standards was eliminated.
The facilitating contractor, W9Y Construction, was faced with the challenge of finding a product that would be reliable, cost effective and surface tolerant. W9Y Construction contacted MCOR, manufacturer of advanced mechanical polymers, to determine if any coating solutions were available for this difficult scenario. The solution came from MCOR’s 3115 | mClad mFill multipurpose, structural-grade metal filler and metal repair paste.
The mClad mFill provides point-of-use application, and it is highly tolerant in challenging areas, such as damp substrates. This two-component, fast-set epoxy paste is packaged in a convenient 1:1 mix ratio.
This high-strength epoxy is an excellent solution for reclaiming, resurfacing, and patch filling metal. Epoxy-based and highly modified with fibers and ceramics, the material is a durable, sealed protective solution to combat corrosion.
The MCOR 3115 along with a mesh reinforcement provided an exceptional solution in this case for both adhesion and rebuilding metal walls with a reinforced polymer exhibiting structural-grade properties and high flexural strength to ensure lasting durability. It provided a long-term repair until the power company was ready to replace the pipe. In addition, it also protected the area from CUI should the pipe be insulated again.
To begin the repair, the deteriorated section was isolated, providing a dry substrate. With two men on the job and the ambient temperature in the low 80F range, the first coat was applied and allowed to cure overnight.
Reinforcement mesh was applied the next day after the area was thinly coated with a second coat of the MCOR 3115, allowing it to work its way through the mesh. A third coat was applied to finish the application. This repair provided an immediate solution, savings in both labor and product costs, and minimal down time. In addition, the product is easy to use and safe because it eliminates any welding or Volatile Organic Compound (VOC) issues.
PROJECT: Natural Gas Pipe Repair
OWNER: Florida Power and Light Power Plant, Fort Lauderdale, Florida
DATE: December 2015
PRODUCTS: MCOR 3115 | mClad mFill