In a recent Tanks & Terminals article, Ted Huck discusses a tank cathodic protection retrofit project in the Middle East utilizing horizontal directional drilling technology.
Originally constructed in 1995, the original design of this critical service ethylene storage tank included a cathodic protection system to protect the external tank bottom in contact with the ground. Over time, the system stopped providing enough current to meet NACE criteria for the control of corrosion.
Discrete Anodes Along the Tank Perimeter Not Satisfactory
The first retrofit cathodic protection system consisted of installing discreet anodes around the perimeter of the tank. While relatively easy to install, this method of retrofit installation often struggles to drive current to the full tank bottom. The results were not satisfactory so another method was needed.
Linear Anodes Installed Using Horizontal Directional Drilling
MATCOR had proposed an alternate approach, successfully being performed in the US but not tried previously in the Middle East. It involves the installation of multiple strings of linear anodes directly below the tank using horizontal directional drilling (HDD) technology. By drilling under the tank, it is possible to install anodes spanning the entire length of the tank. This method also allows for a testing device to measure the effectiveness of the cathodic protection system.
Click below to read the full article regarding this tank retrofit cathodic protection system, installed successfully in December 2019.
But that is not all, MATCOR is very excited to roll out a new capability to our service line. We have purchased two state of the art Vacuum Excavators.
These two new vacuum excavators are dual air and water units allowing MATCOR’s crew to operate efficiently in a wide range of environments. “Big Air” compressor capability provides 300 lbs. of cutting capability, enabling us to excavate in many areas without the need for water.
The excavated material is vacuumed up in a dry form with significantly less mess and environmental impact. This allows for the expeditious backfilling of the excavation with the same material that had been removed. It also eliminates the need to haul off any spoils or haul in fresh fill materials.
Our new excavators are dual capable units that also incorporate a hydro excavation capability. High pressure water is more aggressive and can cut through virtually any soil type including more compact, rocky and dense soil that may preclude the use of air. The hydro capability is also great for cleaning the pipeline once excavated to enable physical inspections and making test station or negative connections.
MATCOR is excited to be adding vacuum excavation to our in-house construction capabilities allowing us to provide a wide range of additional services to our customers.
If you have questions, or for information on MATCOR’s construction capabilities, please contact us at the link below.