The build-up concrete magnified shell-shape natural draft cooling towers are exquisite structures. However, they are often bared to harsh wielding environments which can lead to a grave concrete slump.
An assessment was executed to single-out the root cause of deterioration, to boil down their structural integrity, and to flourish a repair strategy that would give the design a boosted life of 25 years. Chloride induced corrosion was promptly crippling the aging structure and it was then buckled-down that the concrete repair only would not bring about the service life broadening. Therefore, as a part of the cooling tower improvement, you can compose and lodge a tailor-made electronic protection system to equip long-term solutions to the design’s corrosion dilemma.
Here in this article, we can learn about how to sustain the natural draft cooling tower and at the least for 25 years. Read on to find out how:
Let’s learn about Repair Development: repair & construction:
With scrutiny to safety, cost, and durability, an objective was carried out to achieve a service life span expansion of natural draft cooling tower for at minimum 25 years, whilst repairing the cooling towers without tweaking its design. To win this, the cooling tower nest on “stand-by” to accord as much of the repairs as possible and curtail operational downtime.
By the virtue of lapse and delamination in the upper section of the tower shell, it was determined to function an engineered demolition and reconstruct of the shell above the throat. On the other half part, that is below the throat where the concrete degradation was less severe, confined partial depth concrete repairs at both the interior and exterior of the shell were chosen. In which the X-columns were sustained to have enough quantity in their current deteriorated state and did not need to be restored to their original design strength. As a result, the X-columns were repaired in order to maintain their current structural capacity by the way of applying the mitigation strategy to it.
Cathodic Protection Design and Installation Process
This protection design is useful due to its reliable and adaptable repair strategy to protect tower shells and X-columns from continued deterioration. The impressed current cathodic protection was implemented for its shell-based structure and its ability to control voltage levels at a variety of locations of the large shells over the course of the system service life.
There are 3 types of ICCP systems that were used on various sections of the shell. The Ebone Discrete Titanium suboxide ceramic anodes were used in the heavily reinforced, thickened concrete base of the shell. These anodes were grouted into the slots cuts into the cover concrete to cover the repaired height of the current shell and mixed metal oxide coated titanium ribbon mesh anode was then cast between the increasing layers in the repaired portion of the shell above the throat of corrosion prevention.
Moreover, each of its vertical stacks is maintained by a rectifier and controlled by a remote monitoring unit. You can control the Remote monitoring unit(RMU) by an internet-based software to assess current, voltage, potentials, and also execute polarization decay testing.
On the other hand, the GCP also known as Galvanic cathodic protection through galvanic jackets was chosen for the X-columns established on the basis of the durability of its components within the harsh basin surroundings. The Galvanic jackets contain alkali-activated distributed in different zinc anodes installed with cement motor inside built-in fiber-reinforced polymer forms.
The galvanic anodes basically steer as low-voltage batteries furnishing protective current to the column supporting steel. These process does not demand any monitoring or upkeep to implement long-term corrosion protection. It is suitable for usage in wet surroundings and can be equipped without external junction boxes or conduit which you can fill with water and edge towards wiring failures. Few of the X-columns were furthermore instrumented and connected into the monitoring devices.
This above article is regarding a complete design-build answer to address the corrosion of the reinforcing steel inside the natural draft cooling tower. And as a result, the cooling tower guidance will now be able to sustain while providing reliable service for the upcoming 25 years. Get in touch with us.