These stainless steel exhaust stacks are contained in an aluminum housing with limited clearance. It was therefore decided to apply only 1/4 " inch ( 325 mils WFT or 250 mils DFT ) of HOT PIPE COATING ® to reduce the surface temperature from approximately 500°F ( 260°C ) down to approximately 250°F ( 121°C ) as per the Temperature Reduction Chart.
The other major advantage over the traditional wrap and clad, in addition to the greatly reduced thickness required, is the elimination of CUI ( Corrosion Under Insulation ) thus adding to the life span of these exhaust stacks.
Mixing of the HOT PIPE COATING ® as per the application instructions.
Using Tiger Torches the surface temperature of the exhaust stacks were preheated to approximately 100°F - 200°F ( 38°C - 93°C ) to assist in the cure down.
Two primer coats were applied at approximately 65 mils WFT or 50 mils DFT ( 1/20 " ) each and allowed to steam off
Second primer coat being applied.
This provided a good bond coat prior to applying the build coat
The final build coat to the total of 250 mils DFT as specified.
The Tiger Torches were then turned up to bring the interior temperature up to the operating temperature of 500°F in an effort to accelerate the cure down of the build coat. This was challenging to achieve because even with just the two primer coats the heat was being blocked.
The " ATTESSA " under refurbishing.
