Exhaust Stacks - Vancouver
Shipyards
Vancouver 2004
HOTPIPE COATING
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 HOTPIPE
COATING to
reduce the surface temperature from approximately 500F
( 260C ) down to approximately 250F
( 121C ) 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 100F - 200F ( 38C - 93C ) 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 500F 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.
