SÄKAPHEN Lining of Heat Exchanger

Client

Specialist Marine Condenser Fabricator

Scope of Work

Preparing and Lining Tube Internals and Tubefaces

Products

Sakaphen Si57E

Substrate

Carbon Steel

Coating System

The Cargo Condenser tube internals and tube faces were initially pre-cleaned by jet washing with a degreasing agent to remove surface deposits and contamination prior to being grit blasted to a cleanliness standard of Sa3 in accordance with ISO 8501-1:2007 with an average surface profile of 30 to 60 microns. The lining is applied from solution in a series of thin layers, with an air dry period between coats and a low temperature stoving to assist solvent release and part polymerise the resin. Conventionally

25-40 microns are applied at each coating application. When the lining has attained the specified thickness and continuity, the final cure is completed by placing the Cargo Condenser in the stoving oven and raising the temperature to 200°C. The exact duration and the rate of temperature rise is dependant on the mass of the item being stoved. The lining is tested for thickness, continuity and cure once cooled.

Coating Details

One of the Sakaphen range of thermal hardening Sakaphen Resins, Sakaphen Si57E is a Phenol Epoxide resin lining applied to pipework, heat exchangers, condensers, evaporators, water treatment equipment operating at temperatures up to 180°C in certain cases. Sakaphen Si57E is particularly suitable for cooling waters including brackish and seawater, salt solutions.

Photographs

Left: Cargo Condenser prior to lining
Right: Sakaphen Si57E lined Cargo Condenser