Denso Protal high temperature coating for pipelines offers fast curing

Protal 7900HT is applicable by brush or spray.

Pipelines have received innovative protection from Denso North America for decades. The lineup includes liquid pipeline coatings, like the unique Protal 7900HT: a high temperature coating that can be applied by hand or spray in one coat, in the field or the shop. The top advantage is its fast curing.

By curing quickly, Protal 7900HT allows fast back fill when applied to hot pipes. This is ideal for girth welds, pipes, fittings, valves, and fabrication with pipelines at temperatures up to 121 degrees Celsius.

One hundred per cent solids

This is a VOC-free, 100 per cent solids epoxy coating with other advantages, like high build of up to 1,524 microns in one coat, high adhesion, intermittent service temperature as high as 150 degrees Celsius, low permeability, abrasion resistance, and excellent self-levelling characteristics. This high temperature coating meets the CSA Z245.30 and AWWA C-210-92 standards; it also does not shield cathodic protection and is environmentally safe.

Other technical specifications for this Denso high temperature coating: white base component, black hardener, and grey mixed material; mixing ratio of three parts base to one part hardener in volume; pot life of 30 minutes at 25 degrees Celsius, or 15 minutes at 36 degrees Celsius; coverage of 0.7 to 0.9 square metres per litre; thickness from 635 to 1,524 microns; adhesion to steel of 3,030 pounds per square inch.

To apply Protal 7900HT by brush, the first step is to prepare surfaces by grit blasting to a clean, near-white finish, then stir the base and hardener, add hardener to base, and mix slowly until achieving a constant colour. The mix is poured onto the surface and brush, trowel, or roll to the required mil thickness. Preheat the surface with a propane torch or induction coil for a faster cure for surface temperatures under ten degrees Celsius.

Spray application begins with grit blasting and should be done with a plural component airless spray unit with a proportioning pump that mixes at a volume ratio of three to one. A wet-on-wet spray technique typically leads to minimum thickness of 635 microns.

For more information, contact Denso.

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