However, traditional repair methods can be both time-consuming and costly, often necessitating dangerous hot work. Belzona’s cold-applied solutions simplify maintenance procedures and extend the life of valuable assets. 

This blog post offers step one of a two-step guide for the protection of high-temperature vessels. First, mending pitting damage using Belzona 1511 (Super HT-Metal) and then part two, applying an overcoat of Belzona 1593 to ensure lasting protection against corrosion and chemicals. 

Part 1 – Repairing Pitting Damage on Process Vessels with Belzona 1511 (Super HT-Metal) 

Why Should Belzona Be Used to Pit-Fill High-Temperature Process Vessels? 

Before a vessel can be lined, it is crucial to carry out a pitting repair with a paste-grade epoxy material. Belzona 1511 (Super HT-Metal) is an ideal choice as it is a heat-resistant epoxy paste, specifically designed to repair and rebuild areas damaged by corrosion or erosion at elevated temperatures. It can withstand immersed service environments up to 150°C (302°F) and is dry heat resistant up to 210°C (410°F). Its excellent chemical resistance and durability make it well-suited to lining high-temperature process vessels. 

How to Pit Fill High-Temperature Process Vessels with Belzona 1511 (Super HT-Metal) 

Step 1: Surface Preparation 

To ensure a successful pit-filling application, proper substrate preparation is essential. First, the surface must be grit blasted to Swedish Standard Sa2½ (near white metal finish) with a minimum profile of 3 mils (75 microns). It is also vital to ensure the soluble salt contamination levels are below 20mg/m2 (2ug/cm2). Throughout the preparation and application process, environmental conditions should also adhere to those laid out in the Instructions for Use (IFU). This preparation ensures the Belzona 1511 (Super HT-Metal) will adhere strongly to the vessel’s surface. 

Step 2: Mixing the Product 

Next, measure out Belzona 1511 (Super HT-Metal) at a metric ratio of five parts base to one part solidifier. Mix the two parts thoroughly, using a figure of eight motion, to achieve a uniform streak-free grey colour.

Step 3: Apply the First Coat 

Once mixed, carefully use a brush to wet out the substrate with an initial layer, pressing hard into crevices as this helps to prevent air entrapment. Then move on to rebuilding with more product, using a Belzona applicator to restore the surface to its original profile. Ensure the product is spread evenly and covers the entire damaged area. 

Step 4: Leave to Cure 

Finally, allow the Belzona 1511 (Super HT-Metal) enough time to cure, forming a strong durable repair. Please note the length of time taken to cure varies depending on application temperature so be sure to consult the IFU for specific timings. 

Read Part 2 of the Article Here

Watch This Video to See the Application in its Entirety: 

The post How to Repair and Protect High-Temperature Process Vessels | PART 1 appeared first on Belzona Blog.