Industry:
Mining and Mineral Processing,
Date:
April 2010,
Substrate:
Steel multi-stage pump casing, galvanised coupling,
Products:
Epo-chem™ RW 500 – Solvent Free Novolac Epoxy,
Environment:
80°C corrosive aqueous ammonia,
Challenge:
The client required an external coating system to provide long term protection to their newly purchased multi-stage pump assemblies against an aqueous ammonia environment at elevated temperatures. The coating system was required to act as a corrosion barrier for the pump case should any leaks occur whilst in service. Abrasive blasting could not be deployed due to the risk of damaging critical components.
Chemco’s Solution:
We recommended RL 500PF which primes and finishes in 1 coat. This coating system requires minimal surface preparation. It is moisture/surface tolerant coating is ideal for site. Rain or high humidity has no effect on painted surfaces.
We followed this with RW 500, a solvent-free epoxy Novolac which imparts outstanding protection to metal substrates. It forms a durable barrier resistant to abrasion, erosion, thermal shock, and the most aggressive environments of high temperature and chemicals in immersed and non-immersed conditions.
Scope:
- Mask off seal areas, ID plates and critical exposed fittings. Mechanically prep surface, solvent wash with MEK
- Prime with 1 coat RL 500PF to prepared surfaces
- 2 coats RW 500 to a DFT of 400µm
- DFT checks, mount onto base frame, assemble coupling guard
Results:
The two product systems applied by skilled resolved the no abrasive blasting issue and currently provides durable protection against a high temperature corrosive aggressive environment.
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