Continued from The MP Blog, p. 13. The following items relate to coatings & linings.
Please be advised that the items are
not peer-reviewed, and opinions and suggestions are entirely those of the in- quirers and respondents. NACE Interna- tional does not guarantee the accuracy of the technical solutions discussed. MP welcomes additional responses to these items. They may be edited for clarity.
Coating system for silos
that handle pastillated sulfur do not have an internal or external coating.
Q
Prior to commission- ing a new gas sweeten- ing plant, we noted that the concrete silos
I am concerned that sulfur traveling
from the pastillation unit will react with atmospheric moisture to form sulfuric acid (H2
SO4 ) that will gradually penetrate
into the concrete wall. This penetration could thereby disintegrate the reinforce- ment bars and the concrete silo itself. Can anyone recommend how to protect against this situation?
A
You might check with your sup- plier and ask for mortars or rein- forced plastics such as polyester, ^QVaT M[\MZ WZ ÆISM OTI[[ 1 IU
sure they will help you with a suitable product recommendation. What you will need is a 100% solids primer as well as an abrasion-resistant, 100% solids epoxy lining to be able to take the physical abuse inside the silo. The epoxy lining has to be chemically resistant enough to withstand the H2
SO4 created by the humidity. A
topcoat made with the same 100% solids resin, also abrasion-resistant, creates a
Polysiloxane coatings at high temperatures
mance of polysiloxane paints at temperatures ~500 °C?
group of polysiloxane hybrid coatings is organic by design, and temperature- limited by thermal decomposition. Al- though some organic resins (epoxy,
Q A
You may have an inaccurate impression that polysiloxane coatings are designed for high- temperature service. The entire
Does anybody have ex- perience (good or bad) with the application and/or service perfor-
smooth surface. This will make it easier for the pellets to move with minimum friction.
48 MATERIALS PERFORMANCE November 2012
NACE International, Vol. 51, No. 11