Although the concerned substrate is
made out of a special corrosion resistant high-grade steel
type, a gas washer located in a refinery showed considerable
corrosion damages in several areas due to severe chemical
and thermal exposures.
and reboiler of an amine gas treating plant for
the natural gas purification
corrosion damages; in places corrosion up to 4
mm (here reduction of the original
wall thickness of about 50%)
steel SS 316L
(MDEA Methyl diethanolamine), degraded amines,
hydrogen sulphide H2S, carbon dioxide CO2, heat
stable salts, formic
acid CH2O2, oxalic acid C2H2O4, acetic acid C2H4O2,
sulphuric acid H2SO4, dioxygen O2, acetate
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The aim of the gas
washer is to process the streaming sour natural gas by means of supply of MDEA
in certain concentrations
of sulphur hydrogen and carbon dioxide for the further
transportation according to the pipeline standards (keyword "sweetening").
Corrosion caused by the combination of high working temperatures,
pressure and the reaction
of different agents and chemicals is not unusual at such
constructions. Due to the long-term demands at various
areas of the plant within scheduled inspections a high
intensity of the corrosion damages was detected and finally
it was necessary to initiate a repair procedure.
repair by current welding methods is problematic
due to the error rate at the demanding performing welding
works and the necessary accompanying heat treatment
after the welding (keyword stress crack, intergranulare
corrosion, PWHT post weld heat treatment). Besides
the damaged areas are rather huge (see also standard NACE RP0472-2000 & API Recommended
Practice 582, Welding Guidelines for the Chemical,
Oil and gas Industries).
the first time trial coatings of approx. 40 kg Ceramium
CH and Hardener CH1 were carried out in some damaged
areas of the plant in an average layer strength of 3
visual inspection of the coated areas approx. half
a year later was positive and it was decided to order
bigger quantities of Ceramium CH / Hardener CH1 for
coating of other damaged areas of the plant.
detection of the defects; decision for a first
use of coating material made
coatings with Ceramium CH
survey of trial coatings; good result
about additional bigger quantities of Ceramium
CH / Hardener CH1 for the coating of further damaged
of the coated surfaces is still rated as good
of MultiMetall has succeeded in developing with Ceramium
CH a PolymerCeramic which possesses a very high chemical
permanence. Only with the suitable know-how the production
of such a material is possible.
is just one example of the many different applications
where PolymerMetall® is used.
plants and components operating smoothly, metals
must live longer.