Cleaning and decontamination technologies.
The planned shutdown is a very labour-intensive time, which requires a perfect scheduling and organisation. Health hazards are possible, when tanks, vessels or distillation columns are only steamed or flushed with nitrogen. Toxic hydrogen sulfide, volatile hydrocarbons or carcinogenic benzene can be released. Due to the pyrophoric nature of iron sulfide it can become a serious problem, because it oxidizes exothermally when in contact with air. Most pyrophoric iron fires occur during shutdowns, when vessels, columns and heat exchangers are opened for maintenance and inspection.
During plant shutdowns keeping timing schedules is extremely important for the planned cleaning and maintenance. Besides the effective cleaning of metal surfaces occupational safety is a key priority. The adherence of the lower explosion limit (LEL) as well as the removal of benzene, pyrophoric iron sulfide, hydrogen sulfide and other hazardous gases is absolutely necessary.
Kurita provides suitable cleaning and degassing additives in order to reliably achieve these targets. A mechanical cleaning of storage tanks may require several weeks of downtime, while the chemical cleaning and decontamination will reduce it significantly to a few days providing a great economic advantage. The decontamination time of distillation columns can be reduced to 8 – 12 hours in one single cleaning step. Time-consuming steam stripping with high waste water contamination is no longer necessary. The environment is protected by the use of biodegradable ingredients. Simultaneously, the handling of our cleaning and decontamination additives is easy and safe for the operating personnel.
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