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Model 881-NSL Sulfur Pit AnalyzerH2S is entrained in liquid sulfur as it runs into the sulfur pit. Polysulfide compounds in the liquid sulfur break down with time to release H2S. H2S from these sources collects in the vapor space above the sulfur where it could exceed both toxic limits and the lower explosive limit. To prevent a dangerous H2 S concentration from accumulating, most pits are air purged to keep H2S levels low. Compressed air is expensive, and most plants run with an excessively low H2S level to be on the safe side. In addition to the H2S hazards, the liquid sulfur itself can catch fire thereby spewing high concentrations of SO2 gas into the vapor space above the liquid sulfur. For safety purposes, it is necessary to monitor the vapor space above the liquid sulfur for H2S and SO2 gases. more ... |
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Model 930 H2S in Sulfur Pit AnalyzerIn many sulfur recovery units, produced sulfur is stored in liquid form in sulfur pits. Operators are increasingly aware that sulfur pits present potential danger to plant personnel and overall plant safety. It is therefore critically important to monitor H2S in the vapour space of sulfur pits to ensure that it remains below the Lower Explosive Limit (LEL) (4.3% by volume). Additionally, the presence of rising concentrations of SO2 in the sulfur pit vapour space provides an early indication of smoldering fires. Therefore, on-line, continuous monitoring of SO2 can enable detection of such fires before they get out of control. more ... |
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