T14: Dry Gas Seal Contamination And Solutions To Increase Seal Reliability
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Date
2021
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Turbomachinery Laboratory, Texas A&M Engineering Experiment Station
Abstract
Recent incident reports and studies indicate that dry gas seals are responsible for only 39% of compressor shut downs and are themost reliable sealing solution However, if the dry gas seal fails the costs can be very high and the availability of the whole plantmight be constrained The major causes of dry gas seal failure can be clustered in four different incidents from which three are relatedto contaminationï‚· Process gas contaminationï‚· Seal gas supply contaminationï‚· Bearing/Lube oil contaminationThe seal gas line of the dry gas seal supply system is designed and manufactured to supply clean and dry gas to the dry gas sealNevertheless, the originally designed filters and treatment components of the supply system may no longer fit to the current operatingconditions of the machine anymore as gas composition, temperature or pressure requirements are changing over time As well duringupset or transient operating conditions, the functionality of the supply system might be limited Upgrading the supply system to cope with the current process requirements is often a difficult venture, which requires the involvement of various parties Enabling the sealinstead to cope with difficult environments can be a first solution to ensure the availability of the plantThis paper will contain information on the following topics:ï‚· Different types of contaminationï‚· Dry gas seal failure mode due to contaminationï‚· Solutions to increase seal reliabilityïƒ How to tackle process gas contaminationïƒ Design features to handle seal gas supply contaminationïƒ Avoid/handle bearing/lube oil contamination
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