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• W2153351205 abstract "In the offshore industry, reliability of installed equipment is of paramount concerndue to safety, environmental and economic consequences. The costs of unplannedshutdowns and maintenance have high economic implications and are of increasingimportance with tighter profit margins. Reliability is therefore of significance whenselecting equipment model and brand.This report presents a survey of the field reliability of Alfa Laval plate heat exchangersin offshore oil and gas processes with main focus on failure data. Because of theincreasing attention paid to the relationship between optimised maintenance and theachievement of field reliability, preventive maintenance practices are also included inthe survey. Whether a product is reliable or not is in the end determined by the users.The users attitudes regarding Alfa Laval reliability are therefore surveyed as well.The method chosen was a cross-sectional survey focusing on quantitative primarydata. Data was collected by using self-administered questionnaires distributed by emailto maintenance personnel and process engineers at offshore oil productionplatforms. Valid responses were received for a total of 174 installations, including 309units at 60 platforms in nine countries.For 65% of the surveyed installations, respondents reported no failures, 25% onefailure and only 10% two or more failures. A total of 104 failures were reported. Theaverage failure rate based on reported failures was estimated to 6,14 failures/106 h. Asa comparison, 114 failures/106 h correspond to one failure a year. There is a risk thatall failures have not been reported and the estimated failure rate should therefore beseen as some kind of minimum value. It should be noticed that findings of previousand related research indicate that in offshore oil and gas processes the estimatedfailure rate of plate heat exchangers are lower than the failure rate including all heatexchanger types.Failure causes reported in the survey are generally the result of either none orincorrect maintenance, or unsuitable operating conditions which the survey have givenmany specific examples of. External leakage was the most commonly reported faultmode with 45% of the failures. This fault was generally due to gasket wear-out orgasket blow-out. Overall the most commonly reported corrective maintenance action was replacement of a few or all plates (including gaskets). Recurring failures appear tobe due to a lack of identifying the root cause of the problem, which can lie outside ofthe plate heat exchanger, leading to inappropriate corrective maintenance actions.The majority of all reported failures, 56%, did not have any negative influence on theproduction process at the platform, only 16% of the failures were reported to havecaused a process shutdown.Maintenance practices vary broadly between the oil and gas companies and platformsbut generally no or little preventive maintenance is carried out on the heat exchangerson a regular basis. Opening the unit for inspection, manual cleaning and thereplacement of parts are most often only carried out on units that currently have orrecently had failures.Overall, the end users’ attitudes and perceptions of the reliability of Alfa Laval and itsproducts and support are very positive reflecting the few reported failures. 88% of therespondents consider the Alfa Laval plate heat exchanger to be a reliable or veryreliable product." @default.
• W2153351205 created "2016-06-24" @default.
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• W2153351205 date "2003-01-01" @default.
• W2153351205 modified "2023-09-27" @default.
• W2153351205 title "Field reliability of plate heat exchangers in oil and gas processes - a market perspective" @default.
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