Accidental Risk Assessment on Atmospheric Distillation Column in Oil Refinery
Please cite this article as: Babaarslan N., Alpbaz M., Cabbar Y., 2014, Accidental risk assessment on atmospheric distillation column in oil refinery, Chemical Engineering Transactions, 36, 475-480 DOI: 10.3303/CET1436080 Accidental Risk Assessment on Atmospheric Distillation Column in Oil Refinery Neslihan Babaarslan, Mustafa Alpbaz, Yavuz Cabbar a Turkish Republic Ministry of Labor and Social Security, Inonu bulvari no:42, 06520 Ankara/Turkey b Ankara University, Chemical Engineering Dept., Engineering Faculty, Dogol st. 06100 Ankara/Turkey c Ankara Chamber of Industry (ASO), Ataturk bulvari no:193, 06680 Ankara/Turkey ncelik@csgb.gov.tr
Testing Strategies of Redundant Safety Instrumented Systems with Dangerous Detected Failures
Proof testings are regularly conducted on safety instrumented systems (SISs) to reveal dangerous undetected (DU) failures so as to reduce process risks. Sometimes, self-diagnostic tests of SISs can find dangerous detected (DD) failures which will be fixed as soon as possible. If such detections of failures also activate further tests for all components in the SIS in order to discover hidden failures, the original functional test strategy will be adjusted. Three following test strategies for redundant SISs including parallel structures are discussed in this paper given that a DD failure has been found, and then models for these strategies are proposed based on Petri nets.
One-pot synthesis of annulated pyrido[2,3-d:6,5-d]dipyrimidine derivatives using nitrogen based DBU catalyst in aqueous ethanol medium
Abstract We have reported DBU as an efficient organocatalyst for one-pot three-component synthesis of annulated pyrido[2,3- d :6,5- d ]dipyrimidine derivatives using aromatic aldehyde, thio-barbituric acid and 6-amino-uracil in aqueous ethanol under reflux. The attractive advantages of this process are mild reaction conditions, environment friendly procedure, short reaction times, easy isolation of products, and excellent yields (72–89%).