May 2016 www.chemengonline.com 05 Combustible Dust Standards Facts at Your Fingertips: Insulating HeatTransfer Piping Focus on Pipes, Tubes and Fittings Mixing: Innovative Designs and Agitator Seals page 42 Reliability and Maintenance Developments in Petroleum Refining Protecting Industrial Control Systems Monitoring Flame Hazards Mixing: innovative Designs anD agitator seals * reliability anD Maintenance vol. 123 no. 5 May 2016http://www.chemengonline.com