In this lecture, I am teaching Process Design Engineering basic concept to one of my trainee students from Singapore. Here, Lecture starts with the concept of Design pressure, Design temperature,MAWP(Maximum Allowable Working pressure), piping specs break, equipment positive isolation using spectacle blind and valve arrangement like a single valve with a spectacle blind in lowpressure condition and DBB(double block and bleed) valve arrangement for high operating pressure equipments and piping isolation , HIPPS(High Integrity Pressure Protection system), wellhead platform topside equipment arrangements basics,how HIPPS system works,Blowdown and depressurization basics, why we do blowdown and depressuriztion, whats the diffrence between blowdown and depressurization, manual blowdown and auto blowdown etc. In the next part, I have covered Compressor settle out pressure and many more related to process design engineering.By subscribing my youtube channel you can learn complete process design engineering without any formal training.