Minimum Thickness - ASME VS. PIP

Valid ASME Code designs rejected by Owner/Operators? It happens all the time when facilities enforce their own specifications, such as Process Industry Practices (PIP) specifications, on top of ASME Code rules. 

Let’s take a look at a low consequence vessel designed with a ⅛” port cylinder thickness. Yes, the ASME Code allows for thicknesses as low as 1/16” per UG-16.2(d). However, the PIP Specification requires 3/16” minimum corroded thickness for all heads and shells. This means that facilities governed by the PIP Specifications need to adhere to the 3/16” minimum thickness and NOT the 1/16” thickness per ASME Code. 

I love helping Owner/Operators enforce their own specifications because well defined specifications can help ensure facilities run safely and efficiently. Not sure where to start? Metalmark Engineering specializes in creating and maintaining the specifications for facilities just like yours!