Cold boxes, or more precisely, the brazed aluminum heat exchangers (BAHX) that comprise them operate unseen and do not lend themselves to the inspection methods typical of most other critical process equipment. Furthermore, BAHXs are not immune to process upset conditions which over time can threaten the structural integrity of these vital components in the form of thermal fatigue cracking. The challenge to the chemical processing industry is therefore one of attempting to establish the condition of ageing cold boxes especially with regard to quantifying the cumulative damage resulting from multiple normal and emergency upset events.
NOVA Chemicals is one of a growing number of companies that are using finite element methods to closely analyze the long-term response of BAHXs to such transient conditions and to interpret the results in the broader context of fitness-for-service and remaining life. The same methodology is also being employed to look at newer BAHX designs in order to assess their vulnerability to future thermal fatigue damage.
This paper describes a recent case history undertaken at NOVA Chemicals in which a number of older BAHXs were analyzed using finite element modeling (FEM).
Would you like to access this content?
No problem. You just have to complete the following steps.
You have completed 0 of 2 steps.
You must be logged in to view this content. Log in now.
Purchase Technical Presentation
You must purchase this technical presentation using one of the options below.
If you already purchased this content recently, please click here to refresh the system's record of ownerships.
|Credits||0.5 Use credits|
|List Price||$25.00 Buy now|
|AIChE Members||$15.00 Buy now|
|AIChE Undergraduate Student Members||Free Free access|
|AIChE Graduate Student Members||Free Free access|