Investigating the failure reasons of 101-C exchanger tube in ammonia units

Project Details

Status: Completed

Registration Date 2008/11/04

Update Date 2008/11/04

Goals

Finding the failures reason and selecting a scientific method for optimizing the use of exchanger

Schedule

Commencement Date : 3/13/2002 Duration : 6Months

Executive Actions

1-Laboratory studies and collecting the damaged samples. 2-Investigating the process material such as, heat transmission and material distribution. 3-Investigating the metallurgic matters like, material type and the type of track and corrosion of present fluid. 4-Final totaling and suggestions for damage remedying and track preventing.

Basic Contractor

Material department – engineering faculty of shiraz university

Description

Contract Code: 80/097

101-C in ammonia unit are Bayonet type which produce more than 33% of high pressure steam of units (approximate pressure is 40 bar). This exchangers are in the way of secondary reformer outlet hot gases and their basic function in these units are process gas heat recovery. Steam drum circulating water with approximate temperature of 254 C is transferred to this exchangers tubes via Down Commer and after exchanging the heat with hot gases, it gets back from risers to steam drum on the basis of thermosifonic. During this operation, gas temperature decreases from 1000 C to 370 C.

In this exchangers critical processing conditions (high temperature – high pressure) and rational damageability of their mechanical structure against the unwanted processing conditions, it necessitates preventing the premature failure of tubes by recognizing destructive factors lead to complete stop of production abundant looses.