TWI Workshop for Assessment of Metal Loss:

Metal loss (thinning) is the most widely cause of failure in oil, gas, chemical/petrochemical and power industries. Several procedures have been developed to deal with deterioration associated with thinning on pressure equipment. A short background to the Fitness for Service (FFS) assessment procedure for metal loss from different documents is discussed in this workshop with the main focus on API 579-1/ASME FFS-1 Part 4- General Metal Loss and Part 5- Local Metal loss. The distinction between general and local metal loss is discussed and the concept of Remaining Strength Factor (RSF) is introduced. Work examples are provided for candidates to perform hand calculation and appreciate the background of the assessment. TWI FFS software, Integriwise, is provided to carry out the assessment on the same work examples. 5 real case examples are also given at the end of the workshop as the team exercise to be analysed using Integriwise and discussed in the group.

 

 


 

TWI Workshop for Assessment of crack like flaws:

A fracture assessment is carried out for a planar flaws (crack-like flaws) and based on a fracture mechanics approach. Crack like flaws are predominantly sharp at the root radius and are typically planar. Some examples of crack like flaws are lack of fusion and lack of penetration in welds and sharp grooves. It is conservative and sometimes advisable to treat porosity, undercuts and inclusions as crack like flaws. The susceptibility of critical equipment to brittle fracture can also be assessed using the principles of fracture mechanics. All fracture mechanics assessment procedures are based on the failure assessment diagram (FAD) approach. BS 7910 is one of the main standards used in Energy Sector for assessment of crack like flaws for over two decades. It is assumed that candidates attending this workshop have already attended the short course on fracture mechanics. Application of FAD

Work examples are provided together with TWI fracture assessment software, Crackwise, tp perform analsysis o provided to carry out the assessment on the same work examples. 5 real case examples are also given at the end of the workshop as the team exercise to be analysed using Integriwise and discussed in the group.

 

 

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Amirkabir University of Technology

department of aerospace Engineering
No.424, Hafez Ave, Tehran, Iran
Telefax: +98-21-64543220
Email: ipec1395@gmail.com.

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