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[MW:5628] RE: 5627] Equipment Design Life

By Materials & Welding
The stipulated design life relates mainly to two issues:
  • Cyclic loading of the equipment (fatique)
  • Corrosion of the equipment
Therefore you may have the possibility to consider the risk of fatique, if you have information or can estimate cyclic loadings (peaks, frequency of the peaks) - this may give you a fatique life span.
 
The other issue is the corrosion rate. Depending on the corrosion characteristics (your medias and the selected materials), it may be possible to determine a corrosion rate (mm / year). Comparing this with your calculated thickness of for example a vessel shell, taking the selected corrosion allowance into consideration - will also give you a design life time of the actual equipment.
 
This is the metods to assess the two stated issues.
 
regards
Kristian

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Phirke, Praphulla D (GE Oil & Gas)
Sent: 17. juni 2010 06:28
To: materials-welding@googlegroups.com
Subject: [MW:5627] Equipment Design Life

Dear Team members
Can anyone guide me how to calculate the equipment design life?
In one of the project , Customer has mentioned in the specifications about the design life as per attached file.
 
Please guide me how to design a equipment according to this requirements.
 
Thanks
Praphulla
 

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