a Metallurgical Engineering & Inspection Services for the hydrogen and syngas industries


 

Assessment

 

Tube, Pigtail and Sub- header Condition Assessment

 

Each nondestructive examination technique has inherent advantages and disadvantages. The use of any one technique as a stand-alone tool results in frequent false calls and inaccurate results.

HSI, over a fifteen year period, has developed the unique 'H'SCAN® approach to tube inspection. This approach utilizes a multi-parameter technology that includes both internal and external inspection tools which utilize:

 

• Proprietary Ultrasonic Inspection

• Proprietary Eddy Current Examination

• Strain Measurement (OD/ID)

• Tube Wall Thickness Measurement

 

The inspections are carried out in a single, simultaneous scan, with custom-designed hardware and software.

     
 
 
Tube Remaining Life Assessment
APPLICABILITY OF NDE TECHNIQUES
TO DEFINE DAMAGE (Inspection Performance)
 
HSI and DNV have jointly developed WinTUBE™ - a custom software program for the remaining life prediction of reformer tubes. The program predicts local material damage related to:
  The chart below demonstrates the ability of various NDE techniques to detect and quantify the various damage manifestations. The premise is to provide definitive information on tube condition and data input for remaining life calculations.
       

• Internal Pressure

• Thermal Stress Gradient

• Operating Temperature

• Cyclic Operation

• Creep Stresses

 
   
It is unique in that it contains material properties (creep deformation and creep damage relations) for HK 40, HP 50, HP Modified, and HP Micro Alloy. The program computes stresses caused by pressure, thermal and axial loading using the elastic-creep finite element analysis (FEA).
To correctly predict remaining tube life, it is important to accurately assess the current condition of the tubes. This problem has been solved by HSI through the development of the 'H'SCAN® approach.