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[MW:13932] Backing strip

By Materials & Welding
Hello friends
 
Need expert opinion on the subject as follows..
 
A Heat exchanger is being fabricated as per ASME Sec VIII Div.1.
The Channel Shell and dish end thickness is @ 10mm and dia. @ 600mm. The MOC is SA516 Gr.70.
Now for the closing joint seam i.e. Channel Shell # Dish end (single V joint) can a "Permanent Backing strip" with 8mm root gap be used ? The permanent backing strip will be 6mm thicknes X 25mm wide and stich fillet welded from inside. Contractor has submitted WPS mentioning permanent backing strip for this joint. Can we accept this ? Is there any provision in code for non-usage of permanent backing strips in pressure parts ?
The joint calls for full radiography. Contractor claims that upto 10mm thickness the RT will be cleared.
Can we accept this case as per ASME Sec.VIII Div.1.
 
Regards
 
Prem Nautiyal

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