[MW:3625] After completion of hydrotest need to do vacuum box?

 Dear All,

 

I am working with API 650, Tenth edition year 2005 for Tank fabrication.

 

Now I want to know that after completion of  hydrotest  is there necessary to do vacuum box on the bottom plate?

If yes, please advice me with code reference. 

 

Thanks in advance,

 

Regards,

Moorthy. 

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