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(a)Base metal chemistry control.  The base metal chemistry and susceptibility to wet H2S damage is fixed because the repair is to existing equipment that has experienced damage.  However, this may be used as part of repair in accordance with NACE SP0472 where new material is being used as part of the repair.

(b)Preproduction weld procedure HAZ hardness controls and testing for the base material.  Implementing this method effectively for the base material requires the procedure to be qualified with materials closely matching those of the component being repaired.  This may not be feasible for a repair.

(c)Preproduction weld procedure base metal chemistry controls and reporting.
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