According to API TR 980 – Monolithic Refractories: Installation and Dryout, when multiple heat sources are used during refractory dryout, the final approval must come from the Owner:
“If more than one heat source is used, the contractor shall obtain written approval from the Owner for the dryout procedure.”
— API TR 980, Section 6.2.2
While the contractor may propose or execute the dryout, the responsibility for ensuring its validity and safety—especially when multiple heat sources are involved—rests with the Owner.
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