ISBS4A meaning in oil and gas
Definition
In Service Before Stage 4 Approval
ISBS4A means In Service Before Stage 4 Approval. Equipment that has been reactivated, energized, or put back in service before Stage 4 of a related MOC has been approved and completed.
Equipment that has been reactivated, energized, or put back in service before Stage 4 of a related MOC has been approved and completed.
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