Include specific verifications, such as verification sign-offs (signature field), when work instructions, or those incorporating Engineering Change Notices (ECNs), contain direction applicable to more than one component. Removal of one of four check valves was not completed, causing a condition that blocked flow, and resulted in a leak. Having verification sign-offs for each check valve removal would have ensured proper work execution and equipment integrity. While this event resulted in no safety consequence, damage to equipment and use of additional resources were required to accommodate the leaking condition.
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