You're at site for absorber recommissioning with only a P&ID available, no datasheets. During the walkdown, you search "absorber pre commissioning checklist without instrument datasheets". Before introducing solvent circulation, what sequence gives the highest confidence that mass transfer performance won’t be masked by basic mechanical faults?

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Option A front-loads the checks that can’t be inferred later. Internals orientation and distributor level directly govern wetting and maldistribution, and a dry dP test catches obstructions without risking solvent contamination. Option B sounds disciplined but hydrotesting and filling tell you nothing about distributor skew or rotated packing. Option C assumes thermal profiles will reveal maldistribution, but that only shows up once mass transfer is already compromised. Option D treats instrumentation as the gate, yet clean signals don’t compensate for misinstalled internals.

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