Customer

AEP

Location

West Virginia

Highlights

  • Bolt Pattern Conflict Identified During Foundation Work
  • Field-Driven Proposal Avoided Costly Redesign
  • Kept Substation Project on Schedule Despite Tight Outage Constraints

Field-Driven Bolt Pattern Fix Saves Time in Substation Construction

The Challenge

During the construction oversight of a critical substation project, a discrepancy was discovered between the foundation bolt pattern (12” spacing) and the steel structure provided (14” spacing) for the circuit switcher. The mismatch, if not addressed immediately, would delay installation, violate design intent, and risk pushing the outage schedule, already tight due to the need to keep customers on radial feeds. 

Root Cause Analysis 

  • Design Misalignment: The field prints specified a 12” bolt pattern, but the steel fabricated for the structure had a 14” spacing. 
  • Material Procurement Variance: Engineering substituted a different steel structure but didn’t update foundation specs accordingly. 
  • Outage Risk: Delays would jeopardize the outage window, requiring complex customer rerouting or rescheduling. 

The Solution

Field-Initiated Revision

Rather than proceed with engineering’s initial fix, stacking angle steel under the structure, the onsite Think Power Solutions construction lead proposed a cleaner solution: punch new holes directly into the bottom flange of the existing steel. 

Engineering Approval

The proposed fix maintained structural integrity while eliminating the need for additional materials. Engineers reviewed and approved the field modification. 

Schedule Integrity Maintained

This approach allowed work to proceed without interrupting the tight outage plan, preserving downstream timelines. 

Key Benefits

  • Faster Resolution: Prevented delays that would have affected the full substation schedule. 
  • Cost Efficiency: Avoided new steel purchases or redundant foundation work. 
  • Outage Window Protected: Maintained customer service continuity. 
  • Field-Engineering Alignment: Showcased the value of experienced oversight teams proposing technically sound alternatives. 

The Results

The alternative fix was implemented without issue. The substation remained on schedule, and the critical switchgear was safely installed. Think Power Solutions’ field oversight ensured both structural compliance and project continuity despite initial material mismatches. 

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