Service Pier Analysis and Repair
Naval Base Kitsap
Bangor, WA

Wood Harbinger’s recommendation saved the government about $1.5 million in repairs and delays.

Wood Harbinger’s solution corrected the problem without any major alterations to the infrastructure serving the shore power systems.

This project included a new electrical shore-power system to serve SSN’s. The shore-power system was designed to provide two 1,600 Ampere connection points at two shore-to-ship locations. Each shore power connection was served by four separate 400 Ampere circuits. Each circuit was limited to 400 Amperes by a dedicated circuit breaker. For the 1,600 Amperes load to be served, all four of the 400 Ampere circuit breakers needed to be closed at the same time. When one of the four breakers tripped, the other three breakers immediately overloaded and tripped as well. When this cascade of tripping occurred, shore power was interrupted.

At the conclusion of the Service Pier construction, the Shore Power Delivery system was performance tested and the results found that a 1,600 Ampere load could not be served without the cascade tripping occurring. The Government performed additional testing and acquired an estimate for repairs. The repair recommendations from the special testing and repairs were estimated at $2 million. After receipt of this estimate for repair, the Government sought a second opinion and contracted us to review the reports and repair estimates. Wood Harbinger evaluated these reports and found the concerns of the Government to be valid.

The Government asked us to retest the Shore Power System, determine the cause for the unacceptable performance, and present a recommendation for corrective action. A detailed scope of work was developed and implemented. Physical testing was performed for each 400 Ampere circuit group and the loading of the circuits serving the shore power connection points. This new testing provided clear evidence that the concerns of the Government regarding the earlier test results and recommendations were justified. Wood Harbinger’s data indicated that the earlier repair estimate of $2 million could be significantly reduced.

The results of the testing provided clarity of the cause for the unacceptable performance, and from this information we provided a recommendation for repair that was completed for approximately $400,000; saving the Government approximately $1.5 million in repairs and delays. One key Government engineer, Mr. Kilfoyle, P.E., (Electrical Engineer – NAVFAC Public Works) called the Wood Harbinger’s solution “ingenious” since it solved the problem without any major alterations to the infrastructure serving the shore power systems and complied with the Navy expectations for reliable shore power.