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Seaward Returns to Arthur Kill Power Station for 2021 Underwater Cleaning, Inspection, and Repairs

Posted June 1, 2021
Written by Cecil C. Achord
Seaward Marine Services mobilized a seven-person dive team and support equipment from Norfolk, VA on January 31, 2021 to provide diving services at Arthur Kill Power Station in Staten Island, NY in support of underwater cleaning, inspection, and repair items identified in the intake bays and discharge tunnel from previous 2017 and 2020 underwater inspections. Period of performance was February 3-28, 2021. Seaward Mobile Diving Unit 2 received the task.
 

Arthur Kill Power Station, Staten Island NY

After a standby day on February 1 due to a local heavy snow storm, work commenced February 2 with equipment setup and lock out/tag out of Unit 30. Unit 20 remained operational during diving operations in Unit 30. Underwater cleaning and de-mucking of Unit 30 circulating bays 31 and 32 and traveling screen bays 31, 32, 33, and 34 was accomplished February 3-8, 2021. All mud, silt, trash, and marine growth was pumped from the intake structure floor to a settling tank where solids were separated from the de-mucking discharge stream for offsite disposal. Clean sea water from the discharge stream was returned to the Arthur Kill Waterway.

February 9, 2021 was a setup day for work in the discharge tunnel. Lock out/tag out was accomplished on Unit 20 to allow satisfactory conditions for diving operations in the discharge tunnel. Diving on the discharge side commenced on February 10, 2021. The outage timeline only allotted 10 days of diving operations to accomplish a large scope of work in the discharge tunnel. Seaward responded by mobilizing a second seven-person dive team, Seaward Mobile Diving Unit 4, to accelerate completion of the project scope by working two twelve-hour shifts. Discharge tunnel walls and floor were cleaned and de-mucked. All debris and rubble identified in previous inspection reports were removed and placed in a dumpster for offsite disposal. Repair areas were surveyed and marked for identification. Concrete repairs inside the tunnel were scheduled for October 2021.

Diving operations were secured in the discharge tunnel on Friday February 19, 2021. Seaward dive team removed equipment from the discharge tunnel and relocated to Unit 20 February 20-21. Lock out/tag out of Unit 20 was completed on February 22 and cleaning of Unit commenced in the afternoon. Underwater cleaning and de-mucking of Unit 20 circulating bays 21 and 22 and traveling screen bays 21, 22, 23, and 24 was accomplished February 22-27, 2021. All mud, silt, trash, and marine growth was pumped from the intake structure floor to a settling tank where solids were separated from the de-mucking discharge stream for offsite disposal. Treated sea water from the discharge stream was returned to the Arthur Kill Waterway.
 
Seaward Marine Services Mobile 2
SCAMP Machine Deployed for Tunnel Cleaning

Diving operations secured at close of business February 27, 2021. Lock out/Tag out was cleared and equipment was packed up for transit February 28, 2021. Demobilization to Norfolk was March 1, 2021. Seaward Marine Services logged 1,564 hours of accident-free diving through the duration of the evolution. Support from the AKPS Maintenance Manager and Staff was outstanding.
 
Seaward Around the Clock Dive Ops
Diver Dress and Pre Dive Checks

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