Mechanical and Electrical

REPLACE TRANSFORMER – US COAST GUARD TRAINING CENTER

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  • Client: US Coast Guard
  • Location: Petaluma, CA
  • Date: 2016
  • Contract #: HSCG88-16-J-PFPR01
  • Value: $60,529

Project Details

Cerrudo Services removed a 225 kVA, three phase transformer and replaced with a new 225 KVA three phase transformer. The line side conductors were reused.  Secondary conductors from transformer to transfer switch were resized along with conductors from the transfer switch to the breaker.  Additional neutral conductors were provided from the transformer to the transfer switch for future generator back feed connection.  The 800A breaker line and load side conductors were reconnected.  Temporary generator connections were disconnected upon successful replacement of the transformer.

HEATING SYSTEM UPGRADE – US COAST GUARD STATION BODEGA BAY

  • Client: US Coast Guard
  • Location: Bodega Bay, CA
  • Date: 2015
  • Contract #: HSCG88-14-J-PQQ166
  • Value: $437,000

Project Details

Cerrudo Services provided repair, replacement and protection of electrical and water utilities from the shore to the existing floating dock and the replacement of an existing boiler and the addition of heating and ventilation to all occupied spaces at Coast Guard Station Bodega Bay.  A new heat exchanger was installed to provide fresh air above the new boiler in the mechanical room.  Fourteen hydronic radiators were installed throughout the building.  The water heater was replaced.

Conflicts existed between the plans and specifications.  One major conflict involved the new boiler and pump.  The required design operating performance characteristics provided in the equipment schedule on the plans were at odds with the specification requirements for a pump construction.  The specifications required pump construction characteristics found in larger capacity pumps that are not available in the designed-required pump capacity and horsepower.  It was resolved that the operating characteristics provided in the equipment schedule would be utilized as the defining equipment selection and installation criteria.

During construction it was discovered that the existing sewer piping and floor drains in the mechanical room required replacement.  The existing floor slab was demolished and the sewer piping, cracked vent line, sewer cleanout, floor drain, P-trap and associated piping were replaced.  After backfilling, the concrete slab was replaced.

REPLACE TRANSFORMER – US COAST GUARD AIR STATION SAN FRANCISCO

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  • sfo-transformer-1
  • Client: US Coast Guard
  • Location: San Francisco International Airport
  • Date: 2016
  • Contract #: HSCG88-16-J-PQQ092
  • Value: $95,331

Project Details

The existing 250 kVA pad mounted transformer was removed and replaced with a new 250 kVA transformer.  The new transformer arrived on site on a flatbed truck through the helicopter gate, parked on the side of the tarmac where it would not interfere with Coast Guard operations.  A section of trellised privacy fence adjacent to the transformer pad was temporarily removed.  The circuit to the existing transformer was de-energized and secondary breaker wires and panel removed.  A forklift lifted the existing transformer from the pad and set the transformer on the flatbed truck.  The new transformer was lifted from the truck and transported to and placed on the pad.  Secondary breaker and wire were installed and the primary 15 Kv wire re-connected.  The circuit was re-energized and the transformer tested.  As part of the work, the underground secondary electrical feeder from the transformer to the main switchboard was removed and replaced.

US COAST GUARD TRAINING CENTER – DESIGN BUILD REPLACEMENT OF BASE WIDE FIRE ALARM

  • Client: US Coast Guard
  • Location: Petaluma, CA
  • Date: 2014
  • Contract #: HSCG88-13-J-PFP000
  • Value: $2,941,442

Project Details

Cerrudo Services is providing the design and installation to replace the Base Wide Fire Alarm at the US Coast Guard Training Center.  The current fire alarm system is unreliable and requires replacement because of its age.  The work encompasses 38 buildings and includes 23 new fire alarm control panels with new radio communications interface, 15 new radio communications interface with existing panels, new smoke and heat detectors, duct detectors, unit flow switches, pull stations, horns and strobes and addressable relay monitor modules.  A central station supervisor system is being installed at new Police Building 230.

The new design required investigating all the spaces in the different buildings to verify that the existing fire alarm installation matched the existing as-built drawings.  Existing drawings with detailed site investigation data were compiled to provide a comprehensive and accurate new fire alarm design.  The design of the new system included fire alarm panels, all input and output devices, device wiring, radio interface, floor plans showing locations of fire alarm devices, panels and radio systems.