As with most projects that we do this one has several challenges
- No access to bring materials to roof
- Strict time frame when unit could be down
- Having to put the unit back in service. Imagine replacing the major components of the unit, piece by piece but you can only turn off the unit Friday evening and it must be back on Saturday evening by 6pm!
For the crew that completed this refurbishment, they don’t have to imagine it, they
DID IT!
They replaced the chilled water coils, duct connections, mixing box, blending boxes, outside air duct heater, drain pans, humidifier, new supply air fans, a final filter rack, new supply plenum, and VFDs. All within this short time span for Friday night through Saturday nights.
Due to the unit service spaces that handle sleep studies the unit had to be back on in time for long previously scheduled sleep studies.
This led to (5) weekends of work:
1st Saturday – Completely stage job before starting by putting all material needed for job onto roof via a rig because no way to get material to penthouse through the building. This required coordination with our Safety Team to add a roof safety railing system.
Next up was the work:
1st weekend of 3 weekend shutdowns had us replacing the OA duct and RA duct and added RA Blender and OA duct heater. This involved a lot of coordination and work by Custom Sheet Metal and Siemens.
2nd weekend of 3 weekend – the crews replaced (2) CHW coils, which were of a different foot print requiring additional welding, as in (20) welds instead of (4). Also replaced existing drain pan with (2) new ss drain pans.
3rd weekend of 3 shutdowns – removed existing humidifier and added a fan wall with (4) new sa fans, a final filter rack and built a new supply plenum and added (4) new VFDs and cleaned the existing supply duct going through the floor that was full of trash and dirt. Unit back up and running by 6pm.
Final Saturday was to remove all equipment from roof and demobilize.
Ultimately the client got a new 35,000 cfm old that replaced their 19,000cfm and the patients were not impacted!
Russell Ryan, “We would not have accomplished this job without the crew that we had. Each person there was f&$#’n essential.” I’ll add that personnel from all field and service teams came together for this project.
