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Contract: $243,849
Team Members Key Accomplishments:
Project Description:
This project was the largest of seven projects for this team and owner. Similar to World Resources project, the team was comprised of the owner, an engineering representative and the General Contractor. The projects were implemented sequentially and included other work at Building 055, 074 and 047. In all instances, Johnston Construction responsibilities included coordination with the owner during construction and start-up phases. We were also responsible for constructability review during the design portions. There were complicated instrumentation and chemical feed systems. Also, as the project progressed, the owner expressed a need for safety redundancy and fail safe measures. These were incorporated into the systems as we went along. Changes like these would have been very costly and time consuming had we been in a design-bid-build scenario. But, we were able to modify and adapt quickly and efficiently as a true design-build team. Some work was new installation at an existing manufacturing facility. Others were upgrades and modifications to existing systems. While the coordination was not as extreme as the other project, in all cases it was still very important. Safety was another key factor as many chemicals in use were extremely dangerous, including Hydro Flouric Acid (HF). The design-build team could factor safe construction methods into the discussion from start to finish. The startup and integration was done well always with the owner’s needs in mind. Two complete turn-key systems were installed at one location. The first is an ammonia packed tower fume scrubber. It includes a complete chemical feed system with pH control and monitoring, an independent 50 foot high discharge stack and a complete recycle loop with pump, pipe, valves, tank and level system. The second system is Scrubbing Hydrogen Fluoride Gas at 900 degrees Fahrenheit. This system includes a Venturi, cyclone separator and packed tower fume scrubber. The raw gas is transferred through Inconel ducting, then cooled in a carbon quench unit. A high powered stainless steel blower provides the necessary pressure drop across the first stage. An FRP fan continues the flow through the second stage. Two complete chemical systems and pH monitoring devices were used. Both systems are controlled at one custom control panel. The panel controls all functions and receives digital temperature, pressure and pH readouts as well as all system alarms. This project was all-inclusive from the excavation, concrete and structural steel to the finish paint, FRP enclosure and chemical storage totes needed for a fully functional system.
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