Greenville Utilities Commission (GUC) is seeking sealed bids for the furnishing of one (1) NX500D (500 HP) high-speed, dual-core turbo blower system with dual layer bump foil air bearing technology. The complete packaged blower system shall include a sound enclosure, motors, variable frequency drives (VFD), control panels, programmable logic controllers (PLC), inlet air filter/silencers, blow-off valves, check valves, discharge valves, and flexible connectors. The equipment must be factory-assembled and complete with all necessary appurtenances for a fully operational blower system.
The blower must be CSA/UL/CE Listed and designed specifically for wastewater treatment applications. Key specifications include a design discharge pressure of 10.00 PSIG, system design maximum flow of 11,000 SCFM at maximum inlet air temperature (95°F) and 80% relative humidity, and maximum power consumption of 406 kW at design capacity. The equipment shall feature a Permanent Magnet Synchronous Motor (PMSM) operating on 480V, 3-phase, 60 Hz power with integral variable frequency drive and a minimum 75% turndown capability. The blower must utilize double-layer bump foil air bearings manufactured from Inconel alloy and Teflon-coated, requiring no lubrication for operation.
The control system shall include an Allen Bradley CompactLogix L33 PLC with a PanelView Plus 7 performance 10-inch HMI touchscreen. The blower must be capable of operating in multiple control modes including Constant Speed, Flow Control, Dissolved Oxygen (DO), and Pressure Control, with remote monitoring and control capabilities via Ethernet/IP communication. The Master Control Panel shall be capable of managing a minimum of two dual-core units. The system must include built-in provisions for remote access via VPN or cellular communication for manufacturer monitoring and troubleshooting.
Factory acceptance tests must be performed in accordance with ASME PTC-10 Type 2 specifications at four design points, with acceptable tolerances of 4% on flow, 2% on pressure, and 1% on power. The manufacturer must demonstrate 15+ years of continuous successful in-service performance in North America for similar municipal wastewater treatment applications, with at least 60 similar blowers permanently installed and operational in wastewater treatment facilities, including a minimum of five installed units in North Carolina facilities. A one-year warranty from substantial completion is required, including bi-annual maintenance visits and a maintenance service contract. Key submission deadline: October 2, 2025 at 2:00 PM EST.