Mankato Energy Center (MEC) was originally designed as a 1×1 combined cycle to later add a second gas turbine and HRSG. Southern Power Company purchased the plant with plans to convert to 2×1. PAC worked with Southern Company Services- Technical and Project Solutions (SCS T&PS) to design, configure and commission Emerson Ovation DCS for the HRSG expansion. PAC assisted with development of domestic control narratives and the implementation of both domestic and vendor control narratives to DCS through logic and graphic development. PAC was a key contributor with all onsite control system commissioning activities with both Ovation DCS and the Asset Management System (AMS). PAC also assisted with loop optimization and tuning of HRSG systems such as feedwater pump speed controls, drum level controls, bypass pressure and attemperator, superheater and reheater attemperator, and numerous other systems. PAC manufactured and provided custom heated instrument enclosures that were able to withstand the low temperatures in central Minnesota. Project duration was approximately two years with commercial operation date of June 1, 2019.
The Southern Company Engineering Mankato Specification for SPC Mankato Energy Heated Instrument Enclosures called for 316 SS Enclosure able to withstand -50°F and maintain 70°F inside of the enclosure.
PAC designed a single and dual enclosure for this application. To confirm PAC could meet the specification we performed a test.
PAC inserted the enclosure in a cryogenic test chamber and used type T thermocouples in twelve (12) zones in the chamber.
Ten (10) thermocouples inside of the enclosure. All the thermocouples were connected to a Yokogawa digital recorder.
The Duration 45 minutes, Chamber temperature -199°F, Enclosure temperature 78°F
PAC provides loop tuning for the combine cycle feet for Southern Company Generation.
PAC provided engineering and programming services for a control system migration project. PAC helped program and design/reconfigure graphics for a migration from an Allen Bradley PLC control system to an ABB 800xA control system.
PAC Engineering worked with Southern Company Engineering and Construction Services (SCS-E&CS) to develop logic for both simulator and plant Ovation DCS. PAC was responsible for the logic development of the Start Up Burners, Direct Diesel Injection, and gasifier HP Steam System to Steam Turbine. PAC provided field checkout technician’s and calibration support for both DCS and SIS systems. PAC was responsible for SIS instrument calibrations, checkout and safety testing.
PAC was awarded the IC&E maintenance contract after SCS start up turned over to Mississippi Power. PAC currently provides test equipment calibrations and outage support.
PAC provided control wiring design for the interface of the Plant’s DCS to Zeeco’s duct burners system. Reviewed/modified existing DCS logic to be compliant with NFPA 85, Edit/build burner graphics, De-term existing control circuits for reuse on new burner system, Assisted plant with control wiring termination and labeling in new burner cabinets, hardware, and DCS remote I/O. Provide complete check out of burner system, commissioned Zeeco’s burner system, initial calibration of burner system instrumentation. Tuned new burner system for NOX and heat input, and tuned other BOP systems as necessary for integration of new burner system
PAC assisted with instrumentation and electrical support for Mitsubishi Hitachi Power Systems during major outages at Plant McDonough (Smyrna, GA) and Hobbs Generating Station (Hobbs, NM). During these outages, PAC was tasked with removing instrumentation and electrical components from the F-class and G-class Mitsubishi gas turbine housing and its surroundings, storing instruments and electrical components safely, and responsible for the reinstallation of instruments and electrical components after the gas turbine was constructed and turbine housing mounted back.
PAC was also the IC&E lead to assist with tying in two new pneumatic valves that were being mounted on new piping running to the F-class gas turbine in Hobbs, NM. The R&D project required two pneumatic valves be mounted along piping for the gas turbine. PAC lead the way with planning the conduit run, running the conduit, pulling the cable from the control building to the instrument, landing the cable at the control building and instrument, setting up the two pneumatic valves, and run a new air-line to the new valves.
PAC assisted with instrumentation and electrical support for Toshiba Power Systems during major outages at Plant McDonough (Smyrna, GA) and Entergy Nine mile 6 CCGT Plant (Westwego, LA). During these outages, PAC was tasked with removing instrumentation and electrical components from the Toshiba steam turbine housing and its surroundings, storing instruments and electrical components safely, and responsible for the reinstallation of instruments and electrical components after the steam turbine was constructed and turbine housing mounted back.
PAC provided annual PSM instrument calibration services during a major outage.
Provided checkout and start-up services on a new coater machine, chemi-washer, and aux boiler during a new control system migration. The existing ABB system was replaced with a new Emerson Delta-V control system.