- Cold Reheat Vent Stack Modification
We provided detailed design engineering for the modification of the existing vent stack piping on Unit 1 through Unit 4 cold reheat safety valves at the Labadie Power Plant. Each unit is a 600-megawatt (MW) coal-fired unit. The modifications prevent the discharged steam from damaging the building facade and minimize vibration during times of safety valve lift off.
We executed the project in phases, modifying each unit during its major outage year. The primary modification for each unit was to redesign the cold reheat safety valve vent stacks so that they no longer impinged on the building siding during a lifting event. The vent stack discharge modifications altered the lift of reaction forces which required additional design efforts to counter-balances these forces. For each unit, pipe stress analysis was performed and new snubber-type supports were specified. Each unit has six cold reheat safety relief valve vent stacks and the design resulted in four new snubbers per vent stack. In addition to the mechanical changes, we also engineered platform modifications/extensions for better access to the safety valves and included plant air access, lighting and receptacles near the safety valves.
Our team completed the design using 3D modeling. The model included both existing and new components and structural steel. We developed specifications and drawings for the construction bid documents, helped bid, evaluate and award the construction contract, provided contract administration services, construction observation services and commissioning support services.
- Project management
- Existing conditions walk down
- Specification development
- Procurement support (material purchased on owner paper)
- Construction support (construction procured on owner paper)
- Commissioning support (coordinating OEM field services)