Daishowa-Marubeni International (DMI) owns and operates the Peace River Pulp Division (PRPD) mill, located in Peace River, Alberta. PRPD produces premium hardwood (aspen) and softwood fully bleached kraft pulp in campaigns. Hot liquor from the Kamyr continuous cook digester passes through a 2-stage flash process, producing steam at a pressure usable elsewhere in the process. Increased softwood production rates have resulted in extensive corrosion of two of the existing carbon steel Flash Tanks. The tanks were replaced with one larger Duplex stainless tank.
Lowering the new 4.5-meter diameter, 9-meter-long tank into an existing building posed challenges regarding interference with existing building steel, and designing nozzle orientations that would not impede the installation and also would best tie into the existing piping while considering optimal fluid flow patterns.
The safety relief valve venting capacity review indicated a shortfall, thus the design included upgrades to the SRVs in order to conform to the latest ASME Section VIII requirements.
The design was performed utilizing 3D modelling in order to aid in the area layout and perform interference checks, as well as to automatically generate 2D drawings for use in development of fabrication drawings and installation. Temec recognizes that 3D modelling is a valuable means of communicating design aspects to our clients as well as an efficient design tool.