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  1. Doiscond

    Urea Storage Tank Material

    I have been trying to determine what storage/transfer material options exist for 40% urea, kept at ambient/atmospheric conditions. There is a wealth of information online relating to materials needed for the high temperature/pressure production of urea, but I have not found much else for lesser...
  2. Doiscond

    Vessel Vacuum Rating with Cylinder/Head Flange

    I've got a ASME Div 1 pressure vessel that needs to be designed for relatively low pressures (+10 psig to -2 psig, @ 275 deg. F) and I have a question about a flange that separates the cylinder from the F&D Head. The image below shows the location, so they would be able to pull the whole top of...
  3. Doiscond

    AFT Arrow Model - Vacuum Relief Valve / Tank Vapor Strems

    Good afternoon all, Has anyone been able to model a vacuum relief valve in the software AFT Arrow? I have several tanks that will be connected to a vent header line and wanted to show a relief valve opening up if the vent header line vacuum level went below the relief valve set pressure. The...
  4. Doiscond

    Pipe Stress Expansion Joint vs Flex Hose

    Hello All, We are looking at a process line from the bottom of a pressure vessel to the suction side of a PD pump. Here's a snapshot of the stress model. 20" OD vessel, 6" piping, reduces down to 5" pump nozzle. You can see the vessel at the top anchored from it's support lugs, and the PD pump...
  5. Doiscond

    Steam Turbine Driven Pump Piping

    Hello All, I am looking at some steam turbine-driven pumps in a paper mill/recovery boiler feedwater application and have a few questions about the inlet and outlet piping. The original system from the 60s/70s had spring cans on both sides and a whole host of supports that had been...
  6. Doiscond

    Steam PRV Discharge Piping Layout

    I've got a sketch attached showing the layout and dimensions, it's a steam PRV with the discharge piping routing down to the ground level instead of exhausting upward. I'm not used to seeing a relief line routed like this so I just wanted to make sure I wasn't missing something. Are there any...
  7. Doiscond

    Truck Unload Vapor to Thermal Oxidizer

    I have a case where a truck is loaded with a liquid product, and the vapor displaced during the fill is routed to a thermal oxidizer. A bunch of tank and truck unload station vapor lines tie into a header leading to the thermal oxidizer. There is a discussion about whether a blower is needed in...

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