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  • Users: Lijantropo
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  1. Lijantropo

    Free Vent + Gas reaction

    Dear all colleagues, I am evaluating the required size of a free vent to be installed in a new atmospheric tank. Normally I would follow the API STD 2000 to determine inbreathing/out breathing (including thermal in/out breathing) requirements, and then proceed with a hydraulic calculation to...
  2. Lijantropo

    Partially Filled Pipe Under pressure

    Hello Dear Colleagues, I'm wondering if it's possible to have a partially-filled pipe but under pressure (no gravity flow). I was thinking of a pair of tanks and a pump. The second tank is higher than the first one, and it operates at 50 psi. The pump have to overcome the static height and...
  3. Lijantropo

    Genereaux Equation

    Good afternoon, I was reading an article in Chemical Engineering magazine that talked about how to calculate the optimum diameter for a pipe, and it talked about a "Generaux Equation." I was not able to find information on the equation or about the factors. Anyone have information? Regards, Lij
  4. Lijantropo

    Liquid Splash

    Good afternoon, I'm doing the calculation of a distribution pipe (perforated pipe) and according to my calculations came to the hole with 25 psig. From there the fluid enters a highly viscous media -The distribution pipe is used to mix the fluid inside using pressure- My question: there is any...
  5. Lijantropo

    Mixer power

    Good morning, I have three side entry mixer on a storage tank. Those mixers were designed for homgenize oil (18° API) but now, I want to use them for mix an heavy oil (12° API) and some light oil (45° API). Do you know some expresion to estimate the new energy consumption for that change in...
  6. Lijantropo

    Non newtonian pressure drop

    Good morning, I have to pump a non-newtonian fluid (an emulsion). I know some lab properties of the fluids (enough to estimate the apparent viscosity) but I'm not sure of what set of equations I should use. Do you have any good reference where I can find simplified equations for make a good...
  7. Lijantropo

    PSV Relief Requirements

    Good morning, I have to size an PSV that will be located on a air drum. I have been reading the API 521, and from the list of contingencies, the applicable is "external pool fire". The drum is 26ft (height) and 11 ft (diam.) and it will operate at 105 psig & 105°F. The design consider a 3ft...
  8. Lijantropo

    Negative Suction Pressure

    Good afternoon, I have been cheeking the datasheet of a centrifugal pump used to transport water from a storage tank. Looking at the suction pressure I realized that the pump have a negative value (-1.37 psig). The tank and the pump are at the same level and the minimum level of liquid in the...
  9. Lijantropo

    Condensate problems

    Good morning, The background is this: A process tank uses steam to maintain the temperature of the fluid. The condensate leaving the tank passes trough a steam tramp and then, it flows toward the deaerator. The steam is around 140 psia, so the condensate will have enough pressure to flow until...
  10. Lijantropo

    NPSH for metering pumps

    Good morning, I am reading about the NPSH available for metering pumps. I found that the NPSH is static, and it takes into account the height of liquid in the tank, the pressure of the tank, the vapor pressure and specific gravity of fluid at working conditions). On the other hand, I found a...
  11. Lijantropo

    Pressure Drop Equations for Compresible Fluids

    Good Morning, I have been reading about the expressions used to calculate the pressure drop in gas lines and mainly this thread: thread 378-242585 Mr Montemayor uses for his calculations -in the spreadsheet- the expresion given in "Transport Processes and Unit Operations" by Geankoplis. Mr...
  12. Lijantropo

    Recirculation in Centrifugal Pumps

    Good morning, I have a process that needs a constant level in a tank. For this, there is a proportional control valve on the enter line. My question is about the pump that we use to pump the oil: When the liquid level in the tank reach the established level, the control valve will stop the...
  13. Lijantropo

    Software & Hand calculations

    Good morning, When I was at the university, I always heard about the use of simulators as a method to verify hand calculations. Now, in my job, I see that hand calculations are used to verify the simulators. What do you think about it? Which do you believe must be the first step in the design...
  14. Lijantropo

    Pipe Design

    Good Morning, I have read about the considerations for the design of pipe lines and usually, there are two parameters for the selection of the diameter: 1.velocity 2.Pressure drop My question is which one must be the main factor to take into account for the final selection? I mean, the...
  15. Lijantropo

    Vaporization Propane without LPG vaporizer

    Good Morning. I'd like to know how I can estimate the rate of vaporization without a vaporizer or without applying the heat directly to the tank. This is the case: I have a propane tank that storage saturated propane. When the regulator let de vapour above the liquid to go out, the system...

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