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  1. GaTechTheron

    HYSYS Dynamic Initialization

    I have a model that drifts a bit from my initial settings. Instead of going back to steady state to reinitialize I would just like to set the values. I put a stream off by itself and specified the composition, temp, and pressure. I used this stream to initialize other streams. I had to do it...
  2. GaTechTheron

    Excel Peng Robinson Vapor Liquid Ratio

    I need determine the ratio of liquid to gas, of a flashing LNG mixture. I'm using Peng Robinson EOS, and I cannot use HYSYS, refprop, or any external tool to Excel. I have the flash calculation working, so I have all fugacitys and relative composition of liquid and vapor for all components...
  3. GaTechTheron

    Flash Point Limit for Dispensing to Open Drain System

    Can a liquid with a flash point at 0[C], but RVP around 3[psia] go to an open drain system? According to API2000, it seems our atmospheric tanks can handle the liquid provided that they meet some venting requirements (flame arrestor, etc), but its unclear if this liquid can be drained from...
  4. GaTechTheron

    Design Press/temp - Low Press & High Temp, OR High Press & Low Temp??

    Degree: Mechanical Engineer Location: Houston, TX USA Experience: Rotating Equipment Design & modular skid Fabricator (4yrs), EPC (2yrs), Owner (4 Years) Position: PM Question: So I have seen this scenario a few times in my career, but would like to better understand what a pressure vessel...
  5. GaTechTheron

    Vacuum Blower Failure

    Have a vacuum blower just upstream of a liquid ring vacuum pump that is failing. We inject seal oil just upstream of the vacuum booster blower for the purposes of sealing/cooling. This liquid that we are using as "seal oil" is actually from the knock out pot just downstream of the liquid ring...
  6. GaTechTheron

    Application of Queuing Theory to Determine Terminal Scope

    We are expanding a terminal to account for a processing facility that we are building. There are some areas that we can save money by combining long lines to docks/rail/truck loading (with multiple different product loading streams) at the expense of product quality / line cleaning. To...
  7. GaTechTheron

    OSHA 33 CFR 155.780 - Emergency Shutdown

    We have ULSD being imported into the terminal. Does this fall under the definitoin of an oil product since it is a "refined product?" 33 CFR 151.05 - Definitions “Oil” means petroleum whether in solid, semi-solid, emulsified, or liquid form, including but not limited to, crude oil, fuel oil...
  8. GaTechTheron

    Groove worn on wear ring surface at the eye of each impeller stage?

    Experts, I came acorss a pump with a radial groove worn on the eye-side wear ring surface at the eye of each impeller? The goove goes the whole way around the impeller. I have seen this as a result of pumping abbrasive liquids, but never so pronouced. The groove almost looks like it was...
  9. GaTechTheron

    Pumping Supercritical CO2

    I came across an application were I need to pump supercritical CO2 in a multistage centrifugal pump at ambient temps. I have a few questions: 1) What considerations beyond that of a standard pump application do I need to consider? 2) How do I determine HP draw with a varying specific gravity...
  10. GaTechTheron

    Vertical Turbine Foundation Load Design

    A few days ago, a rather basic question was posed in which I did not have the best explanation: "Is the pump's thrust load transmitted to the foundation?" My initial response was, "of course." To me, it seems there is an unbalanced load internally to the pump/motor assembly, thus the...
  11. GaTechTheron

    Heat Load of Ball Bearings in BB3

    Hello: I'm checking the heat load of a lube oil system installed on a BB3 pipeline station. Does anyone know how I can determine how much heat needs to be dissipated for the subject-line type of pump? Thanks for your help. Theron
  12. GaTechTheron

    Double Volute Casing Drain Hole [API610]

    I have a somewhat large API610 OH2 pump with a double volute. This pump is holding crude in the "inner" volute because it does not get a chance to drain. The hole drilled through this "inner" volute (connecting the two volutes for drainage purposes) is drilled at 1/8" and keeps clogging. Does...
  13. GaTechTheron

    Impeller Trim

    This seems like a rather basic topic, but I could not find where it has been addressed on these forms. Question: When pumps are operated on electric motors, the motors never operate at synchronous speeds due to the principle inwhich they work. (Back EMF demands current draw to compensate for...
  14. GaTechTheron

    Sealing NGL in a Reciprocating Pump

    We are evaluating reciprocating pumps in NGL service. However, there is an inherent issue with sealing these pumps especially when we have a suction pressure in the 300psi range. Basically, we cannot perfectly seal them (as far as I know). Interestingly, the pump vendor is recommending...
  15. GaTechTheron

    Torque vs Speed Pump Curve

    Question: I have noticed pump companies provide speed vs torque curves for their pumps. These curves are % Max Torque vs % Max Speed. This implies that this curve can be applied to any pump so long as motor rpm and torque (at synchronous operating speed) is known. My question is 2 fold: 1...
  16. GaTechTheron

    Mass Elastic Data

    All- So caterpillar will not release any information on their diesel engines, and I must check skid packaged equipment against torsional critical frequencies. Does anyone know what information I need to supply to caterpillar? What is mass-elastic data? How is this incorporated into a dynamic...
  17. GaTechTheron

    Lubrication of Pump Lineshaft Bearings

    In a vertical turbine pump (VS1), I'm trying to calculate the minimum speed that we can operate the pump. Is there a way I can calculate the minimum speed required to properly lubricate the lineshaft bearings? Is this a function of fluid speed in column, or some sort of pressure drop? I...
  18. GaTechTheron

    UL/FM Limitations on Diesel Driven Firepumps

    I cannot get a straight answer on some of these questions. Can anyone help? I'm currently looking into installing a new UL/FM firepump vertical turbine unit with a requirement of 5000gpm and 180psi. The quote I received on the unit does not have all components UL and / or FM listed. My...
  19. GaTechTheron

    Vertical Turbine Submergence

    A quick question: -Assuming a constant speed vertical turbine in an open pit without a strainer: Does Submergence vary with pump flow? -With a strainer, can you assume that no fluid level is required to avoid vorticity? Or rather, does a strainer surpress vorticity 100%? Thanks!
  20. GaTechTheron

    Calculating Force Absorbed by Seal Faces (ultimately the seal gland)

    There are actually a few questions in this one: I have a high suction pressure application. Infact I will need to use a larger motor because of the upthrust limitations on the bearings (Vertical Turbine with Can). My questions are as follows: 1. Is there a way to calculate the force...

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