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  1. JoeChem

    Sizing Vacuum Pump for Batch Distillation

    The most important piece of information needed when sizing/rating vacuum systems is the actual air leakage rate. Without this data you will be wasting your time as this item cannot be determined with any reasonable accuracy using correlations, nomographs, etc. Plan for an opportunity when the...
  2. JoeChem

    Dust Combustibilty Testing - What is the Correct Particle Size

    Greetings, We have an existing process where we load a solid into a hopper on top of a batch reactor and charge to a liquid (well below flash point). The solid is granular (roughly 1/16"-1/8" dia) and is free flowing. Closer inspection does reveal the presence of a significant amount of...
  3. JoeChem

    Vacuum Pump Non-Condensible Loads

    Greetings, Working on a prelimiary design for a new processing facility - reactor followed by 3 distillation columns. Need to develop a sized equipment list for approximate total installed costs. The columns are to be operated under vacuum conditions and working on sizing vacuum pumps for the...
  4. JoeChem

    Feedback on "The Ladders"

    Greetings, Considering starting a job search, looking for a good career building move. Not really unhappy where I am just see limited options for growth. Saw some commentary about recruiters in other threads so though I would post a question of my own. Does anyone have any experience working...
  5. JoeChem

    H2S Production and Solubility/Equilibria in Solution

    Geetings, We have a facility that uses H2S as a raw material. We currently handle in rail car quantities but due to safety concerns we want to look at producing H2S on site to reduce stored inventory. I am aware of technology that produces H2S continuously by reacting NaHS and HCl (or H2SO4.)...
  6. JoeChem

    Orifice Flow/Pipe Entrance Loss Coefficient Question

    Geetings, Originally posted this on the Fluid Mechanics forum but no activity so I thought I would try here... Was recently trying to calculate an accidental discharge of liquid from a tank (small hole) and was scratching my head about some things in Crane TP410 and was hoping to get some...
  7. JoeChem

    Flow Coefficent for Orifices

    Geetings, Was recently trying to calculate an accidental discharge of liquid from a tank (small hole) and was scratching my head about some things in Crane TP410 and was hoping to get some clarification. I was not sure if I should approach the leak rate calculation using an orifice equation or...
  8. JoeChem

    outlet manifold pipe sizing

    Until you develop some awareness that providing meaningful help with a technical question requires some technical information the only answer you will likely get is: Good Luck.
  9. JoeChem

    Sloped Cylindrical Tank Level

    Sorry - I did not choose my wording well. The real question I had is how to relate tank level to volume. If the tank is horizontal the level-volume relationship is not that involved. For a sloped tank the relationship is more complex. The tank will be multipurpose - so the SG will change...
  10. JoeChem

    Sloped Cylindrical Tank Level

    Greetings, I am putting together a process design package for a batch plant expansion. We need to install a multipurpose cylindrical 40,000 gallon horizontal storage tank. To minimize holdup we are planning to slope the tank. We would like to measure the liquid level in the tank so we know...
  11. JoeChem

    Leaving first job?

    A star for you Mike - excellent advice. First post I've ever seen that describes the correct way to move on from existing employment. Employment is nothing more than a business deal - once either side finds it to be less than satifactory it is time to consider moving on. Resignation letters...
  12. JoeChem

    Jury Duty

    I have been called 5 or 6 times over the last 20 years. I the area where I live any time you involved in a motor vehicle episode where a ticket is issued (even a parking violation) you can bet a jury summons is on the way. I went the first time - complete waste of 4 days. Since then I ignore...
  13. JoeChem

    Chemical Plant Construction Time Estimation

    Another excellent reference is Planning, Estimating, and Control of Chemical Construction Projects by Navarrete and Cole. This book covers all types of construction time estimating from conceptual to detailed. Cuts to the chase without alot of excess verbiage. mfetzien - you mentioned...
  14. JoeChem

    High Temperature Scrapped Surface Heat Exchanger

    Greetings, In the middle of a front end design for a high temperature (230-250 C) process (CSTR) that involves reacting fatty acids. Need to transfer lots of heat as the reaction is endothermic. The mixture is also viscous so considering using a pump around with a scrapped surface heat...
  15. JoeChem

    Power Number for Anchor Impeller

    Greetings, I am scaling up a new product that will be produced in a 3500 gallon batch reactor that is equipped with a anchor style impeller. Need to understand mixing characteristics and power draw for this unit. Trying to find some power number vs Reynolds number data for an anchor impeller...
  16. JoeChem

    what a waste of time and energy..

    Westheimer, To tell you the truth, all of my interview experiences from ther time I graduated college to present day have been very similar to your episode. 1-2 phone interviews followed by a whole day on site talking with personnel of various levels was par for the course. In one case I had...
  17. JoeChem

    Gravity Flow through Side Exit Pipe

    Greetings, I am working with a cooling tower where the water outlet from the collection basin is a horizontal-side exit 14 inch pipe. I am trying to get a handle on the flow rate through the exit as a function of the height of water filling the pipe. The exit system is based on gravity flow...
  18. JoeChem

    HX Dirty Overall Coefficient Question

    The service in the case is water - water. The shell side is high pressure tempered water - closed loop pumped system (very clean)for cooling a batch reactor. The tube side (3/4" OD tubes)is cooling tower water. The fluid velocity on the tube side is 4.9 ft/sec. Before I submitted the design...
  19. JoeChem

    HX Dirty Overall Coefficient Question

    Thanks for all the feedback. Speco - I agree with what you are saying. If the information(i.e., fouling factors) I initially provided are unrealistic then the supplier should indicate so and offer their recommendation(s) on their heat exchanger specification sheet. If they are using a "dirty"...
  20. JoeChem

    HX Dirty Overall Coefficient Question

    Greetings, It has been some time since I have specified a heat exchanger. The last time I did, there were two overall heat transfer coefficents provided on the heat exchanger specification sheet - clean and service coefficients. Now I see a third coefficient - dirty. I am having some...

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