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  • Users: JoeChem
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  1. 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...
  2. 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...
  3. 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...
  4. 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.)...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. JoeChem

    PE/PP Resistance to Acetonitrile

    Greetings, I am looking for information on the chemical resistance of polyethylene and polypropylene towards acetonitrile solvent. I am in need of drums to store acetonitrile solutions but would prefer to stay away from any metal if I can due to low tolerance for metal contamination (ppm...
  13. JoeChem

    Valve Manufacturer Advice

    Greetings, I am designing a small batch chemical plant and for the first time ever getting into the real details of piping costs. The piping systems I am considering are 2 in dia or less and low pressure/temperature where stainless steel is more than adequate corrosion protection. Right now I...
  14. JoeChem

    What is "pipe trim"

    Greetings, I am doing some conceptual estimating for a small chemical batch plant. I am relying on a reference Planning, Estimating and Control of Chemical Construction Projects for much of the estimating data. In the Piping Estimating section the authors offer a table of basic piping unit...
  15. JoeChem

    Help with Anhydrous HF Process Design

    Greetings I have been given the responsibility to begin conceptual design work on a batch chemical synthesis process that employs anhydrous HF as a solvent. Essentially, the process involves feeding solid staring materials to a batch reactor system followed by a crystallization and isolation...
  16. JoeChem

    Life In Albuquerque, New Mexico

    Greetings all, I will be interviewing with a company located in Albuquerque, New Mexico. I know the company well and the job is a great fit with my skill base. As the company has expressed great interest also I am assuming we will move forward. The problem is I have lived on the east coast...
  17. JoeChem

    Jacket Design Temperature

    Greetings, I do not have much experience with ASME codes/standards so this may be a very simple question for the experts... I have a small (5 gallon) open top vessel that has a heating jacket rated for 100 psig at 338 F. Can higher jacket temperatures be employed at lower pressures? I have...
  18. JoeChem

    Pilot Scale Hot Oil Systems

    Greetings, I need to purchase a small hot oil system for a pilot plant. Something on the order of 25 KW max and oil temperature in the neighborhood of 500 F. I am not familiar with these systems. Looking for some recommendations for a good reliable skid mounted self contained unit with pump...
  19. JoeChem

    Scrapped Surface Heat Exchanger

    Greetings, I need to specify a scrapped surface heat exchanger for a food process. I have no experience with this type of exchanger and am searching for some information on typical overall heat transfer coefficients generated. I realize values will be material dependent and I am just looking...
  20. JoeChem

    Gas Stagnation Conditions

    Greetings, I am attempting to model a steam distribution system - lots of pipe, elbows, valves, etc. The system essentially boils down to a 10 in main steam supply header feeding (28) 2 inch distribution lines each terminating with a perforated pipe sparger. Ideally, one would assume the T &...

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