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  1. AlmostRetired

    Draining pipe after pumping

    Can you simply blow the line through with compressed air into either the source tank or the destination tank?
  2. AlmostRetired

    short term spikes in the output

    I'm with BrianE22, it looks very much like a ground fault to me. I'd be checking every wire connection to make sure they are tight and have good contact. Noise is also possible if the instrument wires are close to an intermittent high voltage source, such as motor cables, if the instrument...
  3. AlmostRetired

    There are 2 gas compression plant G

    I'll echo what crshears said. Without some numbers, the question is too imprecise to be a realistic one.
  4. AlmostRetired

    Convective heat transfer coefficient vs. gas density (pressure)

    OP, please read 1503-44 and pierreicks's posts again, and try to understand them. Density is a factor in Reynolds No., but plays no part at all in Prandtl No. You mention thermal diffusivity, which plays no part in Prandtl No. at all, though it is a factor in Grashof No., which applies only to...
  5. AlmostRetired

    How do people deal with meetings all day

    Sadly, often the only way to get important info out of clients is when they call a formal meeting to discuss a particular topic, and you take the opportunity to raise all the questions on other topics on that they have ignored in your previous e-mails etc. But from experience I know it may be...
  6. AlmostRetired

    Charging for Meetings/Site Visits Prior to Being Engaged

    As a sole practioner, and a provider of opinions, advice and design-basis information rather than hardware, I work solely on an hourly rate basis, never fixed price jobs, so if a potential client wants my opinion, they have to pay for it - in other words, yes they pay for the initial site visit.
  7. AlmostRetired

    Doing Engineering Calculations From First Principles

    Most of the questions in this forum seem to be about using engineering software, causing me to wonder whether students are actually taught to calculate things from first principles, which means they need to understand what they are doing, or are they just taught how to plug numbers into...
  8. AlmostRetired

    How many hours a week do you work?

    As my handle suggests, I'm out of the mainstream these days, just doing some consulting for one client. So my response to the question is "12-16". Every Tuesday at client site for a full day, and 1/2 - 1 day from home in between those site visits. Just occasionally an extra site day if...
  9. AlmostRetired

    Atmospheric Tank Nozzle Sizing

    A good rule of thumb that I learned many years ago was that the vent nozzle should be at least one size bigger than the largest inlet or outlet nozzle on the tank.
  10. AlmostRetired

    The best engineer

    It's fine not to have memorised every equation you use, but when you look it up, you do need to know how to apply it.
  11. AlmostRetired

    Rupture disc at PD pump discharge

    I have to ask "why are using a rupture disc rather than a PRV?" Latexman's response is correct, and with an RD, once it bursts you are losing whatever the material is until the pump is stopped, they don't re-seat like a PRV. More detail might help us give responses that are not straight from...
  12. AlmostRetired

    How to lean P&ID?

    Hello again Ken, Your interpretation of the difference between an analog and a digital instrument is more or less correct in this case, but showing them differently is not directly because one is digital and the other is analog. The level switch LSH will be a digital instrument in either case...
  13. AlmostRetired

    How to lean P&ID?

    Ken 1972, I'll answer your second post first. This is a classic example of the common practice of using two different technologies to raise a high level alarm (I am assuming the LSH's are both connected to alarms) so that even if one of them fails, there is a high probability that the second...
  14. AlmostRetired

    pH Neutralization of Aqueous Waste

    I have done similar systems for a few clients over the years, so I'll offer some thoughts based on my experience. 1) As the OP suggested in one of his later posts, overshoot can definitely be an issue. You need to "creep up" on the target pH, as explained further below. 2) Unless your tank...
  15. AlmostRetired

    Buncefield report root causes of incident

    Many thanks LittleInch for posting this. I passed the report link on to a client in the chemical industry - not a major hazard facility, but a growing chemical manufacturing business - and they have taken it seriously enough to initiate a wide-ranging review of their entire...
  16. AlmostRetired

    Roles and Responsibilities of Process Engineer

    The title "Process Engineer" can cover a multitude of sins, depending on the industry. My response would be that the job description is whatever your employer wants it to be!
  17. AlmostRetired

    Retrofitted Dimple Plate Jackets

    For Latexman and anyone else following this thread: Applying heat transfer cement has solved the problem spectacularly. Heat transfer has improved by a factor of about 8!!
  18. AlmostRetired

    Retrofitted Dimple Plate Jackets

    Thanks for your response Latexman. Unfortunately the material being heated is a slurry - or to be more precise, ends up as a slurry, solids being added during the heat-up - so a recirc heat exchanger would be another can of worms that I don't care to open. For the time being, we'll just go...
  19. AlmostRetired

    Retrofitted Dimple Plate Jackets

    I’ve been a reader of Eng-Tips for a long time, but this is my first post. As my handle suggests, I’m an old stager Chem Eng just doing a bit of consulting work here in Australia as I transition to retirement. I think most of your regular posters here are from the USA, so it’s worth noting I...

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