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  1. alchemon

    MS MechE with Math Bachelors

    From a pure employment perspective, I would find no differences between a math Ba and then MS Mech Engr, or math BA and then BS Mech Engr. Logically to me, it would make more sense for you to get the masters because it is the higher degree. My primary concern would be whether you could become...
  2. alchemon

    MS MechE with Math Bachelors

    Do you aspire to become a professional engineer? If so, check your target jurisdiction. Some may or may not accept a masters in lieu of a bachelor's. Also, most masters programs are not ABET accredited, which again is important if seeking professional licensure.
  3. alchemon

    Area Classification of Natural Gas Valve Manifold

    NFPA 497 says a lot of things. Depending on the valve or vessel type, 15' applies or doesn't. Look at the diagrams. It tells you the answers. I have never heard of digging much further than the NFPA 497 diagrams for hazardous area classification. Remember, NFPA 497 classifies electrical...
  4. alchemon

    Pipeline Strain

    Yes, good points made - fully restrained is an idealized condition where as we all know, the soil does not fully restrain (for underground).
  5. alchemon

    Pipeline Strain

    LittleInch, what would be the characteristic length for axial strain for a buried/restrained line? Overall length cannot move much in that case.
  6. alchemon

    Pipeline Strain

    Hello all, First, someone asked as to where I found the 2% strain reference: ASME B31.8, 833.5, allows for specifically design exceeding yield, and (b) of this same section does specifically mention a strain limit of 2% if you design for exceeding yield (various criteria must be met). Second...
  7. alchemon

    Pipeline Strain

    ...does 2% strain mean? If according to Hooke's law, strain = stress/Young's modulus, does 2% strain mean then that the stress state is limited to 0.02*Young's Modulus. For steel at 30,000,000 psi, this results in stress at about 600,000 psi (so that stress/Young's Modulus= 30,000,000 psi)...
  8. alchemon

    pipeline ROW restoration

    I think the OP should make an important distinction with their contractor. Things that got get wasted because it is bad (aka not to spec, the wrong size for rock, spills out of the truck, whatever) is not their problem. If seed and/or aggregate is correctly installed and then is later damaged...
  9. alchemon

    1099 Structural Work

    Just make sure that you have a good contract with them. Something along the lines of.... They accept financial liability for failures should be satisfactory. They probably just need your seal for permits and the like. I'm sure everyone can come to an agreeable solution. But you should be wary of...
  10. alchemon

    Costs of not renewing PE licenses in remote states

    I agree with TigerGuy... Just call the boards of the states you are considering letting lapse. Just tell them that you are considering not renewing because you aren't actively practicing there. Ask them the same questions as far as future renewal and/or fees and then follow up with a summary...
  11. alchemon

    pipeline ROW restoration

    Never seen a published value because... It depends on the means and methods. 20% is comical. I'd reject it and ask why they are allowing that much to go to waste. If they are, that isn't your problem. 5% is probably right, so you should be willing to expect to accept 10%. In the future take...
  12. alchemon

    Best soil for filling under drainage ditches and creeks

    Creeks are filled in all the time for roadways and then they are diverted to a new trench or a so called stream relocation. But yes I meant to fill in to the original creek bottom.
  13. alchemon

    Best soil for filling under drainage ditches and creeks

    I am working on a project that involves laying fiber lines for several miles. We will be crossing multiple creeks and drainage ditches. Several of the creeks are extremely eroded with silty bottoms, and we will need to fill them in to allow for crossing. Similarly, several drainage ditches are...
  14. alchemon

    Stream Channel Stabilization

    Hello all, Thanks for all the responses. To answer a few questions: 1. Yes on certain projects HDDs/trenchless are feasible/economical, on others they are not. 2. The utility line general permits require that the elevations be returned to the original condition. I don't see how you can argue...
  15. alchemon

    Stream Channel Stabilization

    Outside of setting a box culvert or bridge pier into the channel, do you have anything else in mind? For example, I doubt you could pull a permit for riprap in the channel unless it was local to assist scour around culvert/piers. What if you had something more like a linear sewer utility...
  16. alchemon

    Stream Channel Stabilization

    Hello all, I have heard quite a bit about stream bank stabilization techniques but nothing about stream channel stabilization. Is formal stream channel stabilization even feasible with the current USACE general permits (I don't think so) as I think any armoring technique threatens to change the...
  17. alchemon

    Requesting Design Change Orders When you Underestimated Work

    As stated, you need to carefully read the contracts. Specifically, you should focus on the "exclusions and clarifications" that I hope, for your sake, was included. Once you do that, ask yourself, am I doing anything out of scope. If yes, just be upfront with your customer/client and say per...
  18. alchemon

    City Gate Station Bypass

    It might be semantic and I understand that, but we're engineers and should be speaking in technically correct language. ... We say "pushing gas" because saying that a regulator "passes gas" makes some people giggle [bigsmile]!!!
  19. alchemon

    City Gate Station Bypass

    The regulator's capacity, among other things, come into play when the inlet pressure drop. Maybe they are designed to pass X MSCFH at 500 psi. How much can they pass at 300 psi? Also, depending on the design of the station, you may need something like 50 psid to open both regulators. If you are...
  20. alchemon

    City Gate Station Bypass

    Yes I agree that it is more of a theoretical situation, i.e. that the inlet could drop below the outlet. Obviously, if there is demand on the system, it would draw the outlet pressure down. However, the purpose of the bypass is still the same. Which is to say it lets you bypass around the...

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