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Recent content by gfdoug

  1. gfdoug

    Buried Pipe Design (B31.3 & DOT) - API 1102 vs ASCE

    As far as I am aware, there are two different codes that can be used for buried pipe design underneath a road crossing: API RP 1102 for Steel Pipelines Crossing Railroads and Highways AND ASCE Guidelines for the Design of Buried Steel Pipe. I am having trouble coming up with any major...
  2. gfdoug

    High Temperature piping - Air-to-Soil interface

    Thanks LittleInch, You seem to always have sound advice. So I appreciate your comments as an avid forum-lurker. I will look in to both of these options more in detail. At first glance, the polyolefin only protects to 230F (on-shore) and 285F (off-shore). I am not sure what the driving...
  3. gfdoug

    High Temperature piping - Air-to-Soil interface

    Hello all, I am in the process of looking for a product to use as corrosion / moisture protection on a steel pipeline at the air-to-soil interface. The line will be running at approximately 240+ Deg. F filled with decant oil. The pipe will be covered with a polyurethane thermal insulator...
  4. gfdoug

    FABRICATING BARS ON TEE TO MAKE BARRED TEE LOCALLY

    I recently helped design one of these. You will be welding "bars" in to a pup piece and then welding the pup piece to the "teed" section of pipe forming your tee. There's no true standards to help guide you during this. A couple issues we ran in to were: 1) fabricating and cutting the bars...
  5. gfdoug

    Finding your own work when working at a corporation?

    I work for a relatively large employee-owned company. We also expect our employees to help find their own work, but that by no means meant that employees are expected to find ALL of their own work. You may ask for someone to redefine what they meant by it. I've worked here close to a year and...
  6. gfdoug

    nozzle load

    You can also translate the global loads using basic trig if necessary.
  7. gfdoug

    Pigging through valve - Unequal wall thickness

    LittleInch, Where would I get the 1:4 slope value from - pig manufacturer, valve, engineering standard, rule of thumb? Thanks -G
  8. gfdoug

    Pigging through valve - Unequal wall thickness

    The flow is from 0.375" to 0.500" - wall thickness gets larger (aka ID gets smaller in the diretion of flow). I haven't gotten as far with the valve - I am attempting to get in contact with the valve manufacturer to see their recomendations as well. Their cut sheet has the nominal bore of...
  9. gfdoug

    Pigging through valve - Unequal wall thickness

    All - I'm preparing to order a through-conduit gate valve (24") to replace in a 24" line. On the downstream side the wall thickness is STD (0.375") on the upstream side of the valve the pipe is XH (0.500"). Since the bore of the line is changing, do I need to make any special considerations...
  10. gfdoug

    Pipe Stress Analysis - Translating moment around pipe inlet

    All - I am currently in the process of designing a piping system that offloads LNG from a railcar. The simplified version of this is that I have an 8" pipe with a swivel-arm setup that can attach to the railcars as they approach to offload. I am currently creating a stress analyis model...
  11. gfdoug

    Work Life Balance (update)

    I just moved cities myself. This will be the 3rd time in 5 years, so I'd like to think I've gotten pretty good at it. The key to enjoying any place is determining what makes YOU happy and meeting the right people. You seem to be striving to find some social connections - so I'm going to...
  12. gfdoug

    Unsupported Pipeline Spans Found On Operating Pipelines

    In my experience, typical installation temperature is 70 deg. F while the operating temperatures depend on your aparatus. In Ethanol lines I've seen weather temperatures applied for the area which were something along the lines of 0-120F, but for a heated butane vapor line I've seen up to 220F...
  13. gfdoug

    Mine shaft piping stress analysis

    In my experience, operating pressures are not the driving cause for increasing resultant stresses in most cases - generally the highest stresses are going to occur during your Gravity+Temperature(Max,Min) cases.
  14. gfdoug

    Should I negotiate my salary?

    I'm under the impression that you should ALWAYS negotiate offers. Like you said, the worst case scenario would be that they say no. You won't ruffle feathers or get off on a bad foot if you do it in the correct manner. In fact, you may even show that you are a "go-getter". I'm making the...
  15. gfdoug

    Butterfly valve

    Agree with the majority here. Stamping these without tests would be quite unethical.
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