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  1. LearnerN

    French Drain vs Swale - effectiveness at controlling rain runoff

    I am evaluating some options to keep rain runoff from my neighbor's property from getting as much onto my property by my house. His property has a fairly steep slope down to mine, and mine has some slope, but some of that run-off pools along the side of my garage. I'd like to divert that...
  2. LearnerN

    Flange Rating vs Pressure Test on Flange

    My question pertains to steel gas transmission pipelines with flanges being hydrotested. If it's 600# class, then the flange rating is 1480psig. However, the pressure test often exceeds 1480psig, sometimes to 150% of the weakest component on the pipeline (like the flanges). My question is...
  3. LearnerN

    Vehicle crossing "parallel" to steel pipeline

    Generally, I understand vehicle crossings of steel pipelines need to be crossing perpendicular to the pipeline...and that is what the standard calculations and procedures have in their focus for vehicle crossings and stress analysis. Operating companies rules generally say "NO parallel vehicle...
  4. LearnerN

    Hoop VS Combined Stress - Steel Pipeline

    Newbie question here. I'm considering a calculation where a vehicle load will be crossing directly over a steel pipeline (5' soil cover). I'm using the Spangler equations for vehicle loads. I'm assuming max operating pressure in the pipeline so have 72% capacity for hoop stress. Following...
  5. LearnerN

    equipment skid C.O.G.

    When designing a structural steel skid to support piping and valves, what rule of thumb should guide how far off from the center of the skid the fully-assembled-skid C.O.G. should be allowed for safe lifting of the fully assembled skid during construction? In the past, I've typically just made...
  6. LearnerN

    Interstate hazardous liquid pipelines - how to determine all pertinent legislation?

    I think it is no surprise to any of us in the oil/gas pipeline industry that some people may play "loose" with state or other non-federal legislation and ignore it as having any authority or relevance so long as you're basically following the CFR's and ASME and industry standards. In terms of...
  7. LearnerN

    Pipeline career change consideration: consultant engineer to operator engineer?

    Everyone: I'm needing some career advice. For a while now, I've been considering if it would be a good fit (and career move) for me to move from working as a consultant engineer in liquids/gas transmissions pipelines to working as an engineer for an operator company. I'd greatly appreciate...
  8. LearnerN

    Nitrogen Purge - resources

    What are some good resources on how to make plans for a successful nitrogen purge of a liquids line?
  9. LearnerN

    Thrust block design for large pipeline

    I'm considering a preliminary thrust block design for a large steel liquid-products pipeline (20-24"). I am familiar with the engineering principles behind the design of a thrust block (as well as having experience with soils and structural design), but the only thrust block design guide I've...
  10. LearnerN

    Eccentric load bearing capacity VS overturning check

    I'm considering the design of a footing for a 25' tall, 24" OD process tower that only weighs 7500 pounds. It'll be on a large footing mainly due to the overturning effect of wind loading. However, I'm trying to figure out how to get the eccentric loading bearing pressure calculation to work...
  11. LearnerN

    Slab on grade & frost heave

    What are some of the best ways to have a slab on grade and yet protect against frost heave?
  12. LearnerN

    Pier vs Column (concrete design)

    What is the typical distinction between a pier and a column, like in concrete design? If my understanding is right, a pier is often less deep than it is wide...and used for bearing only. A column, on the other hand, would be like where a footing would be needed in terms of spreading out the...
  13. LearnerN

    Vertical vessel footing - when is vertical flexure reinforcement needed?

    Newbie structural engineer question. I am considering a 30ft tall vessel (36" OD) that weighs 34,000 pounds. Originally, I was thinking of using a standard square footing with vertical axial/flexure reinforcing in the column. But now I'm thinking of just a square block foundation. What is...
  14. LearnerN

    Dynamic foundations - 5x the weight of equipment

    I recently heard that some ACI resource on dynamic foundations says that the foundation can be sized as a block of reinforced concrete 5x the weight of the dynamic equipment. If someone knows what I'm referring to, could you mention what resource and section of the resource this is located in...
  15. LearnerN

    Foundation design with applied moment at top of pedestal

    I am considering a square footing design for a tall vertical vessel, the vessel of which will yield an applied moment at the top of footing pedestal due to wind load and such along the tall vertical vessel. (I'm a fairly new structural engineer and will have my design reviewed by another...
  16. LearnerN

    Is 100% bearing contact always required?

    In checking P/A +/- M/S for eccentric loading on a rectangular footing: is it left up to engineering judgment and a client decision to determine if slightly less than 100% bearing contact pressure is acceptable, OR is this never acceptable? This is in regards to a 30' tall vertical vessel on a...
  17. LearnerN

    Benefits of soil borings for HDD planning

    In my experience, soil borings are always strongly recommended for any HDD, especially for things like river crossings. But in terms of explaining their value for an HDD to the client, how are soil borings' value best conveyed? (I'm thinking of an example of let's say a 10" steel pipeline...
  18. LearnerN

    Design Factor for liquids line in HCA

    Newbie question: I've heard before that the design factor for a hazardous liquids line in an HCA is 0.5, but I can't find this in the CFR or where this came from. Can someone direct me to the right resource? Thank you.
  19. LearnerN

    ACI 318 & footing - development of flexural reinforcement VS development of deformed bars in ten

    In designing the flexural reinforcement in a footing, the development length calculated is of deformed bars in TENSION, and the development length distance is from the edge of the pier (as the critical section). This makes sense since the moment in the footing will be putting the steel in...
  20. LearnerN

    Development length of 90-deg bend hooked bar in tension

    For a 90-deg bend hooked bar in tension, what is the actual development length being measured? I think I've seen conflicting illustrations. Is it: (1) a distance along the bar from the critical section to the furthest distance parallel to the bar that the hook reaches, OR (2) the distance...

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