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  • Users: jnich
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  1. jnich

    Mating RFWN Flange Joints of Unequal Thickness

    You will always want to match the w.t. of your RFWN flange with your pipe (ie STD x STD or XS x XS). This has to due with weld penetration ability, as zdas04 mentions, and passing your weld x-ray tests per DOT (if you're DOT regulated, like all the work I do). I don't believe what BigInch...
  2. jnich

    Pipeline Quantities (Pipe & Fittings etc)

    In the past, we've done 10% minimum extra on the bulk items like line pipe, fittings, gaskets, bolts, etc. We've been saved by this conservative strategy a few times due to Bill of Material errors. For items that you may only have 5 or 6 of, we'd order an additional one often. It's often...
  3. jnich

    Thermal Relief of ASME B31.3 piping

    This philosophy has been applied in larger crude oil systems I've worked on, but the check valve line that bypasses your process block valve also had smaller block valves installed upstream & downstream of the check valve. Normal process is to have the smaller block valves on bypass line...
  4. jnich

    Flow by gravity in a not full pipe

    Since this flow is driven by gravity and your viscosity is relatively high, you may only have laminar flow within the pipe. If so, this simplifies your friction factor if using Darcy-Weisbach. Check your Reynolds Number (Re) for flow regimen. If your flow is indeed turbulent, I'd recommend...
  5. jnich

    API 5L grade B PSL2 in US?

    We commonly specify flanges to match the schedule of the piping it connects to (usually designated as "SCH 80" or "STD" for our pipeline work). This will match the flange bore with pipe bore. After providing the forged material spec (ASTM A105), we also specify ASME B16.5 (as opposed to...
  6. jnich

    Existing pipe below new slab on grade

    What are the design loads on the SOG? What is material is the water main made from? Soil type?
  7. jnich

    Pipe Racks/Pipe Supports

    Yep, you need to pass the heat to your pipers and mechanical engineers to lay out the pipe and establish their elevations. My experience in pipeline facilities has been that establishing the suction hydraulics to pumps is the first step in the design. Once the piping is laid out to satisfy...
  8. jnich

    Coefficient of cohesion of soils and angle of friction relation using the Rankine method

    Iasonasx - how is the soil classified that you are trying to retain? If you're retaining a 100% fine-grained (clay or silt) soil, then theoretically you will not have a friction angle (φ = 0 or φ' = 0). Usually the critical parameter for fine-grained soils is the cohesion (c or c'). Friction...
  9. jnich

    What "GAGE" stands for in AISC?

    What table are you referring to? I was taught the term "Gage" to be the centerline bolt spacing between two or more connections that are transverse (perpendicular) to the load direction. The can be different from how "jimstructures" defined it above, depending on how loads are applied (e.g...
  10. jnich

    Asme 16.20 gasket material

    There's definitely a difference, but it may not matter depending on your application. Both 316 and 316L will outperform 304 regarding corrosion-resistance. 316L has a slightly lower strength (SMYS & UTS) compared to 316, but is easier to weld and will resist corrosion better compared to welded...
  11. jnich

    Steels ASTM A6 and A20

    Manufacturing items to two (or more) specs is very common with pressure vessel/piping compoenents in my experience. Often any given item will have a "dimensional tolerance" spec along with a "material" spec. ASTM A6 is more of a "dimensional tolerance" spec and is very common for structural...
  12. jnich

    Hex Nuts

    Thanks guys. All of these posts have been helpful. After reading these posts, I'm going to approach the lead about the design basis for using only jam nuts to connect static anchor bolts to base plates.
  13. jnich

    Hex Nuts

    On a current project I'm working on, the lead is specifying jam nuts with anchor rods/bolts that connect multiple baseplates to their foundations on the latest drawings. At times he calls out two jam nuts to be used for conencting to the baseplates. I believe AISC code specifies that Heavy Hex...
  14. jnich

    API5L vs. API2B Standards

    API 5L is for conveying fluids, like fegenbush says. You'll want to stick with A53 pipe for anything structural-related. Any reputable vendor/supplier should be stocked full of A53 pipe, unless they had a major run on it for some reason.
  15. jnich

    Parallel flow pipe network help

    We had this argument in my office recently on the total pressure loss in a system with a run of parallel pipes. Since the pressure loss in both pipes has to be equal (assuming steady state conditions), would you analyze the streamline flow path of one particle through the system (traveling...

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