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  1. bellowsmfg

    Pipe shoe / anchor / guide detail allowable forces and moments

    In the support of your schedule this has been done many times before, per pennipiper's link, in addition to guide and line-stop member member details. I do recommend though that the stress engineer selects the support based off the load. Depending on the experience of the piping designer or...
  2. bellowsmfg

    Minimum wall thickness in bends

    metengr is correct. Depending on how the elbow/180 degree bend is formed, there are thinning calculations to determined the final wall thickness of the bend. However, the wall thickness's of available pipe are standard so you usually have some fat in the selection (be is schedule 10, 40, 80 and...
  3. bellowsmfg

    pressure pulsation at rated point

    This is very open without knowing what the rest of the system it like. Can you start with describing how the piping layout is on the suction and discharge of the pump? Bellows Manufacturing and Research, Inc. https://bellowsmfg.com
  4. bellowsmfg

    Bellows Seal Gate or Globe

    There could be several issues here so I'll hit on a few and you can look further into it. A. Pressure Trust - When a bellow is put under pressure it produces a pressure thrust (P x Ae), where P is the Pressure and Ae is the Effective Area of the bellows. If the connecting ends are not property...
  5. bellowsmfg

    piping stress analysis required?

    If you are operating at ambient temperatures a stress engineer won't blink at it unless you have other design criteria that will raise concern (seismic or offshore in your case). If the new connections are adding flexibility into the system then you'll need to review the support system. Too much...
  6. bellowsmfg

    Orifice flange with corner taps

    ASME B16.36 will be your guiding reference. Note that 150# Oriface flanges do not exist as the flange thickness is considered too thin for the hole. Conor Bellows Manufacturing and Research, Inc. https://bellowsmfg.com
  7. bellowsmfg

    Re-pad on Branch B31.3

    Note that 45 degree reinforcing pads is tricky to make and hard to install. Make sure that bevel and weld details are correct for the profiles you'll need. Bellows Manufacturing and Research, Inc. https://bellowsmfg.com
  8. bellowsmfg

    Flange bolt pattern

    MichMC hit the nail on the head. The standards he referenced - B16.5 covers flanges up for connecting to pipes up to 24 inch and B16.47 above 24" pipe up to 60". The details and dimensions are the ASME standard and suppliers in the US adhere to these. Bellows Manufacturing and Research, Inc...
  9. bellowsmfg

    Flexible Bellow Deformable

    Thank you for clarifying Ronald Bellows Manufacturing and Research, Inc. https://bellowsmfg.com
  10. bellowsmfg

    Piping with possible thermal expansion loop needed to pump suctions

    The loop is there for a reason and if you are to modify the piping, you will need to have a pipe stress engineer look this over. It looks like the loop is absorbing thermal expansion of the piping from the piping outwards and from the riser above. When modifying lines like this we sometimes...
  11. bellowsmfg

    Flexible Bellow Deformable

    Ronald, Have you resolved your issues with the modelling of the below? Regards Conor Walshe www.bellowsmfg.com Bellows Manufacturing and Research, Inc. https://bellowsmfg.com
  12. bellowsmfg

    how to connect cs flange to ss flange

    This is commonly done were you have a spec break. The gasket ensures the two flanges are not in contact with each other so the only galvanic corrosion issue would arrise at the bolt/washer to flange interface when/if the metals are dissimilar. Note reiterated above on the pressure rating...
  13. bellowsmfg

    Expansion Loop Design

    Pipenewbie, In addition to the comments above, and apart from the math, a major reason is real estate and practicality. You're original sketch takes up a larger corridor. The loop from BigInch takes up only local real estate. Do you have access to an experienced piping desinger or engineer? A...
  14. bellowsmfg

    Hydraulic Loads at Pump Casing due to Improper Flexible Coupling Installation

    IBechir, If you are still there, the effect that is been covered here is called "Pressure Thrust" will is equal to the effective area of the expansion joint (Which is usually bigger that the OD of the pipe) X the pressure in the pipe. Expansion joints are designed to allow movement in...
  15. bellowsmfg

    Rubber Bellows vs Metal Bellows Expansion Joints

    Edward hit on a lot of good points and I'd like to add to them. First of all, you need to be aware that a tank has some different characteristics then we normally see in a vessel. The nozzle at the bottom of tank will rotate downwards. This is due the shell deflecting out when the tank is...
  16. bellowsmfg

    Tank Implosion due to insufficient vent diameter

    A lot of good things covered here. Utilizing API 2000 is a great one. The major thing that stands out for me in addition to what is discussed here is the 20m length of vent pipe (in addition to your other pressure drop cause by extra elbows and fan). Vents on tanks should be short as possible. A...
  17. bellowsmfg

    UT of in service tanks

    Are these tanks pressurized? If so then they will most likely need to be proof tested and then wall thickness inspected and NDT inspected for defects. If not required, then the above comments are correct. UT wall check wont be affected with liquids internally. www.bellowsmfg.com Bellows...
  18. bellowsmfg

    Aircraft Pneumatic Duct Wall severely dented/creased: methods/techniques to restore roundnesss????

    do you have a picture of it maybe you can share? Bellows Manufacturing and Research, Inc. https://bellowsmfg.com
  19. bellowsmfg

    How does HydroTesting unit work? I searched online alot but just found vendors who are selling it

    I highly recommend contacting the Compressed Gas Association (CGA) and obtaining their directives regarding Hydrostatic Testing. They provide very detailed written and schematic information that will give you the guidance you need. Bellows Manufacturing and Research, Inc...
  20. bellowsmfg

    Hydro Testing

    The industry standard for Hydrostatic testing is the US Department of Transportation. Reference DOT 49 CFR 178.37 as an example. under 3AA Pressure Vessels (Hydrostatic Testing) The gage accuracy requirement is (1%). Where does (0.2%)become a requirement? You can find the above reference in...

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