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  1. fegenbush

    Pressurized tanks

    For tank batteries, quantity has a quality all its own. Individually engineered field erected tanks have a schedule associated with them that is not generally conducive to gathering tanks based on the storage requirement per site. For storage tanks, it is more common to use some internal...
  2. fegenbush

    welder qualification

    If your Procedure Qualification Report (PQR) is approved by an AI or is an AWS Standard Weld Procedure, and your internal quality assurance has a record of the Weld Procedure Qualification (WPQ) from the individual welder with a continuity record to back up continuous (usually monthly)...
  3. fegenbush

    API 650 U Anchored Tanks supported by Grillage Beam

    In API 650 12th Edition, Addendum 3, paragraph 5.12.7 recommends using the AISI Steel Plate Engineering Data Volume 2 Part 5. Using the procedure in that standard and making your U-bolts from ASTM A36 material, it is possible to treat these as anchor chairs. Given that this is a non-standard...
  4. fegenbush

    Steam out design of API 650 tanks

    I would design to Annex M to be conservative. Additionally, there are other design factors incorporated into Annex M which may be applicable or otherwise improve the service life of the tank.
  5. fegenbush

    Repairing flange' surfaces

    I agree with EdStainless that my first course of action would be replacement. If there is some reason this would not be feasible, I would machine in place, weld overlay/fill, and machine in place to within origin specifications. Something to consider if you are using the machine in place...
  6. fegenbush

    Change of Product in an Existing Tank

    Horizontal stiffeners will be of negligible benefit alone in resisting internal pressure. Used in conjunction with vertical stiffeners, there is a chance of success, although with significant cost. Replacing the shell courses, even a single sheet at a time, would appear to be more economical.
  7. fegenbush

    Emergency Venting as per API 2000

    "Hexane like" refers to the volatility of the product stored. This is used as a reference to a product which will exhibit a significant evaporation rate at a relatively low temperature. This comparison is considered conservative, as most products do not have such a high volatility as hexane.
  8. fegenbush

    Deflection of Free-standing Jib Crane

    I recommend you calculate the force required to move the load radially inward (uphill) with that deflection. Include friction in your calculation. You may find that deflection unacceptable as the load will be difficult to move uphill, and will want to move downhill should the load be placed...
  9. fegenbush

    API 650 Determine Product Design Stress, Sd, of other materials than Table 5.2a

    takiyasamsama, Yes, 4.1.2 of API 650 permits the use of materials not covered in the standard, *if* the material can be shown to meet *all* the requirements of a material listed in the standard. If your material does not meet *all* the requirements of a listed material, it may not be used.
  10. fegenbush

    6100 lbf load on 3 ton hoist

    tylerdawg is correct. There are places to cut corners in business. This is not one of them. Hoists and cranes are cheap. Lawsuits and human lives are not.
  11. fegenbush

    Measuring bending using strain gauges

    First: The straight gauge is what I would choose to isolate the bending in the given plane. Second: Is your material isotropic and of known modulus of elasticity? If both of these things are not true, it will not be possible to accurately calculate the bending moment. Also, very accurate...
  12. fegenbush

    Material for basering and anchor chair

    I would have no reservations with welding a carbon steel base ring and anchor chair to the stainless steel skirt so long as the weld was made with appropriate filler and the carbon steel and weld were properly coated. Your client may think differently of this detail. There is known glavanic...
  13. fegenbush

    Redesign of existing 12F tank to comply with API 650

    I agree with JStephen that this, if possible, will not be economical. In addition to the previous items, for 12F to API 650 you will require: - Radiography of joints - Hydrostatic test of tank - Addition of anchorage for wind and/or pressure - If no foundation is present, anchoring scheme to...
  14. fegenbush

    Spherical Tank

    A vessel similar to the one you have shown would commonly be constructed to ASME Section VIII Division 2. This standard is detailed as to the radiographic and ultrasonic inspection required. These projects are quite involved and cannot be answered by individuals who do not have a thorough...
  15. fegenbush

    Repair of corrosion hole on nozzle

    The most cost effective solution may be to cut the nozzle neck before the pentration and replace the neck and flange. This would be much easier than a button weld patch.
  16. fegenbush

    effect of temperature on mech properties

    That information may also be found in either API 620 or API 650. However, ASME Section II part D is the gold standard.
  17. fegenbush

    allowable loads at for API650 tank with tank diameter lower than 36m (120ft)

    It is possible to use WRC 107 or WRC 537 to calculate these allowable loads. WRC 537 is the most recent version of this report.
  18. fegenbush

    API 12F

    I agree with everything JStephen said. What kind of information are you seeking, detail drawing or rigorous calculation?
  19. fegenbush

    DESGIN OF LUG SUPPORTS BY BEDNAR BOOK

    Per the reference list on page 418 of Bednar, reference 46 is Roark's Formulas for Stress and Strain, 4th Edition.
  20. fegenbush

    Converting API 650 to API 620 tank

    I agree with JStephen. It is not address how to achieve the additional inspection requirements of API 620. Notably, the combination hydrostatic and pneumatic tests and the radiography are difficult to achieve in the same quality of new construction. What is the intended outcome? Is the owner...

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