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  1. merton

    Structural Design Training for a Non-Engineer

    Hi everyone, I'm looking for some advice and direction on where to start with regards to understanding and design of steel plate & shell structures and welded/bolted connections. I don't want to bore the reader, but here is some backstory... My original training was as a Draftperson and...
  2. merton

    MDMT of A36 Plate

    Can A36 plate be used for a storage tank when MDMT is stated as -20F or is additional testing of material required. What is the MDMT of A36 Plate? Thank you
  3. merton

    Anchorage requirements for Pf Uplift

    If calculations show that no anchorage is required for Net uplift, seismic and wind loading do they still net to be installed to resist internal uplift at the calculated failure pressure? Thank you Vance
  4. merton

    API 12F Skirted Cone Bottom Tanks

    khardy, thanks for the reference text. If possible, could you specify what part of API 620 in particular would provide design parameters for the skirted cone bottom? Thank again
  5. merton

    API 12F Skirted Cone Bottom Tanks

    The API 12F specification references skirted and non-skirted cone bottom tanks. My interest is in the skirted style, but the specification does not provide information on how to design this the components of this assembly. I have a tank design program at work which includes cone bottom design...
  6. merton

    AutoCAD Viewport Problem

    Just to clarify, there are no frozen layers in the drawing and the items cannot be seen or printed from paperspace.
  7. merton

    AutoCAD Viewport Problem

    I have a drawing in AutoCAD 2004 where the text and notes are not displayed in the viewport, but are visible in model space. This is odd as there are other viewports on the same page that display just fine. I have checked the attributes of the viewport and also the layers to see if anything is...
  8. merton

    Flange Max Test Pressure

    When we get into the 2500# ANSI stuff I'm having a couple problems figuring out the max test pressures on the 2500# Flanges. What we're looking at is an customer spec flange (ASME 2500 RTJ, ASTM A 350 LF2 CL-1, ASME B 16.36). Now in all technicality we classify it as a Z662 flange, but our...
  9. merton

    Tank Nozzle Load Calculations

    Does anyone have an Excel sheet or know of similar resources that could assist in calculating nozzle loads for API 650 tanks? Thanks in advance.
  10. merton

    Recommended Reference/Design Texts

    What texts would be benefitial companions to API 650 and API 620? I have been looking at "Design of Plate and Shell Structures (Maan H. Jawad)" and "Structural Analysis and Design of Process Equipment, 2nd Edition (Maan H. Jawad)". If anyone has any opinions or recommendations for other books...
  11. merton

    Anchor Chair Spacing

    Does the spacing of anchor chairs on the tank circumference always need to be equal? I have a situation where I would like to increase the distance between two chairs. Even with the change the total distance between all anchor chairs is still less than 10' on the circumference of the tank as...
  12. merton

    Support Design For Skirted Cone Bottom Tank

    API 12F shows a diagram for support of a skirted cone botton, but does not go into detail regarding how to size the support rings. I also have a tank design program at work which will give design thickesses for a cone bottom based upon cone slope, size of tank and internal pressures. This...
  13. merton

    Threadolet Formula for ASME B31.3 coil design

    Please see the following information below that was forwarded to my by a co-worker. Any suggestions would be greatly appreciated. Thanks in Advance ----------------------------------------------------------- Given the following information Design to ASME B31.3, 2004 Edition After running...
  14. merton

    Roof to Angle Connections in API 650

    Can the details shown in Appendix 'F' Figure F-2 (specifically Detail 'A') be used as alternate roof to shell/angle connections to the roof to shell joints shown in Section 3, Figure 3-3A 'Typical Roof and Bottom Joints'? Thank you in advance.
  15. merton

    Anchor Chair Assemblies

    Can anchor chairs be prefabricated on a repad and then installed on a shell of the storage tank?
  16. merton

    Compression Ring Requirement as per API 650

    When the participating area at the roof to shell junction (without compression ring) is greater than then required participating area as per API 650, does this mean that the roof to shell compression ring may be omitted? (REF API 650 Edition 10, Addendum #4 Section 3.1.5.9 (e) and Section...
  17. merton

    API 650 Appendix 'J' Air Test

    API 650 Appendix states that for tanks 12'-0" or less in diameter a maximum pressure of 5 psi shall be used. Can a lower test pressure be used for this size of tank, between 2 psi and 3 psi for example?
  18. merton

    Air flow through openings

    Is there a formula for calulating the air flow (standard cubic feet per hour) for a tank vent opening given the diameter of the connection and the internal pressure of the tank?
  19. merton

    Repad Sizing for Rectangular Opening in Tank

    I have a situation where a 24" x 36" rectangular manway has been specified in a 1500 BBL (21'-6" diameter x 24'-0 high) storage tank. How do I determine the proper size of reinforcing pad for this opening? API 650 forcuses mainly on round shell openings. Thank you
  20. merton

    Frangible Nozzle

    I have received a bid from an engineering company which is asking for a API 650 tank. This is not a problem, except for the fact that they are asking for some nozzles to be 'frangible'. Has anyone ever heard of this coming up before, and if so where do I look to find design information for...

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