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  • Users: engpes
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  1. engpes

    Construction Contractors License

    Has anyone ever taken a heavy equipment contractor's license exam(state of LA). As a mechanical engineer, is this something i need to study for? Is it law references or common since math that an engineer could figure out? Sorry but there is limited information. Thank you.
  2. engpes

    A 572 Gr 50

    What are A572 Gr 50 typical charpy impact test values are -20C? I know this varies quite a bit, but am curious if anyone has a typical range. The typical requirement is 20 ft-lbs at this temp,i believe. What are the odds / % that a typical US steel mill without any specific post processing...
  3. engpes

    FRP Gasket Material

    I have an FRP piping application operating at 150 psi and 275 F. I am trying to determine the best gasket material to use. The medium is salt water. What is the best gasket that will seal and not overstress the flange from over torquing? Thank you in advance.
  4. engpes

    Sulfatreat Bed Design

    What is the typical differential pressure to use in the design of a sulfatreat bed? Standard operating pressure is at 50 psi, and we have always used 5 psid as the differential through the medium. Is there any published value to use as a standard? Thank you.
  5. engpes

    Normalizing SA105 Material for Nace

    I have an existing ASME VIII, Div 1 pressure vessel that I am not 100% sure the SA105 flanges have been normalized. The H2S partial pressure is not super high, only 1.25 psi. Is normalizing of SA105 required per section A.2 of NACE MR0175 if the hardness requirements are met (187 HBW)? My...
  6. engpes

    ASME VIII, Div 2 Conical Transition with Flare & Knuckle

    Hi, I am trying to determine the hoop and membrane stresses in a conical transition per ASME VIII, Div 2 section 4.3.12 and table 4.3.7. I am having trouble specifying the variable Rf and Rk which are the radius to center of curvature for the flare and knuckle respectively. I have my rk and rk...
  7. engpes

    AWWA Flange for ASME VIII, Div 1 Service

    I have an AWWA table 4 class E flange that we are planning to use on a 42" OD vessel. The flange is a 42" 125# slip on flange per AWWA table 4 class E. My design pressure is 150 psi @ 200 F and is SA105 material. I tried analyzing as an ASME VIII, Division 1, Appendix 2 flange, but it did not...
  8. engpes

    ASME B31.3 Mill Tolerance

    Is there any way to avoid using the full 12.5% mill tolerance in pipe wall thickness calculations and still be ASME B31.3 code compliant? Can the wall thickness be measured and applied in the calculations without the mill tolerance? Or with a reduced mill tolerance? I have an existing pipe...
  9. engpes

    SA-455-B Material

    I have an existing vessel that was built SA-455-B material (heads and shells). Per ASME & MTRs the yield is 35,000 psi and the ultimate is 70,000 psi. These yields are very close to the yield for more typical SA516-70 materials. My question is as follows: 1.) What weld wire should be used...
  10. engpes

    API 6A Secondary Stresses

    API 6A section 4.3.3.6 for non standard materials limits the hydro membrane, stress intensity at working pressure, and primary + secondary stress limits as follows: ST = min[(5/6) x Sy, (2/3) x Rm] Sm = min [(2/3) x Sy, (1/2) x Rm] Ss = min [2xSy, Rm] My question is can the primary + secondary...
  11. engpes

    Grinding Circumfrential Seem Flush

    I have an ASME VIII, Div 2 Part 5 design by analysis vessel. For a number of reasons I am required to weld a support saddle on top of the circular seem (RT1 full radiograph). The wall thickness is 3.5 inches, so the seem is fairly wide. My question is: 1.) Are there any ASME code violations...
  12. engpes

    ASME VIII, Div 2 Part 5 Design By Analysis Method

    I have an oblong nozzle with complex geometry. It will require an ASME VIII, Div 2 Part 5 FEA analysis. For construction reasons, a repad will be more practical for the application. My question is as follows: 1.) Can stresses be linearized through the vessel wall and repad combined in order...
  13. engpes

    ASME VIII, Div 2 Drawings

    I have any ASME VIII, Div 2 vessel design. The customer would like to have a drawing that only includes dimensional information (no material grades, bolting, design conditions, corrosion allowances, etc.). They are wanting to locate all of this design information on a separate document to make...
  14. engpes

    ASME VIII, Div 2 - Part 5 Design by Analysis

    I have a high pressure vessel that I am analyzing per ASME VIII, Div 2 - Part 5 with a design pressure of 10,000 psi. I am using elastic stress analysis method an have a question in regard to the local nozzle analysis. The nozzle is having high bending + primary stresses at the radius of the...
  15. engpes

    B31.3 Piping Post Weld Heat Treatment

    I have a few pipe spools that will be designed for H2S / sour gas service. The spools are basic schedule 80 (0.337" wall) API 5L X42 pipe material. The wall thicknesses are under the required ASME B31.3 thicknesses (19 mm) requiring stress relieving, but the spools will need to be NACE MR0175...
  16. engpes

    ASME VIII, Div 2 Part 5

    Section 5.7.2 in ASME VIII, Div II Part 5, states that the "service stresses" in bolts for a flange design may be higher than the "allowable stresses" of Annex 3-A (ie ASME IID). It states that the max service stress value may be 2.0 times the allowable stress values listed in Annex 3-A / IID...
  17. engpes

    ASME Section VIII, Div 1, Div 2 or Div 3

    We are designing a high pressure vessel (10,000 psi design pressure), and are trying to determine which ASME section VIII division to design it to (1, 2, or 3). Division 3 in the opening remarks says that it should be used for vessels exceeding 10,000 psi, but does states that it does not...
  18. engpes

    Gas Bottle

    I am designing a gas bottle for welding that will be handling propane, oxygen, argon / CO2. I need to design the bottle to ASME VIII, Div 1. My questions are: 1.) Does the ISO 9809 specification for "Gas Cylinders - Refillable Seamless Gas Cylinders" apply to this design? 2.) My main...
  19. engpes

    Spiral Wound Gasket Compression

    I have an existing 2" 150# RF spiral wound flex gasket that has been in service for a while. We suspect that the initial torquing of the bolts may have been over torqued and the gasket may have been over compressed. The gasket is functioning properly in service and not leaking. My questions...
  20. engpes

    Choked Flow

    I have an natural gas application that appeared to be very simple, but am having trouble gathering information from the manufacturer. I have an existing in service adjustable choke that that I know the orifice size for, but cannot find the flow coefficient from the manufacturer. This would be...

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