Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: MrPDes
  • Content: Threads
  • Order by date
  1. MrPDes

    Use of ASME VIII Div 1 weld geometry in API 530 creep designed equipment

    A component subject to creep is designed in accordance with API 530. The code provides simple methods based on primary membrane and bending for calculating stresses and thicknesses in a cylinder and elbows and says that butt welded ASME B16.9 fittings are acceptable for use with API 530. There...
  2. MrPDes

    ASME B16.9 wrought Tee with weld within it

    Section 1.3 of ASME B16.9 specifies the following: “Fabricated laterals and other fittings employing circumferential or intersection welds are considered pipe fabrication and are not within the scope of this Standard.” If two halves of a large tee are forged then welded together with 100%...
  3. MrPDes

    Calculate Fatigue Life of NPT Thread

    I have thermowell that fastens into a blind flange using a 1/2" NPT tapered thread. There is only pressure cycles. No external loads. The vessel is designed in accordance with ASME VIII Div 1 and the fatigue assessment in accordance with Div 2. I am trying to find the most labour efficient...
  4. MrPDes

    Is Section IX QW-403.6 minimum thickness applicable to St/Steel 304 SAW butt weld?

    I have a Stainless Steel 304 butt welded (SAW) with a MDMT of -196°C. The base metal and HAZ are exempt from impact testing per UHA-51(d)(1)(a). The weld metal is not exempt from impact testing per UHA-51(e). The PQR therefore has impact testing. For the minimum coupon thickness, QW-403.6...
  5. MrPDes

    Equivalent Stress at root of Fillet Weld for fatigue assessment (Nozzle Re-Pad)

    I have an Ellipsoidal Head with a nozzle in its centre. The nozzle has a Reinforcing Pad with a fillet weld around its outside diameter. The "effective alternating equivalent" stress at the root of this outer fillet weld is needed (in accordance with Step 3 of 5.5.3.2 of ASME VIII Div 2.), so...
  6. MrPDes

    Nozzle in Ellipsoidal head designed to Code Case 2286-4

    Code Case 2286-4 provides alternative rules for designing cylinders, cones, spheres and heads for external pressure. The design for an ellipsoidal head has reduced the thickness of a convensionally designed VIII-1 head from 53mm to 41mm. The code case provides rules for locations and sizes of...
  7. MrPDes

    Switching Coordinate system of Construction Geometry - Mechanical WorkBench

    I have drawn many path lines between two points relative to the Global Co-ordinate system. I should have made it relative to a custom local co-ordinate system. When I now switch the co-ordinate system the lines move to a new location relative to the local co-ordinate system. Is there a way of...
  8. MrPDes

    Design individual component to Code Case 2695

    Compress has the option to design an ellipsoidal head to Code Case 2695 (ASME VIII-2 rules). When this option is selected the nozzles attached to the head are also designed to Code Case 2695 (ASME VIII-2 rules). Is there a way to have the head designed to VIII-1 rules and only an attached...
  9. MrPDes

    Creep design above 100,000 hours?

    For time dependent properties, the stress values in ASME II Part D are for up to 100,000 hours only. I need to calculate an allowable stress for 150,0000 hours using the rules in ASME II Part D Mandatory Appendix 1. I have figured out how to derive Minimum and Average Rupture Strength from API...
  10. MrPDes

    Allowable secondary stresses around supports of Cold Stretched Vessels

    I have a cold stretched vessel that is to be fabricated from 304 Stainless. The pressure envelope is designed to ASME VIII Div 1 Appendix 44 (Previously Code Case Code Case 2596-1). This allows for using an allowable design stress S of 270MPa (rather than the usual 138MPa for non-Cold...
  11. MrPDes

    UW-13(c)(1) Intermediate Head - Close Fit Definition

    For an intermediate head in accordance with Fig UW-13.1(e), Section UW-13(c)(1) says: "...the outside diameter of the head skirt is a close fit inside the overlapping ends of the adjacent length of cylinder." Does anyone know if there is a definition for "close fit"? Shaft tolerance tables...

Part and Inventory Search

Back
Top