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  1. Bartholomew69

    BS 1501 151 28A

    I have an old vessel that needs to be recertifed to PD5500. The original material of construction is BS 1501-151 Gr28A. I cannot find any references to this material on the net. Is the current equivalent BS 1501-151 Gr 430A?? Bart Bartholomew Pr. Eng (mech) Nautilus Engineers
  2. Bartholomew69

    Jacketed Vessel Closure

    Appendix 9-5(c)(5) gives the formula for j for types 2 - 5 jacketed vessels as "Maximum allowable width of jacket space". When I apply this formula I get a very small value for j. Is this really the maximum allowed? I would appreciate some help from those with experience on App. 9 Bart...
  3. Bartholomew69

    ber(x) and bei(x) functions

    Can anyone tell me where to fin the Kelvin (Bessel) functions bei(x) and bei(x) and their derivatives?? I can only find BesselY(x,n) and BesselJ(x,n). Bart Bartholomew Pr. Eng (mech) Nautilus Engineers
  4. Bartholomew69

    ASME VIII 2004 Part UHX Tubesheet

    I have been doing calculations on tubesheets using UHX-13. I am using a excel spreadsheet and am looking for excel formulae for the Bessel functions (actually Kelvin functions) [b]ber(x)[b] and [b]bei(x)[b]and their derivatives. Can anyone help - I can only find the BesselY(x,n) and BesselJ(x,n)...
  5. Bartholomew69

    Welding on work hardened austenitic s/s

    Goodday all; I have a spherical presure vessel, about 8m in diameter, 5 bar design presure, 75 deg C design temperature, manufactured in 1980 to the Swedih Pressure Vessel Code, and the Swedish Cold Stretch Code. This code was basically used prior to the advent of duplex materials, by using...
  6. Bartholomew69

    Welding on work hardened austenitic stainless steel

    Goodday all; I have a spherical presure vessel, about 8m in diameter, 5 bar design presure, 75 deg C design temperature, manufactured in 1980 to the Swedih Pressure Vessel Code, and the Swedish Cold Stretch Code. This code was basically used prior to the advent of duplex materials, by using...
  7. Bartholomew69

    lack of penetration in a 30 year old vessel

    I have a 30 year old vessel that was recently modified (one section was cut out and replaced)- it has operated without problems up to now. Once cut it was discovered that the longitudinal seam had lack of penetration due to the weld preperation (double vee with central 'shoulder'). It was in the...

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