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  • Users: fazel1
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  1. fazel1

    stainless steels replacement

    - what is the difference between 304H stainless steel and 304 stainless steel ?as I know the grain size of 304H shall be coarser than ASTM No.7. but all of the mechanical properties of these two kind of steels are the same. - can we use 304ss instead of 316ss at 550 centigrade degree? 316ss...
  2. fazel1

    code case 2235

    what does code case 2235 tell us? can we use A scan ultrasonic in lieu of radiography? or we shall use only C scan?
  3. fazel1

    hydrostatic test ASME SecI

    According to PG-99 (Hydrostatic test) in ASME SecI, at no time during the hydrostatic test shall any part of the boiler be subject to a general primary membrane stress greater than 90% of it’s yield strength at test temperature. 1- How can we check this stress in all parts of the boiler? In...
  4. fazel1

    PWHT ASME B31.1

    Cooling rate in ASME B31.1 shall not exceed 335 centigrae degree per hour divided by 1/2 the maximum thickness of material in inches at the weld , but in no case shall the rate exceed 335 centigrade degree per hr. This means that all the materials which their thickness is less than 2 inches...
  5. fazel1

    NDT of drum

    Based on ASME SecI PW11 it is needed for one of our HP Drums to be full RT , but our licensor have told us to do 100% RT and 100% UT on all circumferrential and longitudinal butt welds of the drum. (The drum tickness is 90mm and the pressure is about 150bar). what kind of defect can we find by...
  6. fazel1

    surfacing

    we want to do the surfacing on a component with the dimensional purpose .in which category in ASME SecIX we can refer to? hard facing overlay or corrosion resistant overlay? non of these items are for dimensional compensation.
  7. fazel1

    weld reinforcement grinding

    is there any limitation in grinding the welds of shell to shell joints when fabrication of the vessel is based on ASME SecVIII div1? can we flush theweld totally by grinding?
  8. fazel1

    allowable stress value for DIN standard

    there is a deffinition of maximum allowable stress in ASME SecII code which is changed by temperature. our design dept use the rules and formulas of ASME code for design of the pressure vessel. But now we have some limitation for purchase of ASME material and we want to purchase St37-2 and...
  9. fazel1

    PWHT minimum thickness

    What is the minimum thickness for performing PWHT base on ASME SecVIII div1, for a vessel? tables of UCS-56 are not so clear .
  10. fazel1

    head fabrication

    we want to make some kind of heads( torispherical , eliptical ,...) . plate of these heads should be made by welding. there are some questions about this: 1- What kind of NDE tests should be applied before and after forming? ( I believe that lamination test for the material and ultrasonic test...
  11. fazel1

    weld distance

    how much should be the minimum distance between the weld of flanges and weld of web , in built up beams? is there any limitation in AWS D1.1 if we put these welds in one line?
  12. fazel1

    finned tubes repair

    we produced some finned tube which are produced by high frequency resistance welding and becaus of the high speed they don't have enough bonding. the thickness of fins is 1mm and the thickness of tube is 2.4mm. which process can we apply to repair these finned tube? (the lengh of tube is 20 meters)
  13. fazel1

    design of heads

    what are the differences of design criteria of torispherical & elliptical heads in ASME SecI and SecVIII? do the tolerances of dimensions different in these two codes?
  14. fazel1

    PWHT thermocouple

    It is stated in ASME sec VIII that it is mandatory to attach thermocouple to the pressure part or vessels when PWHT, if they are more than one part or vessel. In secI nothing is found about this matter. we want to PWHT the drums base on secI and vessels base on secVIII, in a calibrated furnace...
  15. fazel1

    PWHT

    we have a 19mm PNo=1 material which is to be welded to a 19mm PNo=8 material . can we apply PWHT for this joint ? as it is stated in ASME SecVIII there's no need to PWHT of stainless steels, but we shall PWHT the carbon steel. and also in the PWHT temperature of carbon steel, chrome carbide...
  16. fazel1

    position of welding

    Is the definition of upward or downward which is given in ASME Sec IX only for 3G position or it is also for 5G & 6G position?
  17. fazel1

    flame straightening

    where can I find sobject about flame straightening in ASME Code SecI or SecVIII . is it permitted for chrom molybdenum steels such as A335-P22? is it permitted for carbon steels ? what is the maximum temperature for this treatment?
  18. fazel1

    UT of nozzle weld

    I want to do the ultrasonic examination in a nozzle which is welded to a shell . the bevel is 45 degree on the nozzle and there is no beveling on the shell. the nozzle thickness is 14mm with outside diameter of 168mm and the shell thickness is 21mm. from which side of the nozzle do we have to...
  19. fazel1

    two times pwht

    is it accepted by ASME SecVIII to repair many of the nozzle welds of a pressure vessel after pwht and then apply pwht for the whole component, in furnace?
  20. fazel1

    AWS D1.1

    AWS D1.1 in table 4.5 item 32 doesn't clearly define the groove type. for example if we qualify a pqr with V groove do we have to qualify the U groove with another pqr again?

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