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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

    no , we fabricate these vessels under a licence which is base on american standards.
  9. fazel1

    allowable stress value for DIN standard

    yes we fabricate the vessel to sec VIII , Div1. But generally I want to know how to find the maximum allowable stress in different temperature for unassigned materials.
  10. 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...
  11. 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 .
  12. 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...
  13. 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?
  14. fazel1

    finned tubes repair

    metenger we are costomer ourselves. but because of the time and the amount of problem we have to choose the way for repair and if we choose the repair system we can calculate the efficiency by our softwares. would you please offer me the best way to repair? which type of brazing or soldering is...
  15. fazel1

    finned tubes repair

    metenger these finned tubes are so many and if we scrap them it costs very much. we know that efficiency may decrease , but we don't have any other way but repair. so what is the best way to repair them? they are assembled in the harp form and they are not one by one. in each harp we have 3 row...
  16. 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)
  17. 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?
  18. fazel1

    PWHT thermocouple

    where is it stated that we have to attach two thermocouple to our parts if the furnace is calibrated?
  19. 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...
  20. fazel1

    PWHT

    but as far as I understand from SEC VIII UCS-56 PWHT for a butt weld of 19mm plate with PNo=1 is necessary. isn't it?

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