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  • Users: isoca
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  1. isoca

    Information to be reported in a CMTR

    Is it acceptable for ASME III code to complete a CMTR using OK or NOK instead of the numerical value? For example, in a production of 10,000 tubes, should the actual value of the external diameter of each tube be reported?
  2. isoca

    Equivalent diameter in tensile test

    A client has sent us a specification to manufacture 316L tubes (12.7 mm OD) wich indicates the tensile test shall be carried out using a gauge length of 5D, where D is the equivalent diameter. My question is, what does it mean by "equivalent diameter"? The specimen shall be tested in full cross...
  3. isoca

    Hydrostatic test according to ASTM B 163

    Hi everyone, I have an inquiry directed mainly to those that are familiar with ASTM B163 (or ASME SB-163). In the hydrostatic test point it is indicated that the tubes shall be tested at a pressure of 1000 psi provided that the fiber stress wich is indicated in the same standard is not...
  4. isoca

    Increased emissivity in stainless steel

    I am working in a project where I have to increase the thermal emissivity of a tube made of SS 316L. One option is to produce an oxidized surface treating the material at 350ºC in an air atmosphere in order to have a blueish surface. Does anyone have any experience in this type of process? I...
  5. isoca

    Standard for titanium corrosion testing

    Hi there, I have to compare the corrosion resistance in HCl 20% of two titanium alloys. Could someone recommend me some ASTM standard to do it? This test is only for comparison purpose. Thanks
  6. isoca

    Bar internal soundness

    This is a query basically related to the language and its interpretations (my native language is Spanish). A client request us: "Each rolled bar which will be used for tube manufacture shall be examined for internal soundness by taking macro specimens at each end of the bar". My doubt is related...
  7. isoca

    316 stainless steel wire drawing

    I need to calculate how many wire drawing passes I need to bring a 14mm diameter 316L stainless steel bar to a 2.5mm diameter wire. Although there is a lot of information in the literature on how to calculate it, I would like to obtain real values based on experience and not theoretical...
  8. isoca

    Deviation from SA-213

    A client has sent us an specification for tube manufacturing which indicate that the material shall be manufactured under ASME II SA-213 and and the additional requirements specified herein. The SA-213 indicates for flaring test a minimum expansion of 30%, however, for this test, the client...
  9. isoca

    U-bend tubes heat treatment

    Hello everyone, A customer has asked us to anneal the bends of SS 304 U-bend tubes. As is often the case, he has not specified the treatment conditions. The treatment will be carried out using electrical resistance equipment (joule effect) For now we know that it must at least reach 1040 degrees...
  10. isoca

    ASTM std applicable for ASME sec II

    Hi all, I have a doubt about which revisions of the ASTM standards should be used when manufacturing a material under the ASME code section II. To be clear, if for example I have to produce a tube according to ASME section II SB-213 2019 edition, I have to perform a tensile test according to...
  11. isoca

    Material for Helical Cooler tubes

    A client has asked us to manufacture a helical type cooler which is submerged in an aqueous solution of 11% sulfuric acid and 25% sodium chloride, at 55 °C. Initially, the client proposed to manufacture the tubes with CP titanium, however I have some doubts about their resistance considering the...
  12. isoca

    Material for Chemical Reactor Vessel

    A customer wants to change a chemical reactor vessel that works with a solution of: 20% methanol, 60% glycerin, 3% sodium chloride, 1% hydrochloric acid and 3% fatty acids. The reactor works between 70ºC and 80ºC. Currently the equipment is made of carbon steel with an internal PVDF coating. Due...
  13. isoca

    Spiral crack on Alloy 800 tube under tensile test

    Dear colleagues, I am performing some analysis on seamless tube of alloy 800. During tensile test at 350°C I have found that the tube, in all the cases, break forming a spiral crack. At room temperature, the material break in a standard way (forming a neck). In both cases the fracture surface...
  14. isoca

    Strain Rate in Tensile Testing

    I am looking information on how to calculate strain rate in tensile testing if I only can control crosshead speed. Thanks
  15. isoca

    Stress relief on U-bend tubes of Ti Gr 2

    Hi all, I am looking for information about U-bend stress relief in seamless tubes of Ti Gr 2 for heat exchangers. Up to now I did not find any standard or code with information as time, temperature, etc for this heat treatment on Ti alloys. Our client request that the treatment is performed...

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