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  1. Abhijeet242

    Flash vessel control valves

    @MJCronin Thanks for the cool link about steam system.I am not designing a complete flash system and so no reason to expect any further questions. At this point, I also dont have much information or lets say, not much information which I could share, from my client. But what I understood is...
  2. Abhijeet242

    Flash vessel control valves

    Thank you for the comments community! The fluid here is Deaerated water/ steam.
  3. Abhijeet242

    Flash vessel control valves

    Hello community, I am working on a selection of control valve, which will regulate the inlet to the Flash vessel. The sizes of the inlet and outlet of the valve are DN600 and DN1800. Is it realistic? Are there any flash vessels with the inlet flanges more than DN1000 or so? Also one more...
  4. Abhijeet242

    Core box manufacturing for casting

    In case of Casting....for example...a volute casign, the volute core is made using core box. The core boxes and the patterns are made either out of wood or metals( e.g. Aluminium). I wanted to understand,how volute pattern and core box itself is manufactured in Aluminium/wood? How volute shape...
  5. Abhijeet242

    Limit of Shaft deflection at Mechanical seal faces as per API 610_What is the significance of value?

    The recommended limit as per API610 is 50 microns....what is the basis of this limit? why not 40 microns or 75 microns or any other value?
  6. Abhijeet242

    How to weld "Weld neck flange" to Tubes?

    Tubes are designated by its outside diameter. So if we need weld 1" OD tube having 0.15 inch thickness with WN flange, then what should be the size of the flange selected? Can we use flanges as per ASME B16.5? Or is there any other standard followed for flanged connections of the Tubings?
  7. Abhijeet242

    Density of Silicon Carbide vs. Density of Steel

    Why density of silicon carbide is less than ( almost half) that of steel, even when the hardness of the SiC is more than steel?
  8. Abhijeet242

    Why Gasket load formula 3.14Gby in Wm2 and why is it 3.14G(2b)m.P in Wm1?

    My question is, as per Mandatory appx.2 from ASME Section VIII div.2. Why the area of gasket considered for Wm1 and Wm2 is different? In case of Wm1, the formula is, Where, the area of gasket considered is , 3.14 x G x 2b And in case of Wm2, the area of gasket considered is, 3.14 x G x b...
  9. Abhijeet242

    How Martensite forms in low carbon SS like A743 gr. CA6NM? And why not then in Ferritic grades of SS

    Thank you for the response. May be i did not clarify it properly in my question. Actually I mean to say, we say that ferritic stainless steels like grades AISI 405,409,410,434 etc. These grades they contain low carbon and hence, as you said,are only slightly hardenable. However, when we see...
  10. Abhijeet242

    How Martensite forms in low carbon SS like A743 gr. CA6NM? And why not then in Ferritic grades of SS

    CA6NM typically contains Carbon not more than 0.06%. However, Ferritic steels contains carbon upto 0.12% yet, the steels are not hardernable. What is the reason behind it?
  11. Abhijeet242

    Computational Fluid dynamics....How can I understand the physical significance of PDE?

    How can I understand the physical significance of the terms Hyperbolic,parabolic, elleptic PDEs? I do not want mathematical explanation. I wish to know what are real life examples through which I can understand these terms? What is the physical significance of Characteristic curves?
  12. Abhijeet242

    What effect does Chromium content of 0.5% in Low alloy steel have?

    Especially in case of A216, Cr content is restricted max. to 0.5%. Chromium is stable carbide former. Which carbide is formed in case of this Steel, C23C6 or Cr7C3? What effects does the normalizing and tempering has?
  13. Abhijeet242

    Why bolt torque is T = (Friction factor) x F x D and not the radius?

    Dear community, thanks for the overwhelming response. Sorry for the late reply. I see people asking about why am i confusing the torque required to rotate the disc with the Bolt torque. Well, answer from my point of view, is that, both of the things are accomplishing quiet same results only the...
  14. Abhijeet242

    Why bolt torque is T = (Friction factor) x F x D and not the radius?

    We know that the torque is Force x moment arm. Here in this case why the moment arm is not radius. The real problem for me is that, I am calculating friction torque required by the rotating disc to overcome. Here the I have done the calculations with below 2 methods: 1. In close approximation...
  15. Abhijeet242

    Double Nut ( Jam nut) Bolting and thermal expansion

    desertfox (Mechanical),drawoh (Mechanical),HTURKAK (Structural) and all, Thank you for the answers. As you have correctly pointed out desertfox (Mechanical), the explanation belongs to the same link you posted. After going through the comments, I have realised that the Stud clamped with Bolts is...
  16. Abhijeet242

    Double Nut ( Jam nut) Bolting and thermal expansion

    In case of Stud, when it is jammed with the help of two nuts i.e. 2nd nut on the top of one nut, is it possible that the Thermal expansion effect will be cancelled. Is it the reason why, normally equipments like Pumps are bolted to Baseframe with the help of Double nut? I think this restricts...
  17. Abhijeet242

    Gasket_Flange Joint

    Thank you very much for all the answers LittleInch and MJCronin. Few things in the discussion above clarified a lot of things for me. Very correctly pointed out that,the flanged piping joints are the places where small misalignments are resolved. The O-ring system will surely be impractical for...
  18. Abhijeet242

    Gasket_Flange Joint

    Thank you @saplanti for the reply. In addition, i wish to know, why this is not common practise to use grooved joint with o-ring or confined gasket? Which one is more advantageous? In my opinion, grooved o-ring of confined gasket should yield technical advantage over regular flange joint with...
  19. Abhijeet242

    Why in case of Stainless steel, microstructure is essentially stabilized to Austenite?

    Thank you for the reply @EdStainless. It is certain as you pointed out Stainless steel is available in Ferrite, martensite as well as duplex. However, when it comes to corrosion resistance except duplex, they are not as corrosion resistant as Austenitic SS grade. So that brings me to the...
  20. Abhijeet242

    Why in case of Stainless steel, microstructure is essentially stabilized to Austenite?

    Ni or Mn are two Austenite stabilizing elements. In SS popularly 18/8 steel, where Ni is used as an Austenite stabilizing element,why is it essential to stabilize Austenite microstructure? Is it to avoid Carbide formation with Chromium? If yes, then how making Austenite stable helps to avoid...

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