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  1. manian

    Fishing and Milling

    Can anyone help me with a good source/link for Fishing and Milling technology ?
  2. manian

    VALVE BODY SHELL STRENGTH CALCULATIONS

    i would suggest, i) Use the ASME Section VIII Division 1 UG27 + Appendix 1 methods ii) Use ASME B16.34 - One of the appendices provides the method for wall thickness calculation. iii) Use Din 3840 i have been predominantly using ii) and supplemented with iii) and i). Hope this helps Bye
  3. manian

    Pararel Slide & Wedge gate valve

    The parallel slide gate valve has a parallel disc sealing against seats by means of spring force, whereas a wedge gate valve has a wedge shaped disc which gets locked on to the seats by means of the mechanical seating load applied. Where a very tight shut off is required generally wedge gate...
  4. manian

    1.I need reference websites for man

    You could also check with Novamag Italy - a cost effective source.
  5. manian

    Hard chromizing of stainless steel ball valve

    It is often a common practice to do Electroless Nickel Plating of Balls for superios performance.
  6. manian

    Test procedure for butt weld end valve

    In general a test bung with an 'O' Ring is used and the bungs on both ends of the valves are clamped together before applying pressure. This is very effective and proven methodology. Also, for buttweld end valve, since radiography is mandatory the standard allows you to offer them as special...
  7. manian

    Difference between "CLASS" and "LBS" in "Valves"

    i understand LBS is an older terminology and the correct method to designate would be to use CLASS according to ASME B16.34 Regards Manian
  8. manian

    Valve Sizing Equations: What is Correct?

    The different flow conditions viz., liquid, gas, mixed are to be dealt with differently. While the liquid sizing is easier and straightforward, the gas sizing equations tend to get more complex due to the compressibility etc. The calculations are simpler as long as there is no choking. If a...
  9. manian

    Non-circular Flange Design

    What are HEI standards and where are they available from? Regards
  10. manian

    Help me choose steel....please...

    Shape being square might have a tendency for uneven distibution of residual stresses. May be you can try with a round bar?
  11. manian

    Newsgroup, mailing list or discussion forum on pressure vessels

    i would suggest we make use of the Valve Engineering forum itself to discuss on Pressure Vessel issues also. i tend to raise issues related to pressure vessels there itself, since valves and pressure vessel issues are more closely related. i invite all those with similar interests to kindly...
  12. manian

    Piping flange thickness design.

    Flange design approaches are available in ASME Section VIII Division 1 Appendix 2, DIN 2505 and DIN 3840. You can refer to any of these codes and design your own flange meeting your needs. Ofcourse these codes have their own limitations and one has to understand the code thoroughly before...
  13. manian

    Mechanical Properties of F6a Cl 3 Material after Double Tempering

    Valve Stems are often made out of ASTM A182 Gr F6a Cl 3 materials. When these stems are required for NACE MR0175 service, these have to be double tempered. However, the ASTM standard A182 does not list the properties after double tempering. Can any body help me with an authentic source for the...
  14. manian

    SS 316 and 316L Stainless Steel Materials with high strength

    Valve Stems, Gland Eye Bolts and Pins are often required in SS316 and SS316L meeting NACE MR0175 requirements. Due to solution annealing the mechanical properties drop down to very low limits. Can some one suggest suitable alternate materials for these applications. Minimum yield strength...
  15. manian

    Can anybody highlight on dimensions of dishedend as per admerkblatter?

    With some experience in using both ASME and AD Merkblatter codes, i observed that for a dome type cover the shell thickness required in AD Merkblatter is considerably more than that as per ASME. One reason for this could be due to the difference in safety factors recommended in the two codes...
  16. manian

    Allowable Stresses for Low Alloy Steel Castings

    ASME Section II Part D deals with allowable stresses for various materials. While ASTM A487 Gr 4 Cl A material is covered, some of the other classes of this material like Cl D are not covered. Could any one throw some light on this and the reason behind it ?
  17. manian

    ASME B16.20 Ring Gaskets

    ASME B16.20 covers SS Type 316 Ring Gaskets and indicates the hardness requirement as 160 HB max. Could the same requirement be specified for SS Type 316L Ring Gaskets also ?
  18. manian

    ASME Section VIII Division 1 and Division 2

    ASME Section VIII Division 1 Appendix 2 gives the design procedure for flanges using allowable stresses as per Table 3 for bolting materials in Section II part D. Similarly Section VIII Division 2 Appendix 4 cross refers to Appendix 3 for Flange Design but with design stress intensity for...
  19. manian

    Flow through swing check valve

    The effect of the actual velocity being less than the minimum required velocity for full disc lift is 'chattering' i.e partial opening and closing of the disc continuously thereby leading to the wear and damage of sealing surfaces. Hence, it absolutely essential to size the check valve properly...
  20. manian

    book for valve design

    i have come across the book called Valve Handbook by Philip Skousen, which is worth the buy. it gives contemporary information on valves. you could check it out with a leading book seller.

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