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  1. arunb

    Water quality requirements for once through steam generator.

    Hi all, I would appreciate information on the water quality requirements for a once through heat recovery steam generator with steaaming conditions of 4140 kPag and 400 degrees Celsius. Thanks arunb
  2. arunb

    Painting for heat traced & insulated vessel

    There is a carbon steel vessel with skirt (handling natural gas) that is electrically heat traced and insulated. The question is does the vessel require painting? If yes what type of primer and paint. My concern is that the paint must not impede heat transfer or burn fron the heat tracing. The...
  3. arunb

    Buckling of spiral wound gasket with graphite filler

    Regarding switching from rubber to spiral wound gasket, the spiral wound gasket is about 0.1" thicker than the rubber gasket in the compressed position.I have asked for an assessment of the piping to be done viz. flexibility and stresses to determine if it appropriate to make the change. We use...
  4. arunb

    Buckling of spiral wound gasket with graphite filler

    Thanks for the information which certainly was helpful. However would like a clarification whether the inner ring is recommended for graphite fillers or is it used across the board for all fillers.
  5. arunb

    Buckling of spiral wound gasket with graphite filler

    Hi everyone, I am looking to substitute EPT rubber gasket with SS304 spiral wound gasket (with 99.5% graphite filling) on all piping flanged connections. I have read that there are quite a few cases of buckling of the metal winding and then finding their way into the piping. I was looking for...
  6. arunb

    HH1150 double age as per NACE MR-01-75

    Hi, I have requirement to use 17-4PH stainless steel(Condition H1150) for valve stem. I have an offer for HH1150 double age as per NACE MR-01-75 from a supplier. Can I use this instead? I can't find the specification properties for HH1150, these are not listed in ASTM standards- do I assume them...
  7. arunb

    Material for valve stem A564 Gr. 630 (H1100)

    Hi to all, An existing valve stem (Alloy steel 13 Cr.,1 Moly, HB-220-260) is to be replaced. The valve maintenance group prefer A564 Gr.630 (H1100)to be used. 1)I went through the ASME B31.1 Code and found that it is listed under Bolts,Nuts & Studs Austenitic. The max. allowable stress values...
  8. arunb

    Pressure drop through Tee/ branch fitting

    EAYVJER: I would approach the problem as addition of the folowing losses: 1) Loss through branch fitting 2) Sudden contraction from 1.5 to 1 inch. diameter 3) Orifice loss This would of course mean considering the full flow through the branch.This would give the max. loss for the branch...
  9. arunb

    Pressure drop through Tee/ branch fitting

    TDK: Thanks and would appreciate your scanning and sending me a copy of the page referred in your reply. My email address is batraarun@hotmail.com
  10. arunb

    Pressure drop through Tee/ branch fitting

    TD2K: Thanks for your reply.For the first part I have been following the approach you have indicated. You mention the change in size is not so extreme. Can you quantify this? In the case of flow through run of 10" line (which has 1" branch), I presume the pressure drop is neglected...
  11. arunb

    Pressure drop through Tee/ branch fitting

    Regarding pressure drop for flow through a tee the pressure drop factors given in Crane, Flow of Fluids is K=20fT for flow through run and K=60fT for branch. I require clarifications on the following: 1)Is there any limitation on tee size for using the above. Say if I have a 10 inch. pipe with...
  12. arunb

    Min & Max velocity in pipes

    I will first answer regarding the minimum flow velocity in a pipe.The minimum velocity is generally dictated by economic considerations; if you take a lesser velocity you end up with a bigger pipe size.The other considerations would be fouling characteristics of the fluid. Regarding maximum...
  13. arunb

    Deaerator

    It is not clear why the condensate tank is being retained, otherwise as such it is not required when a deaerator is being considered and could simplify the system.I presume the condensate pressure is not adequate to bring it to the new deaerator.In any case it may not be necessary to heat in the...
  14. arunb

    Pressure drop through strainer mesh

    Thanks to the responses to my query to the above respondents. The responses have given me something to think about,which I think helps in getting the full perspective and solving the problem. This also requires me to answer some questions. 1) The screen mesh sizing is not adequate as it is...
  15. arunb

    Pressure drop through strainer mesh

    Hi: I am looking to establish the flow resistance for a rectangular wire mesh strainer fitted in a lube oil tank to handle higher flow requirements.(The present strainer does not handle the flow requirement and there is a backing up.) I would like to estimate the pressure drop for different...
  16. arunb

    Pressure drop through strainer mesh

    Hi: I am looking to establish the flow resistance for a rectangular wire mesh strainer fitted in a lube oil tank to handle higher flow requirements. I would like to estimate the pressure drop for different screens. I would appreciate any help on formulae or correlation for this calculation...

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