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  • Users: starrproe
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  1. starrproe

    Estimating static pressure loss for air-cooled heat excahnger

    Hi All, I am working on rerating some existing air-coolers for higher duty.Initial calculations suggest that by increasing the air-flow(using new fans), while retaining existing bundle, the required process parametres can be acheived. However, since I also need to check suitability of existing...
  2. starrproe

    Reinforcement for closely spaced openings

    My query is for an existing column where I need to introduce a new manway. The location for new manway is in vicinity to an existing 6" nozzle, such that limits of reinforcement of the two openings interact and it represents closely spaced openings per UG-42 of ASME-VIII-1. When I run the...
  3. starrproe

    Difference between SSC, SCC and HIC?

    Hi All, This question may sound a bit stupid to the experts here in this forum, but I just can't resist myself asking you guys as the issue has been bogging me for quite some time. What is the main difference between the corosion mechanisms - Stress Corosion Cracking(SCC), Sulfice stres...
  4. starrproe

    Nozzle reinforcement query - area available in shell

    I am adding a new 16" nozzle to an existing process column: 1. Column dimensions - 8840mm ID x 47000mm T/L to T/L 2. Design pressure and temperature - 3.5 Kg/cm^2(g), 367C 3. Shell and Nozzle neck MoC - SA 516-70 4. Provided shell course thickness - 27mm Required shell thickness due to int /...
  5. starrproe

    Using Manway as Nozzle

    We have a 24" manway with standard flanges per ANSI B16.5 in a 8840mm dia. process column.Our Process engineers want to do some modification, for which they need to use this manway as an inlet nozzle by cutting a 16" opening in the blind flange and connecting it with a 16" line. However, this...
  6. starrproe

    Heat treatment of U-bend in Heat exchangers

    Hi All, Does anybody know of some reference material for guidance on requirements of heat treatment for U-bent tubes of U-tube heat exchangers? I am particularly interested in knowing the conditions under which heat treatment of tubes after bending becomes mandatory. Also, can somebody please...
  7. starrproe

    Double tubesheet exchangers

    Hi all, Can anybody throw some light on the applications of double tubesheets in shell and tube exchangers? I specifically want to know about the process conditions which might require the use of double tubesheets. I would appreciate if some of you could share some reference material on the...
  8. starrproe

    WRC-107 Analysis - Computation of parameter ?

    When calculating circumferential stress parameter Nø/P/Rm from curves 3C and 4C, COMPRESS uses two different “?” values, one for curve 3C and other for curve 4C, for calculating circumferential membrane stresses in longitudinal and transverse axes. However, per WRC-107, for calculating...
  9. starrproe

    Maximum allowable stress value for ASME-VIII-1 material

    Recently, We came across a case where a LAS forging material(SA 336-F5) used for body flange in Shell and tube exchanger had the yield and tensile strength values reported (In the test certificates) above the mimimum values specified in the code(Tables 1A / 1B) by around 10%. The manufacturer...
  10. starrproe

    ASME Appendix 2 flange calculation

    Hi Everybody, I just started designing a heat exchanger body flange using App.2 and got stuck up wondering how this formula works - Minimum initial bolt load for gasker seating, Wm2 = 3.14*b*G*y What is baffling me is that the total area of gasket required to yield by bolting in order to...
  11. starrproe

    Hi All, Can someone tell me as t

    Hi All, Can someone tell me as to what type of block valve (ball / gate) should be used upstream and downstream of relief valves in process piping? Thanks in advance.
  12. starrproe

    Painting before hydrotest

    We have a column, 2m ID x 10.6 m T/T length. Design pressure is 35.6 kg/cm^2. We are planning to paint the column prior to final hydrotest in order to save a few days in schedule and deliver it in time. Is it technically acceptable?
  13. starrproe

    ASME B16.47 Series A/B Flanges

    Hi All, Can someone let me know how do we select on which ASME B 16.47 flange to use - Series A or Series B? Client's specs do not address this and they have asked us to decide.

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