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  1. Brandon181

    Multi-pass Air Cooler Condenser

    A thermal engineer I work with designed a LPG Condenser Air Cooler and I have a few questions regarding the manufacturing of the unique design. The unit is 36' long with 6 passes/6 rows, Cstl, plug box header. The temperature inlet/outlet split are 500/109 F. There are two bays in parallel...
  2. Brandon181

    tubesheet hole diameter

    TEMA table RCB-7.41 lists tube hole diameters and tolerances. In my opinion, it is important that those tolerances are maintained for many diffent reasons, however I do not have any personal operation experience dealing with an exchanger with oversized tubesheet holes. Perhaps you might find...
  3. Brandon181

    Sec VIII Div 1 Appendix 14

    UG-39(c)(3) When the large opening is any other type than that described in (c)(1) above, there are no specific rules given. Consequently, the requirements of U-2(g) shall be met.
  4. Brandon181

    "Cold" Service Metal welded to "Normal" Service Metal

    I have a small piece of "in-line" equipment made up of a cylinder and flange on each end. The cylinder was specced as SA-333 Gr. 6 (min temp -50F at my thickness by B16.5). The flanges were specced at A-105 (min temp -20F by B16.5). The MDMT for this project is -20F. I have two questions...
  5. Brandon181

    Air Cooler Bug Screen

    @ko99: Thank you so much! I was being dense and not taking into consideration the varying geometries. What you say makes perfect sense when I actually think :) Any experience as to whether it is common to place bug screens on inlets of air cooler fans? Although I see the problem with the...
  6. Brandon181

    Air Cooler Bug Screen

    We have requested a bug screen be placed at the inlet fan shrouds of our air coolers (mounted on pipe rack). The vendor has come back saying this cant be done, due to performance and maintenance issues. However, they have proposed an alternate scenario where the bug screen is placed in the...
  7. Brandon181

    Momentum and Friction Loss vs Static Loss

    My process group provides us with "allowable" pressure drops for our shell and tube exchangers. Using HTRI we design an exchanger and it reports the "calculated" pressure drop for the unit. On certain designs we have done, the "calculated" pressure drop was greater than the "allowable" given...
  8. Brandon181

    Liquid-Liquid Static Mixer

    Latexman, Thank you for your response. This is exactly what I needed. Now I can request homogeneity numbers from both companies and either disqualify the cheaper one or prove that it satisfies our specs. Like you said, the pressure drop should largely be determined by L/D, and both companies...
  9. Brandon181

    Liquid-Liquid Static Mixer

    I am evaluating two quotes on a Liquid-Liquid Statix Mixer. My conern is that one company is quoting a calculated pressure drop of 0.83 psi while the other is quoting a pressure drop of roughly 8 psi during normal flow. The first company (0.83 psi) has quoted one less element and is about half...
  10. Brandon181

    S&T Gasket Replacement Before Nitrogen Purge

    SnTMan: No offense taken. I do not write the specs or choose which specs get included into the inquires. This is above my pay-grade. And I understand your feelings that the shell and tube spec could be expanded to include those requirements found from the PV spec. TJOrlowski: It is my...
  11. Brandon181

    S&T Gasket Replacement Before Nitrogen Purge

    Thank you for the responses. innovation2: You are correct in assuming this is a carbon steel shell. And it's my understanding that periodic testing of the nitrogen pressure would need to be made whether the gaskets are replaced or not, so leaking of nitrogen would be detected. Although I see...
  12. Brandon181

    S&T Gasket Replacement Before Nitrogen Purge

    I have some questions/concerns regarding drying of a shell and tube exchanger after hydrostatic testing. My work is mostly in the sulfur/amine processes. If it is pertinent, which I do not think it is, the specific exchanger type I am looking at is a BEU. However, I would prefer general answers...

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