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  1. TJOrlowski

    Does the Circ Joint in a Flanged & Flued expansion joint require full X-Ray?

    We are getting some pushback from a Canadian safety authority in their review of our application for CRN on one of our straight tube HX designs. The design contains a simple flanged & flued expansion joint per Appendix 5 and TEMA. The flanged and flued heads we are using are small: 10-3/4" OD...
  2. TJOrlowski

    The "Pause" - A Review of Its Significance and Importance to Climate Science

    I'm just glad moltenmetal isn't in charge of running the economy (although I suspect it's pretty high on the priority list). Just a personal story: my home heating bill has in fact decreased every year as the cost of oil has come down. When oil was trading at $120/barrel, I was paying...
  3. TJOrlowski

    ASME HX - Tubesheet to Shell Weld

    We've seen vessels sent in for rebuild that have integral tubesheets attached in this manner (usually the vessel originates from Europe). As others have pointed out, it is an inferior joint. We always end up replacing the tubesheet and matching it to the shell OD. -TJ Orlowski
  4. TJOrlowski

    Min. Thickness of exchanger tube

    I would expect the result in your asme.pdf to be the most valid result. For cylinders under internal pressure, ASME Section VIII, Div 1 requires the designer to consider both the longitudinal (circ joint), and the circumferential stress (long joint), and use the thicker of the two for required...
  5. TJOrlowski

    ASTM 270 for use as SS Sanitary Tubing in ASME pressure vessel

    Innovation is correct. Either ask the mill / distributor to quote you with sanitary tubing to SA-270 that is also manufactured and certified to SA-249. If that does not work, purchase the tubing in SA-249 regular BA finish, and send the tube to an aftermarket polisher who can clean, polish...
  6. TJOrlowski

    U or UM stamp

    See paragraph U-1(j) Depends on design pressure and internal volume. Note that a UM stamp is an option (subject to customer / local jurisdiction approval; you can always stamp U. -TJ Orlowski
  7. TJOrlowski

    Poorly paid, exploited, or typical?

    GregLocock, Two other options: Organize a labor union with the other employees, petition an existing labor union to come in and negotiate with the employer on their behalf. Employers are in no way, shape, or form market-makers; nor do they have the "vast majority of the balance of power."...
  8. TJOrlowski

    Poorly paid, exploited, or typical?

    In my opinion, anyone that believes, or promotes the notion that employers "exploit" their employees are looking at the situation from the wrong prospective. Employers are not market-makers: they pay for the services of their employees at the rate which the market demands. Nothing more...
  9. TJOrlowski

    ASME NTIW Tubesheets calculation

    Somewhat off topic: I think I know exactly which reviewer at ABSA is looking at ReddeV's heat exchanger. We are currently experiencing a similar bottleneck with one of our designs that already holds CRN approval in multiple other provinces. It is. . . time consuming. -TJ Orlowski
  10. TJOrlowski

    ASME Flange Design

    Don't you just love it when "new and improved" design formulae condemn equipment that has been working beautifully for decades?! Suggest you try a cammprofile gasket or reinforced grafoil gasket, something with a low m and y value as fegenbush alluded to. You may also want to try low-stress...
  11. TJOrlowski

    TEMA AES Design

    If process engineers are specifying type S heat exchangers across the board, but it could be advantageous to explore using other configurations on a per-application basis, I don't see why you wouldn't weigh other options - if there is the will and the way to do so. In my view, best practice is...
  12. TJOrlowski

    TEMA AES Design

    If your shell-side temperature and pressure are less than 400F and 200 PSIG, and your shell-side fluid is non-corrosive, you may consider a type AEP or BEP configuration. It's been my experience that there are less problems with gaskets vs. type S units. If you have > 200 PSIG shell-side...
  13. TJOrlowski

    Material Specification - SA105, SA106, SA234

    Remember, MTR's and CofC's are supporting documentation. From a dimensionsal standpoint, the part itself controls whether it is acceptable. If the dimensions on your parts are within the current tolerances, then the parts are acceptable. You should have provisions in your QC manual for...
  14. TJOrlowski

    S&T Gasket Replacement Before Nitrogen Purge

    Brandon181, Concur with SnTMan: what is the reason that your pressure vessel spec requires that the test gaskets shall not be suppiied with the finished product? Does that reason make sense, and is it even applicable for shell & tube heat exchangers? Mandating that all gaskets be replaced...
  15. TJOrlowski

    Ask for a raise

    Cry22, From your arrogant (and ignorant frankly) tone, it is understandable that you are "your own boss." If you have any employees, do you view them in the same manner as you assert that those on this fora view their employees? Or are you a divinely inspired exception to the "rule" that...
  16. TJOrlowski

    Ask for a raise

    Cry22, I feel bad for you, and also bad for anyone you work for. If I were JAE, I'd feel pretty insulted that you basically called him a liar. If I were your employer, I'd want you off my team ASAP, lest your misconception that all bosses are only interested in keeping their team members...
  17. TJOrlowski

    Tubesheet calculation when NTIW is used (ASME interpretation)

    Yes it could. It could also refer to full tube supports in the case of TEMA type "K" shells. -TJ Orlowski
  18. TJOrlowski

    Tubesheet calculation when NTIW is used (ASME interpretation)

    Shell & Tube (and specifically tubesheets) seems to be the red-headed stepchild of most (if not all) commercially developed mechanical design software packages. U-2(g) is the way to go here. Talk with your AI - he may accept designing the tubesheet(s) in accordance with TEMA, or require you to...
  19. TJOrlowski

    How do you win projects?

    Maximusprime, Welcome! There is a forum under the heading "How to Improve Myself and Get Ahead in My Work." I think this question would get much more exposure (and responses) if posted there. -TJ Orlowski
  20. TJOrlowski

    Heat exchanger vacuum breaker?

    The recommendation is correct, but the reasoning is wrong. Installing a vacuum breaker and/or air vent to the shell side of steam to liquid heat exchangers is always recommended by every major (and minor) manufacturer. The vacuum breaker/vent should be used in accordance with the type of...

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