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  • Users: jistre
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  1. jistre

    low temp. psychrometric questions

    I'm trying to figure out what happens to psychrometry when air gets really cold. I'm trying to get a handle on the TR required to bring air down to -65, but I have two problems. One, the ASHRAE charts only go down to -40. Two, it makes no sense to me to talk of relative humidity once air gets...
  2. jistre

    Need suggestions for load calculations for ultra cold rooms

    Hey guys, let's see if I can pick your brains. I have a project in a research facility that will have an ultra cold room serving as a research area that will be held at -65F. Yeah. I have various options in terms of refrigerants and heat sinks, and I'm trying evaluate them better, so I'm...
  3. jistre

    Carrier HAP unmet load hours

    I have a problem with HAP that I can't figure out. The version I'm running is the latest upgrade, 4.5. I am running simulations and the LEED report is showing that I have almost 2000 unmet load hours on the baseline building. The systems are packaged RTU and VAVs with hot water reheat...
  4. jistre

    Carrier HAP program and heating calculations

    I'm trying to model a system with an air source heat pump as the heating source, and am getting some results I can't make sense of. The program runs through the simulation and calculates heating coil loads, but then insists that there are no heating equipment loads. Hence, the heating...
  5. jistre

    Question about RO manufacturers

    I've been asked to investigate some large RO systems that would be for industrial use in the 250+ GPH range. I can find sources for the equipment and information all day long on the internet, but I suspect that I'm seeing some information that is for identical units that may have been licensed...
  6. jistre

    Modelling complex geometries in heat load calcs

    I want to pick some brains here and see what kinds of strategies you guys use when you are in the position I'm in now. I use a computer program to model heat loads on my projects, and when external wall exposures are input, I have the option to select 16 compass points to describe what...
  7. jistre

    Resources for nitrogen purging of a vessel for storage

    I'm currently trying to write a specification for nitrogen purging of vessels after fabrication to drive the oxygen level down to prevent corrosion. Do any of you know of some good resources that I can read that will give me a good background in setting an acceptable residual oxygen level and...
  8. jistre

    Nut & bolt locking system new to me. Your thoughts?

    http://www.tinelok.com/WhitePapers/TinelokWP.pdf I came across this in a trade magazine, and locking systems being what they are, with the multitude that simply don't work, I wanted to run this by you folks and see what you thought of this system. Pros and cons welcome here.
  9. jistre

    Question regarding Sec VIII Div 1 and closest approach welds can have

    I have a S&T HXer with a bit of a problem. I have a repad on the channel nozzles that is relatively large for the channel. The end result is that the repad welds and the girth flange welds come within 1/2" of each other. I have several solutions to the situation, but what I don't have is the...
  10. jistre

    Spectacle blinds used with brittle FF flanges

    Okay, let's pick those brains out there. I have an application where I need a spectacle blind in a plastic FRP piping line. The pipe spec calls for flanges made out of the FRP material that are flat faced and built to the dimensions of B16.5. I have a copy of B16.48 for spectacle blinds and...
  11. jistre

    Expansion joint spark testing

    I know that when dealing with things like lined pipe or lined valves, spark testing for holidays is a good idea. However, I'm looking at some PTFE bellows expansion joints and some elastomeric expansion joints. Is there any reason why you would spark test these? It seems to me that any...
  12. jistre

    Pipe stress analysis : Stress intensification factor question

    I'm running up against a problem here. I'm doing some piping stress analysis using B31.3. I was wondering if any of you knew of a place to find information regarding SIFs of dummy leg applications. Dummy leg to tee, bend, straight, etc. Any help would be much appreciated. Thanks
  13. jistre

    running macro on multiple workbooks

    I have many situations where I'm performing the same macro on 70 or 80 workbooks that are open at once. I have no problems writing the macros to do what I want in each individual workbook, but what I'd like to be able to do is put a loop around my macro so that it would automatically churn...
  14. jistre

    stainless steel question

    This is driving me crazy, as I have a good idea of what I'm looking at and cannot find any information on the numbering of this steel I'm dealing with. What I've got is a callout for A240 TP 304. I've got that the A240 is the ASTM standard for Chromium/Nickel stainless plate, and the 304 is...
  15. jistre

    changing ordinate dims displayed as chain dimensions

    I have several drawings that ordinate dimensions are suited for. However, SW insists on defaulting to showing them as chain dimensions with arrows and lines and such. I don't want this. I want ordinates to default to not show as chain dimensions, but I can't find anywhere to set this default...
  16. jistre

    trimetric view macro I'd like to share

    I have a macro I wrote that I'd like to share. It's pretty nifty in that it pulls up dialogs that let you specify precisely where you want the view to be. It allows you to specify the angles between your viewpoint and the top and right planes. Then radio buttons allow you to specify whether...
  17. jistre

    Question regarding using macros and the API for automation

    Okay, I have here what seems to be a simple task, but for the life of me, I can't make it happen, and I can't find what I'm looking for in documentation. I'm guessing I'm just too dense to find the information and make sense of it; I'm a mechanical engineer, not a software engineer. What I'm...

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