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  1. Replies
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    Just fyi guys, NFPA70E (arc flash protection) is...

    Just fyi guys, NFPA70E (arc flash protection) is industry wide, not just limited to Trane. If you are working on energized equipment, you should be wearing FR clothing, high voltage gloves, face...
  2. Can never have too many!

    Can never have too many!
  3. Yes, and removing those grains of moisture is...

    Yes, and removing those grains of moisture is where your latent load is. The air entering the coil could be 55%RH, and the air leaving the coil is at 100%RH. Of course we know this does not mean that...
  4. You have really got to stop replying like that....

    You have really got to stop replying like that. You are making me work way too hard to reply to all your little points.

    "no, total heat = latent + sensible. SHR typical runs 70-75% sensible. you...
  5. Latent heat removal takes energy and an increase...

    Latent heat removal takes energy and an increase in %RH (or dew-point, however you prefer to think of it - I prefer to think of it in terms of dew-point since we are referring to the condensation...
  6. This is what I meant to reply with. Ok,...

    This is what I meant to reply with.



    Ok, and this is basically impossible in the field with air conditioning equipment, so I guess I should have just left that part out as it's irrelevant to...
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    Be careful. Some times there is nothing...

    Be careful. Some times there is nothing underneath that side of the curb adapter other than air, and the only thing keeping you from a fall is a piece of 18 or 20 ga. sheetmetal that was only built...
  8. If you increased the pressure differential in the...

    If you increased the pressure differential in the system, without increasing the cooling load, and forced more saturated refrigerant through the coil, what would happen to the saturation temp of the...
  9. I've never seen a btu/pressure relationship chart...

    I've never seen a btu/pressure relationship chart either. I don't know that it would be possible to make one that would be useful, it would have to be system specific. The saturation temp of the coil...
  10. There is no rule of thumb that I am aware of....

    There is no rule of thumb that I am aware of. Each system is different and should be evaluated point by point. The evaporator saturation temp will vary greatly based on the dewpoint of the air...
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    Which one of us has an imaginary friend again?

    Which one of us has an imaginary friend again?
  12. Replies
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    http://i1179.photobucket.com/albums/x400/robmat813...

    http://i1179.photobucket.com/albums/x400/robmat813/former%20fetus.gif
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    It's not much more of a stretch than comparing...

    It's not much more of a stretch than comparing that to a fully grown adult. I think flies and mice actually have more of a right to life than humans do, since we go around killing each other for fun....
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    Well, if we're going to call the surgical...

    Well, if we're going to call the surgical extraction of a fetus "murder", and then make a logical leap by comparing it to gassing or enslaving millions of people, why stop there? Are mousetraps and...
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    I'm not confused, I think you are the confused...

    I'm not confused, I think you are the confused one. I think you are missing the point, perhaps intentionally.

    I said abortion is horrific, I never said it was murder. I think calling it murder is...
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    I don't pump them into a vacuum, but yes, you can...

    I don't pump them into a vacuum, but yes, you can pump down a scroll without damaging it.
  17. Replies
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    Abortion is a horrific thing, sure. If you don't...

    Abortion is a horrific thing, sure. If you don't like it, don't get one. I'm pretty sure murder is already illegal, but it doesn't stop all murders from occurring. What this argument is really about...
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    Terminating a pregnancy shouldn't be the first...

    Terminating a pregnancy shouldn't be the first solution for an unwanted child, but it is a decision that should be mutually agreed upon between the person carrying the child and the medical...
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    Don't use the black 520 adhesive, that stuff...

    Don't use the black 520 adhesive, that stuff takes way too long to dry. You will be there waiting for the pieces to dry so you can stick them together. The yellow 320 adhesive is the best. Also use a...
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    That is a nice piece! Lucky you! All of the...

    That is a nice piece! Lucky you!

    All of the Army SF guys and some of the SEALs I have met and discussed equipment with have told me they carry 1911s on deployment, despite what all of the...
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    Springfield XD service model 9MM, usually just...

    Springfield XD service model 9MM, usually just tucked inside the waist of my pants under my shirt. The gun stays put, it has multiple levels of safeties, so I am not worried about accidental...
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    That stuff is worthless. I cringe whenever I see...

    That stuff is worthless. I cringe whenever I see it.
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    The citizens of Europe and Scandinavia are...

    The citizens of Europe and Scandinavia are beginning to awaken to the dangers that a massive influx of muslim invaders from the third world pose to civilized society...

    Even as their governments...
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    I am definitely going to price out some larger...

    I am definitely going to price out some larger custom hoses in 5/8" and 3/4". The intake on most of our pumps is 5/8" and the charging valves are usually 3/4", so maybe I'll do two different sizes on...
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    :worthless:

    :worthless:
  26. Replies
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    500 microns is the equivalent of .0006 of one...

    500 microns is the equivalent of .0006 of one atmosphere and the highest grade scientific vacuum pumps can pull to one trillionth of one atmosphere, so yes, there is still air in the system. You are...
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    I think you are confusing air with internal...

    I think you are confusing air with internal volume. If you evacuate all of the air out of the tank, it is a vacuous void of nothing. There is very little air left in that tank, what little bit is...
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    I say, If you are saying what I think you are...

    I say, If you are saying what I think you are saying, then we are saying the same thing, I think.

    In a deep vacuum (read: smaller differential pressure between system and intake of vacuum pump), a...
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    So the constant 520 represents what? The pressure...

    So the constant 520 represents what? The pressure at the intake port of a vacuum pump?
  30. Replies
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    I don't claim to know everything about this...

    I don't claim to know everything about this stuff, but the sources you posted on CFM at atmospheric pressure versus deep vacuum are in direct conflict with the sources I have read. This leads me to...
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    Conductance of a 6' long 1/2" hose is 5.416 at...

    Conductance of a 6' long 1/2" hose is 5.416 at 1000 microns. The conductance of a 5/8" hose at the same level is 13.2.

    Wow, more than double. Very interesting. What I'd like to know is what does...
  32. JFK said "those who make peaceful revolution...

    JFK said "those who make peaceful revolution impossible, will make violent revolution inevitable"
  33. Thread: Work shirts

    by Tech Rob
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    Folks who work with tools for a living, fixing...

    Folks who work with tools for a living, fixing stuff, don't have lobbyists in D.C. to write the rules the way they like them.
  34. Thread: Work shirts

    by Tech Rob
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    All of these safety rules and all of this safety...

    All of these safety rules and all of this safety gear is so the company can wash their hands of the matter if you get hurt and say "Well, we gave him all of the proper tools & training, but he still...
  35. Thread: Work shirts

    by Tech Rob
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    We're in full long sleeve FR uniforms year round....

    We're in full long sleeve FR uniforms year round. It's not that bad, even on the hot & humid Florida rooftops in the summertime, until you start putting on all of the extra "arc flash" crap like the...
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    I don't want to derail the thread, but I'll just...

    I don't want to derail the thread, but I'll just say that my understanding differs from yours.
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    It's pulled down relatively dry 500 ton chillers...

    It's pulled down relatively dry 500 ton chillers in a matter of hours. 1/2" hose directly from the pump to the system. I don't use any kind of manifold. The pump seems to do its job just fine, but...
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    I got a new J/B Platinum 7 CFM last year and it...

    I got a new J/B Platinum 7 CFM last year and it has always performed well as far as microns/time goes. It feels like quality, with very little cheap plastic. It is also made (assembled?) in the USA....
  39. Thread: Average wage

    by Tech Rob
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    If you have 11 years experience in the area &...

    If you have 11 years experience in the area & trade, you should already know what the average is
  40. Replies
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    Of course it's nothing personal, and that's very...

    Of course it's nothing personal, and that's very interesting. I don't know where/what Stone Mountain is, but I'm not sure that it matters. I can't offer an explanation for what was reported.
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    My wife and I just visited GA, NC, and TN on...

    My wife and I just visited GA, NC, and TN on vacation. Seeing the number of confederate flags on display, I wondered how any black person could not be infuriated by seeing it every day. That flag has...
  42. Maybe he was secretly a conservative who was...

    Maybe he was secretly a conservative who was trying to show us the failure of socialism. :p
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    Door says "Family Dollar" Figures... I...

    Door says "Family Dollar"

    Figures... I wouldn't touch it. It looks like half of the curb adapter is hanging off the roof, too? The installing company should have ordered that thing side...
  44. Thread: Rouge cops.

    by Tech Rob
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    6,512

    Here's something to think on. 87% of the nation's...

    Here's something to think on. 87% of the nation's police departments have 25 or fewer employees. Many times, they do not have dedicated internal affairs investigators, so in cases where an officer is...
  45. I guarantee it'll end up costing about twice what...

    I guarantee it'll end up costing about twice what they budget for it, too.
  46. Thread: Hilmore ad

    by Tech Rob
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    Same here.

    Same here.
  47. Legitimate commands or not, Glenn, I can think of...

    Legitimate commands or not, Glenn, I can think of NO exchange of mere words between two people that would justify one shooting the other in the head.

    Shouldn't cops be able to handle resistance...
  48. Thread: Rouge cops.

    by Tech Rob
    Replies
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    6,512

    So when we give a nice, friendly sounding name...

    So when we give a nice, friendly sounding name like "professional courtesy" to institutionalized corruption, all of the cops engaged in institutionalized corruption become the "good cops" we hear so...
  49. Thread: Rouge cops.

    by Tech Rob
    Replies
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    6,512

    Don't allow the traditional ARP name-calling to...

    Don't allow the traditional ARP name-calling to derail the discussion. It is a non-partisan problem. Every politician that has held office since Nixon has escalated the militarization of police and...
  50. Thread: Rouge cops.

    by Tech Rob
    Replies
    388
    Views
    6,512

    I don't buy all that "only the best among us...

    I don't buy all that "only the best among us become cops" sanctimonious drivel. I think there are lots of mediocre people out there all sporting a costume, badge, and gun, empowered by the system and...
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