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  1. Thread: Corrosion?

    by Drazen
    Replies
    7
    Views
    394

    ordinary leak testing should show where leaks...

    ordinary leak testing should show where leaks exist, and if there are only few detectable places, repair is possible, otherwise replacement is likely the only option.

    chemical action would not be...
  2. Replies
    15
    Views
    1,024

    if i'm in charge of supervision of this, i would...

    if i'm in charge of supervision of this, i would have stripped it out manually and ask contractor to do everything properly, from the very beginning.

    of course, it much depends on which conditions...
  3. if you hunted condensation points as you...

    if you hunted condensation points as you described, i would say that you have typical example of thermal bridges. so first what you should try out to simply insulate such spots, to prevent such low...
  4. Thread: how to find cfm

    by Drazen
    Replies
    12
    Views
    1,072

    do you mean supply air cfm for cooling?

    do you mean supply air cfm for cooling?
  5. as far as i know, expansion compensation devices...

    as far as i know, expansion compensation devices for ductwork do not exist, someone would have to devise it for you.

    your concept counters some basic principles of any sort of energy efficiency,...
  6. Replies
    11
    Views
    1,632

    much more information needed to reach...

    much more information needed to reach circumstances.

    though isuredo is sarcastic, he is right in some way, as intentional bypasses of safety equipment setups would be needed to give chance to...
  7. Replies
    7
    Views
    707

    hydraulic bumpers are usually applied with water...

    hydraulic bumpers are usually applied with water supply or lifting system, where you can have varying backpressure, and pump head is comparatively high.

    in circulation systems, however, they are...
  8. Replies
    7
    Views
    707

    as a simplified alternative: due to the fact that...

    as a simplified alternative: due to the fact that modifications of hydraulic loop would likely have to involve reconsideration of automatic control equipment, "the most primitive" yet possibly...
  9. Replies
    7
    Views
    707

    schematics you provided looks quite confusing for...

    schematics you provided looks quite confusing for me, third boiler even does not seem to have supply connection shown.

    could you make one more photo, focused on the very bottom of schematics,...
  10. Replies
    1
    Views
    356

    it's hard to say from distance, there could be...

    it's hard to say from distance, there could be different reasons for it. you can clear "lose casing" cause if you try to press casing firmly with few different powers exerted - taking care not to...
  11. Thread: fan help

    by Drazen
    Replies
    5
    Views
    453

    Such kind of repairs are tricky anyhow, while for...

    Such kind of repairs are tricky anyhow, while for smaller unit sizes it can hardly be worthy. the main issue is about how long repair will hold, similarly to repair of old car.

    Some question arise...
  12. Replies
    6
    Views
    735

    I am not sure what are you considering plate heat...

    I am not sure what are you considering plate heat exchanger, that is term used for water to water exchangers, while air heaters/coolers are mostly fin-and-tube exchangers.

    On contrary to water to...
  13. Replies
    18
    Views
    1,930

    manufacturer has available and reachable data...

    manufacturer has available and reachable data that presents maximum allowed length and provisions for elbows.
    if you are within limits, rated cooling will be reached, but, of course, that does not...
  14. i am not sure whether i can understand you. you...

    i am not sure whether i can understand you. you are interesting to hear about some other duct materials where manufacturers have ambitions to have their products approved in some way? i cannot recall...
  15. Replies
    9
    Views
    1,155

    Can you be specific: what do you want to achieve...

    Can you be specific: what do you want to achieve and what problems do you have now?
  16. Replies
    5
    Views
    1,493

    i would say that you are comparing apples with...

    i would say that you are comparing apples with onions which does not make sense.

    eer is more or less obsolete figure, and the fact that some manufacturer does not declare seer says much about that...
  17. to the best of my knowledge there is no any...

    to the best of my knowledge there is no any plastic duct material which is officially approved as adequate for supply ductwork.

    there are few manufacturers which presented their investigation, and...
  18. Replies
    6
    Views
    704

    Is those duct runs quite long? If your...

    Is those duct runs quite long?

    If your recirculating air cools down so much that it condenses on the inside, adding more insulation might be not only counter-condensation, but also counter-high...
  19. Replies
    9
    Views
    1,121

    What is usually of primary concern is temperature...

    What is usually of primary concern is temperature rating and proper data about fitting losses, many of those fittings have substantially higher dynamic losses than copper/steel, so that should be...
  20. you certainly need guidance of journeyman as many...

    you certainly need guidance of journeyman as many stated, but if you want some readings for preparation, try to find books of leo meyer, can be found in some online secondhand shops like...
  21. well, than you have good argument, but if client...

    well, than you have good argument, but if client insists on larger size, it may be sufficient that you have an ordinary e-mail sent to client where you described what you wanted.
  22. to some point i could understand your customer. ...

    to some point i could understand your customer.

    did legislation change in time between bidding and current time? if it did not, i see no purpose for asking customer to sign anything if you...
  23. Replies
    15
    Views
    1,301

    i can only guess that, as it is not intended at...

    i can only guess that, as it is not intended at all that such valve works when de-energized, gas pressure is not sufficient to open it, but in any case it looks like main safety valve.

    now that...
  24. Thread: System Leaks

    by Drazen
    Replies
    18
    Views
    1,410

    at least you know that you have to smash ceiling...

    at least you know that you have to smash ceiling :eek:

    installing refrigerant lines with joints through unapproachable area is one of the worst things i know where architects and dx systems sales...
  25. Thread: System Leaks

    by Drazen
    Replies
    18
    Views
    1,410

    you need soap to check joints one by one, finding...

    you need soap to check joints one by one, finding refrigerant leaks is tedious task more often than not.
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