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  • Users: BronYrAur
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  1. BronYrAur

    Multiple cooling Tower equalization issue

    I have 3 cooling towers with an equalizer line connecting them. I have noticed a condition when 2 of the 3 are running. I looked inside the 2 running towers and noticed that the water level was normal and that no water was being made up. I then looked in the tower that was not running and...
  2. BronYrAur

    Cavitation while running 1 pump but not 2

    I have a hot water system pumping 140 degree F water. Pumps are variable speed to maintain a pressure differential out in the system. When running only 1 pump, VFD is around 50Hz to maintain the 10 psi differential. I hear cavitation at this condition. Suction pressure is 40 psig, and...
  3. BronYrAur

    PK Boiler condensate backup

    The attached photo shows the drain at the bottom of a PK boiler with a P-trap, and the drain at the "bottom" of the flue with a loop trap. There is a collection device in the flue to allow condensate to be collected at the point where the drain is located. The boiler has decolorization on the...
  4. BronYrAur

    Steam Blowout Target

    I have been asked to install a 6" blow out line for a 250 psi steam line that will be powering a turbine. The purpose is to blow out any slag in this temporary blow off line. basically, it will be a 6" line with a gate valve that will vent outside for a couple days worth of testing. I need...
  5. BronYrAur

    Cooling tower bypass into the basin VS completely bypassing the tower

    Any thought on pros and cons of bypassing water into the tower basin (ie not up through the fill) versus completely bypassing the tower. I am specifically talking about a non-winter operation, so the tower fill would not be bypassing as a means of freeze protection. No concerns of freezing at...
  6. BronYrAur

    Removing expansion tank after system is hot

    What do you think of this one? On a hot water heating system, what if you removed the expansion tank after the system is hot? Everything has expanded and the pressure is stable. worse case, if everything gets cooled down, the pressure would drop. Auto fill would have to be isolated so as to...
  7. BronYrAur

    Stainless steel pipe for swimming pool water?

    I know that chlorine attacks stainless steel, but I see stainless steel ladders, etc in swimming pools. So I am confused. I will be installing a steam/water heat exchanger to heat pool water. The heat exchanger will be cupro-nickel and I will be piping the pool water in PVC. My concern is...
  8. BronYrAur

    R134A Relief Pipe Sizing

    I am doing a gut check on something designed by someone else. Two (2) 200-ton chillers are being installed that use R134A. Each chiller has 3 relief valves that all tie into a common header. The header is 6" pipe. That seems too large just from experience. I can't seem to find a good...
  9. BronYrAur

    Leaving Dead-Leg Chilled water lines in place

    I have a chiller replacement application where the existing unit is actually 2 chillers. The name tags identify them as "section A' and "section B" of the same unit, but they have separate piping and electrical feeds. They must have interlocking controls so that at least one compressor from...
  10. BronYrAur

    Anyone looked into these magic room AC units that only use water?

    I keep seeing ads for room air conditioners that only require you to fill them with water, and just like magic, "freezing" air comes out. They make wild claims that they save 300% on your energy bill, etc. What are these things, just evaporative coolers? Certainly that aren't absorbers...
  11. BronYrAur

    ASME piping to first valve on steam boiler discharge.

    I quite regularly see stop valves on the discharge flanges of "high pressure" (15-150 psi) steam boilers. It is my understanding that the piping between the boiler and the first valve must be ASME piping. Many mechanical contractors do not have the ASME stamp, so valves are connected directly...
  12. BronYrAur

    Boiler Efficiency speadsheet

    Anyone have a good spreadsheet or reference for determining boiler efficiency? I see many threads on the topic but haven't found a good reference or calculator. My particular situation consists of an old firetube 12psig steam boiler. Hasn't been serviced in a long time and probably runs very...
  13. BronYrAur

    Modifying a boiler system - switch to primary/secondary?

    I have run into a situation that I haven't seen before. I have been asked to make recommendations on a boiler system. The system has 10 Raypack boilers at 2,000 MBH each. The piping is weird. It looks like it may have been intended to be some form of quasi-primary/secondary with a 3-way...
  14. BronYrAur

    Need to cool water flow from 160 deg F to 60 deg F - kicking around ideas

    Hi all, I am looking for ideas on the best way to cool water from 160 deg F to 60 deg F. I have been asked to look at a situation that currently uses city water in a once-through system to cool a process. The water is then dumped. I'm trying to think of a closed-loop way to do it and thereby...
  15. BronYrAur

    Calculating ROI to Correct Poor Performing Chilled Water System

    I don't know what this designer was thinking. Please look at the attached flow diagram for a chilled water system. The chilled water flow is primary/secondary, but there are 3 decoupling bridges. Those devices (that look like the letter Y laying on its side) are just regular circuit setters...
  16. BronYrAur

    Chilled water flow issue

    I am troubleshooting a job where chillers were just replaced. As the building load satisfies and control valves close, the chillers are going off on low-flow. I suspect that I know why, but I wanted to run something past everyone. A rough drawing of the system is attached. It is a very...
  17. BronYrAur

    Oxygen Cylinder storage room exhaust

    I am confused by what I am reading in an NFPA white paper on med gas storage. See attached. The table on page 3 states that the volume of gas is needed in order to determine the ventilation requirements. In the table they show the cubic inch volume of the cylinders and the cubic feet volume...
  18. BronYrAur

    Chiller system where supply is its own complete loop and return is its own complete loop

    I am looking at some drawings of a chilled water system serving a bunch of data center CRAC units. There are a lot more CRAC units than I have shown on the attached sketch, but the gist is there. I am confused because the supply piping is a complete loop all the way around and so is the...
  19. BronYrAur

    Flow Direction Through a Pipe Union

    In my 24 years in this business, I have never heard that there is a preferred direction of flow through a pipe union. Apparently there is for certain applications (e.g. steam, high velocity, etc.) The "nut side" of the union should be the entering side. A quick Google search indicated such. I...
  20. BronYrAur

    Can a pumps suction gauge ever read below NPSHr, taking into account atmospheric pressure

    This is more of a theoretical question, but it is based on some readings I an getting. If I have a pump that requires 5.7 psi NPSHr operating at sea level (14.7 psi), the lowest I should theoretically be able to see is -9 psi on a suction gauge, correct? Anything more negative would cause...

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