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  1. Roktgr

    Return Line on AHU - Purpose?

    Ah, makes sense. Hadn't considered that. Thanks!
  2. Roktgr

    Return Line on AHU - Purpose?

    Hello, I had a question from my HVAC mechanic in regards to the plumbing on 5 of our air handler units. I am not very experienced with HVAC systems yet and from what I can tell the line in question serves no purpose. The line in question is the one that bypasses the coil and would allow...
  3. Roktgr

    Multimeter Options for Biomed Testing

    I'm not sure right now what measurement it may need. I've only used the basic meters in the past and I'm having the feeling one of those "won't know you need it until you have it" situations. A couple of biomeds I have spoken with recommended the Fluke 87v so I guess whatever the equivalent...
  4. Roktgr

    Multimeter Options for Biomed Testing

    I need to purchase a digital multimeter for our biomed department and running up against a wall in finding information and reviews on various ones. It seem the Fluke 87-V (or 5) is very popular. Are they any others worth looking at or just use the Fluke? Saw some with a OLED screen but the...
  5. Roktgr

    Remote telemetry for watertower level control

    any suggestions on a brand or size of solar panel for such a system? The ones I have listed on my spec template are no longer in production and I'm not sure the companies are in business either. It will be used to charge a battery that powers the transmitter.
  6. Roktgr

    Remote telemetry for watertower level control

    US, there should be no problem getting good hardware, just needed some feedback on the systems before we proceed. Thanks
  7. Roktgr

    Remote telemetry for watertower level control

    Hello, We are looking to redo our current water-tower water level controls. Our current controls have numerous issues both in the communications and the wiring. Rather then run new communication wires (very old facility and not easy to run wiring) I would like to use a remote telemetry...
  8. Roktgr

    Safety wire?

    Hi guys, Recently someone mentioned the need of using safety wire on bolts someone had on a application that keep coming loose and shearing. I said safety wire doesn't keep the bolts from loosening just from completely falling out once they loosen. To this I got several people give me blank...
  9. Roktgr

    Lightning and Surge Protection for HVAC Equip?

    Free advise huh so what is the purpose of Eng-tips? I only asked for places to find information, if someone wanted to make suggestions that was fine but was not what I primarily asked for. We have a project to have a local company do an evaluation of our system and provide a report of...
  10. Roktgr

    Lightning and Surge Protection for HVAC Equip?

    Hello, I work at a small hospital and am looking for some information on surge and lightning protection. Bit of background, last summer we had one confirmed and possible one other, unconfirmed, lighting strikes to the hospital building. It damaged a number of HVAC control boards and several...
  11. Roktgr

    Instant Center position of Three Link for Off-road use.

    Here are some rough numbers: CG 28" Wheelbase 101" Setup as is IC X axis: 47.38" IC Z axis: 135.56" ~AS%: 129 Raised Lower Axle Mount 0.75" IC X axis: 116.29" IC Z axis: 491.63" ~AS%: 87 Raised Lower Axle Mount 0.9" IC X axis: 254.13" IC Z axis: 1203.75" ~AS%: 78 Raised Lower Axle Mount...
  12. Roktgr

    Instant Center position of Three Link for Off-road use.

    Hi, What I have is a Jeep with a lifted suspension and stock control arm mounting points. It is a three link with a panhard bar. Suspension works great for most everything except when trying to climb a ledge. Due to the Factory designed short arm and mounting points the front suspension...
  13. Roktgr

    Surge and Lighting protection

    Yep thats being done, started getting it setup now. Sucks having equipment that you don't know anything about.
  14. Roktgr

    Surge and Lighting protection

    They replaced all three. The fuses are on the last pole before the lines drop into the transformers. They also upgraded the fuses I believe on the primary transformer. The transformer is a 100KVA. There has not been an equipment replaced in probably the last ten years or more. The power...
  15. Roktgr

    Surge and Lighting protection

    Hi, I'm a new mechanical engineer working at a hospital facility. Recently we had two large power failures that reviled the hospitals power system is very exposed to damage from electrical surges and lightning. Our system has one three phase source as of now that comes into a set of...
  16. Roktgr

    Boilers in series or parallel

    Thanks for the info, I'm familiar with economizers and either way we go they will have economizers. As for the two 50hp vs one 100hp that may come down to cost. The single boiler was priced at 98k and the dual 50 at 146k. I'm not sure we can justify the extra 46k. As for redundancy we will...
  17. Roktgr

    Boilers in series or parallel

    I understand the preheat but thats not quite the setup we were looking at. The water does have a preheat prior to entering the steam boiler now, and I will read through the other forum. I wasn't sure where to post this. It's looking like we will just replace the boiler with a similar sized...
  18. Roktgr

    Boilers in series or parallel

    Thanks, I will check them out. I'm referring to the boiler HP cause I don't know any better. Most of the boiler manf. list their boiler in HP rating which is the BTU output, correct? Our boiler was installed in 1993 and has a design efficiency of 80%, so in to determine if we would replace...
  19. Roktgr

    Boilers in series or parallel

    Yes he's a civil engineer, but he also has quite a few other degree's and I think it's gone to his head. He is the facility manager at a hospital. He also tends to complicate the crap out of everything, he speaks very elaborately, using every 100 dollar word he can find. He tends to confuse...
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