Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: john1
  • Order by date
  1. john1

    Discussion of 1.08 CFM Delta T

    AaaRRggghhh....My apologies MintJulep (sometimes you have to club me in the head 2, 3, 4.. times). I got 20 feet per second stuck in my head when doing the calculation instead of feet per minute. Ok, everybody on the boards give one more shake of the head.
  2. john1

    Discussion of 1.08 CFM Delta T

    Not really needing an algebra check (other than not being able to type the correct units). Agreed that 20 ft/sec isn't that fast, but I guess that depends on what you base fast on. Still for this situation, an "amount" of air will move through the building in less than a second. Once the...
  3. john1

    Discussion of 1.08 CFM Delta T

    All, I was hoping to have a discussion / direction on applying q=1.08 CFM delta T. I have a pump room that is 10' high, 13.3' wide and 14.8' long. Equipment is providing heat gain to the space of 52,480 Btu/hr and I am using a wall exhaust fan and intake louver. I have traditional designed...
  4. john1

    standards for electrical and mechanical rooms

    I am trying to find out if there is any specific standard pertaining to the air conditioning and/or ventilation requirements for mcc (electrical) rooms and hyraulic rooms. What is the standard? Where do I find it? etc.... thanks john1
  5. john1

    ventilation mcc rooms

    What is (or is there a) standard ventilation requirement for mcc (electrical) and hydraulic rooms? Where can I find the specific standard? thanks john1
  6. john1

    Switch mode power supplies

    Hi lyledunn, They shouldn't really. How is it arranged? If its fed from a battery, sometimes the low voltage return is the same connection as earth. If thats the case then the earth return may include part of the battery current, have a look at the layout if thats the prob, then you could...
  7. john1

    intrimsically safe circuit, max volts, max amps on safe side.

    Hi Don01, (from John1) Yes you're right, I was on about various causes of ignition, and the various precautions that are often taken with this in mind. And you are of course quite correct about the energy content is the factor, not the voltage or the current. And you're right that this subject...
  8. john1

    intrimsically safe circuit, max volts, max amps on safe side.

    Hi EELV, Your question had me going for a while. It's the equipment that can be intrinsically safe, the circuit can be what it likes. The term 'intrinsically safe' is usually used in conjunction with a description of the environment where the equipment is intended for use. In some places...
  9. john1

    Where to get copies of Material Specs Online?

    Pl. communicate on following. In case of SS 304L plasma welding , is it possble to do the welding in inert atmosphere to avoid oxidation which further helps for corrosion.

Part and Inventory Search

Back
Top