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  1. pablo02

    Drill Hole in Pump Check Valves

    In line with what dave2109 stated, we use a small orifice in check valves in some limited applications to keep the water in the pipeline flowing (slightly) for freeze protection...
  2. pablo02

    Ring of bolts shearing off!

    Another item to look at is how frequently and how many times these bolts have been torqued (and how much torque is involved) -- the metallurgical analysis mentioned by artisi should point to the cause -- saxon's comments should be considered by all...
  3. pablo02

    Continuing Education for Electrical PE's

    Thanks, BJC -- have used these in the past but due to the local economy, many of these are no longer available in the near region -- but I still converse with our vendors and remind them to inform me of anything in the area (radius of 200 to 300 miles)... thanks for the response..
  4. pablo02

    Continuing Education for Electrical PE's

    Thanks, guys I have looked at those sites referenced by the licensure boards and am currently using some of those (T2G has some that is relatively inexpensive in comparison to others). {A couple of states limit on-line training, so I must tailor my CE to meet those requirements now also)...
  5. pablo02

    Gas pressure

    With all due respect,Accystan is correct -- I have used the wrong conversion factor (ounces/sq.in.) My error -- glad that Accystan was watching -- as he points out the correct factor is 1" H2O = 0.0361 psi (and my rule of thumb deals with inches Hg, not inches H2O) My apoplogies...
  6. pablo02

    Gas pressure

    I agree in concept -- I should have left off the "g", my error (or added 'wg' to my answer) -- however, the question dealt with inches water gauge which is also a measurement above atmopheric pressure therefor the value is still valid if you disregard my error in units...
  7. pablo02

    Gas pressure

    inches wg refers to inches water gauge -- and I am assuming that you mean psi (pounds per sq in) when refering to a pound of gas: use the standard formula 1" H20 = 0.5781 psi (when estimating I usually use a rule of thumb that 1" H20 is roughly equivalent to ½ psi -- recognizing that...
  8. pablo02

    Common Keying on Switchboard Locks?

    I have always seen and always used "keyed-alike" locks for such installations (I live in USA) -- in the field, we never knew ahead of time which technician, meterman, or substaion member whould be assigned to work on the equipment, and during storms, any number of people had to have...
  9. pablo02

    Pipe Tee Question

    I agree jte, the run dimensions are given first with the branch last...
  10. pablo02

    4-20mA 3-15psi ?

    I not familiar with your application but we have used split range controllers to control separate valves in power plants that will have the same ranges you refer to... as you allude to and others point out, you want the operation of these valves to be dependent upon each other, not independent...
  11. pablo02

    4-20 mA Shielding

    What did you do with the unused pair? Typically, I will also ground any unused pairs at the same end as the shield is grounded (don't know if that helps any, it's just a practice I have always done...) Don't have a lot of experience in handling the rough environment you have, so I can't...
  12. pablo02

    Air In Leakage

    After a turbine overhaul is tough -- verify that the shells had been blued and you had good surface contact before torquing the studs... make sure the steam seals are working properly, check the lead diaphram to make sure it wasn't cracked or slightly cut by the knife edges, make sure the...
  13. pablo02

    size breaker

    Breakers for motor loads are usually sized differently from other loads -- you need to know what load the breaker is serving.... As DanDel poins out the NEC specifies several procedures... take the time to review these...
  14. pablo02

    PUMP MOTOR

    I think Doug and TomG -- the motor's feet are either "ground" or machined to form a flat plane -- if you hand grind one foot, you can not maintain that same plane and shimming will not provide an even distribution on the foot and alignment will not be consistant...
  15. pablo02

    Boiler ID Fan

    As I recall, this is typical of an ID fan driven by a VFD... The VFD will start the fan and gradually come up to (as dictated by control program) speed --the motor starting current and initial air flow are significantly reduced compared to the non-VFD starting methods...
  16. pablo02

    Engineering is Going Overseas - Goodbye Jobs II

    jetmaker -- I wasn't trying chastise you; I have had this same discussion 5 years ago with those I went to High School with (baby-boomers reaching their mid-fifties) and I was laughed off the bulletin board -- I'm glad you agree with me and yes, it is not a popular sentiment, but I think it is...
  17. pablo02

    Engineering is Going Overseas - Goodbye Jobs II

    jetmaker: do you think the rest of the world will ever catch up to our standard of living? We (good ol' USA) have 15% of the world's population and yet we use 85% of the energy -- I have always believed that the standard of living was a funtion of energy use do think the world could...
  18. pablo02

    480 or 240 3 phase for new service

    Take a good look at your loads -- you'll probably be limited to 1000 kVa or smaller for (secondary) voltages less than 480/277 3 phase services... [but at that level you would probably need to consider the 480v option anyway] Consider the comments above regarding you loads, cable sizes, etc...
  19. pablo02

    I retrained to do drafting 1997 to

    Do not overlook the small engineering firms -- in some respects, they will not farm much of their work oversees, on the other side, they don't pay what the big firms "use" to pay... however, their work is more influenced by the economy and the "opportunities for a new...
  20. pablo02

    switch gear remote racking

    As dpc points out, Siemens does make a remote racking device -- this fabricated and now marketed as a result of a specific request of CLECO (I think) [Central Louisiana Electric] -- I think they even have a video of this is action...

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