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  • Users: bethw
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  1. bethw

    flow rate through an orifice for boiler blowdown

    Okay, okay, I give up, I can't seem to locate my chart or formula for the rate of flow through an orifice. It's in our continous blowdown line, the delta P is 90 lbs and the orifice size is 3/8". Can anyone help jog my memory?
  2. bethw

    Polymer boiler water treatment program

    We use a polymer based boiler water treatment program here where I work. I have had only phosphate programs where I've been before, and the blowdowns there were constant to remove sludge, solids, etc. Now with this program, since from what I understand maintains things in solution (and that's...
  3. bethw

    Salt slippage

    We have a water softening system here in our plant that consists of 3 tanks. They are sold by Braswell. This system is about a year old and has run well until about 3 months ago when each of the tanks started to slip sodium. It has been cycling up in the boilers. The amount of slippage in...
  4. bethw

    Steam per cubic ft of natural gas

    We have firetube boilers here and crunching the numbers, I arrive at 10lbs steam produced per ft3 of gas. Is this number in the ballpark based on other peoples experience? I'm using this to emphisize effeciency numbers on each boiler. We are running in the low 80's.
  5. bethw

    Deaerator temperature

    Our plant has a DA that is maintained at 5 lbs. It is supplied by steam from a prv. The steam pressure before the prv is 85 lbs. If I remember my basic thermo right, because this steam comes through a prv, it is superheated when it is reduced to the 5 lbs. Using what I remember about the...
  6. bethw

    Vent valves

    I've come across a situation in a hospital where the newly installed boilers are not fitted with any type of valving on top for venting. The riser pipes are there but they are capped. Venting is now being done with a small petcock on top of each sight glass. They are now faced with the task of...
  7. bethw

    Effect of temp. on phosphate readings

    Being Mechanical and not so chemical, I am not sure of this: What effect does sample temperature have on our boiler water phosphate sample tests? Our local operators say temperature does have a bearing on the result. And how about a silica test? I am designing a cooling system for the water...
  8. bethw

    Demin regen problem

    Our plant has two demin trains, anion and cation type. Beads are 1 year old in one unit and 2 months old in the other. When we regen our units, we measure the SiO2 in the effluent to determine if the regen has been successful. Recently, we have had trouble with our regens in regards to getting...
  9. bethw

    Chlorine affecting regen beads

    Our water treatment people tell us that the chlorine in our city water that supplys our demins (cation, anion units) is killing our newly installed beads. What will chlorine do to these beads? Beth
  10. bethw

    Sodium Leakage in Demin water

    We are having sodium leakage problems in our Demin trains and I am looking for an explanation of this can anyone give me some insite into this?
  11. bethw

    Isokinetic sampling nozzles

    I saw a thread on Isokinetic sampling nozzles and there have been references to one in our plant, can someone explain why one of these is used?
  12. bethw

    Motor Power Consumption

    How do I calculate the power used for a three phase motor running at 575 volts and drawing an average of 575 amps? This is for the arguement of running an electric feedpump motor vs running a turbine feedpump and sending the power out the door. We know how much steam the turbine uses, we need...
  13. bethw

    DA questions

    What effect would changing the pressure within a dearator have on the operation of it? We presently run at approx 20psig and up to 50 at times. Also what effect would the temp. of the makeup have on the steam usage and/or operation of the same dearator? Makeup is only about 1-2% of cond...
  14. bethw

    Pipe Tee Question

    An occasion came up with our subcontractor concerning the listing of pipe tee sizes on a manifest. Just what is the right way to list pipe tee sizes on a spec sheet? We say it is listed starting with inlet size then the size of the branch (tee) then the outlet size. They disagree, saying it...
  15. bethw

    Couplings

    Could someone explain what a "dental" type mechanical coupling is?
  16. bethw

    gas turbine vibration

    When up to operating speed, what might cause a gas turbine to vibrate slightly even though the rotor is balanced? I'm not talking excessive here, just enough to draw a small crowd.
  17. bethw

    reinforcing welds

    What does the term "reinforcing a weld" mean when used in boiler work?
  18. bethw

    Turbine Rotor question

    What do the terms "rotor long" and "rotor short" mean as it relates to a turbo-generator?
  19. bethw

    Locked up stresses

    What is meant by the term, "locked-up stresses" as it relates to welding?

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