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  1. Mark31

    Excel Scroll Bar

    Is there a way to reset the vertical scroll bar in excel so that it is calibrated to the information on the sheet rather than what used to be on the sheet?
  2. Mark31

    grate area

    2.9MW/m2 for grate area and 200kw/m3 for furnace volume
  3. Mark31

    PERFORMANCE CALCULATION

    I agree with johnnymist2003, you need to be a little more specific. If you are looking at performance, you should probably check out ASME PTC4 and PTC4.1. This will give you all you need to complete a boiler performance test.
  4. Mark31

    Running a macro from an "IF" statement

    Hey....STTTTOOOPPPPPP I figured it out about 2 months ago...thanks to everyone for your comments
  5. Mark31

    Wood firing

    I don't understand your point. The first stage of the combustion process for biomass fuels, is to evap. moisture. The excess air requirements are a function of flame stability and unburnt carbon loss. Excess air also affects the production of CO and NOx. Experiance tells us that the excess...
  6. Mark31

    Wood firing

    How do you liberate oxygen by evaporating moisture????? I dont think your buddy knows what he is talking about.
  7. Mark31

    Has anyone built a Pressure Vessel out of Aluminum ?

    You should go and talk to Coke. I crack open a little aluminium pressure vessel almost every day!..HAHA
  8. Mark31

    Wood firing

    Ideally, you should aim at increasing the combustion air temperature rather than injecting more air. Higher moisture in the fuel and more combustion air reduces your boiler efficiency. I could go on about the combustion process and why hot air is better than more air, but I think you get the idea.
  9. Mark31

    SNCR

    Can anyone tell me where UREA injection is located for NOx comtrol on a bi-drum boiler?
  10. Mark31

    Running a macro from an "IF" statement

    I would be grateful if someone could let me know how to run a macro from an "IF" statment. I guess I am really after the syntax.... =if(a1>b1,run macro1,run macro2) what do I need to replace "run macro" with to make it work? thanks....
  11. Mark31

    Pressure situation

    This question is way too silly and must be a uni assignment. Only a uni lecturer could have dreamed this one up! Haha
  12. Mark31

    Boiler Efficiency

    Alf, Have you experiance with SCAH credits or do you just want to see if I have made a mistake? The calculations are done by my boiler simulation program, there is no error in the calculation. There must be a reason why increasing the reference temperature doesnt work. Essentially, the heat...
  13. Mark31

    Boiler Efficiency

    This one should separate the men from the boys..... When calculating boiler efficiency (chemical heat or fuel efficiency), you can account for a steam coil airheater by either adding a credit to the loss account or by increasing the reference temperature. Both make sense except they give...
  14. Mark31

    CE Canada "MU" Boiler

    Does anyone have experiance with a CE Canada designed "MU" boiler firing oil or gas? I am interested to see if it performs as designed or if it struggles to make steam temperature. Thanks
  15. Mark31

    What is "back pressure"?

    I agree with vesselguy. I have ordered a few safety valves in my time. What about a back-pressure turbine? Dont they exist? If you are confused about back-pressure and dont think it exists, I think you should get out more. Perhaps it is a term misused rather than a term that doesnt exist.
  16. Mark31

    Allowable Chlorides in Cooling Tower Circulating Water

    mcguire....I am still confused. The cooling tower number is HIGHER (allow.=750ppm) than the SS suppliers number (allow.=250ppm). This would suggest that the cooling tower supplier knows more about SS in chloride rich environments than the material supplier. And yes, this is very scary.
  17. Mark31

    Steam piping expansion compensator

    I agree with CRG, expansion joints in piping are bad news. Any torsion and they are likely to fail. My experiance with them is on steam piping. I understand your application is a little different but an expansion loop in the piping is simple and inexpensive.
  18. Mark31

    Allowable Chlorine levels at high temp for stainless

    Thanks again Rusty, Do you know if the references you gave me above have a website?
  19. Mark31

    Allowable Chlorides in Cooling Tower Circulating Water

    I think my question has been lost to a discussion on TIG welding? Cooling tower suppliers nominate an allowable chloride level of 750ppm. I assume this is due to experiance with the material and using TIG welds. SS suppliers quote a figure which is much lower. The question is...Why?
  20. Mark31

    Allowable Chlorides in Cooling Tower Circulating Water

    Cooling Tower suppliers nominate an allowable chloride level of approx. 750ppm (50C, pH=6-8) for circulating water. Corrosion resistance tables nominate a chloride level of approx. 150 to 250ppm for aqueous solutions in contact with 316 SS. Can anyone tell me why there is such a discrepancy...

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