RLAFOUNTAIN
Novice Member
Posts:2
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| 10/01/2008 1:52 PM |
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I took the Exam Prep Class, and The class was very helpful and informative , Which help me Pass my Chief B Test, I would recomend anyone interested in a License upgrade or just starting out , in this Exciting career to get enrolled.
Thanks Sprung Training
Richard La Fountain |
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Richard |
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Matt Warren
Novice Member
Posts:4
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| 01/15/2012 6:58 PM |
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Question concerning the first night of the STS-1 class. Need to know about the two improvements to increasing the efficiency of a externally fired boiler. One was to increast the height of the stack and the other was what I am not sure on. Is it the change in the difference of the temperature from the fire to the outside temperature of the air?
The question is concerning the reference made to the 3 pass boiler. If the 3 pass boiler is the most efficient, why would 4 or 5 passes not make it more efficient?
Last question would be on the heating of water. Is it correct to say that if you heat one pint of water to steam it will increase 1600 x in volume to what it was as water?
Thanks for your time. |
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Daniel
Novice Member
Posts:4
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| 01/26/2012 11:17 PM |
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I just finished my third week of evening training and am very impressed. Thank you Sprung Services.
Dan |
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Reed
Veteran Member
Posts:458
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| 01/27/2012 12:32 AM |
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We aim to please...
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Reed Sprung
Sprung Services, Inc. |
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RBob
Intermediate Member
Posts:28
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| 01/28/2012 5:47 PM |
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Hi Matt:
Some answers for you-
Increasing the numbers of passes does allow you to extract more energy, but it also will increase the resistance to flow. Every pass you add costs money. In my understanding, it's a trade-off.
Yes, steam volume is (aobut) 1600 times water volume--at STP. ---->If you double the pressure,though, you'll half the volume.
BobH |
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Reed
Veteran Member
Posts:458
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| 01/28/2012 8:44 PM |
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On licensing exams they use different values depending upon where you live. I think there are some locations in Canada where you need to answer that question with 1,700 and then you can google it and get an answer in the mid 1600s and if you are taking an exam in MN you need to say the answer is 1,600.
Bob's answer is best, but use this info for test taking.
We need to research the multiple pass thing more. I've been told by manufacturers that more passes are more efficient until you get to too many passes and the resistance becomes too great. This generally happens after 4 passes, so a 4-pass, wetback scotch marine is normally the most efficient firetube steam boiler. We apparently have a disagreement between instructors here though (which is rare) so we need to research this and clarify. |
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Reed Sprung
Sprung Services, Inc. |
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Reed
Veteran Member
Posts:458
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| 01/29/2012 3:58 AM |
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We looked into the 3-pass vs 4-pass thing. It turns out that it has changed over time. Older boilers were limited due to design flaws that kept the flow limited and caused condensation in the final stages of the gas outlet leading to decreased efficiencies and more maintenance problems. This has since been remedied with newer technology and proper number of tubes keeping exhaust gas velocities high reducing condensation corrosion issues.
So, we will go with "more passes are better" when it comes to boiler efficiency in the future. There will still generally be a max of 4-passes for several reasons though. |
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Reed Sprung
Sprung Services, Inc. |
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Matt Warren
Novice Member
Posts:4
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| 01/29/2012 7:28 PM |
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Question 1. concerning water tube boilers. I now know that the flow from the steam drum goes to the superheater, and then to the turbine. You mentioned the reheater tubes. Are those coming from the turbine after it gives up its energy? Where does that reheat line go from there?
Question 2. I had a hard time getting the degree F and degrees C equations to match when I went back to see if they converted to each other. Found out it was a case of parenthesis in the wrong spot. I had the equation for finding F as F=9/5(C+32) when it should have been F=9/5(C) + 32. Hope everybody got that one straight.
Question 3. In the math class were were given an example of water column pressure related to height of water above the suction of the pump. I am having trouble converting units. I know that it is .433 psi for 1 ft of water. The example question asks if we had 135 ft above the suction of a fire pump, what is the psi at the suction of the fire pump. So the equation would be .433 psi x 135 ft = 58.45 (psi?). Question would be what would the units be on that 58.45 because we are multiplying psi by ft.
Thanks for your help, I enjoy the class.
Matt |
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Matt Warren
Novice Member
Posts:4
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| 01/29/2012 7:28 PM |
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Thanks Bob
Matt |
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Matt Warren
Novice Member
Posts:4
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| 01/29/2012 7:33 PM |
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Reed,
Just read your note from last week, I will post those questions on the SprungTraining.com, sorry about that, will direct my question over there.
Matt |
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Reed
Veteran Member
Posts:458
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| 01/29/2012 7:52 PM |
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Matt,
Which note from last week? Things get to be a blur after a while. You can certainly post on sprungservices.com. The only thing I encourage is that people split up their posts into separate topics so they are easier to find. If you could tell me where my note is I could look at it and try to divine what I meant.
I'll answer part of your question. The units on the .433 are not psi. They are psi/ft. The foot units cancel, leaving you with psi (technically, psig). |
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Reed Sprung
Sprung Services, Inc. |
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