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  1. Fizzhead

    Strength of Cement-Treated Aggregate

    Stuus: I worked building the new airport in Athens Greece in the late 1990s and we used a lot of CTB under concrete for aprons, taxiways and runways. In Athens, we have not observed any problems with differential shrinkage or cracking at all. Strength was roughly the same as you described...
  2. Fizzhead

    Cathodic Protection for water pipeline

    WaterGIS: The answer to your question is "Yes, most likely there will be some effect." It is possible, but not likely, that there is no effect. The person/company doing the gas line cathodic protection study and design should take this into account and at the least, provide you with...
  3. Fizzhead

    Halar/ECTFE Minimum Explosible Concentration

    DonyWane: Sorry for the delay. Had to relocate my office and have been out of touch lately. Anyway, to answer your question. Yes, the idea of the 3D type modeling was to look at the concentration profile so that once you had an MEC identified, you could identify when you reached it and when...
  4. Fizzhead

    Deaeration/02 removal, Can Mechanical remove 100%

    BigDog50: Well, you are right and then again not quite so right. By raising the temperature of the water, you can indeed drive off what would be "chemical oxygen" (i.e., dissolved oxygen), but only to a certain extent. As long as air is still present inside the DA, the air and water will try...
  5. Fizzhead

    Gas spray cooling temperature control

    kpar: Biggest variable here is the type of nozzle you and use, the pressure drop across it and the nozzle arrangement (i.e., whether or not you have a hose stuck into the side of the duct, or a bank of fog nozzles. However at those temperatures, it won't take long to flash off the water...
  6. Fizzhead

    Jet Fuel Bulk Storage

    FredGarvin: I have built several jet fuel reception, storage, treatment and distribution systems for airports and have never encountered a problem with short term stratification of fuels. We follow guidelines that prohibit usage of fuel that has sat in storage (in-pipe or in-tank) over 30 days...
  7. Fizzhead

    flue gas temperature

    Kagadpencil: The question you ask disregards some vital elements. The configuration of the oven, stack, etc. and the process. What type of process are you talking about. Combustion of natural gas to produce heat for what purpose? Are you baking bread? Or curing carbon fiber materials...
  8. Fizzhead

    What does "safe" mean to you?

    How safe is safe? How red is red? Obviously something one cannot specifically define in any legal document or engineering guideline. What I accept as safe (say driving 90 on the interstate) may be perceived as horrifyingly risky to another. And that person's perception can and does change...
  9. Fizzhead

    Differential Head

    Td2K: I am a little confused by your statements. First you say that Head should not be affected by density and then quote the GPSA data book for a Head equation that shows an inverse relationship between head and S.G. Have I forgotten something from school? Please clarify.
  10. Fizzhead

    [B]Pump Specification 600GPM

    traindriver: I also would stress what tickle has said. Especially when talking about the jet fuel as there are aviation industry standards for system designs that reach all the way from the aircraft to the refinery and specifically exclude any use of copper, or copper alloys, in Jet A storage...
  11. Fizzhead

    Differential Head

    Milkboy: Differential Head is the pressure differential created by the pump under a given set of conditions with a reference fluid and is independent of the absolute pressure of the environment in which the pump operates. That is, the pump could be extracting fluid from a pressurized source...
  12. Fizzhead

    Where does the rubber go?

    25362: Great response. I can't imagine what else one might want in the way of knowledge on this subject. One big star for you buddy. Great job!
  13. Fizzhead

    "breathing" valve for ammonia tank

    csaba: What you are looking for is normally called a P/V breather valve and these are commonly available. However, be careful to match the P/V range to your tank design. I note that you do not describe a "third phase" in which water is added to the tank. I assume you must do that...
  14. Fizzhead

    CO2 Removal from Plant Stacks

    Gentlemen: All the ideas above have been interesting. However, I would like to point out that you have ignored the largest carbon respository on our planet, the oceans. Take a look at ocean water chemistry (not deep sequestration as was mentioned above) and you'll see that the worlds oceans...
  15. Fizzhead

    Hydraulic/Environmental Data -- How do YOU get it?

    cah20eng: Have encountered this problem before when working for an international consulting company. We started out analyzing data available from the government, demonstrated to the client the variability of the data and then set up our own testing stations and got improved data. This was the...
  16. Fizzhead

    Standard & Normal Conditions

    MaNaTMoS: "Normal conditions" as I have been given to understand it, is the continental way to say "standard conditions". Standard conditions are defined conditions depending upon the system of units you utilize. That is to say, that in the English system they are different than in either the...
  17. Fizzhead

    Halar/ECTFE Minimum Explosible Concentration

    DonyWane: Finding the MEC could be difficult. Dust explosions are an inexact science. I will do some looking and let you what I can find. In the mean time, yes the manufacturer should be able to give you the spray pattern characteristics. After that you will have to calculate the exact...
  18. Fizzhead

    conversion mg/Nm3 to PPM

    yulinios: One thing to clarify here. The analyzer indicates +/- 1,200 mg/Nm3. This is at standard conditions and the temperature and pressure conditions cited are merely the characterization of the environment the analyzer is sampling. I believe this is part of what 25362 means by his last...
  19. Fizzhead

    Where does the rubber go?

    Owg: Interesting question. IRstuff has a very good point. Much of that rubber does indeed become a component of roadside dust which is eventually washed into virtually every corner of our environment. I'm not sure what you mean by "carbon dust", but I assume you mean the remnants of the...
  20. Fizzhead

    Halar/ECTFE Minimum Explosible Concentration

    DonyWane: I think that 25362 gives you a pretty good lead there concerning the combustibility of Halar/ECTFE. I would expect that if you have a potential problem here, it is not the combustibility of the product, but the potential for dust explosions that you are worried about here. From an...

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