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Recent content by tblaser

  1. tblaser

    Tips to settle sludge from wastewater

    I did not see any statement on whether this is batch or continuous. However, I would try some bench testing with the wastewater. At minimum, you will need some glassware, maybe a stirrer. If need be, you can check aditives to help the settling. Chrome-based wastes will settle slower than...
  2. tblaser

    The USA: energy self sufficiency - political myth or reality?

    JMW: So, eliminate the big cities and have us all live in villages? I am not necessarily disagreeing with you. There is something in the small-town atmosphere which did, in the past, limit some crime and other problems. How do we deal with issues such as employment, tranportation/importation...
  3. tblaser

    What is the best engineering advice you ever received?

    From an Engineering Professor in college: Do NOT trust someone else's information or design--make sure it is correct before you use it. Also from the same guy: "If you can sell water of air, you are doing good." This was stated in the 70's before bottled water or oxygen bars showed up on the...
  4. tblaser

    "Darts" in pipe

    Yes, I have. It was on the Lewis vacuum piping header. We were running a 30" compressed air header piggybacked onto the 72" vacuum piping. The piping and equipment out at Plumbrook is much more interesting.
  5. tblaser

    Dust collector to filter Outside Air

    Thanks all for your input. To QUARK: Yes, I would be interested in the spreadsheet. tmblaser@matrixti.com Again, thanks all. I will let you know if this proceeeds further in this direction.
  6. tblaser

    Dust collector to filter Outside Air

    ChasBean1 Just looking at alternatives right now. The client is not good at changing filters, so either they will create XS pressure or will be thrown away. The atmosphere is very dusty-visibly.
  7. tblaser

    Dust collector to filter Outside Air

    billygoat22 There is a mixture of cabinet mounted devices, servers, ups, etc..., as well as lights,transformers and occasional people. A large load in a little container building, mostly sensible heat.
  8. tblaser

    Dust collector to filter Outside Air

    Mini building inside of steel mill with dusty atmosphere. Anyone ever try to prefilter the air with a dust collector type device to avoid filter plugging and lack of maintenance changing filters? The building will house electronics which do not like dust. The client wants to pressurize the...
  9. tblaser

    MeOh tank cooling

    Montemayor: I agree with the nitrogen blanket. It is a good idea used frequently, employing a relief device vented to a safe location. Off the immediate subject: Forgive me if I am looking at old codes, but I read in the forward of API 650 that the maximum design pressure of API 650 tanks is...
  10. tblaser

    Vacuum pump installed in a high position can give better vacuum

    lotus7312 Vacuum inside of the pipe is not affected significantly by changes in elevation. Unless the pump is located higher in attempt to separate liquids, I do not see an advantage. Is he confusing this system with an ejector system which requires barometric leg(s)? Did you contact a...
  11. tblaser

    heat transfer - wetted perimeter vs. heated perimeter

    Per Applied Chemical Process Design by Aerstin and Street, the wetted perimeter is used for the pressure drop and the heated perimeter is used for the heat transfer using the outer circumference of the inner pipe. See page 128, Section 8.6: Double Pipe Exchangers.
  12. tblaser

    As Built Drawings vs Record Drawings

    jaymann100 (Structural) We have gone to "As recorded" to further minimize legal complications.
  13. tblaser

    Battle with Ferrous Chloride Corrosivity!!

    Dear Grovest: You did not mention the temperature and pressure. I have used teflon-lined steel for up to 40% ferric chloride (FeCl3) with good results. You are looking at exotic materials for pure metal resistance. Ferric chloride will attack most comon metals. I believe Ferrous chloride to...
  14. tblaser

    Very Important

    Bader: Many questions. Do you mean to say that the valve is immersed, as in externally wetted, in the water/sand of the sand filter? If the mud or whatever solids are indeed internal to the relief valve, have you tried any rupture discs either upstream of the relief valve or in place of the...
  15. tblaser

    Hot Tapping Sulfuric Acid Lines?

    hokie96 : I would agree with the NOT recommended. I have never hot tapped a H2SO4 line before, so I do not have the definitive answer. But, the rate of corrosion will increase due to the higher temperatures from welding -- I would be very carefull. What is the operating pressure of the line? tim
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