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  • Users: hollerg
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  1. hollerg

    Removing inerts with steam?

    I need to change how five vessels are air-freed*. The current procedure drops the non-condensable concentration to at least 10% and perhaps, < 1%. Once cleared of non-condensables, this aqueous process operates at 200 F continuously without venting. The reactor has a partial jacket (~ 1/3" of...
  2. hollerg

    I have a compounding process that r

    I have a compounding process that releases a trace amount of 2,5-dichlorophenol CAS 583-78-8 but it has a very strong smell. I have only found an undocumented odor threshold concentration (OTC) in water. Since the odors are a strong function of structure, and vary by orders of magnitude, I...
  3. hollerg

    how does flash point relate to the out of service fuel concentration

    Our plant handles methanol and xylene and I would like your thoughts on the practices used when cleaning the tanks. They fill and drain out the water and then run a flashpoint on the residual water (~ 100 F) judging the tank is clean and air can be admitted into the tank when the flashpoint is...
  4. hollerg

    Method for rating relief requirements for a CO2 vaporizer?

    I would like advice for the blocked in case for the CO2 side of a vaporizer. The control logic will allow the steam side to reach the header steam pressure. As I understand it the blocked-in venting starts as a liquid expansion case, but as soon as the valve opens vaporization begins and heat...
  5. hollerg

    Experion Historian help requested

    Because of a start-up I am having to do things that beyond my skill set. I have no prior experience with Experion, but need to capture fast data rather than the standard historian data. The data points were already in groups. I went to the historian and took out the entries in the standard...
  6. hollerg

    Dispersion modeling &amp; buildings - To locating a rupture disk tail pipe opening, just how good is

    Please follow this link to the details and post there. http://www.eng-tips.com/viewthread.cfm?qid=389612 Thank you for your time
  7. hollerg

    Dispersion modeling and locating a rupture disk tail pipe exit

    I have a new 10" rupture disk tail pipe to route, and specified it must be above the nearest building eve by 10 feet, and if an eve was within 20 ft, I requested the line be routed up past that higher roof eve on the "penthouse". I did it to maximize dispersion, for high velocity outflows and...
  8. hollerg

    How do I determine if this component meets ASME?

    I have a component that was fabricated in Europe, which has the attached nameplate. The item is a 7"x7"x36" rectangular box on the side of a reverse pulse jet baghouse. The square tube has one longitudinal weld, corners are bends, and the ends are flat plates. The box operates at 55 psig at...
  9. hollerg

    Coupling plain bare end tubing for pneumatic conveying

    I am updating piping specifications, and haven't been able to confirm the pressure rating for compression couplings. So far a VERY frustrating search. Morris Coupling, INC, sells these two prototypical configurations these "lower pressure" couplings use 3 to 6 bolts to clamp the rubber sleeve...
  10. hollerg

    Time to fire driven relief

    I have an ASME code vessel running 85% liquid full, which fire exposure would result in the PRD lifting. The material would be just below the pseudocritical condition during the relief. Downstream there is and an undersized flare, when I compute the valve size by API-521 with the minimum...
  11. hollerg

    Are there conditions which derate Lap joint flanges?

    I have operating scenarios that could overpressure an existing 600 class flanged nickel piping system. The flanges are the weak link rated for 720 psig up to my maximum operating temperature of 500 F. I plan on replacing the RFWN with a lap joint. I would use straight grade 316 Lap Joint...
  12. hollerg

    Modeling fan capacity curve

    I tried to model a fan as an isentropic compressor in Aspen Plus. I computed adiabatic head from the manufacturers static dp Vs flow curve, then entered the head Vs suction conditions volume flow rate as tabulated data. However the results overpredict the pressure increase by 10%. Is static...
  13. hollerg

    How to compensate for asymmetric flow in a square duct?

    I am trying to establish how to install a sensor so that the installed accuracy is at least +/- 5% (would like +/-3%) in square/rectangular duct with less than the normal L/D availble. I have an FCI thermal mass meter, but would be willing to buy a new multipoint meter, if it is unlikely to work...
  14. hollerg

    Enhancing Vibration to reduce build-up

    I have an 1/8” thick Teflon rectangular plate clamped on one end as shown in the diagram. It’s inside a vibrating fluidized bed dryer. The air flow (~ 300 SCFM) and vibration make it flex and wobble which aids getting the wet granules that impact to slide off into the main bed of particles...
  15. hollerg

    keep TFE for feed plate or use?? Nyloil??, UHMWPE ?

    I have a wet filter cake that will stack up on the entrance to a fluidized/vibratory bed dryer. The falling granulated wet cake doesn’t always slide off the inclined (~25 degrees) plate into the fluidized bed. The original bright 304 plate would develop a mound the diameter of a bowling...
  16. hollerg

    Air heater underperformance

    I have a parallel 27"x27" steam heated finned air coils. One underperforms when the flow rate is shifted to that unit. It may be inerts or poor quality (wet) steam. However my duct work may be skewing the flow profile too Short of CFD modeling, anyone know of a paper on duct flow...
  17. hollerg

    Orifice plate thickness &amp; design dp

    What is the downside to taking a high pressure drop for a liquid flow meter orifice, so long as I ensure there would be no flashing, accept a small beta ratio, to avoid using a throttling valve? I imagine the orifice edge blunting is more rapid. If I were to take 50 psi drop would it be best...
  18. hollerg

    FRP fan question

    I need a fan with operating conditions that are a poor match for NYB blowers made of FRP. Any suggestions for alternative suppliers? I need 30 "wc total developed head @ 700 to 1000 AcFM througput. So far what I have found is either too low a boost or the fans are oversized. Gary
  19. hollerg

    Whta type &amp; design of K/O upstream recommended for Fume incinerator

    I am specifying a K/O pot-->deflagration arrester-->Fume incinerator. Upstream is a 500 ft line from a dilute caustic scrubber. Condensation in the transfer line is likely. What design for the K/O to request, like for a flare >300 micron, or <10? W/ the downstream DA acting as a chevron...
  20. hollerg

    batch heat transfer question

    Kern's book on Heat Transfer shows computing the time to cool a tank using an external cooler, but it does not account for a concurrent heat source. I have seen, but can't recall an alternative method (Max Jakob? or Carslaw and Jaeger?) which accounts for a constant energy load added...

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