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  1. vt2012

    pump run dry

    As others have said - no. Acetic acid will remain in the suction piping, the pump itself, and the discharge piping. If you're looking for a quick way to detect when the pump stops pumping, an ammeter can sometimes be a quick and dirty way (without having to tap in to the pipe).
  2. vt2012

    anti static valves as explosion proof

    Why do you think the valve's body would be electrified or electrically charged? Is the valve automatically actuated? If so, everything should be rated for the area's electrical classification. If it is a manual valve and it is electrically bonded to its inlet/outlet piping then there is no...
  3. vt2012

    Making new nozzle in already installed vessel

    If you have a drill, it's possible. But possible is usually not the right question to ask. Without more details we don't really know if it's the right solution to your problem. For example.. is your vessel from the vendor designed as a pressure vessel? If so, adding a nozzle may be unsafe...
  4. vt2012

    Bottom vacuum high and top vacuum low in vacuum column

    Latexman is probably on to something. I used to use a highly accurate (and regularly calibrated) digital handheld manometer weekly to verify vacuum measurements from transmitters up and down a critical column. Readings from different instruments rarely matched. How is vacuum measured? If dP...
  5. vt2012

    Sizing Tank Overflow Line for Gravity Flow

    [ol 1] 4" line is correct. I ran a quick calc and req'd ID is 3.9 inches for vertical self-venting flow. Can you put the on/off valve in the horizontal section either at the top or bottom? I am concerned that the reduction in pipe size plus the valve in the vertical will disturb the annular...
  6. vt2012

    Code case 2211 avilable copy

    Code Case 2211 has been incorporated in to the code proper since 2008. If you have access to the code, see section UG-140.
  7. vt2012

    Use of diesel engine or gasoline engine driven pump for transfer of flammable / combustible liquid

    Standard practice is an electric motor properly specified and installed for the area's hazardous classification. Using a combustion engine in a hazardous area seems like a recipe for disaster. You're guaranteeing an ignition source in the area if a leak occurs.
  8. vt2012

    Steam Generating Salt Cooler - ASME Section 1 ?

    If the Salt Cooler is constructed and stamped to ASME VIII Div. 1 then the relief device needs to be per ASME VIII. In my opinion it's as simple as that. HRSGs are frequently stamped to ASME VIII, even though they are steam generators. Your other questions are more about the relief design and...
  9. vt2012

    ASME VIII exchanger on a Section IV hot water heater

    I recommended an ASME VIII valve, but the vendor furnished the skid with an ASME IV T/P relief valve. Just making sure I'm not off base.
  10. vt2012

    ASME VIII exchanger on a Section IV hot water heater

    A vendor furnished an ASME VIII heat exchanger on a hot water heating skid. Circulated water is heated by steam in the ASME VIII stamped plate and frame exchanger. Can the exchanger be protected by a Section IV T/P relief valve or does it require a valve stamped to Section VIII?
  11. vt2012

    Aqueous Ammonia Tank

    Definitely seems unusual... maybe the overflow pipe is supposed to dip in to a water seal of some kind?
  12. vt2012

    Gas to Air Volumetric Flow Rate Conversion Formula.

    API 2000 Annex D explains the derivation and ultimately simplifies an equation for an ideal gas to convert actual to standard. See equation D.37, but make sure you fall within the assumptions laid out in D.9.2.6.
  13. vt2012

    Monitoring waste water COD/TOC/load

    Would any of the TOC contributors be detectable by a pH instrument?
  14. vt2012

    Moisture content analysis - PA6

    The potential disruptions to your moisture measurement really depends on the type of instrument you are using. From a quick google it looks like the RADWAG MA 50.R is a loss-in-weight device? i.e. heat it up and see how much weight your sample loses due to evaporation of volatiles? If it is...
  15. vt2012

    Thermal Fluid (Hot Oil) Heater Recommendations

    I have had good luck with Chromalox skids.
  16. vt2012

    H2S production

    Section 4.1 of this paper might point you in the right direction: http://onlinelibrary.wiley.com/doi/10.1002/14356007.a13_467/full
  17. vt2012

    Compact Reducing Flange

    What is your question?
  18. vt2012

    Steam density with velocity

    Density is a function of temperature and pressure. You are correct that you can use your steam table to get the density based on process conditions. Velocity is only a function of flow rate and pipe size. Also - something seems off with your estimate of 200 m/s velocity. That would be...
  19. vt2012

    Calculating Vent Size for a Water Tank

    elridyeng - that rule of thumb is actually for area, not simply the pipe diameter. So for instance if you have 3" outlet, 2" inlet, and 1" drain a 4" vent would be sufficient (even though 1+2+3 !< 4 obviously, the cross sectional area of 4" is greater than the areas of 1" + 2" + 3").
  20. vt2012

    Gravity Fed System for a High Rise tower

    Your calculation of flow is giving you more of the maximum flow rate through your 150 mm pipe with only gravity flow. That will not necessarily be the actual demand from the building. I believe that number would be much lower! With a quick check of Crane - you could hope to get about 55 L/s...

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