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  • Users: RaRo
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  1. RaRo

    Differences between PVZV and PVV

    Using my local nomenclature, the Z would indicate a critical and piloted safety function of the valve. So a motorized PVV with a safety role. Which would make it a pressure control valve and not a (purely mechanical) pvv. However there are as many nomenclatures as they are sites. It may just...
  2. RaRo

    Time to fire driven relief

    The European PED, so far as I understand it, does not require the systematice relief devices. It just gives some requirements if you fit one. The basis of safety is left to the user. If you are not handling any flammable/reactive materials, you can rely purely on having design pressures (MAWP)...
  3. RaRo

    Time to fire driven relief

    ...have the heat absorbed by the liquid from API521, do not use any additional transfer coefficient/DTLM (minor impact but conservative) t heat-up= M*cm*(t2-t1)/Q ; if thermal expansion is significant, break down the calculation to consider the wetted area change (and so the Q change) over time...
  4. RaRo

    Gas-Liquid transport in ducts

    ...phase: 3.36m/s Fictitious velocity in liquid phase: 0.36m/s Supposing a homogenous mixture without any interaction, the velocity in your pipe would be 3.73m/s But this inquiry should not get any reply. With the data given, the answer will always be V=Q/(PI()/4*DI^2) in any homogenous unity...
  5. RaRo

    API 521: Sum of fire areas for vessels..Sum duties or areas..

    The ^0.82 in API 521 is there to account for incomplete flame impigement on the vessel wall. Depending on the layout and geometries, you may have to challenge that ^0.82 (e.g. take ^1 for small cross-section vertical equipments) So inherently, method 1 is the way to write it down.
  6. RaRo

    Pressure Vessel Replacement Work Flow Chart

    My proposal to complete/explicit a bit more your workflowhttp://files.engineering.com/getfile.aspx?folder=2cdf5628-2a91-473b-893e-6c19e1fe3d91&file=Decommissioning_work_Flow.docx
  7. RaRo

    Pressure drop to consider for Combination of Rupture disk and PSV

    The worst Kre I've seen for rupture disk is 5.6 (composite disks from Schlessinger). Be careful with using the 'default' value. I personnaly consider 3 by defualt for metallic disks, 1.5 for graphite ones, and 5.6 for composite ones.
  8. RaRo

    Liquid ring vacuum pumps

    Liquid ring vacuum pumps are essentially volumetric pumps. The capacity changes because of the suction pressure itself. Use your measured pressure to get the capacity (in Nm3/h for example - which is in effect a mass flow unit). Your actual volume flow (in Am3/h or effective m3/h) remains the...
  9. RaRo

    Sludge Depth Level Sensor For Slurry Pit

    Going, there exist weighted level 'floaters' for level or liquid/liquid level measurement. Those use either articulated arms (I would not recommend those) or piston/telescopic rods. Our supplier is Bilfinger Berger Industrial Services. Their devices are specifically made to the service (length...
  10. RaRo

    Sludge Depth Level Sensor For Slurry Pit

    Level measurement may not be the only way around your pumping issue. Would the apparent density of the slurry be correlated to the sand buildup? If it is, you may be able to simply use a vibrating blade density probe upstream the pump in the pipe if the speed is enough to prevent clogging the...
  11. RaRo

    Operation of Carbon Adsorption Equipment for Ammonia Exhaust

    If you are using atmospheric air you should reduce the relative humidity of your air if it's high (condense it then heat up the air) to preventadsorbing too much water on the carbon
  12. RaRo

    CO analyser for hydrogen stream (PSA)

    Maybe simple gas photometry (infrared) could be used. You can easily get something between 1 to 5ppm resolution.
  13. RaRo

    What is a upset condition for a tank?

    and low temperature (<-20°), high wind and snow loads while you are considering external upsets...
  14. RaRo

    What is a upset condition for a tank?

    That's vague... Based on your 8 words sentence, barring mechanical issues and corrosion, I would say: overfilling overpressured underpressured wrong material contamination excess heat (from heating, reaction or heating medium leak) and its reverse
  15. RaRo

    Thermal Relief Spacing

    Old thread with info For liquid that could not vaporize given the conditions and would not flash when relieved, we considered 250 liters as the maximum blocked-in liquid volume in pipes exposed to sunlight before installing a thermal relief valve We had a liquid expansion coefficient limit to...
  16. RaRo

    benzene recovery

    I agree BigInch. But a recovery system is different from a treatment system... The AP42 material linked by TD2K seems quite substantial. Thank you! Any addition of benzene to the tank will generate an emission of nitrogen+VOC load to your VRU. Your mass balance for the unit should be enough to...
  17. RaRo

    benzene recovery

    unless you are storing the benzene at high temperature, I don't think a recovery system would be financially beneficial. Consider that. You may have to switch to simple emission control by ad- or absorption, or incineration.
  18. RaRo

    Desalter Design ,specification

    with PPM = mg / Litre 1 PTB =2.8530 PPM 1 PPM =0.3505 PTB That's a factor 3 in efficiency. So as poli60 said, achievable with a 2-stage desalter scheme.
  19. RaRo

    HTRI noncondensable gas venting query

    The toluene-water is a known binary. The first dew point will be either with one of those two compounds or with the binary.
  20. RaRo

    DIERS applicability for two phase flow

    It also applies to exothermal reactions, decompositions, anything that may makes your liquid foam and have a biphasic relief stream at the relief device inlet.

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