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  • Users: shvet
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  1. shvet

    Wet scrubber - what happens if you continue to re-circulate a scrubbing liquid?

    water will be completely lost with a gas or will be substituted by components of a gas having lower vapor pressure than water has
  2. shvet

    PSV sizing acc. to IGC

    specify the standards where the formulas were taken from
  3. shvet

    Bored, cased pipe cathodic protection

    @jbraud Can you describe? 2" of insulation seems rather low for a pipeline operating at 350°C. How is the groundwater prevented from boiling away? Is this pipeline in intermittent service, which would consider an electrochemical corrosion? What type of pipe support is applied to compensate for...
  4. shvet

    Compensating pressure in Cryogenic Storage Tank

    https://www.carbon-dioxide-properties.com/ https://www.eiga.eu/uploads/documents/DOC056.pdf
  5. shvet

    PSV Inlet and Outlet Pressure Drop Calculation Question

    Gentlemen, are you sure that all those piles of formulas are worth the time spent? Is it still engineering, or is it already some sort of science? If it’s the latter, then does piping sizing really require piles of formulas? There are a lot of apps on the web available for sizing CVs, PSVs...
  6. shvet

    Control Valve Pressure Survey

    incorrect, flow disturbances just up/downstream of a CV are excluded from Cv calculcation this is a popular misconception measuring dP exact up/downstream of a CV (points where bleeds normally are provided) Cv will be irrelevant to one provided by a CV's manufacturer CV's dP is not the P1-P2...
  7. shvet

    Hydrogen Separation Distances

    What do you actually mean storage? And the distance from what to what? In general it depends on the jurisdiction and equipment type. Factory Mutual's Property Loss Prevention Data Sheet 7-91 table 2.1.2.6. AIGA's standard 87/20 para. 6.2.2 EIGA IGC's standard 75/07 app. B or 15/21 para. 6.2...
  8. shvet

    Relieving temperature PSV

    relieving T&P&composition are referenced to PSV upstream conditions when a PSV's seat is in an open position
  9. shvet

    Zone classification for sewage storage and packing system

    Refer to NFPA 820 table 6.2.2.a row #13 The Ex-zoning is not mandatory given the condition that the cake handling space is continuously ventilated at 6 air changes per hour. Otherwise the entire room shall be designed as zone 2.
  10. shvet

    Friedel's Model (two-phase) and Noise Attenuation Questions

    Is it what you are looking for? or this?
  11. shvet

    Zone classification for sewage storage and packing system

    Organic biomass is always a source of methane as a result of anaerobic biodegradation. Given that the sludge is stored and packed in an oxygen-depleted atmosphere, it does generate some methane contaminated by H2S and CO2.While methane is inert to the human body, H2S has an extremely low acute...
  12. shvet

    Zone classification for sewage storage and packing system

    Still lack relevant information. 1/ this is not sewage. It is called sludge. What is the origin of this sludge? Is it municipal wastewater? Surface water? Process? Froth from a flotators? Aeration tank sludge? 2/ municipal sludge produce more CH4 than H2S. Typical ratio is 150:1. Why do you...
  13. shvet

    Medium for calculation of PSV relief rate

    No, this is not as a manufacturer testes and certifies the PSVs on an air bench. They are not able to certify the PSV capacity on multiple fluids. Massflow has nothing to do with PSV capacity.
  14. shvet

    Zone classification for sewage storage and packing system

    1/ Descrbe the sewage. Describe the house. 2/ What about underground sewer system and pump station - is it designed Ex-proof or not? Is the sewer system segregated? 3/ What is the sources of water? Is it process drains or a surface water drainage? 4/ Why H2S? Why not CH4 or HC? 5/ Do you...
  15. shvet

    Pressure drop

    On Model Palette find "Piping&Hydraulics", then click on "Piping segment" and add the segment into a flowsheet and specify it. For details use the local examples of pipelines modelling into the "Aspen Hydraulics" examples folder. Note that misposting is a violation of Forum's policies...
  16. shvet

    Wer H2S at elevated temperatures debate

    @hussaindawki Curious why not to address to API 571 Fig. 5-71? Why do so common process, like HCU is, need an equipment design from scratch? For info - some pointers can be found also in API 581, 932, 934, 939, 941, DNVGL-RP-F104, ISO 17348/17349 and in references in those. A material...
  17. shvet

    Flame Arrestors on Natural Gas and Oxygen Vent Lines

    The 4 or 30 m/s limit is not challenging to achieve during an uncontrolled purge or relief. EIGA's std. 13/12
  18. shvet

    How to dump to 50% of vessel's design pressure

    PSVs have nothing to do with depressurizing. You should reconsider what para. 4.6 is talking about.
  19. shvet

    How to dump to 50% of vessel's design pressure

    The set pressure of what? A rupture disk or an ESD? Are you confusing the PSV blowdown pressure with the pressure vessel depressuring? More details = better answers
  20. shvet

    static mixer

    This is the prompt you to start with the basics and rely less on the beliefs of unknown people. This is chemical engineering, which is not rocket science, correct? Many generations of engineers have gone this road before you, correct? Is it wise to ignore their experience? If you have truly been...

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