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  • Users: shvet
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  1. shvet

    Dew point for RNG

    @MatthewL What is a problem to calculate NG dew point referenced to several potential abnormal process conditions? Most commercial modelling software provide comprehensive tools to do so quickly and easily: Pro/II, Hysys, Prode, ProMax, UniSim, PetroSim etc. Does such issue require so much...
  2. shvet

    Real or ideal cp/cv for orifice sizing

    Do you know this or believe in this?
  3. shvet

    Dew point for RNG

    Natural gas dew point, hydrates, water phase... Am I alone in concluding that the facility needs attention of an experienced process engineer to model process upsets and determine the margins&limits?
  4. shvet

    Is there a comprehensive chemical odor threshold database?

    A threshold means experiments must have been conducted. An expensive and complex procedure, I should note, with few opportunities of results being used by someone in the future. How many decision-makers are there who would waste budgets and human resources on such a thing? I suppose none, given...
  5. shvet

    Very High Temperature Piping Stresses

    As far as I know, those have not been updated or expanded. I will post in case stumble upon some.
  6. shvet

    Very High Temperature Piping Stresses

    for info List of alloys and their stregth applicable to 1.6k+°F can be found in the old ASTM publications https://store.astm.org/ds7-s1-eb.html https://store.astm.org/ds9e-eb.html
  7. shvet

    Is there a comprehensive chemical odor threshold database?

    The 13 references for H2S under the PubChem link is not large enough? How many do you need? If few, then what is wrong with these? Note that CAS# is more popular. For info - the ASTM data series are available https://store.astm.org/ds48a-eb.html https://store.astm.org/ds61-eb.html For info -...
  8. shvet

    Is there a comprehensive chemical odor threshold database?

    can you describe what you mean? a good source for odor threshold is PubChem, e.g. https://pubchem.ncbi.nlm.nih.gov/compound/402#section=Odor-Threshold&fullscreen=true
  9. shvet

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

    college coursework is not welcomed in case those are misposted https://www.eng-tips.com/pages/postingpolicies/
  10. shvet

    Can Service Pressure Exceed Design Pressure?

    for info
  11. shvet

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

    Incorrect. Mass transfer is impossible once the equilibrium concentration is reached. This is why you make up fresh solvent in a circulation loop—to keep the concentration of a pollutant in the circulating solvent below the equilibrium one. The further the concentration in the circulation loop...
  12. 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
  13. shvet

    PSV sizing acc. to IGC

    specify the standards where the formulas were taken from
  14. 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...
  15. shvet

    Compensating pressure in Cryogenic Storage Tank

    https://www.carbon-dioxide-properties.com/ https://www.eiga.eu/uploads/documents/DOC056.pdf
  16. 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...
  17. 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...
  18. 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...
  19. shvet

    Relieving temperature PSV

    relieving T&P&composition are referenced to PSV upstream conditions when a PSV's seat is in an open position
  20. 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.

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