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  1. goutam_freelance

    FEA analysis with thermal loads

    If you are doing static with heat transfer, then the vessel will try to heat the lifting tool, the thermal expansion of which is likely restrained as the base of the tool may be at a lower temperature. So this may introduce additional stress.
  2. goutam_freelance

    Use of Gate Valve for Throttling

    As the wedge will lose contact with the seats under low flow conditions, vibration of the wedge may occur, which may damage the wedge and seats.
  3. goutam_freelance

    U-bend before pump suction inlet.

    In case it is a priming arrangement, there should be a water connection with a valve at the top for refilling the pipe(priming tank) in case it gets drained due to leakage or backflow.
  4. goutam_freelance

    U-bend before pump suction inlet.

    It introduces pressure drop as already been said. Which increases possibility of cavitation. It introduces flow disturbances at suction increasing the propensity for cavitation again. It provides a place for air to accumulate and thus may result in vapor lock and reduction of flow.
  5. goutam_freelance

    Process Chill Water Loop for Multiple Machines with varying requirement.

    The 2 in(50 mm) pipe size has about 0.001963 m^2 area. 200 gpm flow is 0.01261 m^3/s. So the velocity is 0.01261/0.001963=6.4 m/s, which is high.
  6. goutam_freelance

    Process Chill Water Loop for Multiple Machines with varying requirement.

    The flow velocity in 2 in header with a total 200 gpm flow is around 6 m/s, which is high. There will be a significant pressure drop in the header itself. So, a thorough review of pipe sizes along with the pump head-capacity curve is required.
  7. goutam_freelance

    Thermodinamycs. Formula to calculate the efectiveness of a regenerator

    Version 1 is used generally. Version-2 will give the same result as version-1 if the ideal gas cycle is used, as enthalpy depends on T only and not dependent of P. If the actual gas cycle is used, then the normally used formulae for gas cycles can not be used any more, and enthalpy depends on...
  8. goutam_freelance

    Relieving temperature PSV

    First, you calculate the enthalpy at 7 bara saturated. Then do iterations to match the enthalpy at 1.37 bara by successively changing the temperature and getting the enthalpy from the software.
  9. goutam_freelance

    Pipe wall thickness calculation method for t≥D/6 or for P/SE>0.385

    A caveat; pipes are not in scope of VIII-1. Special considerations of stress ranges, fatigue etc. will be necessary as per B31.1.
  10. goutam_freelance

    Relieving temperature PSV

    @Dulli2000 Thank you for letting the cat out at last! 1. If your PSV set pressure is above the saturation vapor pressure at the particular temperature inside the vessel, it is possible that relieving pressure will not be reached just when all the liquid has vaporized. Pressure will increase...
  11. goutam_freelance

    Fire Hydrant

    NFPA typically specifies an underground valve roadway box. The indicated valve location will have difficulty in operation. However, the same may be as per AHJ clearance. Regarding the coverage area of hydrants, it depends on local practice and AHJ.
  12. goutam_freelance

    Relieving temperature PSV

    @Latexman , I thought he is using steam.
  13. goutam_freelance

    Relieving temperature PSV

    Assuming you want the temperature at the outlet of PSV, where the pressure is 1.37 bar(a). The process is adiabatic(isenthalpic). Using the steam table software in Excel, the required temperature at the exit of PSV is 144.5 deg C.
  14. goutam_freelance

    Cavitation while running 1 pump but not 2

    Was the pump running OK before and the problem started now?
  15. goutam_freelance

    Pipe wall thickness calculation method for t≥D/6 or for P/SE>0.385

    You can try to use Sec VIII Div 3 which caters to high pressures. Even though piping is outside its scope, it is permitted to design as per this code and get a U3 stamp if necessary. Even though formulae for stresses in thick walled cylinders are available, the complications will arise due to...
  16. goutam_freelance

    Cavitation while running 1 pump but not 2

    Difference is 20 psig, but you wanted 10 psig. Is there a control issue? Also is there any unknown obstruction between suction pressure gage and pump suction?
  17. goutam_freelance

    Multiple cooling Tower equalization issue

    What are the flow situations inside the running cooling towers and standby cooling towers? Was the performance of CT normal? CT basin Level normal can mean that the make-up control is running normally.
  18. goutam_freelance

    select a suitable material for the tank used to store demineralized water before hydro testing.

    Is this for a thermal power plant? If so, we normally use DM water storage tanks for hydrotesting. DM storage tank material is commonly CS with epoxy-based internal and external coatings.
  19. goutam_freelance

    Vessel for Hydrotest over MAWP

    Asper VIII-1 clause UG-98, each MAWP has a coincident temperature. Also, the MAWP can be specified for more than one temperature condition. So, if the Inspector certifies the MAWP at room temperature(after calculation) in addition to the existing MAWP at operating temperature, then if the new...
  20. goutam_freelance

    Medium for calculation of PSV relief rate

    Refer Mandatory Appendix 11 of Sec VIII-1 for correlating PRV capacities for any compressible fluid with the tested capacity with air as medium. However, please check with latest code (i.e with Sec XIII) as I do not have the latest code.

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