Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: patrickraj
  • Content: Threads
  • Order by date
  1. patrickraj

    Centrifugal Compressors-Polytropic VS Adiabatic

    Dear Members, In Centrifugal Compressors we calculate Polytropic efficiency only -Why not adiabatic efficiency ? Where we calculate and use adiabatic efficiency? Thanks in advance.
  2. patrickraj

    STHE tube side inlet & outlets are at the same end

    Dear members, Though add no of tube passes are not unknown, most STHE have an even number so that both tube-side inlet and outlet piping connections are made at the same end.What are the advantage? Thanks in advance.
  3. patrickraj

    March 1981 issue of HYDROCARBON PROCESSING

    Dear members, In March 1981 issue of HYDROCARBON PROCESSING page 135, an example is given for partial condensers. Some-one could clarify what is the dry gas flow and dry gas molecular weight. The gas stream is being natural gas how molecular weight could be 36.7 against natural gas molecular...
  4. patrickraj

    STHE - Inclusion of " pipe K" and thickness in "U"

    Dear members, As in page no- 62 of Applied process design for chemical and petrochemical plants by E.E. Ludwig volume three, how to incorporate tube material thickness and conductivity in the worked out example in page no-106(Condensation in the presence of non condensables).Any suitable...
  5. patrickraj

    Pressure drop values given in the STHE

    Pressure drop values given in the STHE data sheets are inclusive of nozzle pressure drops or exclusive of nozzle pressure drops. Thanks
  6. patrickraj

    How to calculate pressure drop in t

    How to calculate pressure drop in two phase separators.Relevent references? Thanks in advance
  7. patrickraj

    70% Conc Sulphuric

    For 100% conc of H2SO4 CS is suitable. What material is suitable for 70% Conc Sulphuric Acid.Pump(Impeller) and Piping. Thanks in advance.
  8. patrickraj

    Relief valve - 1/3 and 2/3 area.

    Dear members, In relief valve calculations,to avoid chattering because of flow capacity is small, two valves are choosen when calculated orifice area is high, with approximately 1/3 and 2/3 area. The smaller valve can be set to relieve at 3% higher pressure than the larger one. Why is it so...
  9. patrickraj

    Equation for

    Dear friends, I use the following equation to calculate water VP. Error is very insignificant as shown below: VP.Calctd VP from Temp°F Psia Steam Table %Error 212 14.701 14.696 0.040 259.28 35.650 35.0 0.145 292.71...
  10. patrickraj

    Equation for STHE nozzles and pressure drop

    Dear members. I use the following equations to calculate inlet and outlet nozzles' dia : S(V)2 = 3000 max. Where S - Density kg/m3; V - in M/S And the following equations to calculate the pressure drop in the nozzle. Inlet nozzle = rho R(V)^2/9266 Outlet nozzle = 1.25 rho R(V)^2/9266...
  11. patrickraj

    Available Static Head is Sufficient or Pump is required

    Dear friends, Cooling water return header pressure is 1.2 kscg (at ground level). From this point, a tapping is to be taken to take 200 M3/hr of water to a distance of 650 mts(for further treatment). Following is the piping layout: 90°C bend - 35 Nos. 45 °C bend - 5 Nos. Gate valves...
  12. patrickraj

    Elevation and Pressure - calculation

    Hello all, Urea solution (99.5% CONC,1.221sg) flows from prill tower from 170 feet elevation through 2" dia SS pipe(40 sch) to 70feet elevation. At 70 feet elevation (horizontal pipe)Press. Gauge shows only 0.5 ksc against the calculated value of 3.72ksc.There is no flow indication at both...
  13. patrickraj

    Moisture content of air - STHE intercooler

    Dear friends, An air compressor second stage intercooler data sheet indicates that the air moisture content is 1513 Kg/hr. But as per my calculation, it is only 1415.6 Kg/hr. Following are the calculation details : Dry air flow First stage =61600.0Kg/Hr First stage outlet air...
  14. patrickraj

    Equation for conductivity value of organic liquids

    Dear friends, To calculate thermal conductivity value of organic liquids I found the following formulae in April 12,1975 issue of Chemical Engineering. Is it can be used to calculate thermal conductivity value of SAE 10W oil. K =0.000877 x Density^(0.83) x (293/T)^(0.38) Cal/(s-cm- °C) Cp...
  15. patrickraj

    LMTD in the presence of noncondensables.

    Dear friends, How to go about calculation of LMTD(corrected) for STHE in the presence of noncondensables.I have no problem without the presence of noncondensables. Thanks in advance to all.
  16. patrickraj

    Thermal conductivity value for SA-214 STHE Tubes

    Dear friends, What is the thermal conductivity value for SA-214 STHE Tubes?(100 to 212eg F) Any relevant websites please. Thanks in advance.
  17. patrickraj

    Calctd NPAH(A) is 286 feet , but data sheet value is only "20"feet

    We have a horizontal centrifugal pump for ammonia service. Pump is taking suction from a horizontal cylindrical tank located at 20.0 feet elevation(from tank bottom). Pump suction pressure : 279.7 psiA Temperature : 100°F Sg : 0.58 4 Vapour pressure at 100°F : 212 psiA...
  18. patrickraj

    Reducing 15.0KSCG to 5.0KSCG

    Dear friends, I have a urea solution pump(135 deg c) that develops 15Kscg pressure and 15M3 flow. I want to use this pump for 5.0Kscg pressure and 15M3 flow(135 deg c). How I can control the pressure(In the new application 15 kscg pressure is not acceptable).Restriction orifice will help...
  19. patrickraj

    Roughness thickness for SS304/SS306

    What is the roughness thickness value for SS304/SS306 PIPE MATREIAL.Is it sams as commercial steel value of 0.00015feet. Thanks in advance
  20. patrickraj

    Vertical VS Horizontal

    In general, Vertical vapour liquid separators are mostly in use in CPI compared to horizontal separators.Is there any specific reason?

Part and Inventory Search

Back
Top