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  1. Mech85

    Minimum Submergence for slurry

    Hi, I’m working on a brownfields project using an existing agitated tank to pump hot slurry into a flash vessel operating at 0.5 Bar abs. It is important to avoid air ingress as it impacts the efficiency of the flash vessel. I have checked the minimum submergence level to avoid vortex...
  2. Mech85

    Minimum Submergence and Froude Number

    Hi, The HI standard 9.8 "Intake Design for Rotodynamic Pumps" states that the Minimum Submergence for a horizontal bottom outlet from a tank can be given by S=D (1+2.3Fr) where D is the nozzle diameter and Fr is the Froude number The Froude No. Fr = V / SQRT(g*D) where V = nozzle velocity g =...
  3. Mech85

    Slurry Pump Data Sjeet from Hydraulics Institute

    Hi, In appendix A of the ANSI/HI 12.1-12.6 (2005) standard titled "Rotodynamic (Centrifugal) Slurry Pumps", there is a copy of Equipment Data Sheets for slurry Pumps in metric and US units. our technical library only has hard copies or PDF copies of the standards. I am looking for a native...
  4. Mech85

    Hydraulic design for flow of complex fluids by Hanks

    I am looking for a copy of Hydraulic design for flow of complex fluids: course notes written by Richard W Hanks Associates and published in 1981 I have carried out a search on the web but I have had no luck with Amazon and some of the other text book sites – they generally advise that the book...
  5. Mech85

    API 620 - 3rd Ed. 1965. Allowable Partial vacuum

    In the tenth edition of API 620, 2002, the following is written in Section 5.10.5.2 under "External Pressure Limitations". It states that "cylindrical sidewalls of vertical tanks designed in accordance with these rules for storing liquids..............may be safely subjected to a partial...
  6. Mech85

    Conical Strainer Pressure Drop

    Hi, I'm am looking for typical pressure drops across DN 750 (30") and DN 600(24") conical strainers on a cooling water application. Flow rate is approx 2400m3/h (~10,000gpm). The strainers are fabricated from 3mm (1/8") perforated plate and the open area is 150% of line cross sectional area...
  7. Mech85

    Vacuum rating of Tanks

    I have recently received a “short cut” vacuum rating calculation for tanks and vessels that states that the maximum vacuum that would exist in a gravity drain tank before air would enter is given by Vacuum (inches Hg) = 2.036*H*rho*(g/gc)/Po Where H = total tank vertical height in ft rho =...
  8. Mech85

    PSV Discharge Piping and Backpressure

    We have an existing conventional pressure safety valve which relieves vapour to atmosphere (0 kPa gauge). The PSV is being checked for use for a new operating scenario. The PSV has a tailpipe (discharge piping) consisting of elbows and straight pipe run. In determining the pressure drop ( ie...
  9. Mech85

    Anhydrous Hydrochloric Acid Piping

    Hi, I am looking for some recommendations and/or a piping standard for anhydrous hydrochloric acid? Typical concentrations are 32%w/w and dilute at 3 to 5%w/w. One piece of information recommends glass lined or rubber lined steel pipe. I am also interested in whether anyone has experience with...
  10. Mech85

    Bulk Viscosity Prediction of Slurry

    Hi, Can anyone help with a viscosity prediction for a slurry if the solids concentration is known and the viscosity of the carrying liquid is known. I have seen the equation by Einstein Visc slurry = Visc Liq*(1 + 2.5*(1-e)) where e is ratio of Volume liquid/Volume of mixture. However this...
  11. Mech85

    Anhydrous Piping Standard

    Can anyone suggest where I can find a piping standard for anhydrous hydrochloric acid? Typical concentrations are 32%w/w and dilute at 3 to 5%w/w
  12. Mech85

    Horizontal Tank Partial Volume Calculations

    Hello, I already have spreadsheets for calculating the partial volumes of horizontal tanks with various heads(flat, ellipsoidal, torispherical, etc) but I am interested if anyone has information for calculating the partial volumed of inclined horizontal tanks. I believe there may have been a...
  13. Mech85

    Swamee & Jain Friction Factor Equation

    Hello, The original Swamee & Jain explicit equation for friction factor calculation for turbulent flow in pipes has f = 0.25/[(log.....)]^2. I have also seen on the web f = 1.325/[(log.....)]^2. The difference is NOT the factor of four beween the Fanning friction factor and the Darcy friction...
  14. Mech85

    Recommended pipe velocities for hot thermal oil

    I am looking for some data on recommended pipe line velocities for thermal oil operating at 300 Deg C (572 Deg F) and at 120 Deg C (248 Deg F). The oil SG varies from approximately 0.9 to 0.8 and viscosity from approximately 0.8 to 0.5 centipoise. Using "typical" line velocities for...

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