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  1. mechprocess

    Submersible vs Vertical Turbine (Raw Water Feed)

    What are the pros and cons for using a submersible pump instead of the typical vertical turbine pump? I read that submersibles have problems with thrust bearing load limitations during starts and stops, oil seals leakage, maintanence repair costs, motor efficiencies etc. My wet well is about...
  2. mechprocess

    Pumping Station Design

    Re: Pump Intake Design ANSI/HI 9.8 Subject: Minimum Submergence requirement to prevent surface vortex I have a vertical suction pipe with a bell on the end of it located in a dished tank containing suspended solids slurry. I want to eliminate the need for a vortex breaker at the suction...
  3. mechprocess

    Measuring Convection Coefficients using a heat flux sensor

    Does anyone have experience measuring convection coefficients using a heat flux sensor with an attached thermocouple and heat sink? I have a mix tank and I'm trying to measure the convection coefficient on the inside of the tank wall. I have placed an ice bath on the outside of the wall to...
  4. mechprocess

    Process Fluid Minimum Contact Temperatures

    These questions are related to the minimum process liquid contact temperatures during tank cooling. I am worried that the low tank wall temperature effected by the external cooling jacket may cause aluminum oxide precipitation from the 5.6 M caustic solution inside the tank. I am designing a...
  5. mechprocess

    Will this be an effective method for measuring blend time

    I want to measure the blend time of a solution containing 5 wt% total solids. About half of the solids are suspended. I defined the blend time as the time it takes to resuspend and totally blend the suspended solids from an initial sludge level. The solution is opaque and dark and the solids...
  6. mechprocess

    Where in UG-125 are Relief Valves mandated as Relief Devices

    Sorry if this is already covered. The thread I found was closed and now I have this same question. I need to provide relief for an air receiver. The only credible over pressurization scenario is fire case while vessel is valve closed isolated and heated by fire. This includes the inlet to the...
  7. mechprocess

    I need help with a 2 dimensional fluid flow analysis

    I want to be able to determine the zone of influence of a submerged jet of liquid impinging 90° perpendicular to a flat plate inside a tank with a known liquid density and a known working liquid level. I suppose I am looking for a velocity profile in two dimensions with the assumption that there...
  8. mechprocess

    How do you break up a program?

    I have this For Loop and it is very long. I would like to do a page break and continue it on the next page.
  9. mechprocess

    How much Agitation Do I Need To Wash Caustic?

    I have a continuous water feed which equals my wash water filtrate. How many turnovers per hour assuming eductor mixing? What Chemscale? assuming mechanical Thanks
  10. mechprocess

    Problems with two pump filter system

    I'm feeding a cross flow filter loop with a feed pump. The loop has a recirculation pump, high flow medium TDH that circulates slurry through a cross flow filter. A bleed back slurry flow returns to the feed tank through a back pressure control valve. The recirculation pump is cavitating during...
  11. mechprocess

    How do you control a two pump cross flow filter system?

    This thread is dedicated to a two-pump cross flow filter systems. All experienced comments are welcome regardless of system functional issues. I have a system that uses a feed pump and a recirculation pump, a cross flow filter and back pulse tank. The slurry is feed into the filter loop system...
  12. mechprocess

    Min. Wetted Side Surface Area Coverage for tank JKT?

    Aside from heat transfer correlations and energy balance calculations, is there some guideline that stipulates the minimum percentage of a tank straight side wetted surface that should be covered in order to have adequate cooling inside a tank? I am jacketing a tank on the bottom and on the...
  13. mechprocess

    What is the effective surface area of a half pipe jacket?

    What is the effective surface area of a half pipe jacket? The program DeltaT credits the tank surface area between half pipe loops. I am using 3 inch sch 40 180° half pipe, 7 inches on center. This leaves 3.5 inches not covered between the loops. I need some sort of reference that tells me how...

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