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  1. misterd

    Packed-bed scrubber - Acid washing

    We are operating a packed-bed scrubber for odour removal (SO2). A caustic/hypo solution is used to scrub mercaptants. Would anyone have a recipe for acid washing to remove scaling? I have read about muriatic, sulphuric and phosphoric solutions but I cannot find the recommanded...
  2. misterd

    Estimating software

    We are looking for an estimating software for our company. We have identified a few potential ones, but the webpages are pretty similar. Has anyone heard of Skire? International Project Estimating? These softwares are combining many options (and softwares) and are more powerful than MS...
  3. misterd

    Stacks?

    We have to install a 16' high exhaust stack made of SS 316. The temperature of the gases passing through the stack will be around 780 F. Questions : - At what height should we attach the cable? - Is there a recommanded angle for it? - What should we install to consider high temperature...
  4. misterd

    pH system - Design criteria

    What is the design criteria for sizing a tank that would be used for pH adjustment? Assuming continuous feed of 25 gpm, proper mixing, what would be the proper dimensions for the mixing tank?
  5. misterd

    Ventilation ducts - Wall thickness?

    Where can I find standards in order to determine the right gage for a new ventilation system (6500 CFM, 320 F, low pressure)... Thanks
  6. misterd

    Quench tower?

    We have to design a quench tower to cool down hot air (420 F) to 140 F. The quench medium would be water. What diameter for the quench? length? residence time? Do we nedd packing?... Thanks
  7. misterd

    Oily Seawater separator - Material?

    We need to build a wastewater unit for separating oily water genereted by a naval test establishment. Water is heavily contaminated with solids, cleaning chemicals, emulsied oil and synthetic seawater. From the collection tank, the wastewater will be treated through an ultrafiltration unit...
  8. misterd

    Induced air? Cavitation? Pumping problem

    We are starting a new wastewater unit using ceramic membranes. The problem with those membranes is that they are "allergic" to air. If the water stream contains air, the membranes will collapse. After running for a month, one membrane exploded...After analyzing the possible causes, we are...
  9. misterd

    PVC/FRP Tanks - Thickness?

    We would like to find a book or software in order to size pvc/frp tanks for our plating lines. We are dealing with chemicals with different specific gravity : it is difficult for us to choose the right thickness. Where can I find rules of thumb for different products or design criteria?
  10. misterd

    Design - Quench tower

    How do you size a gas quench tower. We have to design a quench to cool down hot air (420 F) to 140 F. This would be done using water injection. What diameter for the quench? length? Rule of thumb for residence time?...
  11. misterd

    Mixer... Gear versus direct

    I have to size a mixer for a batch system. The fluid has a viscosity of 300-500 cp and the tank can contain 350 usgal. With my estimate, I would need a direct drive mixer with 2 hp. My supplier is recommanding a gear drive mixer with 3/4 hp. Hmmm... I have never used a mixer like that, but I...
  12. misterd

    Valve sizing + heat exchanger

    We are trying to size a control valve to feed an heat exchanger. The inlet pressure is 100 psig for a flowrate estimated at 195 lb/hr. What is the rule or how can I figure the dP across the valve? From what I understand, the steam trap will keep the pressure in the heat exchanger. Should I...
  13. misterd

    SCH 40 or SCH 80? Wood preserving industry...

    Since I do not have the guidebook for ASME B31.3, can someone tell me where to find (on the net) the Sh factor or allowable stress of material for steel pipes. I am not familiar with all the standards and I am trying to choose between SCH 40 or 80. Thanks
  14. misterd

    Recycling contaminated wood dust and particles

    I have been approched by a firm who builds kitchen cabinets. When cutting the wood they produce lots of dust and wood particles which are contaminated with ureformaldehyde. Since it is so expensive to dispose of it they would like to recycle it themselves. What can they do with it ??? New...
  15. misterd

    Quench tanks - air treatment?

    How do you treat oily smoke coming out of a quench tank? Hot metallic parts are immersed in oil and vapors are emanating of the tanks. Any experience or reference?
  16. misterd

    excess of formaldehyde - air treatment

    What is the best way to reduce (treat) emissions of formaldehyde coming for pulp processing? would it be enough to use a scrubber or go for some adsorbent?

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