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Recent content by pvcguy

  1. pvcguy

    Incinerator Stack Design Issues

    We are located north of the US and are regulated on what can go out the stack. If your former employer scrubbed the stack effluent they may not have had the same issues with HCL corrosion in the stack.
  2. pvcguy

    Incinerator Stack Design Issues

    Does anyone have experience designing incinerator stacks for the incineration of VCM trace gases? I apologize in advance for the length of my question. At our plant (PVC) we use a Brule designed incinerator to burn off inert gases which vent from processes containing nitrogen and very low...
  3. pvcguy

    Quantifying Leaks

    Does anyone have a quick and easy method of quantifying the amount of leaking during a hydrotest using the pressure applied and the pressure drop over a defined period of time. We have hydrotested exchangers and found a pressure drop. The question always is "how big is the leak"? Thanks
  4. pvcguy

    Centrifuge "beach" area

    Has anyone any experience with centrifuges for the separation of PVC slurry and water? We are trying to find out what the design basis is for the “beach” area of the bowl. We have been quoted 15/3 or 15/5-degree angles for this area. Nobody has been able to explain what the advantage is for...
  5. pvcguy

    Centrifuge Material

    We are required to purchase a replacement PVC slurry centrifuge for our process due to deterioration and cracking found in our present 304 SS equipment. Our supplier is recommending that the new equipment be of 2205 or Inconel material. Has anyone had extended life using any of these materials...
  6. pvcguy

    Centrifuge Material

    We are required to purchase a replacement PVC slurry centrifuge for our process due to deterioration and cracking found in our present 304 SS equipment. Our supplier is recommending that the new equipment be of 2205 or Inconel material. Has anyone had extended life using any of these materials...
  7. pvcguy

    Condenser Vapour Space SSC

    Thanks for the information unclesyd. One last question. Safe ending = ?
  8. pvcguy

    Condenser Vapour Space SSC

    unclesyd Sorry about the long reply time but issues, issues, issues. Tube sheet venting appears to be the most appropriate design change for our vertical heat exchangers with cooling water on the shell side. Our process design department is questioning the effectivness of say a 1/2" or...
  9. pvcguy

    Spiral heat exchanger failure

    Rob The radiused end was on the rectangular hold-down spacer bars found inside headers. These hold the shell together and provide strength for the header / nozzle. The ends of these were designed straight on a previous unit and now have been changed. As for the spacer pins with larger diameter...
  10. pvcguy

    Spiral heat exchanger failure

    Rob As already wrote I spoke with an other company who had a representative at the Alfa Laval plant when the rolling took place to ensure the pins were long enough so there was no gap. The inspector there indicated this worked very well. Just the fact that Alfal Laval has a repair plan for this...
  11. pvcguy

    Spiral heat exchanger failure

    Rob At our facility (PVC plant) we too have had failures of our spiral exchangers so I can relate. Previous failures include cracking of welds on the centre spirals, cracking of welds at the inlet header and pinhole leaks at the spacer fusion welds and in the plate closure welds. In some of...
  12. pvcguy

    Condenser Vapour Space SSC

    We have recently experienced what our corrosion engineer has labeled as Vapour Space SCC of 316SS condenser tubes in a vertical heat exchanger unit. I'm looking for online and would appretiate a nod in the right direction for any information on this fairly new phenomena in our plant
  13. pvcguy

    In Service Inspection of Control Valves

    James I have seen valves up to 6" easily x-rayed using a cobalt source. Not every NDT contractor has a cobalt source it's worth a try.
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