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  1. Impdrew

    ferric chloride, pacl, microbiological removal performance

    Bimr, Thanks for the response This source, although not definative, shows signs of a marked difference in microbiological removal outside of the normal solids loading removal...
  2. Impdrew

    ferric chloride, pacl, microbiological removal performance

    Can someone please advise comparison of efficiencies for removal of coliform and e-coli by ferric chloride and poly aluminium chloride for coagulation, flocculation, DAF and onto RGFs (and ph dependancies). We have a pre-treatment plant DAF plant with something like 75-80% turbidity removal at...
  3. Impdrew

    Chemical dosing controllers

    Filip, Not sure exactly what you are asking here ? We have been a fan of using PLC controllers (AB mainly) where we utilise a number of dosing modes. For SBS, we would tend to have a feed forward sample providing a chlorine residual signal and feedback sample providing also providing a...
  4. Impdrew

    Combined Water/Air Backwash of RGF

    A practical limit does exist: It is important not to exceed the designed backwash flow rate during a combined was-air scour stage due to collapse-pulsation leading to RGF media being carried over the launders. Depending on the wash sequence that you are employing, there are a number of factors...
  5. Impdrew

    What is inventor all about

    Thanks all, Exactly what I needed. Great off the cuff description aardvarkdw. Looks like I have a new skill to learn.
  6. Impdrew

    What is inventor all about

    Can someone please highlight for me what the main benefits are of inventor over the Autocad software. Is it a bit more like Pro-Eng? I have never used it before but it is coming up in more and more of my dealings and I am just trying to find out if it is something I need to put time to. Cheers
  7. Impdrew

    Read any good books lately?

    Or..instead of reading too many self-help books, use the money to enrol on a study course on a topic you have never done. The fresh challenge will pick you up, might open a new avenue or at least give you a break. I used to know a doctor who instead of holidays, he often took a locam for a few...
  8. Impdrew

    Difference between Management and Leadership?

    Projects often have natural leaders that are right for the role. They often lead whatever. Some lead just by pure enthusiasm, determination and because they have what is missing in the rest of the team. Usually, they are good engineers and people you will follow. Some good leaders just lead...
  9. Impdrew

    Design for deep water well - Vertical turbine line shaft pump

    ccc123, I have come across some disastrous jobs where estimations have been made from insufficient well draw down tests, both in terms of abstraction rates and the time of tests. A number of these have lead to lowering of pumps at a later date, which is costly and usually an operational...
  10. Impdrew

    Why Sustainable Development

    Engineers are often merely pawns in this big bad world!!!! It is by engineers hands and brains, technological discoveries and applications, that "develpoment" occurs. However, it is not engineers who always decide how and when it will be used, that is left to the financials and the...
  11. Impdrew

    trying to buy international equipment (from China)

    Hi, By now you have probably found manufacturers. Otherwise, I may be able to help you as I have a large number of contacts with international manufacturers of such equipment as well as contacts at their offices/agents in China and the greater asia region.
  12. Impdrew

    Chinese Pump manufacturer experience

    Hi, I am interested in finding out if anyone has any experience with Asian manufactured pumps (and their associated motors) such as those manufactured in China. I am looking to see if anyone has used any pumps manufactured in these regions, and if they have any advice on whether they are worth...
  13. Impdrew

    Dearators for small back pressure turbine systems

    Hi johnhp Yes that is correct. In the operation of boilers and steam turbines at high steam pressures one needs to remove air trapped in the steam/condensate by boiling and venting it. This is usually done as part of the boiler feed water heating,where the deaerator can be seen to both remove...
  14. Impdrew

    Balanced Draught: Induced draught and forced draught fan calculations

    Apologies noted that i left out the loss accross the heat recovery system and pollution device, it being the difference between the two fans, i.e: 350 mmH2O (i guess therefore a 'balanced draught').
  15. Impdrew

    Balanced Draught: Induced draught and forced draught fan calculations

    Hi, Not so sure about the concept of balanced draught for forced draught in boiler systems. I have been given an estimate by a furnace manufacturer of: Draught (pressure) accross the grate/bed of the incinerator of 150 mmH2O supplied by primary air forced draught fan, air temperaure of 200 C...
  16. Impdrew

    Air heating for small incinerator waste to energy

    Hi, i am designing a small scale incinerator plant for waste to energy. Concern is over the need to preheat combustion air prior to it entering the air heat exchanges utilising exhaust flue gas. Due to the corrosive nature of the flue gas and its relatively high acidic dew points i am concerned...
  17. Impdrew

    Engine that operates on waste heat or low quality fuels

    Yes, agree with Elvey's comments. The 'Stirling Machine' cycle as an external combustion engine has been around for a long time and many attempts have been made at utilising it. The theory is well worth the read, and if you do a search on any of the main search engines you will find that many...
  18. Impdrew

    Dearators for small back pressure turbine systems

    Hi, i am new to the world of boilers and steam system design and would like to know if one still requires to place a deaerator for condensate after being used for process heat, and that has come from a back pressure (no-condensing) turbine at say 4 bar, where the steam/water remains at...
  19. Impdrew

    Deaerating type Condenser

    Hi, I am unsure if i am posting this in the correct place, aplogies if not. On the subject of deaerators. My knowledge of their operation is limited , but i have a small capacity system to which i am unsure how to apply, or whether i need to apply, a deaerator. Required boiler feed water...

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