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  1. Balledone

    Long Exhaust System

    Hi Greg This is the calc I used Pipe Length inc bends allowance L 460 ft Specific weight of gas S 0.029 lb/ft3 Exhaust gas flow Q 12600 cfm Inside diameter of pipe D 17 inch P (psi) = (L X S X Q2 / 5184 X D5) Do you know if density influences back pressure?
  2. Balledone

    Long Exhaust System

    Hi Mike I appreciate your direct answers. I was aware of most of what you have said prior to asking the question. And yes the Cat and Cummins install manuals say don't do it. However, I am from New Zealand and we often are asking "why not" on the assumption that in getting to a full...
  3. Balledone

    Long Exhaust System

    Hi Cheif, Thanks for the info. The flow is about 35m/ sec and back pressure a theoretical 2kpa at the temp and volume leaving the turbo at full rating. As it travels it will cool, slow down and get heavier. Do you know if this will tend to increase back pressure by the denser gas being "harder"...
  4. Balledone

    Long Exhaust System

    Mike, I really appreciate your comments from experience. I was not entirely comfortable with the design, hence doing research in the form of this forum. I understand what you are saying moslty, can you develop this a bit more <<<<<The bad actor is condensation of acid and such from saturated...
  5. Balledone

    Long Exhaust System

    Thanks for all of these thoughts. The pipes are external and the stack outlet is about 55metres above the engine. The last vertical run is about 45m (11 storey building) In regard to water, we understand we will be potentially dealing with 400 litres of water per hour so have made provision to...
  6. Balledone

    Long Exhaust System

    I am currently involved in putting together an exhaust system for a generator instal that has 2 x 30litre engines running into a single 450mm(18") pipe. This pipe has to run about 80m to clear the top of the building. The calculation on back pressure looks ok on paper. What happens to engine...

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