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Back pressure question for fixed RPM engine

Back pressure question for fixed RPM engine

Back pressure question for fixed RPM engine

(OP)
We have a 125kWe natural gas generator set (having a 8.3L 1800 rpm turbocharged engine). The genset is housed in its oem enclosure w/internal silencer and has the vertically oriented tailpipe w/rain-cap just clearing the enclosure roof (nothing esoteric, just standard stuff). Anyway, our client wishes to extend the tailpipe section ([b]after[/b] the silencer) by about 6 feet. Will this be ok? I don't know if back pressure will be adversely affected or not on a fixed rpm engine.

Thoughts?

RE: Back pressure question for fixed RPM engine

If it is downstream of the muffler it is unlikely to have an appreciable downside.

MS

RE: Back pressure question for fixed RPM engine

From a backpressure perspective, an easy thing to do. From a support perspective, not so much. I once did about the same thing, on about the same sized unit, and the support system for the additional exhaust pipe was the biggest cost and actually required a separate support structure. The genset mfr. wouldn't allow any new loads on the enclosure, insisted on a flex joint to prevent any loads on the existing exhaust system, on and on. Thermal growth is considerable and support has to be maintained. As I recall we also had to add a drip leg for condensation.

RE: Back pressure question for fixed RPM engine

From a backpressure standpoint 6 feet isn't too back. I have seen installations with 10 or more times that much extension and it did affect performance.

RE: Back pressure question for fixed RPM engine

(OP)
Thanks very much to all for your feedback. We got it licked :)

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