Velocity Dissipater Manhole
Velocity Dissipater Manhole
(OP)
I'm designing a section of gravity sewer with a section of steep slope that falls into a very flat slope. (before manhole the slope is 9.4% and after 0.4%) My concern is with corrosion in the manhole and other possible issues with the high velocities. I've heard mention of some type of dissipator within a manhole. Is anyone familiar with anything such as this or have any ideas similiar in nature.
Thanks!
Brian
Thanks!
Brian





RE: Velocity Dissipater Manhole
Put in one size up for two pipe lengths and then another upsize before the structure. I just had a brain cramp. Put a structure 6-8 pipe lengths upstream from the grade break and another 3-5 pipe lengths down stream.Use this point to start your grade change, by deflecting joints. The pipe may get shallow but that can be taken care of. If you can get 1 degree less pitch for each pipe, you should be able to eliminate a lot of odor. And odor is just a sign that H2S is coming out of solution in the effluent.
RE: Velocity Dissipater Manhole
RE: Velocity Dissipater Manhole