Recent content by MechanicalJoint

I'd check w/ a chemical feed pump company first. They will have more experience, knowledge and testing than anyone else. I've been very happy with ProMinent pumps (headquarted in Pittsburgh, PA) with local reps in Ohio. If your in Ohio, I'd check with a their Regional Manager Craig Dunn...

ditto on the ProMinent pumps....

Sounds like you've got some bad soils under the gravel

Check out: www.rinkermaterials.com/stormceptor/products/inline.htm

I typically never use a Mannings' n less than 0.013. Don't forget that most contractor's won't build what you design to "Lab" quality...which is where most of the n values are determined... For your K values, look for a government document called HY-8. It does a good job of...

It's hard to believe that you need to reduce the amount of water on the curb. A 1-1/2" pipe only convey about 32 gpm at 5 ft/sec...thats less than 0.1 cfs. Anyway... I don't think that ductile iron comes in 1-1/2" in our area at least. You may consider Schedule 80 steel with as...

Not sure what you mean by "in excess of the rated horsepower". Do you mean the pump will operate at a "bad" point of the pump curve or do you mean the motor that you are providing isn't adequate for that "bad" point on the curve? Perhaps, if you provide more info...

Hire someone or sub it out to another firm...Culvert design isn't just something to slop together...

To start with, I'd check with the your local sales reps for the manufacture's data. They can be your best source for this type of information

Situation: Existing WWTP with Aerobic Digesters. WAS, Chemical Sludge and Primary Sludge are being loaded to the digesters. Problem: I can't find any reference material for the air requirements (BOD and/or mixing) for digesters when primary sludge is involved. Any help would be appreciated!