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cvg, You hit e nail on the head. It's to hold back the pressure exerted by the soil. Could probably assume saturated soil being that it's a sump. Terry

dik, Funny that’s where this whole issue got started! Spec said 21 and contractor proposed corrugated pipe that was rejected.

Vertical sump 12 feet from surface to bottom and 4 feet in diameter. Design calls for a SDR of 21. If I am looking at this correctly, on a 48 inch pipe this would require a wall thickness of 2.28” for an SDR of 21. That seems like overkill. Thoughts? TexChe

PLEASE CHECK THEORY AND ASSUMPTIONS I have four air-lift pumps operating simultaneously. The injection points are ~ten feet under the water surface and each of the pumps appears to move about 75 GPM. I figure what appears to be 75 GPM is about half air and half liquid so each air lift has 38...

bimr, If I had not read the link you sent I would not have believed it! The only thing that seems inconsistent is the patent unit, based on a quick look, seems to drop water in from the top and filter down through the unit likely in a non-flooded condition. Our unit remains flooded in the...

Inheriting equipment is great. I have an open-top anthracite filter that uses compressed air and water to backwash. Anthracite is supported by a plenum a couple feet off grade and the air is injected into this plenum. In the same plenum where the air is injected the original Walker Process...

Latexman and bimr, This has been very helpful. The roots blowers look perfect for the application and the compressed air route looks like it has potential but not a desireable route. Thanks Again, TexasChE

Hi Bimr, I switched over to absolute pressures like Latexman reminded me of and a standard shop compressor will deliver the necessary air. I assume regulators exist to drop to 5 psi but have not looked. I am just not finding 5 psi blowers on the market. Please let me know if I'm missing some...

I need to over come 12 feet of water column and deliver 200 CFM (Texas ambient T&P conditions) to a fluidizing/backwash process for 3 minutes once every several days. Having trouble finding a pressure blower to deliver the 5 pisg without a relatively big motor. The 200 CFM for 3 minutes means...

I'll see if I can locate the AWWA stds around our utility group. I'm guessing, unlike mains, there's no sampling to prove disinfection was achieved. Thanks for responding.

What temperature range are we looking at?

Have to install a new distribution pump into my final clearwell and looking for options for disinfecting it and documenting that it is free of bacteria.

The previous reply goes into pretty good detail. There may be options depending on what you are trying to accomplish by collecting the data. The US EPA publication AP-42 has published factors that can be used if you need some type of estimate. US EPA has test methods used to collect...

We have been successful at monitoring effluent from a WWTP using an ultrasonic level sensor aimed at the water "trapped" behind a weir. As you mentioned our sensor feeds signal to a SCADA system. Levels above the overflow height would be easily calculated into overflow volumes. I’d have to look...

I’m trying to determine if my anaerobic digester is leaking sludge back into other portions of the treatment wastewater system. Monitoring the level over a period of days with no sludge into or out of the digester I see a decrease in digester contents of about 2 to 3 percent over several days...

I have a large vessel (assume >100,000 ft3) equipped with a 2 inch ID butterfly valve that opens when the internal pressure is 6 inches H2O above atmospheric. The gas is CO2. I ‘m thinking some form of Bernoulli's equation would allow me to calculate the initial flow (ACFM) when the valve tips...

That makes sense. In that form I'll bet the density is close to that of concrete. A little more settling occured over the weekend and I'm at 83 lbs/ft3. Thanks again

I see it. It looks like there's some segregation of materials. Are yall recycling materials? Our lagoon is at: 30.538037°, -97.075185°

Aeronautics guys must use a different book.

Okay I'm impressed. Granted this was a down-and-dirty analysis but we collected a sample, cooked it in a 105 C degree over for several hours (ran out of time), and determined the weight to be 325 grams. Transferred it to a graduated cylinder and the dry volume was 270 ml or 75 lbs/ft3. I then...