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I love the automatic systems but we still have to maintain them. Really not hard as long as scheduled checks and maintainence is carried out. <P>It appears that the higher ups, had a bit of a SNAFU on the catalog for air release valves. Some brainiac figured that a series 400 valve ment any...

Thanks Bimr. The APCO valve is one of the types that (according to the manufacturer) keeps the operating mechanism above the fluid levels. I believe that our "normal" flow is up in the 3.7 GPM range (at least not above this) so if the system is operating correctly it will not meet the >4 GPM...

Thanks Rw. you notice that the valve listed is a vacuum breaker/air relief and APCO even says right in their page that if you want air removal during operation you need another type of a valve,which they do show on their "system" diagram on the last page. We were given only the vacuum break/air...

Been a bit since I had anything to add here; we are still fighting the issue. Bimr, we use the auger to remove most of the solids that go through the grinder and they are dumped into a dumpster which then goes to the local landfill. Sounds appealing doesn't it though. One of the first items...

[tab]Thanks again for the input. Alex, at this time we have a pressure gauge on the piping between the sump (wet well) pumps and the house pumps and whenever the pumps are running we have 35 PSI showing on the piping between the pumps. Next week we plan on opening up this section of pipe to TV...

Actually we have a seperate grinder unit that is in the sewer before it gets to the pumps. It is a "Muffin Monster" grinder that pulverizes everything before it even gets into the wet well. The pumps will "grind" and pass large objects (up to 3" I believe) but should not ever have to do this...

Thanks for all the info so far, sorry I have been out and about a bit. At this time we still have not found our problem. A litttle clarification on what I know of the project. Being a prison we are not willing to risk a grinder/pump unit, as inmates send far more items down the system than the...

Funny, my issues also relate to a prison facility, but operation not design. Rule of thumb for our design standards was 100 gallons a day per inmate. You need to add staff as used per shift as you will not have all staff there at same time. Don't forget for the contractors that come in and work...

and the sump pumpshttp://files.engineering.com/getfile.aspx?folder=803536c5-8d36-4d47-baaa-a3c2f01b5d57&file=C3.51_for_sewer.JPG

Oops, here are the two drawings if this works. :-)http://files.engineering.com/getfile.aspx?folder=1e5d42c9-61a4-4291-a3a5-012241f3b1de&file=reduced_for_eng_tips_C3.50.JPG

To everyone who has helped so far thanks a lot. Sorry I was not in office the last day or so but from what I have read the supply to the house pumps is sort of the direction my group is headed. I do agree that every valve needs to be (and already I've been told it has been done once but I want...

Our facility sewer system dumps into a 25' deep 10' in diameter wet well that has two submersible pumps located in the bottom. They pump out of the tank (one or the other runs each time, cycle and trade off same as the two pumps in the house) and into the pump house you see in the photo to the...

Thanks for the input. We have been playing with this issue for several months now and everyone just wants it to get over. We may be calling in an outside engineering firm to come in and do the calcs as you have mentioned. Civilperson, good point about the pumps cycling so often...

we have 6" pipe through the pumphouse and where it 90's down to go into the floor and underground outside it goes to 8". I believe we have a 4" to 6" expansion off of the pump. Ductile iron is used through out the system, from the wet well to the gravity sewer (I just tried to shoot a photo of...

I guess I left out some of the information in the start, sorry and thanks for the input. Our engineer on the state side of the project (we were responsible for the pumps, commissioned on 3-27-07) noted that we should be getting 3.7 FPS at design flow of 522 and even with the slow down at 380...

We were hoping to go here (pigging) last but thank you very much for the link. The pigging may very well be our final shot. Would have been far nicer if cleanouts had been installed. Be intersting to see how this all turns out. A last tid bit for anyone reading this, we have two different...

Thanks Semo good info on why the valve testing may or may not work, probably not. Actually we did open our air release valve yesterday after some other work and found quite a bit of air. It was brought up that since the location of the air valve almost always has pressure on it (beacuase...

A forced main sewer was installed on my last job and is having some issues. The line is about 1.5 miles long and goes from pump station over a small rise and then drops lower than pump station into a draw and then goes up over another hill higher than pump station and then drops into a...