Head pressure on forced mains

[RDHRS]

Problem: I'm in the AirForce stationed in Guam im incharge of the installin the water and sewer lines. Im running a 8" sewer line that is partialy a forced main. I am also ordering threw a middle man, so I dont really get to see the spec's on my parts comming in. I am trying to max my forced main but I dont have a clue how far a typical station will pump! the grade is .7% And I plan on a slope of 1/16"/ft I cant find any code against it however, the UPC advises it only in building sewers not exterior use.

can anyone shine a light on this?

 

[francesca]

I thought the military had a TM for every single thing in their inventory. You'll need to find the TM on your "typical station" because outside of the military there's no such thing. How far it'll pump depends on pump specs, elevation change, length of pipe, size of pipe, pipe material, etc., etc.

 

[Sdave999]

There is a lot of information needed to design a sewer main that incorporates forced (pressurized) and gravity portions within the same pipeline. You have the possibility of restricted flow due to pockets of air trapped in the gravity portion that can become pressurized during some conditions. This can cause what is refferedto as the "cannon effect" and cause all sorts of fun problems!

As mentioned by francesca above, you need this information to determine just what intererelationships are present in any pressure/gravity system.

This is a problem that can't possibly be "typed" out in a post!