putting in a loop ,cant seem to get the air out , been deadheading dosent sem to be working. been flushing for about 9 hours ive got a 2 hp flushcart capable of 80 ft of head . but cant seem to get the air out . any ideas

We have a second 2 hp pump that we put in series for the really tough loops

woe really , i think the problem is the loop goes uphill of the flush cart 30 to 40 feet . i shut the loop down at the flush cart and trying to let it setle , going to try again tommorow . may have to try your sugestion if it doesnt work tommorow

Use a pump with a much higher pressure rating.

Speculative: use a large pressure tank for a sustained burst that exceeds the pump gpm capability. And try both directions.

Really crazy: put a vacuum pump on it and remove the air (and water) that way.

Do you have a way of reading head pressure on your pump while it is running? I have seen my fair share of pumps that are no where close to being on the chart after seeing some rough service. I have also seen debris in the impeller cause a reduction but not failure in a circ pump. Verify your output data before you spend. Good luck!
Eric

How would you verify the head coming from the pump . ?

I would like to know , I just bought this flush cart but it was used a few times before I bought it .

Posted By geo pup on 15 Nov 2011 08:37 PM
How would you verify the head coming from the pump . ?

Head is another way to describe fluid pressure.  Just install a pressure gauge on the pump discharge side.

ive got one on the return side before the shutoff ,wouldnt that show the same thing while pumping ?

You need to verify pressure when pump is running at the dishcharge of pump and on the return side. On the discharge side yoU verify the pump, on the discharge you verify the loop. You can also dead head the pump briefly to observe its max capacity.
Eric

have you slammed the return shut to watch for fluid level bounce to rule out a kinked loop?

What are you seeing that indicates you don't have the air out?

You mentioned elsewhere the loops are in series, there is no reason you shouldn't be able to flush that even with a garden hose.

Geodean = the leval in my flush cart tank drop about 10-12 inches when i deadhead the return thus compressing the air in the loop , i have shocked the system by slamming the pressure to over 100 lbs on the gauge on my return line , and i have done this constantly for two day , i am rigging my pool pump from my home in line ,on the loop supply between the flush cart and the supply side of my loopfeild . hoping to increase the head of my pump by putting two pumps in series what do you think

are the loops really in series? If so you have a real problem.

If not, then you still have a problem. I think Joe might be right about the linked loop.

I don't think another pump is going to help you any.

I was asked to consult on a job today where when I arrived a competitor announced the problem was clear- when head side hose was detached and dumped in the resevoir it came out like tap water. Moral: check your equipment.

geo dean = i think i may be going brain dead , i went back and checked EVERYTHING in my design and pics of job . came to a conculsion . im a idiot , the system is piped in reverse return parallel system . not series . the flushing requirements on my pressuredrop softwere say 34 gpm at 154 lbs of head , my flush cart i dont think can do that much head so i will have to incrase head somehow

Mmmmm
Verification of baseline data.
Glad you found the issue, let us know how it turns out.
Eric

Can you tell us the layout of your loops?

How many loops, what length, what size of pipe?

4 trenches straight out ,300 foot long , 2 circuits in each trench , total of 8 circuits . 4800 ft of 3/4 piping , 214 ft of 1 1/4 header supply and return . System is piped in parallel. Headers are balanced headers from geothermal supply company . Circuits are piped in first out last in