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The pipe is AC pipe, we use the mechanical coupler to maintenance purposes.

Hi,,, I have a problem with the water pipes couplers bolts that located under ground in corrosive soil, what bolts is suitable in this case, and what unit-corrosion material should I use to protect them?

Thanx for every body... I'll read what u sent

Hi.... Please, how can I calculate the NPSHa for a pump? And, What is the deference between NPSHa and NPSHr?

It is water.... According to your replies, Hazen-Williams formula and Darcy-Weisbach equation are preferred.

Hi.... My questions is: 1-Is the three equations of calculating the head loss (Hazen-Williams formula, Darcy-Weisbach formula and Chezy-Manning formula) applicable all times in calculating the head loss? 2-If the pipe has many low and high points along the rout, how could I use these equations?

First point to the right is the feeding tanks Last point to the left is the end point

BigInch... Please check the attached pics..http://files.engineering.com/getfile.aspx?folder=635f6272-37e0-4a59-b957-b37d66ec4608&file=Water_Pipe_with_booster.bmp

BigInch,,, This is the rout of the pipe in google earthhttp://files.engineering.com/getfile.aspx?folder=daea8f39-1fe0-43d9-b287-86cf42d558e5&file=Pipe_Rout.kmz

I think if the discharge pipe was shorter, the booster will not need to pressurize the system as much as it do with the 6km.. To reduce the length of the pipe we have to put the booster at the nearest possible position to the end point(the water flow due to gravity for 1.5km in the pipe from the...

Thanks for everybody. Really your replays were useful. I have one last question, is the length of discharge pipe to long (6km)?..If it is, what is the preferred length?

what type of non returning valves is preferred???

I noticed that, after the pipe was pressurized after starting the pump for 3 hours and the water reached the end point, it does not required more than 16bar and may be less at the pump while it need 20bar when the pipe was empty. I think we need to install non returning valves to avoid blasting...

The pressure decreases as the elevation increases. First point after the pump = 16bar End = 1bar

Mr. Artisi Yes, I have 2 pumps. But they are not working at the same time. We operate one pump and we keep the other for emergency.

I don't thing there is an air blocking the flow, due to the number of air vents on the line.We put an air vent every 500m at every high point. Can we increase the flow rate??? The booster has two pumps of same specifications in parallel arrangement, each has Q= 6-14 cubic meter per hour.

It is not east to make a profile in that area. I talk some elevations (Sea level as reference) on the pipe rout Feeding tanks : 900m Booster : 847m Lowest point : 810m End Point : 964m

Mr. JJPellin We put a bypass line 20m away from the booster on the discharging pipe to the booster feeding tanks to control the pressure. I just came from the mountain area where the system placed, I set the pressure of the booster to 16bar and after 3 hours the water reached the end point. The...

Thanks,,, Downloading ...........

I don't knew what do you mean by toy pump It is booster pump 200m head in a mountain area