×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Large amount of suction lift - is this possible?

Large amount of suction lift - is this possible?

Large amount of suction lift - is this possible?

(OP)
Hello, We currently have a submerged multi-stage centri pump ~60m down a borehole pumping water in underground (~5m below surface) tanks. The water has a high Iron content and as a result, bacteria have caused havoc with the resulting rusty slime reducing the throughput of the system. A lack of maintenance is mostly to blame for the drop in pumping capacity, and subsequent 'quick fixes' by the maintenance team have been ill-informed and have made my job somewhat more difficult.

I would like to replace the submerged pump with one mounted on the surface, for easy access by our mechanics. This would require a suction lift of ~60m. Is it possible to achieve this amount lift? even with manual priming?

My aim is to provide a solution of both an easily accessible pump which can deliver the water at a high velocity, to try to reduce the biofouling on the line. If a pump with ~60m of suction doesn't exist, can you think of another option?

Thanks

V

RE: Large amount of suction lift - is this possible?

60m is too high for suction lift. The theoretical maximum suction lift is around 9m. Disinfect your borehole?

RE: Large amount of suction lift - is this possible?

(OP)
Chlorine/Hydrochloric acid completely ruins our product. I guess i'll replace the existing pump with a more powerful version and crack down on the maintenance team. Perhaps a Rapid sand filter or similar to remove the entrained sludge would be an option, at least then the downstream equipment will not suffer as much.

RE: Large amount of suction lift - is this possible?

If the pump is at water level, do you really have a 60m lift? I thought lift is from water level up to pump. You would have to be concerned about pressure drop, system loss, in the 60m suction line. Figure the pressure drop for the flow rate you will want to determine pressure at the pump intake.

Ted

RE: Large amount of suction lift - is this possible?

(OP)
If one did exist, the pump would be on the surface and the water 60m below the surface.

RE: Large amount of suction lift - is this possible?

Would agree that 60m is too high of a suction lift.

In addition, moving the pump motor to the surface is not going to stop the slime problem. In order to eliminate the slime problem, you will have to periodically disinfect the well. Some wells have the capability to feed chlorine into the well bottom continuously by installing a chlorine feed line attached to the well string.

Shock chlorination/hydrochloric acid treatment should be done only periodically, maybe annually. The well is flushed to waste after these treatments, so I don't understand why it should be affecting your process.

Addition of a multimedia filter will dramatically improve the water quality.

RE: Large amount of suction lift - is this possible?

If you can't tolerate bleach then look at using hydrogen peroxide to disinfect the system. You will only be adding water.
Watch out though, it does not have any persistence.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Large amount of suction lift - is this possible?

60m not possible. 0 atm is absolute zero so max lift is one atm (or as 77 puts it roughly 9m or convert to whatever units you would like)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources