High Suction Lift Pumps for sampling
High Suction Lift Pumps for sampling
(OP)
Dear All,
I am looking for a type of sampling pump (about 100 L/hr) that has a high suction lift of about 9m (Already considered all the loses).
As far as i know that some peristaltic pumps can achieve such a high suction lift. Is there any special types/alternatives of pumps capable of handling high suction lifts? besides having a vacuum pump.
Thanks
I am looking for a type of sampling pump (about 100 L/hr) that has a high suction lift of about 9m (Already considered all the loses).
As far as i know that some peristaltic pumps can achieve such a high suction lift. Is there any special types/alternatives of pumps capable of handling high suction lifts? besides having a vacuum pump.
Thanks





RE: High Suction Lift Pumps for sampling
RE: High Suction Lift Pumps for sampling
What is the vapour pressure and density of your product at sampling temperature?
What is your elevation above sea level?
Is the liquid exposed to atmospheric pressure or some other pressure
Anything close to or greater than an SG of 1 will be very difficult to source if you have to prime this. Without this information it's very difficult to advise.
Can you assume flooded suction at all times?
Or can you assume a vacuum pipe for initial fill?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: High Suction Lift Pumps for sampling
What is the vapour pressure and density of your product at sampling temperature? (Density 1030kg/m3, 2.4kPa, Seawater)
What is your elevation above sea level?
Is the liquid exposed to atmospheric pressure or some other pressure (about 7m elevation difference, atmospheric)
Anything close to or greater than an SG of 1 will be very difficult to source if you have to prime this. Without this information it's very difficult to advise.
Can you assume flooded suction at all times? (no)
Or can you assume a vacuum pipe for initial fill? (yes)
the installation will be something like that. The elevation as written above
_____Pump Ground Level__+1.7m(elevation)_
|
|
|
|Lowest Seawater level -5.3m(elevation)
|
Bottom of sump
RE: High Suction Lift Pumps for sampling
for an ambient temp seawater solution that would give you an NPSH of around 2 - 2.5m
That's quite low but there are a number of pumps which can achieve that, though you might need to fit an inducer to the front end.
So long as you can prime the system with your vacuum line then you have a wide choice of pumps.
Can't quite see why you don't use a submersible pump or a vertical pump.
You probably want to avoid any sort of pulsating pump so if PD type then screw or gear would be best as opposed to piston or AODD.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: High Suction Lift Pumps for sampling
Look at airlift of some type for the eye-dropper amount requirements of 0.0277l/min.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: High Suction Lift Pumps for sampling
I think they may be better off installing a EASTERN CENTRICHEM centrifigal sampling pump at some intermediate level so that it is flooded at all times. With the larger pump, the sample can be pumped at a greater rate in a larger diameter pipe loop and discharged back to the source. Tap off that discharge pipe with a needle valve to get the desired sample. This will really improve the lag time. I think it may be more practical also
http://www.pulsa.com/products/pumps/eastern-series
You can even get a sumbersible sampling pump with a VFD on it
http://www.geotechenv.com/pdf/ground_water_samplin...
RE: High Suction Lift Pumps for sampling
Small laboratory/pharma hose pumps are also a possibility.
And some small magnetic coupling gear pumps have small NPSHr (but I would recommend a foot valve with strainer as these pumps do not have any solids passage...
…although ‘QualityTime’ may be right and it has no point on taking a sample there. What about submersing the analyzer or probe? I assume ‘Nicwong7’ thought about that, but just in case!
RE: High Suction Lift Pumps for sampling
I thought it was 100l/min - misread.
But its 100 litres per hour = 1.66 l/ min (0.37 gals/min)
That makes it 0.027 litres / SEC
Agree it's quite low speed but if it takes a while to get a sample, that's the OPs problem
We have no idea why they want a sample, how often they want a sample, what the diameter of the suction lift is ( it's only 7m to pump base level remember, not 9m)
LI
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: High Suction Lift Pumps for sampling
RE: High Suction Lift Pumps for sampling
Mike Halloran
Pembroke Pines, FL, USA
RE: High Suction Lift Pumps for sampling
Here is a bladder pump that will do the task:
http://www.solinst.com/products/groundwater-sample...
RE: High Suction Lift Pumps for sampling
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: High Suction Lift Pumps for sampling
The sampling is done continuously feeding into the online instruments, it is an online monitoring to measure certain parameters of the feed water before misc filters downstream etc.
It takes about 2.5 minutes to get the sample. As the flow is very small, it is sized at an inch Pvc.
True that suction lift is only 7 to 7.5m + some pipe losses. Though i was thinking of a safety buffer and rounding up resulted in 9m suction lift as a design data for the pump supplier. Might be too much.. But thanks for the input @LittleInch, will look into that.
For pulsation type, we considered using peristaltic pump. We managed to find a supplier which guarantees 9.5m suction lift and with a dampener at the discharge line. What do you guys think?
Did consider submersible pumps as a solution at first, however, due to the location and the maintenance of this pump. Still preferred it to be on ground level.. Having said that, @QualityTime that GeoPump submersible pump seems quite interesting, might be feasible. Didnt know that there are such kind of submersible pumps available.
I guess i may look into some PD- screw pumps that some have suggested.
RE: High Suction Lift Pumps for sampling
For extra insurance, run a small rigid tube up the inside from near the bottom to a radial port near the top, cap the top, and pressurize the caisson with plant air regulated to a pressure equivalent to ~10m of water. If water spits out of that vent, you've got a leak down there somewhere, and some time to fix it before the pump gets wet.
Mike Halloran
Pembroke Pines, FL, USA
RE: High Suction Lift Pumps for sampling
I mean this is a very small flowrate and warm aerated seawater eats most steels so you end up needing brass or something which doesn't corrode.
Just go for simple.
Even these are 10 times the flow you need so maybe run a sampling loop and return most of it back to sea after a pressure valves?
http://www.asap-supplies.com/pumps/washdown-pumps
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: High Suction Lift Pumps for sampling