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Centrifugal Pumps !!!!!!!

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Centrifugal Pumps !!!!!!!

Post by Admin on Thu Sep 15, 2011 9:57 pm

Troubleshooting the wretched things

http://www.maintenanceworld.com/Articles/engresource/centrifugalpumps.pdf



My Sequence 12,000 is venting `air` through the wiring box and running at a fraction of the phlow


HELP !

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Fri Sep 16, 2011 1:18 am

Could it be displaced air from motor cooling. Have you looked at the impeller, one of my pumps was slow and I found some K1 in there.

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Fri Sep 16, 2011 1:40 am

alank wrote:Could it be displaced air from motor cooling. Have you looked at the impeller, one of my pumps was slow and I found some K1 in there.

It could well be clogged given it has no strainer basket fitted Alan ...

I want to fit another pump while I dissect the Sequence though and wondered whether I might try the new Hailea (albeit double the wattage rate) Rolling Eyes http://www.ebay.co.uk/itm/160650312550?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_5634wt_1436

Iv`e had 3 pumps die on me recently. Evil or Very Mad

Is your Sequence plumbed below water level ?

The wretched RBD kept cavitating and would not prime the Pump until it was at ground level Twisted Evil which might have killed it or damaged it severely.


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Re: Centrifugal Pumps !!!!!!!

Post by alank on Fri Sep 16, 2011 2:49 am

I have that exact same pump. 210 watts I think, it works well. The sequence is below water level, or it will be when I refit it. I wanted to use it above but would have to prime it by feeding the discharge side from my shower feed pipe. Too much of a faff so it will take up the tiny bit of floor space I have left.

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Fri Sep 16, 2011 2:56 am

My sequence is 1/4 hp which I guess is 250 watt. It moves 18000 l/h against the 15020 l/h for 210 watts so compares quite well. Trouble is I may end up with 33000 l/h @ 380 watts, 15000 l/h @ 210 watts and 18000 l/h @ 250 watts. I will use the two smaller pumps on cheap rate leccy on Economy 10. Mind you I did have 14000 l/h @ 500 watts on my sand filter, lovely sparkly water but at a great cost.


Last edited by alank on Wed Sep 21, 2011 4:25 pm; edited 1 time in total

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Fri Sep 16, 2011 3:05 am

alank wrote:I have that exact same pump. 210 watts I think, it works well. The sequence is below water level, or it will be when I refit it. I wanted to use it above but would have to prime it by feeding the discharge side from my shower feed pipe. Too much of a faff so it will take up the tiny bit of floor space I have left.

Despite the Sequence 12,000 benefits (82 watts) compared with other Pumps ... they are `HELL`to Prime and prone to wretched `cavitation` Twisted Evil

I think I will go with the 20,000 lph Hailea for now as soon as Tina replenishes her stock which is the least expensive on ebay Arrow

http://www.ebay.co.uk/itm/170694747364?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_1950wt_905

It `s wattage usage is 310 .... approx 3p per hour Rolling Eyes

I`m not even going to attempt working out the cost of the `Elecro` 3KW heater .... phar too depressing IMO Laughing

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Sequence Pumps !

Post by Admin on Mon Sep 19, 2011 1:39 am

Well Guys I am MYSTIFIED by the `AIR` leaking phenomena from the power supply box on top of the Sequence No

It is also making a whirring type whisper noise instead of it`s previous pumping motor sounds and has stopped sucking `AIR`and pulsating ... IF that makes any sense to you Lovely lot Rolling Eyes

I`m anxious to get to the root of the problem though given these Pumps run at less than 1p per hour and some suggest are virtually indestructable Shocked

http://www.evolutionaqua.com/acatalog/tm_Sequence_Pumps.html

When I return the water directly from the pump it flows more efficiently until it is once again re-connected to the heater/sand filter/UV and on to the Giant TT scratch scratch scratch scratch scratch scratch scratch

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Mon Sep 19, 2011 6:15 am

Buy them from here before they realise they are selling them too cheaply. £120.. cheaper for the 18000


http://www.koibitz.com/scripts/prodList.asp?idCategory=283

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 4:13 am

If I hard pipe the RBD with the white pipework and a 45 degree elbow .... can I then use a hosepipe to fill the length of pipe prior to fitting it to the new Hailea pump to prime it Question

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Wed Sep 21, 2011 5:46 am

if using pressure pipe, why not fit a straight connector in the discharge side, drill and tap it 1/4 bsp, screw in a tap, have a hose pipe connector on the other end, plug hose in, open tap, fill pipe, start pump, close tap.

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 5:54 am

alank wrote:if using pressure pipe, why not fit a straight connector in the discharge side, drill and tap it 1/4 bsp, screw in a tap, have a hose pipe connector on the other end, plug hose in, open tap, fill pipe, start pump, close tap.

Please keep in mind how `Gizmo Challenged` this DIY DID is Alan ... Embarassed

Do you have a link for such a tap and said straight connector ? and will it self seal once screwed in please Sweetie Question

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Wed Sep 21, 2011 6:02 am

I can do it for you and send it on, do you have a link to the pipe you use?

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 6:36 am

alank wrote:I can do it for you and send it on, do you have a link to the pipe you use?

I have several 51 inch lengths of Floplast 1.5/43mm od with a code BS EN 1455 KM 548614 B left over from re - plumbing the Kitchen sink which I`m unsure will be long enough at a 45 degree angle to reach the pump ....

Is the White plumbing pipe strong enough Alan ?

The RBD will take 2 inch hard pipe BUT ................... http://www.koidirect.net/portable-retro-bottom-drain-prod-1094.html

The Hailea 20,000 won`t take 2 inch pipework I don`t think scratch

The centre of the show vat is 4 ft in so possibly I need a five foot length or longer ....








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Re: Centrifugal Pumps !!!!!!!

Post by alank on Wed Sep 21, 2011 6:52 am

Not sure about the pipe you have but all you need is a 2" to 1/2" reducing bush. If you buy new pipe its easy to do, you could do the whole thing for about £15 from http://www.1st-direct.com/2-pipe_pool-plumbing_swimming-pool-plumbing_pool-products_pool_pools_1.htm

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 7:10 am

alank wrote:Not sure about the pipe you have but all you need is a 2" to 1/2" reducing bush. If you buy new pipe its easy to do, you could do the whole thing for about £15 from http://www.1st-direct.com/2-pipe_pool-plumbing_swimming-pool-plumbing_pool-products_pool_pools_1.htm

So I need to buy 2 inch hard pipe and elbows plus a 2-1-1/2 inch reducer for the pump end but what about the `tap` bit to fill with the hose .... I wouldn`t have a clue how to do that or where along the pipework it should go Alan Embarassed scratch

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Wed Sep 21, 2011 8:06 am

Where does the pump discharge to?

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 8:12 am

alank wrote:Where does the pump discharge to?

Do you mean `return` to the vat Alan ?

RBD to pump to sand filter to uv then on to Giant TT ....

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Re: Centrifugal Pumps !!!!!!!

Post by alank on Wed Sep 21, 2011 4:38 pm

Your sequence or Halea will not be powerful enough to push the water through a sand filter, that is if your sand filter is a normal one, ie same shape as a bead filter. That would explain why the sequence will work without the filters attached. My sand (or in my case glass) filter has a 0.75 hp pump and creates a lot of pressure to overcome the back pressure created by the glass media. I have the 24" filter with glass media and a 0.75 hp pump which delivers 14000 l/h
http://www.1st-direct.com/peraqua-side-mount-filter-38;-pump-with-glass-media-kits_details.htm

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Re: Centrifugal Pumps !!!!!!!

Post by DaveB on Wed Sep 21, 2011 5:56 pm

Mio I agree with Alank regarding the above pumps. However depending upon what you have in your sand filter ie K1 or beads Then Lowera 0.36W should be OK. I ran a BB3 and a trickle tower on this pump for 10 years. Good luck Dave

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 6:07 pm

Guys Smile

Thank`s for all your help here Smile

The Sand Filter has been converted to K3 loosely filled Arrow and the flow reversed Arrow http://mio-chichi.forumotion.co.uk/t4-sand-filter-conversion-4-dummies

The Sequence initially pumped through everything at full throttle but will not now...

Might there be a blockage somewhere ... the K3 possibly Rolling Eyes

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Re: Centrifugal Pumps !!!!!!!

Post by DaveB on Wed Sep 21, 2011 6:38 pm

Mio

I ran a sand filter with K1 in it for a year. When I removed the K1 I found a lot of sedement in the bottom. I Even had an air pipe in there for cleaning the kK1, but still managed to fill up with crud.However I did not reverse the flow.

Because of the K!/sediment lieing under the spider/pipework on the bottom. I decided to abort the use of it. One of my projects which I did not think worked for me. Having ran a sand filter for many years, It is now safe to say I am not a big fan.regards Dave
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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 6:49 pm

There is no pipework on the bottom Dave .. and I can back-flush and open the drain tap below the egg-crate grid and flush there to ....

If it stays dry this morning I could try by passing the Sand Filter direct to UV to see if the Sequence pumps at full throttle again ....

The sequence has to pump UP two feet to the Sand Filter ... would that make the back pressure situation worse ?

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Re: Centrifugal Pumps !!!!!!!

Post by DaveB on Wed Sep 21, 2011 8:31 pm

Hi Mio

That looks like a better design sandfilter than the one I had.Bypassing the sand filter should prove wether or not you have a blockage. Good luck. regards Dave

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Re: Centrifugal Pumps !!!!!!!

Post by Admin on Wed Sep 21, 2011 9:10 pm

With my left wellington boot now FULL of Pond Water Rolling Eyes NO better flow when bypassing the Sand Filter Guys scratch but water was gushing out of the UV which is bizzare given it feeds a TT scratch Forgot to mention the Heater is fed from the Sequence first at full phlow Smile but every appliance after that the phlow is restricted Twisted Evil

What now ?

Alan was your pump situated post Sand Filter ? and why would the 20,000 Hailea not be sufficient Sweetie ?

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Update !

Post by Admin on Wed Sep 21, 2011 11:00 pm

I removed the RBD and used the 1.5 alfagoma to re-prime the Bl**dy Sequence which is almost at full throttle again via the UV....

I plan to do a 50% water change and leave the Sand Filter disconnected until I have the new fittings to re-plumb it all....

Which order will be best Guys ?



Last edited by Admin on Thu Sep 22, 2011 12:14 am; edited 1 time in total

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