SS Boilers

[Vossy1]

if you disconnect the output from the pump but leave the input connected and open does the liquid run through with that type of pump?

Yep, did that

make sure there's enough head pressure and run the pump against a shut/partialy shut valve, open and partialy close it a few times (as long as you're fittings are strong enough a centrifugal pump can run against a shut valve as it's designed to create flow and not pressure). If this doesnt work almost instantly this wont be the solution.

Did that too. The tube look like it had sucked a lemon
This did help to get rid of any remaining air

I even extended the hose and placed the pump beneath the tun, but to no avail.

My 6ltr/min pump is far more powerful than the 10ltr pump...just too noisy

And United lost...to a fabulous goal....a gr8 day in the Vossy household

[Seveneer]

I use copper pipe from the mash tun to the pump as I had a problem whith my initial plastic herms whereby the flexible pipe to the pump was sucked closed which is a bad thing. By using copper it fixed the problem.

I included copper for that run in the stainless system and have had no problems.

I use flexible hose from the HLT as there's a good head of water and just an open pipe between the water and the pump rather than 12kg of grain like in the mash tun.

Might be worth trying to cobble together a copper pipe from copper push fit connectors to see if it works.

/Phil.

[Andy]

All good advice, learnt the hard way!

[Vossy1]

More tseting just completed.

I ran the new Totton pump from reservoir to bucket all at table level with a pre primed pump. I also replaced my reinforced tubing with 1/2 clear tubing.

3 x runs, all at 10-11 ltr per min

I attached the pump to the reservoir and pumped through the heat exchanger to a bucket.

3 x runs, all at 4-5 ltr per

Opinions please,.....mine...

I think my pumps under rated. I don't think it can provide the force to make the flow increase through the 10mm bore heat exchanger.

I'm not sure what sort of litreage per min I need, but I know I need a pump with more power.

I know there is a way of working out the max flow from a tube of this bore, anyone know how to do it or what it is

Does anyone have any suggestions....7

[Vossy1]

I've just tested the 6ltr/min pump and it produced an output of....6ltrs with both free flow and heat exchanger.

It's odd that the smaller rated pump outdoes the higher rated pump.

Both pumps have a max pressure of 1.4 bar and I think this is the stumbling block.

I suspect I need a higher working pressure on my pump.

[Andy]

Both pumps have a max pressure of 1.4 bar and I think this is the stumbling block.

Doubt it Vossy - my Totton NDP35 has the same 1.4bar rating on the pump body, I think that's all about the max pressure that the body itself can withstand. The NDP35 is rated at nealy 30L/min with a 1 metre head, shame the Ebay seller I got mine from doesn't have any left

[Andy]

http://cgi.ebay.co.uk/TOTTON-GP-20-12-G ... dZViewItem

?

[Vossy1]

Think I've grasped it now whilst you were posting Andy.

It's not the working pressure I should be looking at it's the hydrostatic head.

On the graph for my pump DC15/5 I'm getting a flow rate of 6ltrs per min which equates to a hydrostatic head of 5meters...ish.

My pumps only rated to a 6m hydro head.

I'm assuming a pumps power is measured via the HH

Sound o.k

[Vossy1]

Hi DaaB and thanks.

You can soon find out, remove any restrictions from the outlet and conduct the test (sparge arms/return manifolds?). If you are getting the required flow rate, thats you problem.

Did that, see above

The heat exchanger is providing resistance to the pump and I need to find a way of increasing the flow.

If my set up is generating a HH resistance of about 5m then if I target a pump with a certain flow at 5m HH will that do the job....is that sensible logic.

Andy, strangely I e-mailed the Harmony Hut a couple of hours ago regards that pump

EDIT

Just tried both pumps pushing liquid through my cfc and same effect, with a rough 1 ltr/min drop on both pumps.

[Andy]

(imagine an H shaped manifold with the flow coming in at the center through a tee and at the end of the long sides of the H are 4 elbows facing up through which the wort is returned to the mash).

That's Phils return manifold that is

[Vossy1]

That's Phils return manifold that is

Beat me to it

The pump from the Harmony Hut looks ideal depending on model variant.

DaaB, based on my cfc experiment above, and my other follies, it's the heat exchanger that's providing the resistance.

I don't fancy changing that, and 7's 10mm HE works for him so it's the pump that's got to change....I think

[Vossy1]

Well Paul from the Harmony Hut has just got back to me and the pump is a March May MSP3.

http://www.marchmay.co.uk/files/Msp.pdf

Looking at it's HH flow rate graph it looks perfect.

[Vossy1]

Thanks for all the help DaaB and Andy....once again

[Seveneer]

I've been away for a couple of days. Is it all sorted now then Vossy?
/Phil.

[Vossy1]

Hi Phil, Not yet.

New pump on the way, fittings, tubing and a whole lot more patience

On a positive note, at least I've got 2 seperate pumps now