quote:

Originally posted by Farmerboy777:
Don't copper and brass cause a problem with bd? Going to try the construct my venturi today/wish me luck.

TexasCustom,
Post a picture so we can see what we are buying!!!

Hi farmer boy,

Good luck with your venturi and no bio has little effect on copper, Graham laming's system is 100% copper.

Hope it works.

Jim

I think the problem is only long-term storage in contact with brass and copper, which speeds polymerization. The relatively short period of time in contact during processing has no effect (as demonstrated by Graham.)

I'm working on one now, I'll post some pics when I'm done.

OK here it is, just need to drill the holes and finish soldering it together. It's made from 1 1/8 in. tubing (mashed out with a hammer for the tapers) with 1 in. FPT fittings on each end and then a piece of 1 3/8 in. tubing to cover it all up. Dual 1/4 in. feeds oppisite each other, I'll wye them into a piece of 3/8 in. The hole for the venturi is slightly larger than 1/2 in. Still trying to decide on what size/ how many intake holes to drill. I'll get that done tomorrow and hopefully have some time to test it.

IMGP2937.JPG (35 KB, 339 downloads)

And here it is together, but not soldered yet.

IMGP2938.JPG (31 KB, 261 downloads)

Hi Texascustom,

The angles of a venturi are quite critical to achieve an effective vacuum.
I would say by looking at your venturi that the inlet and outlet angles are too flat and the throat is too big in diameter. The positioning of the inlet holes is important as 1/2 a diameter one way or the other will have a great effect on vacuum
From what I see there are some serious hammer marks in the surface which means the inside is rather lumpy as well and will interfere with a smooth flow out.
I shall be very interested in your performance figures.
Best of luck with your testing.

I've attached a shot of my testrig drawing water up the vacuum tube to a hight of 16ft and i'm positive it would hit 20ft but I aint gona build a plant that high.

This message has been edited. Last edited by: Shaun,

jamesrl,

Them are some very good numbers!!! What size of pump are you using? When will our venturi had the stores? My first attempt failed but I will try another day.

It occurs to me that if you left off the outside jacket with the side tube; placed the whole thing inside the processor under the fill line; you would have a mixing nozzle that sucked tank contents in through the holes azound the throat; so increasing the mixing power of your pump without resizing the pump.

Hi Jim
Can you give exact instructions to construct the venturi?
Thanks

quote:

Originally posted by Farmerboy777:
jamesrl,

Them are some very good numbers!!! What size of pump are you using? When will our venturi had the stores? My first attempt failed but I will try another day.

Hi Farmer boy777,

When you say failed, do you mean failed to work or failed to make one? PM me with some shots of what happened, perhaps I could help point you in the right direction.
I have a Stuart Turner pump oa a 180watt Brooks Comptom motor approx 20gall 90lt/min.
Jim.

Ant,

I think know what you mean but I've never tried a venturi being sucked instead of blown.

Another answer would be to have a valve to switch from Meth carboy to a small secondary out let near the bottom of the reactor vessel and mix in a different part of the content.

Hi Yair-BHCF,

I have attached (just for you, so keep it to yourself and don't let anybody else see it, guard it with your life) a sketch showing how to make a two piece venturi. I can give all the information you need but I cann't give the experience and skill, that takes practice an patience.

Jim.

This message has been edited. Last edited by: Shaun,

quote:

Originally posted by Ant:
It occurs to me that if you left off the outside jacket with the side tube; placed the whole thing inside the processor under the fill line; you would have a mixing nozzle that sucked tank contents in through the holes azound the throat; so increasing the mixing power of your pump without resizing the pump.

Sorry Ant the penny has just droped. yep got it, a second venruti on the flow into the tank.

A good idea. On my testrig I use that same idea to stop any bubbles being created by splashing down and being drawn into the suction side of the pump as they have a dramatic effect on the flow rate of the pump and venturi.

If the input tube was adjustable it could be set for best results and the fixed in place.

Yep nice one Ant.

Jim.

Jim Thanks

Ant,
This is what you are looking for.
http://www.aquaticeco.com/index.cfm/fuseaction/product....il/iid/9846/cid/2953
it's called a tank mixing eductor and is going to revolutionize the way in which we make b/d. i have two of them in my new processor and the mixing power is nothing short of remarkable.i'm testing these to see if they hold up to b/d. if not then there are several companies that make them in carbon steel and even pricier materials.

quote:

Originally posted by Ant:
It occurs to me that if you left off the outside jacket with the side tube; placed the whole thing inside the processor under the fill line; you would have a mixing nozzle that sucked tank contents in through the holes azound the throat; so increasing the mixing power of your pump without resizing the pump.

This makes sense, but it would have to be constructed in a way that when the unit is turned off you don't get a reverse flow or a siphon back into the meth tank through the venturi.

Dave how could you?? It is just a nozzle inside the main tank. Not connected to the meth tank at all. As Jim says a second venturi designed to mix the tank up and as dude says its a tank mixing eductor. Or those motionless mixing nozzles that mcmaster carr have underneath the motionless mixing tees.

quote:

Originally posted by trtmntdude:
Ant,
This is what you are looking for.
http://www.aquaticeco.com/index.cfm/fuseaction/product....il/iid/9846/cid/2953
it's called a tank mixing eductor and is going to revolutionize the way in which we make b/d. i have two of them in my new processor and the mixing power is nothing short of remarkable.i'm testing these to see if they hold up to b/d. if not then there are several companies that make them in carbon steel and even pricier materials.

Are you using an appleseed? If so, how do you get such a large head through the smaller threaded opening. Did you use the upper heating element port? Did you use the smaller 3/8 inch threaded into a reducer coupling so that it would fit through the port and still be threated into the tank? Etc...? Looks like an excellent idea.

Could you post a few pictures.

Thanks,

Dave,
i was using an appleseed but am now using a 55 gal steel drum processor that has a removable lid with a lock-ring.

i'll post some pictures in the p.m. when i get off work.

quote:

Originally posted by Ant:
Dave how could you?? It is just a nozzle inside the main tank. Not connected to the meth tank at all. As Jim says a second venturi designed to mix the tank up and as dude says its a tank mixing eductor. Or those motionless mixing nozzles that mcmaster carr have underneath the motionless mixing tees.

Hi Ant,

II was responding to where you said

quote:

placed the whole thing inside the processor under the fill line;

If the supply line that enters the tank is completely below the fluid level and someone mistakenly puts the venturi that feeds the meth into the line below the fluid level as well, that could / would potentially lead to a reverse flow back into the meth tank when the pump is turned off and the vaccum disappears.

That is all I was trying to get at by my post.

That's how I could. ;o)

quote:

Originally posted by trtmntdude:
Ant,
This is what you are looking for.
http://www.aquaticeco.com/index.cfm/fuseaction/product....il/iid/9846/cid/2953
it's called a tank mixing eductor and is going to revolutionize the way in which we make b/d. i have two of them in my new processor and the mixing power is nothing short of remarkable.i'm testing these to see if they hold up to b/d. if not then there are several companies that make them in carbon steel and even pricier materials.

Shawn,

This is excellent. I did some reading about it I think this deserves it's own thread. You are right, this should change how people are mixing their BD.

Tank Mixing Eductor New Thread