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Post by Jim on Aug 16, 2017 13:08:27 GMT
Hi James, good name that  I'm very reluctant to make any suggestions regarding the problem as I'd only be guessing. However I'm sure there are many here who have encountered a problem similar to yours James and would be only too happy to share their thoughts and experiences. Not much help I know sad to say. Jim. |
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Post by walcott11 on Aug 16, 2017 17:41:19 GMT
Ok Jim, thanks anyway, good luck with your project/s.
James.
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Post by Roger on Aug 16, 2017 18:12:15 GMT
Just a bit of feedback on an experiment with an Air Stone from a fish tank. I've attached one to the inside of a milk carton and done a little test which you can see here. You can see that even with water covering the stone, there's no natural tendency for it to flow when there's almost no head. As soon as there's 10-20mm of head, it flows freely, but my conclusion is that the pores are slightly too fine and the surface tension is just too great to allow it to flow. |
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Post by 92220 on Aug 16, 2017 18:54:08 GMT
Hi Roger.
That actually looked quite good. If the filter is on the bottom of the tender tank., it's highly unlikely that the water level would be allowed to get down to only around 20/25mm so those fishtank filters could well be the answer. A couple in parallel would double the flow rate too.
Bob.
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Post by Jim on Aug 16, 2017 19:01:45 GMT
Thanks Roger for going to the trouble to test the filter/aerators and supplying your conclusions and with which I agree. I've re read JJ's 'Britannia Builder's' blog and he encountered a similar issue with pneumatic silencers originally supplied with his kit. www.britanniabuilder.com/kit4.htm and described in his update for 7/6/08. From all the input it looks like a gauze filter is the solution. Jim |
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Post by Roger on Aug 16, 2017 19:04:20 GMT
Hi Roger. That actually looked quite good. If the filter is on the bottom of the tender tank., it's highly unlikely that the water level would be allowed to get down to only around 20/25mm so those fishtank filters could well be the answer. A couple in parallel would double the flow rate too. Bob. Hi Bob, It's certainly close, but I'd like to see it flow out without any extra head. Some of them may be coarser, but I have a feeling that they will all have the same attributes, because that's probably the way they achieve the even flow of air. If you could get them out if they didn't work, you could try them, but once they're in there on 1501, there's no going back. |
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Post by Jim on Aug 16, 2017 19:14:51 GMT
Hi Jim, I currently have a 3.5 inch Britannia that seems to have had very little use ie stuck regulator now freed off, however the off side vale appears stuck and not wanting to force it have you any ideas as to how to free it apart from a strip down . James. Hi James, I've sent you a PM with some suggestions that maybe helpful. Jim. |
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barlowworks
Statesman
Now finished my other projects, Britannia here I come
Posts: 878 
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Post by barlowworks on Aug 16, 2017 22:32:48 GMT
That certainly flows better than the round one I tried, probably because the material is thinner. I was just thinking there would be a degree of suction involved with the various feeds. Would that help in pulling the water through at a sufficient rate.
Mike
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jools
E-xcellent poster
Posts: 200
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Post by jools on Aug 17, 2017 5:19:45 GMT
While the idea of using air stones is a novel idea, I think their general purpose is not so much to filter the air per se as to break the airstream into smaller bubble to increase the oxygenation of the water in the fish tank. Air being less dense than water will have an easier passage and with the air stone having a smaller internal surface area may block up with water borne contaminants more readily than any airborne contaminants would.
Just my thoughts. |
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Post by 92220 on Aug 17, 2017 18:17:18 GMT
Hi Roger. That actually looked quite good. If the filter is on the bottom of the tender tank., it's highly unlikely that the water level would be allowed to get down to only around 20/25mm so those fishtank filters could well be the answer. A couple in parallel would double the flow rate too. Bob. Hi Bob, It's certainly close, but I'd like to see it flow out without any extra head. Some of them may be coarser, but I have a feeling that they will all have the same attributes, because that's probably the way they achieve the even flow of air. If you could get them out if they didn't work, you could try them, but once they're in there on 1501, there's no going back. Hi Roger.
How about this:
IMI Norgren T40 Bronze 10bar Pneumatic Silencer, Threaded RS Stock No. 822-4005. I had to chop the web address and wasn't sure if it would still work. It does. This is the web page for the filter: uk.rs-online.com/web/p/products/8224005 I found it by googling Sintered filters. There are lots to choose from.
Bob
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Post by jon38r80 on Aug 17, 2017 19:27:28 GMT
Would a sintered metal fuel filter like those used for model IC engines like these be a better bet. www.aliexpress.com/sintered-metal-filters_reviews.htmlas they are designed for fluids. Im sure I have seen their use as a water filters discussed on this or a similar discussion board |
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Post by 92220 on Aug 17, 2017 21:53:57 GMT
Definitely worth a try Jon.
Bob.
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waggy
Statesman
Posts: 747
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Post by waggy on Aug 17, 2017 22:20:31 GMT
A word of warning regarding aquarium air stones, I have them in my pond over the summer months to help with filtration. I take them out over winter as the fish aren't as active but find I have to renew them every spring as once they've been allowed to dry out I find they crumble a bit when they get wet again.
Waggy.
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Post by Cro on Aug 18, 2017 6:57:59 GMT
Hi Bob, It's certainly close, but I'd like to see it flow out without any extra head. Some of them may be coarser, but I have a feeling that they will all have the same attributes, because that's probably the way they achieve the even flow of air. If you could get them out if they didn't work, you could try them, but once they're in there on 1501, there's no going back. Hi Roger.
How about this:
IMI Norgren T40 Bronze 10bar Pneumatic Silencer, Threaded RS Stock No. 822-4005. I had to chop the web address and wasn't sure if it would still work. It does. This is the web page for the filter: uk.rs-online.com/web/p/products/8224005 I found it by googling Sintered filters. There are lots to choose from.
Bob
Bob, We had some of these at work in our air intensifiers and I tried running water through them and not a drop! Assuming they are the same thing of course but If they are its a big no. Adam |
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Post by Jim on Aug 18, 2017 8:15:02 GMT
That was the experience some friends of mine had and certainly my experience using a lovely fine mesh I'd been keeping for a filter only to discover it wouldn't pass water as it was fuel line filter gauze and designed to keep water out. Bugger!
Jim.
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Post by Roger on Aug 18, 2017 8:33:46 GMT
That was the experience some friends of mine had and certainly my experience using a lovely fine mesh I'd been keeping for a filter only to discover it wouldn't pass water as it was fuel line filter gauze and designed to keep water out. Bugger! Jim. Out seems pretty conclusive that there's a minimum pore/mesh size that you can't go smaller than else surface tension becomes too great. It looks like a coarse mesh is what's required. I'd be interested to know what the minimum acceptable pore size is. |
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Post by nick952 on Aug 18, 2017 9:15:47 GMT
To size the mesh, find the smallest gap/bore etc in the route that the water flow will take (this will probably be in the injector) and select a mesh that is no larger than this.
Nick.
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Post by Roger on Aug 18, 2017 9:30:38 GMT
To size the mesh, find the smallest gap/bore etc in the route that the water flow will take (this will probably be in the injector) and select a mesh that is no larger than this. Nick. That's not what I meant. Getting enough flow is easy as long as there's some flow, you just increase the area. Below a certain pore/mesh size though, there is zero flow at very low heads due to surface tension. I'd like to know what the critical pore/mesh size is. To my way of thinking, the ideal is the smallest mesh size consistent with enough flow. You surely don't want any particles bigger than absolutely necessary getting into the boiler. |
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jools
E-xcellent poster
Posts: 200
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Post by jools on Aug 18, 2017 22:31:42 GMT
I wonder what type of filters they use in the water jet cutters ? These would have to fall into that category as I would not imagine foreign matter would be acceptable in the cutting nozzle ?
Jools
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Post by steamer5 on Aug 18, 2017 23:23:34 GMT
Hi Jools,
Don't forget that the water cutter guys are putting garnet into the water stream so a little impurities isn't going to matter in the cutting nozzle, & given the pressure that they run the water side at I guess the impurities would have to be quite big to cause an issue.
Given all that my water blaster came with an external water filter, nice clear plastic with a white plastic mesh filter inside......now maybe that may be worth looking into.
OH just remembered when typing this that I saved the filter that came with the replacement water solenoid for the washing machine, think that too was plastic. Modern home tape ware have filters that screw in the nozzle's, mine are all stainless.....now were did I put the 2 wedge wire strainer's that I "acquired" about 15 or 20 years ago?
Cheers Kerrin
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