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Thread: Check your Y-fittings
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8th December 2012, 04:26 PM #1.
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Check your Y-fittings
A few days ago I was testing a DC filter and noticed the flow was a little on the slow side. (this is not the same DC I discuss in the Clearview Cyclone thread)
The 2HP DC with needle felt filter was (permanently) hooked up to a panel saw using about 3 m of 4" flexy.
At the DC the flexy was connected to one side of those standard black plastic dual or Y connector on the DC - see pic below.
I removed the flexy from the Y connector and found it was half blocked by a fat wad of sawdust jammed into the other side of the Y which was blocked of with the standard black plastic cap.
The wad of sawdust was so large it intruded well into the air stream from the panel saw. As soon as I removed the saw dust the flow improved back to what it should have been.
If you only use one of these 4" ports it's better to remove the Y-connector completely as the (even unblocked Y-connector) adds significant turbulence just in front of the impeller which affects the flow. Some inlets to these DCs are 5" in diam which is a non-standard size but a simple adapter could be made in a number of ways including
- using a tapered plastic flower
- turning an adapter out of MDF
- stretching on side of a 4" PVC adapter in hot oil.
If you have to leave the Y on for occasional use then checking it every now and then is a good idea,
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8th December 2012 04:26 PM # ADSGoogle Adsense Advertisement
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9th December 2012, 12:37 AM #2... and this too shall pass away ...
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Bob,
How common have you found blockages on 6 inch systems to be?
Assuming air flow and velocity are both good, what types of issues should we be aware of? (Verticals? ... long horizontals? ... and so on.)
Thanks.
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9th December 2012, 01:01 PM #3.
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I've only had my 6" system for about a year so I cannot claim a long experience - so far no blockages in the 6" sections but I still get them in the 4" sections of the ducting. Even on 6" ducting any vertical runs should either be left easy to dismantle or incorporate an inspection point at the bottom of a run.
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9th December 2012, 09:25 PM #4Senior Member
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I've encountered that problem - it's easily solved by removing the cap over the unused port on the Y connector. Or connect a hose to it and add it to the saw as well. Might as well try to capture as much as you can instead of wasting capacity.
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9th December 2012, 09:40 PM #5.
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19th December 2012, 12:33 AM #6
Any unused leg of a system (just like in Bob's example) or dropdown that has a blast gate closed will all potentially fill up with dust regardless of size, especially if there is dust coming from an upstream inlet, (a machine in use)
In those videos I did a little while back I had to have a gap at the side where I had the perspex cover to allow air in otherwise the upstream section of pipe from the inlet I was trying to show would just fill up with dust and blocked the view, the first one I did (I think) has the dust swirling right there at the perspex, this dust travels into the unused legs and just sits there, sometimes a little leak/hole can be helpful in keeping the pipes clear or make a habit of going around opening and closing unused blast gates at the end of the day to clear any sitting dust.
Pete
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19th December 2012, 08:49 AM #7... and this too shall pass away ...
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Thanks Pete
So far I have had no issues. However I tend to use all the lines (except the one to the drill press) nearly every day I am in the workshop. Also, it seemed like a good idea to follow your suggestion and run each line at the end of the day occasionally.
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