Local availability of parts and fittings and cost (and my knowledge) limited me to 4" instead of 6", but I've been pleased with the performance of my 2-run system on a Jet DC. As it expanded, and everything got hooked up and I added drops for future use, the number of blast gates near each tool increased, but that's about it.
I'd considered leaks but have been unable to find any in this hose and duct joints beyond that are sealed. I started trying to use it to add add a floor sweep on a flexible drop. Within seconds of turning the DC on, a sound like blowing across the top of a Coke bottle (remember those days? Doesn't work well with a can.) starts. It then gets louder and louder, reaching a maximum some 30 seconds (maybe) later. At the same time, the frequency increases. I don't have a dB meter, but it will reach 'Threshold of Pain' levels. Tried a bunch of different lengths using leftovers from a yard drain system I'd installed all the way up to a full roll in both 2(?) and 4 inch. Same thing, different pitch. FWIW, neither a 25 foot pool vac hose nor coupled ShopVac hoses do it.
At this point it became an experiment, and I even tried inserting various lengths between pieces of duct to see if breaking it up made a difference. No such luck.
I've got a lot of this stuff rolled up in the rafters and it would be nice to put it to use.
-J
On 9/16/2013 7:44 AM, Joe <Joe@Joe'sPlace.com wrote:
> I noticed some black flexible ribbed hose used in a dust collection accessories ad at http://www.rockler.com/product.cfm?page=11312&rrt=1 .
>
> I tried some stuff that looks like it that is sold as drainage hose. It is similar to http://www.lowes.com/pd_259812-62059-51110_0__?productId=1239335&Ntt=corrugated+pipe+4+inch&pl=1¤tURL=%3FNtt%3Dcorrugated%2Bpipe%2B4%2Binch&facetInfo= or http://www.lowes.com/pd_24136-124-04510050H_0__?productId=3306084&Ntt=corrugated+pipe+4+inch&pl=1¤tURL=%3FNtt%3Dcorrugated%2Bpipe%2B4%2Binch&facetInfo= .
>
> When used on a dust collector, the moving air across the ribs makes it sound like there's a steamboat whistle in the shop.
>
> I've tried different lengths and flows to get away from the resonant frequency with no luck. It only changes pitch.
>
> Has anyone had any luck with this stuff? The price on the clear stuff is outrageous and the wire makes it harder to work with. The black stuff curves easily and neither collapses nor shrinks under vacuum.
>
>
First off you should be using 6" diameter hose!
Past that you probably have a leak causing the whistle. I use the 6"
clear corrugated flexible hose, 30', witha 1100 CFM collector and have
no issue with the ribs causing a whistle.