Thread: Plumbing and my Dusty

Originally Posted by Waldo

G'day,
Does a wye work more effectively with the two run offs for the wye in a horizontal mode? Or does it not mater either way if it's vetical or horizontal?

A horizontal wye (45o) and then a 90o down drop to your BS means a 135o turn for the air stream

A vertical wye turn of 45o, means you just need another 45o turn to reach the 90o turn for a vertical drop to your BS. This should theoretically give you a very slightly better performance.

From a practical viewpoint and having tried to measure this effect with an airflow meter, vertical or horizontal orientation won't matter much.

What BobL said. In theory yeah, in practice no... unless you're right of the verge the system's limits anyway.

IMHO it makes more difference to have a short length of straight, about 3', between each change of direction to let the turbulence even out a bit before it hits the next.

(I wish I'd listened to my own advice. )

Skewy

RE: IMHO it makes more difference to have a short length of straight, about 3', between each change of direction to let the turbulence even out a bit before it hits the next.

For a lowish pressure system, like a standard 1HP dusty, I could not measure the "best to have straight bit after change of direction effect" to within about a a 3% tolerance. For a higher pressure system it might be possible to detect. I must get my 2HP unit out of its box and set it up and see if I can measure this.

BobL

I haven't measured mine, but my mains runs directly over the TS which hooks up through a vertical dropper to a 90° bend that's straight onto a "flat" 45° wye in the main. My BS, on the other hand, is a few feet away and the duct is a similar setup except there's a 6' straight between the wye and the 90° bend.

Now, when ripping, I'll sometimes swap the BS/TS positions (and ducts) to give me some elbow room and it appears to me that the TS duct just isn't as effective as the "usual" BS duct, even thought it's a shorter run.

Mind you, it could also be 'cos when I set up for a ripping session the timber is usually green... which I imagine would make a difference. Without accurate metering, it's hard to be empirical about it.