Use of Victaulic Fittings for Dust Collection

[YoureInTheMixer]

Hi,

So I have been working on a problem where a dust collector pipeline has a newer elbow that has worn out (has large holes through it). The elbow is a Victaulic no.10 90 deg grooved elbow, but I am wondering if the use of these victaulic fittings for abrasive dust collection is normal? The dust is iron, so quite abrasive, and the velocities through the inlet/suction (where the elbow is located) is high (about 62ft/s). Are victaulic fittings normally used for dust collection?

The other reason I was speculating was that maybe there is not enough straight length of pipe from the suction point (hood) to the elbow, as the dust goes through the elbow almost immediately after the hood.

Thanks!

 

[Compositepro]

I have never seen Victaulic fittings used for dust collection. They can only be used with thick walled pipe, which is not usually used for low pressure "Dust collection". However, what you need is a "hammer elbow" .

SMART ELBOW® Deflection Elbows for Pneumatic Conveying Systems

SMART ELBOW® Deflection Elbows prevent material from impacting the elbow wall, preventing abrasive wear, material breakage/dusting/build-up and plastic streamer formation

www.hammertek.com

 

[LittleInch]

What isn't normal is that you're sending abrasive dust through at 20m/sec.... Victaulic is only a jointing system.

 

[Stick.]

Is the iron dust you're dealing with combustible or explosive? That could explain the high velocities (to keep dust from settling in duct), and could also affect what you're able to do as far as repairing the elbow or changing the design.

 

[YoureInTheMixer]

Is the iron dust you're dealing with combustible or explosive? That could explain the high velocities (to keep dust from settling in duct), and could also affect what you're able to do as far as repairing the elbow or changing the design.

The velocities are high to prevent settling, I am really just wondering if the reason the fitting is wearing out so fast because of the fact that Victaulic fittings are not suitable for dust collection.

 

[YoureInTheMixer]

What isn't normal is that you're sending abrasive dust through at 20m/sec.... Victaulic is only a jointing system.

For dust collection systems that deal with larger particle sizes (i.e. like this one), 20m/s or 3500fpm+ is perfectly acceptable to prevent settling according to ACGIH. I am just wondering if the reason the fitting is wearing out so fast because of the fact that Victaulic fittings are not suitable for dust collection.

 

[LittleInch]

Like I said - Vactaulic couplings are just the coupling mechanism between tow pipe ends.

The issue is the bend and the erosion of the elbow. Victaulic pipes and connectors tend to be quite thick to allow for the groove in the pipe body.

Most changes of direction where you have an abrasive material either need very hard coating (ceramic, very soft coating (rubber) or use of a swept elbow and a blinded tee, sometimes called a target tee. A normal steel pipe at an unknow radius will wea rout on a regular basis.

A no 10 elbow looks to be ridiculously tight and a sharp bend (1.5D?) It is no surprise to me that it wears out. You say "new"? What was there before?

https://assets.victaulic.com/assets/uploads/literature/07.01.pdf