Spray Nozzles and Systems for the Pulp and Paper Industry
"Brush & Flush" spray headers, a.k.a. "Stamm Showers" were originally designed decades ago for pulp and paper mills. In paper mills the push towards recycling resulted in mills trying to spray reclaimed "industrial" and "white" water. As we know, particles and spray nozzles don’t mix - the potential for plugging nozzles and getting growth inside the headers is enormous. It used to be that the only solution was to strain the fluid prior to re-spraying it by installing sophisticated strainer systems.
There is nothing wrong with strainers, it’s one of the product lines that our sister division specifies. But when one takes a systems approach and chooses the right nozzle header it minimizes the amount of straining required. Strainers with larger mesh openings do not need to be maintained as often.
So how do they work? To begin with the nozzles themselves are very different for a typical flat spray nozzle. Most flat sprays have a "V" milled across a hole and it’s the "V" that creates the flat spray pattern. The resulting hole is elliptical in shape and is usually described as being in the shape of a "cats eye".
Here’s how a nozzle usually plugs-up, even when the fluid is filtered:
Particles in the fluid stream tend to settle in-between nozzle ports because these are areas of lower velocity and turbulence. Eventually even small particles that would pass through an orifice will clump together until they gain enough mass to "roll" into the orifice. Since the free passage is less towards the slit ends of the elliptically shaped orifice, that’s usually were a clog begins. From there the clog grows, eventually blocking the entire nozzle.
And the process continues, as each nozzle plugs, the solids in the fluid become concentrated and the other nozzles plug-up even faster in succession. Straining or filtering the fluid helps matters, but that’s often not practical for mills that require large volumes of fluid.
By observing the spray header one can usually see if the nozzles are totally or partially plugged. A quick and simple rotation of the hand wheel cleans the pipe and nozzles, flushing the particles through the discharge valve. This is a safe, efficient and effective way to clean your nozzles while you keep spraying.
Special "reverse orifice nozzle" allows the internal brush to sweep through the orifice and dislodge foreign material that may be impeding the spray. The spray tips are self-aligning to ensure proper overlap and coverage every time.
Brush and flush shower headers provide a way of keeping nozzles clear without shutting-down the process. The internal brush-rod design provides better cleaning than trying to scrub the outside of the nozzle. For one, scrubbing the outside of a conventional nozzle can damage the orifice, effecting its' performance. But, more importantly, clogs often begin by particle accumulation inside the spray header between the nozzles. Fluid travels through the nozzles at a higher velocity than it does in-between them. The result is a tendency for particles to cluster together, eventually getting large enough to "roll" into the orifice and clog the nozzle.
An important feature of Stamm Showers are that the brushes are indexed to ensure that nozzles aren't blocked when cleaning is complete.
Our headers are designed to either flush out through a discharge line or directly into a spray box – whatever suits your requirements the best. When we supply them with Victaulic Couplings it provides the ability to swivel the spray headers for maintenance or "fine tuning" of spray impact.
As a result of using these headers, strainers can be sized with larger perforated screens and therefore will have to be maintained less frequently.
Brush and flush spray headers have a low profile, are easy to install, increase reliability of your sprays and decrease maintenance costs/time. They pay for themselves very quickly.
DON'T BE FOOLED BY IMITATIONS!!!!!
Our headers are designed so that when you're done with rotating the handwheel, THE INTERNAL BRUSHES WILL NOT BLOCK THE NOZZLE ORIFICES.
Our headers can be designed to flush-out "in the box" or over the strip and if a hole needs to be made in the mill housing then you'll only need one hole.
Victaulic Couplings can be supplied to enable independent swiveling of nozzle orientation and the feed line. This makes maintenance easier and allows you to fine-tune where the spray impacts.
All of our brush and flush spray headers are constructed of 316 stainless steel.
As with most of the products we supply to mills, contact us with your requirements and we’ll schedule a visit to your mill. We can usually perform a thorough evaluation within 30-90 minutes and provide you with a written proposal in just a few days.
There's more...To receive more information click-on our "Nozzles for Pulp & Paper Mills" brochure below or CLICK HERE TO FILL OUT OUR INQUIRY FORM AND RECEIVE A QUOTATION.
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