Ingenious Design: Why I continue to be a Warthog Fan

I’ve often referred to the Warthog sewer nozzle as the closest thing to a “Secret Weapon” in our industry and there are many among you who I know heartily agree with me on this.  I was first in my region to tout the merits of the Warthog nozzle and despite early objections “You want how much for this nozzle???”, today the StoneAge Warthog nozzle is widely regarded as the gold standard for performance and value, with countless agencies using it as their standard sewer cleaning tool.

Here’s a primer on the truly ingenious design that goes into every Warthog nozzle, and why I continue to be such a rabid fan of the top Warthog sewer nozzles.  There are three characteristics, which are relevant:

Characteristic #1:  Available Total Cleaning Energy (or ATCE) is expressed as a percentage of the total energy input to a nozzle.  Simply, it is the total amount of water that enters the nozzle, at any given pressure and flow.  Together, these factors deliver energy and it is this available energy delivery to the cleaning task, which we care about.

In a typical spinning nozzle, there are a number of jets dedicated to the cleaning function and a number of jets dedicated to the propulsion function – or moving the nozzle forward in the sewer pipe.  If you look at the non-controlled rotation nozzles, the spinning nozzles we sometimes refer to as “buzz bombs” for the sound they make in a pipe, we typically find designs with 3 or 4 or more jets, which are dedicated to propulsion and another 4 or so, those on the barrel or the part that spins, which are dedicated to cleaning.  If there are 4 thrust jets, and 4 cleaning jets, then it can easily be demonstrated that somewhere around 50% of the potential energy of this nozzle design is dedicated to propulsion.   Of course we should look at the size of each jet to get a truly correct measure of this split in task, but humor me for the moment; some portion, a large portion, of the total energy forced into such a nozzle is not used for cleaning.  Can I get agreement on this point?  If we disregard orifice sizing for the moment, it might be a simple calculation to determine that such a nozzle has a 50% ATCE value (4 of 8 total jets in the nozzle = 50%).

The Enz Bulldog, a recent entrant into the controlled rotation nozzle marketplace, has 13 total jets, 6 of which are dedicated to propulsion.  That leaves 7 jets which may be available for cleaning, therefore 7 divided by 13 = 54% ATCE.  The Primus by Sewer Equipment Corporation is similarly configured.

Only the patented StoneAge Warthog design allows for its jets to serve as BOTH cleaning jets and propulsion jets at the same time.  100% of the water that enters this nozzle comes into contact with the sewer pipe wall in a cleaning function.  The fact that propulsion is also generated by the cleaning jets is a by-product of the ingenious design.  Remember this; in the 1” class as example, the StoneAge Warthog has 5 jets and all 5 are cleaning jets.  This equates to 100% ATCE, the only sewer nozzle which remotely approaches such an exceptional performance value in this category.  Which tool would you rather have in your arsenal, one that loses as much as 50% of its available potential energy, or the one that preserves 100% of the available energy and puts it to the task?

Characteristic #2: The power of a nozzle jet may be computed by the formula for Impact Force (in science is sometimes referred to as Impulse, we’ll call it simply Cleaning Power or Power for short),  Power = Mass times Velocity, or P=MV.  If physics was never your strong suit think of it this way; if you saw a huge running back headed toward you at open field, breakaway speed, would that intimidate you more or less than if you were about to collide with a skipping child?  Get the point?  Both size (mass) and speed (velocity) combine to create Impact Force or Power.  So how do we apply this law of physics to the cleaning capability of a sewer nozzle?  Velocity of the water in a jet is dependent most significantly on the pressure delivered by the pump.  If we use the same pump, operating at the same pressure, velocity won’t change much from one sewer nozzle to the next.  So for purposes of this example we will assume velocity is a constant.  Then the only way to increase the power of a single nozzle jet is to change the mass or the amount of water coming through that jet.

Can you see that a greater or lesser amount of water with increase or decrease the mass of the jet, thereby increase or decrease the power?  Going back to the examples above, if we have a nozzle in which all the water is divided into 13 jets, how big can each jet be?  Conversely, if your sewer nozzle has 5 jets, can it be seen that those 5 jets must be significantly larger than each of the 13 in your competitor’s nozzle?  Remember this simple rule: More jets = less power per jet, fewer jets = more power per jet.

Characteristic #3:  The Warthog’s controlled rotation feature.  A spinning nozzle that is unregulated, will spin somewhere in the 5,000 rpm range.  Such a sewer nozzle will have jets which contact the wall of an 8” pipe at about 300 miles per hour!  The Warthog spins at approximately 300 RPM, which translates to a jet path travel speed of about 15 miles per hour.  So however short a time span either jet path crosses a specific spot on the pipe wall, can you see that the slower jet will spend more dwell time on that one spot?  How much more time?  Without calculating nanoseconds, we can easily make a comparison.  15 miles per hour divided into 300 miles per hour = 20 times.  It turns out the uncontrolled jet is traveling 20 times faster that the controlled rotation jet.  Therefore, the controlled rotation jet will spend 20 times more contiguous time on any given spot on the pipe wall.  Controlled rotation is desirable because a jet that travels along the pipe wall more slowly spends more time on any given spot on the pipe wall.  We call this “dwell time”. Remember this: We reasonably assume that a greater dwell time will deliver better sewer cleaning capability.

Summary: No other sewer nozzle, in my experience, has seen such a meteoric rise in adoption and such wide acclaim.  So the competition would do well to secure a piece of the Warthog nozzle’s following.  Recent competitive offerings at much higher pricing have emerged in an attempt to garner a part of the Warthog nozzle market share, but IMHO (In My Humble Opinion) they have only highlighted the “value” of the Warthog.   Despite their higher pricing, I have yet to review a competitive offering which can stack up in the three important areas in which the StoneAge Warthog reigns supreme; Available total cleaning energy of 100%, the most massive jets in the industry with their ability to deliver the maximum power to the pipe wall, all combined in a controlled rotation assembly which maximizes dwell time that such massive power is delivered to the pipe wall.   Truly an ingenious design and yes, I am a fan! is a certified dealer of StoneAge sewer nozzles, and is the longest selling dealer of the Warthog nozzle in Southern California.  We offer the full line of Warthog nozzles and their parts.  You may access them here at at very competitive pricing and for a limited time, free shipping.

John "JP" Pujol Posted by John "JP" Pujol

John "JP" Pujol is the President of Advanced Infrastructure Technologies, LLC in Torrance, California. JP sells sewer nozzles, push cameras, locators, jetter tools and rodding tools for municipal utility maintenance of above and below ground sewer water infrastructure.

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