What You Didn’t Know About Double Disc Pumps

Double Disc Pump installation

Double Disc Pump installation

Wastecorp recently exhibited at a national water quality conference where we had a chance to discuss our exciting double disc pump technology with engineers, end users and pump distributors. We addressed some of the most common issues/questions below:

Can a Double Disc Pump Have Ball Valves?

Yes. In fact, ball valve technology is helping to usher in the next era of double disc style pumps. The ball valves help to break up solids and make pumping thicker municipal sewage easier. The ball valves also make it much easier to maintain the pump. With the traditional clack valve style double disc pump, debris can get stuck in the clack and trunnions which may reduce pumping productivity. With a Sludge Pro® Double Disc Pump you simply open up the valve chambers, check for any debris and blockages and get back to business.  Just because one type of double disc pump has a clack valve doesn’t mean others have to.

Is The Term Double Disc Pump a Registered Trademark?

No. In fact, it is unlawful for any one manufacturer to place a registered trademark “®” designation next to the generic term “double disc pump”. It hurts competition and misleads consumers.

Do You Have to Crawl Under a Sludge Pro® Double Disc Pump to Conduct Maintenance Like You Do Other Makes?

Absolutely not. Wastecorp would never design a pump where an operator or maintenance person had to crawl underneath a pump with hundreds of lbs potentially hanging overhead. This poses a safety risk and may lead to serious injury or death.

Is there really a difference between the clack valve style double disc pump and Wastecorp’s Sludge Pro Double Disc Pumps?

Yes. First, the Sludge Pro® includes a hydraulic jacking system that raises the shaft so the trunnion and wet section can be worked on while the maintenance person is standing up. Who would want to crawl underneath a pump to conduct maintenance?  Second, municipal sewage involves a lot of grit and solids to be pumped. Wastecorp designed a disc pump better able to manage solids and thicker sewage.  Third, you won’t find swan necks or clack valves on a Sludge Pro® A pump that involves removing the swan neck to access the pump internals may cause reduced productivity at a WWTP.  Belt and pulleys are another time waster that you won’t find on a Sludge Pro® double disc pump. Energy efficient direct drive systems reduce the motor hp required so the sewage pumping operation can operate more efficiently.

What is the difference between a single housing design and a three housing design?

A three housing design doesn’t really mean anything. It is the preference of the pump manufacturer. However a three piece pump body design may lead to increased parts to replace and repair and possibly more down time for the facility. A single housing design may improve access to the pumps internals and reduce the amount of pump maintenance people needed to work on the pump.

What drive systems are available for double disc pumps?

Electric driven and engine driven (usually) diesel are preferred by most facilities.

Where can I find Engineering Specifications on Double Disc Pumps?

You can find them on wastecorp.com or click on this link and we will take you to the double disc pump selection page. You can also call Sludge Pro Double Disc Pumps at 1-888-829-2783 or email info@wastecorp.com

 

 

 

 

Diaphragm Pump for Sewage Pumping

Primary sludge pumping from digesters

Primary sludge pumping from digesters

If your pump project calls for primary sludge pumps under 220 GPM, the Mud Sucker Double Diaphragm pump is something you should consider for municipal sewage and industrial sludge pumping applications.

Case in point: A Northeast urban wastewater treatment plant upgrade and expansion recently Continue reading

Compare Double Disc Pumps With Single Disc Pumps

Double Disc Pump or Single Disc Pump? You Decide.

Double Disc Pump or Single Disc Pump? You Decide.

Since we launched the Sludge Pro Disc Pump product line, there have been several questions as to whether or not a single disc or double disc pump is more appropriate for specific wastewater treatment applications.

To be clear, there is not always a need for a double disc pump. A single disc pump will fit the pump specification properly. One of the reasons why consulting engineers and contractors have put the double disc pump specification in place is because up until recently there have been few other alternatives. In many cases, a double disc pump is simply overkill in both pump, footprint, cost and maintenance time down the road.

Single Disc Pump Where a Double Disc Pump is Overkill

Single Disc Pump Where a Double Disc Pump is Overkill

Take the Sludge Pro single disc pump for example. This pump series offers up to 150 GPM pumping capabilities with a single disc, trunnion and pump body.  This reduces the footprint in most municipal WWTP’s by at least 20%. You also reduce repair costs by replacing only one disc, trunnion and connecting rod instead of two. With over 21 years of pump manufacturing experience, Wastecorp designed the Sludge Pro with a heavy duty ball valve configuration because this design has demonstrated improved solids and slurry pumping capabilities over traditional double disc pump manufacturers. The Sludge Pro single disc pump is available in 3”, 4” and 6” connection sizes with discharge head up to 184’ or 80 psi. You can learn more about Sludge Pro single disc pumps at http://www.wastecorp.com/disc-pumps.html or speak to a disc pump engineer at 1-888-829-2783 anywhere in the United States and Canada. You can email info@wastecorp.com to find out where the closest double disc pump or single disc pump engineer is closest to you. There are also educational resources about double disc pumps and single disc pumps at your disposal. See video comparing disc pumps and decide for yourself. You can also see video of both double disc pumps and single disc pumps by clicking here.

 

How a Double Disc Pump Works

Inside the double disc pump

Inside the double disc pump

We have all seen the outside of a double disc pump but rarely do we see what makes the pump actually work. Just to review, a double disc pump is a positive displacement pump that uses a trunnion (elastomer), a disc and a connecting rod to force sewage from the suction side to the discharge side of the pump by creating a vacuum inside the pump body. The suction and discharge valve chambers (with the black check valves) you see in the photo help to manage higher than normal concentrations of grit and solids in municipal wastewater.

 

How a double disc pump works.

How a double disc pump works.

 

In the patent pending Sludge Pro double disc pump design, wastewater flows into the suction side where the check balls help to break up and manage solids, plastics and rags. The fluid then meets the first disc and trunnion, which creates a vacuum- like suction inside the pump body and forces wastewater to the discharge side. With a dual ball valve configuration on the suction and the discharge side, it’s like providing an extra layer of protection when pumping higher concentrations of grit and solids.

Run The Double Disc Pump Dry With No Damage

The Sludge Pro can run dry indefinitely without damage to any component of the pump. If you operate other types of sewage pumps without fluid in the pump casing or pump body, catastrophic damage to the pump happens in a matter of seconds or minutes. You can only imagine what the repair bill would be in such a circumstance. See the features section of Wastecorp’s Sludge Pro Double Disc Pumps for more information on how the pump works.