10 Questions You Should to Know about Commercial Sewage Lift Station Pumps

3. How does that change during the lifetime of the pump station?  

We recommend completing a deep inspection of the pump station’s components every 5 years, especially if issues are frequently occurring. For example, if the pumps are continually clogging you might want to move to chopper pumps or add a trash basket to the inlet. When it comes to the electronics, infrared reading can look for hotspots and predict failures before they occur. This gives you the time to prepare a replacement on a schedule instead of emergency.  You want to track if there is a change of use since the pump station was originally designed. This could include an increase or decrease in population and daily use, consistency of the wastewater, or anything else not accounted for over the lifetime of the station.

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4. Speaking on that, how can a system account for changing flows with a change in population draining to it? 

A pump station design point is great to build from but is ultimately still a prediction of the future. If there is an unforeseen change in the pump station’s flow, check if larger, more efficient pumps are needed.  If there is the opposite issue where a decrease in flow is seen, we recommend checking the pump cycles. If a station hasn’t run on a daily basis, we recommend manually cycling it. Similar to a car motor, you don’t want to components to sit and get stale. The machine must be exercised.  Sometimes a new business or residence gets added to a collection system that creates a lot of trouble, such as a Truck Stop or Assisted Living Center with unexpected products in the waste stream.  Upgrading the pump selection can be an easy fix.

5.When running a typical inspection, what is your main focal point when performing maintenance on the controls? 

When checking the controls of a station you first want to make sure the electronics are still calibrated properly. This can easily be done by checking the level settings to make sure there is not a negative number or an outrageously large number in the PLC. You should also check to see if there have been any power outages between visits. Power outages can wreak havoc on a pump station’s electronics.

6. Power outages obviously aren’t good on any electrical component but what weak points should especially be checked after an outage? 

First and foremost, make sure you still have your alarm logs and that nothing was lost during the power reset. From there, check to see if all your components are running as intended. If not, hard resets should get the station back to factory conditions. However, we have seen pumps fail to run in Auto from the factory setting. This can be for a variety of reasons depending on when the system was interrupted. Check to make sure the floats aren’t hung up partway down or sitting on top of a layer of fats/grease. From there, confirm your pump station is cycling automatically as required.

7. What have you found are the best ways to prevent float issues within the wet well? 

The best way to prevent float issues is to install them with the needed spacing, and keep the station clean. This means hanging the floats so they’re not directly in front of the inlet.  Be cognizant that they are set where they won’t get sucked into the pump. Lastly, keep them clean. With FOGs (fats, oils, and greases) within the wet well, floats tend to try to float on top of thick buildup layers. This could cause discrepancies in the levels and cause pumps to run over their needed use.

8. What have you found to be the biggest culprit of pumps clogging and what do you suggest to fix it? 

Inorganic solids not intended for the waste stream have become more and more of an issue. Before intended use, look for construction debris like gravel, mud, paint, drywall tape, and more that can cause problems from start up.  Often the pump station goes in early in the development and unwanted construction debris and mud/gravel flow in.  After start up, during intended use, we’ve seen “flushable” wipes, up to 1/8 inch rags cause blockages on a consistent basis. With an increase in water saving appliances, there is just less liquid to push solids within the waste stream. Chopper and grinder pumps have been proven to handle these solids by cutting them into pieces 3 inches or less.  We can bring the Barnes SITHE Chopper Pump trailer to do a demonstration if you want to see it up close and personal – you’ll be impressed.

9. What is the strangest blockage or piece of debris that you’d seen? 

It was after new construction. I had a 2 inch hole saw core that made it through the piping and then perfectly fit in the bottom of the pumps and clogged it whole. It was perfectly stuck until I had to pull the pump out of the wet well completely to dislodge it.  Crazy stuff gets into waste streams, but a properly designed and well maintained pump station is your best chance of avoiding critical downtime.

10. Have you ever dealt with wildlife at a pump station? 

Of course, many times!  We could film some nature shows, not all with a happy ending unfortunately. There’s been mice, raccoons, and possums that I’ve had to evict to make sure they weren’t chewing on any wires. I’d have to say bees are probably the worst. I don’t think I’ve been to a station in the last three years that hasn’t had at least one bee. They like to make nests in all the nooks and crannies that a pump station provides. Some of this can be part of the daily or weekly monitoring before it leads to an infestation.  Bring a can of bee spray along, you’re likely to need it.

BONUS: What do you think is the best way to keep up with your pump station’s health? 

The easiest way is regular inspections. Myself and the rest of our team are available to provide check ups with our Maintenance Plus program. We provide annual, semi-annual, or quarterly plans where we’ll perform pump performance and electrical checks, valve operation check, level control checks, and more. This will be a way for us to support your efforts in ongoing maintenance that includes the daily to weekly inspections. From the electronics perspective, SCADA Systems help provide you with the information that keeps your electronic components healthy for your long-term use.

By Chris Edmondson

 Over the last several weeks we’ve talked about many aspects of designing a commercial sewage lift station, from flow rates to components.  In this blog, we’re going to work through a really simple sizing example. Let’s say we are sizing a sewage station for a retirement facility made up of primarily independent living units. 

For more Commercial Sewage Lift Station Pumpsinformation, please contact us. We will provide professional answers.

By Chris Edmondson

 In a previous blog we discussed how to determine the flow for a commercial sewage lift station so you determine the necessary pump capacity.  Today we are going to discuss Total Dynamic Head, which is also critical to sizing a pump for a sewage lift station.  Not only is it absolutely necessary to select a

By Chris Edmondson

 Section 712 of the International Plumbing Code (IPC), Section 712, places a burden on the shoulders of engineers.  You have to design the sewage pit or basin that collects the sewage and houses the pump(s).  To do that properly, you need to address the following questions:

 How big should the basin be? According to Section 712.3.2, “The sump pit shall be no less than 18

By Chris Edmondson

Sometimes codes just aren’t very helpful.  Take Section 712.4.2 of the International Plumbing Code (IPC) and its insight into the selecting flow capacity for a sewage and ejector pumps:

712.4.2 Capacity. A sewage pump or sewage ejector shall have the capacity and head for the application requirements.

(Thanks, IPC….)

Clearly, having the proper flow is necessary to efficiently discharge wastewater from a commercial plumbing system – but how do you determine the flow rate for the sewage system so you can properly size the pump? 

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