How Site Elevation Becomes Part of Pump Station Design

The design would be simpler if water was flowing at exactly the same speed.

It’s not.

The amount of wastewater entering the residential system fluctuates throughout the day. Industrial and commercial facilities could have operating peak times. The conditions for stormwater can drastically change with the weather. The demand for clean water is also different according to the application.

Image credit: romtecutilities.com

To design a pump station, it is not just a case of selecting the equipment that can be able to handle a particular flow. Engineers must be aware of the potential conditions under which the system can be utilized.

Think in Operating Conditions Think in Operating Conditions, Not just Maximum Capacity

The highest flow is crucial however, it is just part of the station’s operation. Imagine that a system for wastewater treatment was created to handle a high flow at peak. For the most part the flow coming in is less. During these normal operating times, the station should still function normally.

This brings up questions about wet-well sizing, pump operation, control, head conditions and how the equipment will respond when demand changes.

A well-designed package pumping system brings these factors in line with the requirements of the site instead of using the highest capacity of the pump as the entire design objective.

The daily rhythm of wastewater

The influent conditions at a wastewater liftstation which serves homes, businesses or municipal infrastructure will change as a result of its operation.

The station’s control strategy will determine how the system manages the collection of wastewater and its pumps. The structural dimensions, pumping equipment and piping, as well as electrical components and controls all play a the role in this procedure.

Design may also take into account additional considerations specific to the site. Romtec Utilities is able to integrate additional equipment like grinder vaults, or odor control equipment, depending on the needs of the. The result is a system built around the needs of the project, rather than a generic configuration applied to every wastewater site.

Stormwater can change much faster

A stormwater lift station may see relatively little activity during dry conditions and then face substantially greater inflow during a weather event. The station could be part of a larger flood-control, detention, treatment, or drainage strategy, making the stormwater plan surrounding it an important part of system design.

Romtec Utilities takes into consideration elements like the flow rate needed along with head-related conditions, the size of the system, requirements of site, and environmental considerations in the design of these systems.

Stations that serve commercial developments could be very different from those intended for municipal stormwater systems.

Head Conditions Matter Along With Flow

Engineers need to be aware of what direction the water is headed and the kind of resistance they have to overcome. Engineers must be aware of the direction of the water and how much resistance it will face.

The head condition of the pump is influenced by many factors which include elevation variations and piping configurations, discharge conditions, and other system aspects.

This relationship between flow and head is a reason why selecting an appropriate pump based upon a capacity rating isn’t enough. The design and technology of the station have to suit the hydraulic requirements of the whole application.

Plan the station in the conditions it will actually experience

Romtec Utilities designs and develops custom pumping systems designed to meet the requirements of wastewater, stormwater management as well as industrial applications, boosters, and much more. Its procedure may involve budgeting and preliminary design, complete plans, system supply, documentation and startup, testing, and commissioning.

The underlying engineering principle is simple: true pumping systems don’t live their lives under a comfortable set of rules.

They have to contend with changing flows, changing needs, and specific project-specific hydraulic requirements. The station that is successful must be designed to accommodate that reality.