Designing for the Worst Hour, Not the Average Day: Pump Station Capacity Planning

On paper, it could seem straightforward: water is pumped into a different location. In practice the distance between those two points could be a matter of fluctuating rate of flow, elevation differences and solids, pressure requirements storage capacity, controls and electrical equipment, access to maintenance and restrictions at the site.

Image credit: romtecutilities.com

For Romtec Utilities, designing a pump station begins by defining those operating conditions rather than selecting equipment from a standard catalog. Then, the initial plans and budgetary specifications can be developed based on what the needs of the project.

Begin with a single question What’s the Next Step?

The answer immediately changes the technology.

The flow of household sewage is subjected to significant variations throughout the day. If gravity conveyance fails or isn’t sufficient the wastewater lift station will be required to transfer the wastewater. Engineers should therefore take into consideration the expected inflow and high-pressure conditions, pumping capacities Wet-well behavior, discharge requirements, as well as the manner in which the equipment is maintained and operated.

The water challenges faced by industrial facilities are different. Processing or manufacturing facilities could require moving high-temperature, caustic and oily, or high-pressure fluids. Romtec Utilities creates industrial systems which are utilized in applications ranging from data centers, oil and gas installations, food processing power generation, pharmaceutical waste.

Rainfall creates a completely different operating system

Stormwater systems can for long periods be inactive and unable to handle activity, but then they can face massive volume during a storm.

A stormwater liftstation associated with a detention basin has to be able to work in conjunction with the larger drainage plan of the site. When the basin fills up temporary storage is responsible for the volume immediately, and a pumping system then moves the water that is collected to an approved discharge point.

Romtec Utilities provided this solution for the creation of the Norco business park in California. The pumping equipment was needed to empty the detention reservoir and then discharge it into the stormwater network. The station was to be planned as a component of the drainage infrastructure for the development, rather than being a separate piece of equipment.

Package Does Not Mean “Off the Shelf”

It is a common misconception that a pumping device for packages is just a collection of predetermined components.

In the scenario of engineered infrastructures packaging can mean that all major components are linked into a system. Controls, pumps and meters along with the structural elements and other equipment, can be chosen in accordance with the requirements of the project.

This strategy is particularly beneficial when a new system needs to connect to existing infrastructure. In municipal and industrial buildings, there is rarely an infinite amount of space or complete clean environment for the installation. It is possible to modify equipment in order to fit into existing structures, piping electrical systems, schedules and schedules.

Capacity planning has real consequences.

The cost of undersizing rises when the facility is expanded.

Romtec Utilities, a Portland International Airport utility company, has designed and constructed an sewer interceptor lift station to the PDX Next project. The new station needed to be designed to have twice the capacity for peak flow because the airport has grown.

It demonstrates a key engineering principle: design conditions should not be limited to what a facility can handle on a normal afternoon. Engineers should be aware of the conditions that occur during peak demand.

The job isn’t finished when the equipment arrives

At some point, calculations and drawings will eventually become a functioning system. Installation coordination and documentation are crucial to the long-term success of.

A properly engineered pumping system will ultimately be defined by the events that occur after construction. The decisions made during initial design are evident whenever equipment needs maintenance flow increases or a storm hits.

For Romtec Utilities to integrate those options into a project-specific pumping solution helps turn individual pieces of equipment into infrastructure designed for the conditions it’s likely to encounter.

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