What info do I need to size a pump?

Flow (GPM) + total dynamic head (TDH), fluid details (chemistry, temp, solids/viscosity), suction conditions (NPSHa), desired materials, seal type, driver/voltage, connection sizes, and duty cycle.

What is TDH (Total Dynamic Head)?

The total head the pump must overcome: static lift + discharge head + pressure requirements + friction losses in pipe/fittings/valves/filters, adjusted for fluid density.

How do I choose a pump type (centrifugal vs positive displacement)?

Centrifugal for higher flow/low–moderate viscosity and smoother operation; positive displacement for high viscosity, accurate metering, higher pressures, or when flow must stay steady as pressure changes.

What’s the difference between ANSI and self-priming “trash” pumps?

ANSI process pumps are for clean/process fluids and standard chemical-duty applications; self-priming trash pumps are built to handle air entrainment and larger solids for dewatering/wastewater.

How do I select pump materials?

Match wetted materials to the fluid chemistry, temperature, and abrasiveness (e.g., 316 SS for corrosion resistance; ductile iron for general service; hardened materials/coatings for abrasion).

Can I run a centrifugal pump with a partially closed valve?

Often yes on the discharge side to control flow (within limits), but avoid deadheading too long (heat buildup); never throttle suction, use a valve only for isolation.

What’s the best way to control pump flow?

VFD speed control is usually most efficient; throttling works but wastes energy; bypass recirculation may be needed to maintain minimum flow.

How do I select a pump for viscous fluids?

Use viscosity-corrected curves or consider positive displacement; expect reduced flow/increased power and ensure suction piping supports high-viscosity feeding.

How do I select a pump for solids or slurry?

Define solids size, concentration, hardness, and shape; choose solids-handling hydraulics, slower speeds, abrasion-resistant materials, and appropriate clearances.

How do I prevent corrosion/erosion in pumps?

Select compatible metallurgy/coatings, control pH/chemistry, reduce velocity in corrosive service, manage solids, and use wear parts designed for abrasion.

What maintenance is most important for pump reliability?

Alignment, lubrication, seal support/flush checks, strainer cleaning, vibration/temperature monitoring, and verifying operation near BEP and above minimum flow.

Best Efficiency Point is where the pump runs most efficiently with lowest vibration; aim to operate near BEP to improve seal/bearing life and reduce energy cost.

Pumps - Mosherflo Pumps

Industrial pumps move liquids from one place to another, whether you’re handling water, chemicals, or thick, heavy fluids. Most pumps fall into one of two main categories: positive-displacement pumps and cen...

Categories from Mosherflo Pumps (2)

Centrifugal Metallic/Non-Metallic Sealed Pumps

Centrifugal pumps are the most common types used in industrial and commercial applications. They can move large volumes of fluids, making them ideal for water treatment plants, oil refineries, and other high-demand environments. Centrifugal pumps come in various styles, including self-priming and submersible models. Centro offers a complete selection of centrifugal pumps available online, making it easy to find the right pump for your needs. Whether you're looking for a centrifugal water pump or a self-priming model, Centro has the perfect pump for your application.

Trash Pumps

Trash pumps are robust and specialized devices designed for efficiently handling and transferring water containing solid debris, such as leaves, mud, and other waste materials. These pumps are aptly named for their ability to tackle challenging tasks involving dirty or trash-laden water, making them indispensable in various industries and applications. Commonly used in construction sites, mining operations, and flood control scenarios, trash pumps excel at moving large volumes of water swiftly and effectively, even when it's laden with solid particles. With their durable construction and powerful performance, trash pumps play a vital role in maintaining clean and efficient water management systems, contributing to the seamless operation of projects that require the removal of debris-laden water.

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