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How to Find Your Pump Model and Part Numbers

PumpProducts.com has made it easier than ever to find repair parts for your pump with our repair parts finder tool! If you&#;re not sure of your pump&#;s make or model, below is a guide to help you out.

I&#;m Not Sure What Pump Model I Have

Identifying your pump is the first step in replacing it or knowing which repair parts match your pump model. Many customers call us looking to replace their pump but they&#;re not sure which pump model they have or even who their pump&#;s manufacturer is. Luckily, your pump has all this information printed on it.

To identify the model of your pump, you need to know the part number. Part numbers, also sometimes referred to as model numbers, can be found on your pump&#;s tag. A pump tag is a small rectangular plate that displays all the basic information about your pump. Besides a pump&#;s part number, pump tags can include information like the gallons per minute, total dynamic head, and max working temperature of a pump. The information included on the tag is going to depend on the manufacturer of the pump.

Here is a video where our pump expert Nick breaks down how to identify your pump based on its pump tag

Different types of pumps have their tags in different places. Finding the pump tag is sometimes half the battle. They are usually located on the volute of the pump (or the main body of the pump- the part that&#;s not the motor). Once you find your pump&#;s tag, the next step is, understanding what the information on that tag means exactly. If you can&#;t find your pump&#;s tag or if the numbers have faded or are hard to read, consult your owner&#;s manual or other paperwork that came with your product.  Most product manuals will indicate where to find the model number.

Different manufacturers label their pumps differently. For example, some of the information printed on the Grundfos tag below might not appear on another brand&#;s pump or it can be referred to differently. This can be confusing at first so it helps to know who your pump&#;s manufacturer is and how they refer to their models. Some manufacturers print their logo on the pump.

You might see another similar looking plate on your pump. This is the pump&#;s motor tag. The motor tag gives information about the motor attached to the pump such as volts and phases. While the pump tag is usually located on the pump&#;s volute, the motor tag is located on the pump&#;s motor.

If the tag is missing, try to locate the casting number. Casting numbers are stamped directly in the steel/iron or bronze of the pump. These numbers are a good source of information about the unit.

Below are some examples of popular pumps and some information that is commonly printed on their tags.

This is a Bell & Gossett in-line circulator pump tag. The pump tags for these B&G circulators are generally easy to spot on the volute on the pump. On this Bell & Gossett In-Line Circulator pump, we can see the part number is and it is from the HV series. This number and series is the most important information about the pump. Knowing the exact part number will allow us to purchase repair parts or a replacement pump with peace of mind. This tag also tells us that the pump&#;s maximum liquid temperature is 225 degrees Fahrenheit. 

This next pump is a Zoeller sewage pump. The silver tag is located on the top of the pump. This tag gives us a little more information about the pump.

The part number (PN) for this pump is 267-. The pump&#;s model is N267-F. The tag also tells us this pump runs at 115 volts, ½ HP, 10.4 amps, 70 hertz, is single phase, and is thermally protected.

And finally, this is a tag from a J7S model of the Goulds J+ series. This tag is located on the motor of the pump. This tag tells us lots of information, including HP, amps, volts, and the RPM of the pump.

If you have any questions, can&#;t find your pump&#;s tag or if you own an older pump and the tag is unreadable, give our experts a call today. No matter the model or manufacturer, our experts can help. They&#;ve seen everything pumps have to offer and will be able to assist you in identifying and purchasing a brand new pump.

Nothing in life lasts forever. Luckily PumpProducts.com stocks a wide variety of repair parts for all the most trusted brands in the industry. If you&#;re not sure of your pump&#;s manufacturer, series, model number, or can&#;t find the parts you&#;re looking for, you can or call our experts at 1-800-429- and they&#;ll help you identify your pump and get you the parts you need. PumpProducts.com is your pump, parts, accessories and motor one-stop-shop.

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Pump Impellers: 3 Different Types and How to Choose the Right One

An impeller is the heart of a pump. As the rotating component that transfers the motor&#;s energy onto a fluid, it plays a vital role in maintaining the flow and pressure in a pump.

Impellers do a marvelous job of transferring liquids by creating centrifugal force while minimizing agitation and maximizing the pump&#;s efficiency.

Centrifugal pump impellers vary in diameter, material, and number of vanes. The size of the protective wall around them, also known as a shroud, also varies. The presence or lack of a shroud classifies impellers as either open, semi-open, or closed.

The right impeller should fit well, withstand the liquid you&#;re pumping, and be able to resist wear and tear well, all without costing a fortune.

Consider these factors when making a selection:

• Size or diameter of the impeller
• Nature of the liquid to be pumped
• Material of the impeller
• Cost and maintenance of the impeller

We&#;ll show you how to select the right pump for the job, but first, here are the three pump impeller types to choose from.

1 &#; Open Impellers

All centrifugal pump impellers have rotating blades, called vanes, but in open impellers, the vanes don&#;t have any covering, resulting in an open design.

An open design makes an impeller suitable for handling liquids with suspended solids. Sewage is a good example and passes through an open design easily.

Another advantage of an open design is that it enables easy cleaning and repair of the vanes since they&#;re not covered by a metal plate.

However, open impellers are weak due to the lack of support around their vanes. They struggle to generate pressure, rendering them less efficient than semi-open and closed impellers.

As a result, they tend to be used in small pumps that don&#;t have to handle many operations.

Open impellers operate at a higher NPSH (net positive suction head) to prevent cavitation and increase pump efficiency.

What is Cavitation?

Cavitation is the formation of cavities around the impeller where pressure is usually low. They form when the liquid&#;s pressure drops below vapor pressure and turns into bubbles.

As the bubbles move to high-pressure areas of the pump, they gain tremendous energy that causes them to implode on the impeller, forming cavities.

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The cavities cause mechanical damage that leads to noise, vibration, and deterioration of the entire pump, making it less efficient.

Oversized pumps may run at a higher pressure and flow rate than their application requires. That pressure is far from the ideal operating point, known as the best efficiency point (BEP).

It&#;s best to modify the impeller in such pumps to avoid energy waste. You can do so by trimming the vanes to reduce the impeller&#;s diameter. This process results in an overall circumferential speed reduction at the impeller&#;s outlet.

When the outside diameter is reduced, so are the flow rate and head, but this doesn&#;t alter the rotational speed. This process improves impeller capacity, which saves energy and reduces costs.

Trimming an impeller is considered when:

• Open system bypass valves create an excess flow rate
• An oversized throttle pump provides head that exceeds process requirements
• The flow rate and operating head exceed process requirements

Note: Limit trimming to 75% of an impeller&#;s diameter. Trimming 5-10% more than the recommended 75% increases the net positive suction head required (NPSHr) due to recirculation between the impeller inlet and discharge.

A bit of clearance space must be left between the impeller vanes and casing to minimize the liquid&#;s recirculation.

2 &#; Semi-Open Impellers

Semi-open impellers have a metallic back wall that strengthens their vanes more than open impellers. However, the front side remains open.

Their efficiency is between that of open and closed impellers, making them suitable for medium-sized pumps.

Semi-open impellers can handle liquids with higher levels of solids, such as mud, better than closed impellers. They&#;re able to do so because they aren&#;t restricted by their back wall, as closed impellers are.

A shroud&#;s mass determines the impeller speed, so semi-open impellers rotate faster than closed impellers but slower than open impellers.
Semi-open impellers can handle mud and fibrous material, such as paper pulp, well. However, constant pumping of these solids wears on the impellers as the solids rub against the vanes repeatedly.

As they wear out, the space between the casing and impeller vanes, known as clearance, increases. This causes slipping and recirculating of the liquid, leading to pump inefficiency.

You can correct the wearing out of semi-open impellers by making axial adjustments. A small variation in axial clearance simultaneously changes the axial size of the front and back clearances, greatly improving the pump&#;s performance.

However, a large axial clearance at the front will decrease the pump&#;s head and inefficiency, but it won&#;t affect the shaft power.

Axial clearance mostly affects volumetric efficiency. As clearance increases, the volumetric efficiency decreases, making it the main factor in how much axial clearance is needed.

3 &#; Closed Impellers

Closed impellers have a back and front covering, making them stronger than both open and semi-open impellers. They&#;re used in large pumps and provide adequate flow at low NPSH.

Their design is more complicated than open and semi-open impellers because more materials, like cast iron and bronze, are required to fabricate them. This also causes them to be costly.

Closed impeller vanes usually have a single backward curvature, but there are wider types with double-curved vanes featuring twisted suction ends. The latter are referred to as Francis or mixed flow vanes.

Closed impellers transfer clean liquids with low viscosity, like fresh or salt water. As such, they&#;re often used in water treatment plants. Any contact with solids clogs them, and cleaning becomes difficult due to their enclosed design.

Closed impellers are very efficient because the liquid flows through the impeller&#;s eye and is directed between the two shrouds in a circular movement.

These impellers generally lose efficiency as the wear ring clearance increases. Wear rings control the discharge fluid that may flow back to low pressure.

The table below summarizes the differences between open, semi-open, and closed impellers:

• Vanes are open on both sides
• Handle suspended solids well
• Operate at a higher NPSH

• Have a back wall covering
• Handle few amounts of solids
• Operate at medium NPSH

• Vanes are covered on all sides
• Handle clean liquids only
• Operate at low NPHS

Let&#;s now take a look at what factors you should consider when purchasing an impeller.

How to Choose the Right Impeller

Material

Consider whether the impeller&#;s material can resist abrasion and corrosion. Stainless steel is the most common impeller material because of its anti-corrosive, anti-heat, and anti-contamination properties.

Bronze is a good choice when pumping liquids that contain salt. In such a case, gunmetal, a type of bronze, is used for the impeller.

Cast iron is cheaper than brass or bronze, and it&#;s resistant to alkali corrosion. But, if you&#;re dealing with acids, cast iron impellers aren&#;t a good choice because they&#;ll rust.

A good choice when pumping acids is an impeller coated with polymers. The extra layer is applied on areas prone to wear, and the impeller remains protected as long as there&#;s no damage to the coating.

Type of Liquid

If you&#;re pumping wastewater, the water may contain solids, foamy matter or stringy substances. In this case, the best option is an impeller that allows the passage of solids without clogging.

When dealing with a viscous liquid, you&#;ll need an impeller optimized to perform well with viscous liquids. This is because high viscosity slows down an impeller&#;s functionality and affects pump performance.

Compatibility

Sometimes, pump manufacturers make oversized pumps to leave room for viscosity changes. This wastes energy because the pump is operating at high pressure.

When getting a new impeller, have its diameter trimmed to ensure compatibility with the pump. Pumps are designed with shaft casings that can accommodate different impeller sizes.

Cost

The cost-effectiveness of an impeller is of utmost importance. That means considering all the above suggestions, including maintenance costs, and getting a good quality impeller at a price that won&#;t drain your pocket.

Choose the Right Pump for the Application

Pump impellers are classified as one of three types: Open, semi-open, or closed. Their classification is based on whether they have a protective shroud or not.

Open impellers handle solids well and operate at a higher net positive suction head (NPSH), while closed impellers handle liquids well and operate at a lower NPSH. Semi-open impellers share common features of the two.

To choose the right impeller, first determine what kind of liquid will be pumped. Is it corrosive or highly viscous?

The material used also determines how well an impeller can withstand wear and tear when subjected to different temperatures, pressures, and liquid types.

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