What’s the Difference Between API vs. ANSI Pumps?

Centrifugal pumps are required in several industrial and commercial applications, from food and drink manufacturing to chemical synthesis and oil and gas exploration efforts. Depending on operator specifications, various pump configurations may be employed. In this article, we will consider API and ANSI pumps and highlight the key differences between the two types.

API vs. ANSI Pumps

API and ANSI pumps are designed according to two different standards, the American Petroleum Institute and the American National Standards Institute. While API pumps are usually integrated into refinery and oil and gas industry applications, ANSI pump operations are typically more versatile. For example, ANSI pumps can be successfully employed in food manufacturing, chemical processing, textile production, and several other process plant operations.

API Pumps

As mentioned earlier, API pumps are built according to the American Petroleum Institute standard 610. These pumps are made almost exclusively for oil and gas exploration with the ability to tolerate very high operating temperatures and pressures.

Advantages of API Pumps

The key advantages of API pumps include:

• Maximum efficiency in elevated temperatures and pressure.
• Safe containment of application emissions
• Ability to handle environmentally damaging process fluids

Disadvantages of API Pumps

The drawbacks associated with API pumps include:

• Higher setup and operational costs
• Less versatile and not as readily available as ANSI pumps

ANSI Pumps

ANSI pumps are designed to ANSI B7.1,2 or 3 specifications for various types of fluids. Consequently, their use is more versatile for commercial and industrial applications. When crafted with the right materials, ANSI pumps can be integrated into highly corrosive environments and perform efficiently.

These pumps are typically designed as single-stage centrifugal pumps. However, depending on the intended application, ANSI pumps can be built according to various specifications with varied flow rates, total head pressure, and horsepower.

Advantages of ANSI Pumps

The main benefits of ANSI pumps are:

• Cheaper than API pumps
• Versatile pump systems are easily configured for different applications
• High tolerance for solids transmitted alongside fluids
• Straightforward interchangeability between brands and manufacturers

Disadvantages of ANSI Pumps

Drawbacks of ANSI pumps are:

• Poor handling of thicker, more viscous fluids
• ANSI pumps can’t be used to replace other types of centrifugal pumps

Key Differences Between API and ANSI Pumps

The critical differences between API and ANSI pumps are highlighted below

Casing Design (Pressure and Temperature Ratings)

API pumps are rated for around 600 psig at a temperature of 600°C, while ANSI pump ratings are 300 psig at 300°C.

Bearing Housing

API units typically have more robust bearing house designs compared to ANSI pumps. This enables them to handle the greater temperature requirements for oil and gas applications. In addition, API units often integrate steel-bearing units with cooling jackets for optimal thermoregulation.

Impellers

API pumps impellers are usually enclosed with case wear rings, while ANSI pumps are largely open in configuration.

Mounting

API pumps are centerline mounted to counteract the effect of thermal expansion anticipated during high-stress operations. However, ANSI pumps are typically foot-mounted, making their process tricky at higher temperatures, leading to diminished operational life spans.

Which Pump Is Right for You, API or ANSI?

One of the most important considerations when deciding on a pump system should always be operational safety. Minimizing the hazards plant personnel are exposed to should be the priority.

As clearly highlighted in this article, both ANSI and API pumps have their merits and drawbacks. Therefore, operators must carefully consider their processes’ unique requirements (pump operating temperatures, pressures, environment) and balance this against personnel safety while aiming for maximal efficiency and productivity.

PumpWorks is a Leading Supplier of API and ANSI Pumps

Now that you know the differences between API vs. ANSI pumps, you should be on your way to making a selection. Still need help? Check out our online Pump Selection Tool!

At PumpWorks, we aim to deliver the ultimate service experience for all our partners. We provide state-of-the-art process pumps guaranteed to give you the edge in your manufacturing processes. In addition, our highly trained and experienced team is always available to assist with all your pump-related queries and help you choose the right pump for your unique applications.

Contact our team to learn more about our API and ANSI pump solutions.