Sea Level Basics for Reciprocating Pumps

Posted by Sam Kelton | October 17, 2018

Pump cavitation is a phenomenon that can wreak havoc on even the most durable and robust pumping systems. Blame is often unfairly cast on the construction of the pump itself. However, most times, cavitation is the result of poor system design, lack of maintenance, and improper understanding of the environmental factors that contribute to pump performance, such as sea level and vapor pressure.

The key to preventing pump damage lies in a sound understanding of a parameter called the net positive suction head (NPSH). To avoid cavitation, the pressure at all points of the fluid must remain above the vapor pressure; in other words, the available net positive suction head (NPSHa) must be sufficiently larger than net positive suction required (NPSHr) at the pump inlet.

The NPSHa is determined by the following formula:

NPSHa = Pa +/- Pg +/- Pz – Pvp – Pf – Pac

Where:

Pa = Atmospheric pressure

Pg = Gauge pressure at the supply tank

Pz = Gead or lift pressure

Pvp = Vapor pressure of the liquid at its actual temperature

Pf = Pressure required to overcome friction

Pac = Acceleration pressure

Here, we will look at the various factors that affect the NPSHa value and how they influence cavitation.

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Insights into Our Newly Trademarked Products

Posted by Sam Kelton | October 1, 2018

Triangle Pump Components, Inc. (TPCI) recently trademarked three product names for our reciprocating pump valves and components. These valves and extension rods, all of which meet ASTM and ISO 9001-2015 standards, feature names derived from various origins with significant meanings related to their features and applications.

Below is a closer look at the meanings behind three of our newly trademarked products.

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Understanding Atmospheric Pressure

Posted by Sam Kelton | June 19, 2018

By better understanding the basics of atmospheric pressure, you can take the necessary steps to prevent pump cavitation.

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National Safety Month: Prevent Heat Exhaustion This Summer

Posted by Sam Kelton | June 18, 2018

June is National Safety Month—a time when the industrial sector focuses on key issues that can impact employee safety. As the summer months roll in, northern states get hot and southern states get even hotter, so ensuring employees stay safe and cool becomes a concern in facilities nationwide.

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7 Questions to Check Off When Inspecting for Pump Cavitation

Posted by Sam Kelton | June 6, 2018

Cavitation — the formation of bubbles in a liquid — is the No. 1 problem encountered when operating plunger pumps. Cavitation can cause a remarkable amount of damage to pump components and the pump as a whole, resulting in costly repairs, increased labor needs, and extensive downtime.

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Reciprocal Pumps in the Oil and Gas Industry

Posted by Sam Kelton | May 8, 2018

Reciprocating pumps are used to transport both clean and abrasive fluids. These pumps are more efficient and robust than their centrifugal or rotary counterparts, making reciprocating pumps the ideal choice for the oil and gas industry.

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How to Avoid Pump Packing Failure

Posted by Sam Kelton | April 18, 2018

Offering great versatility, mechanical seals are commonly employed to seal pumping equipment. However, there are still a number of pumps and devices that make use of compression packing for sealing purposes. Such pumps are used across a wide range of industries, including pulp and paper manufacturing, power generation, and water treatment, and play a critical role in supporting various industrial processes.

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A Closer Look at Net Positive Suction Head

Posted by Sam Kelton | February 20, 2018

To put it simply, pumps work based on the principle of pressure difference: Fluids flow from regions of higher pressure to regions of lower pressure, and pumps facilitate fluid transfer by creating a pressure difference, or pressure head.

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Pump Starvation Information

Posted by Sam Kelton | January 8, 2018

The result of restricted inlet liquid flow, pump starvation can be devastating to pump systems. Starvation causes pumps to run dry, quickly decimating the pump plungers, packing and valves.  

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Triangle Pump Components - Volumetric Efficiency

Posted by Sam Kelton | November 15, 2017

Are your pumps running at their maximum strength? To be sure your pumps are operating at optimal volume, it is important to evaluate their volumetric efficiency on a regular basis.

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