The Roth Solution for Low NPSH Industrial Pumps

Roth simplifies your planning and design engineering with Low 1Ft NPSH required pumps. And even if low NPSH is not essential, Roth pumps, with low NPSHr, make engineering and design easier. They provide lower installed cost since certain models only require about 1 ft. (0.30m) static suction head to simplify piping requirements and lower suction tank elevation. Cavitation is eliminated since there is no large low-pressure area in Roth pumps. Roth pumps deliver high output pressures while operating at low operating speeds and with smaller HP motors. All this means better performance, lower operating costs and much simpler maintenance when you use a Roth pump.

What is NPSH (net positive suction head)?

Net Positive Suction Head (NPSH) is a term used in fluid mechanics to describe the pressure available at the inlet of a pump. Specifically, NPSH is the difference between the absolute pressure at the pump inlet and the vapor pressure of the fluid being pumped. In simpler terms, NPSH is a measure of how much pressure is available to push the fluid into the pump, relative to how likely it is that the fluid will vaporize (boil) due to the low pressure at the pump inlet. If the available pressure is too low relative to the fluid's vapor pressure, the fluid may boil and cavitation can occur, which can damage the pump and reduce its efficiency. Net Positive Suction Head Required (NPSHr) is the amount of NPSH required by a pump for proper operation. The NPSHr is determined by the pump design and varies based on factors such as the pump's flow rate, impeller speed, and the properties of the fluid being pumped. In general, the higher the flow rate and impeller speed, the higher the NPSHr. In summary, NPSH is an important parameter for determining the proper operation and efficiency of a pump, and understanding NPSH requirements is important in selecting the right pump for a given application.

What is low NPSH?

Low NPSH, or Net Positive Suction Head, means that the pressure available at the inlet of a pump is insufficient to prevent the fluid from boiling or cavitation from occurring. When the available NPSH is too low, the pressure drop across the pump's impeller may cause the fluid to boil or vaporize, creating air bubbles or cavities in the fluid, which can reduce the pump's efficiency and cause damage to the pump. The causes of low NPSH can be due to a variety of factors, including a high fluid velocity, a high temperature, a high elevation difference between the fluid source and the pump inlet, or a decrease in atmospheric pressure. These factors can cause a reduction in the pressure at the pump inlet, which in turn reduces the NPSH available. To avoid low NPSH, it is important to select the right pump for the specific application and operating conditions. It is important to ensure that the available NPSH exceeds the NPSH required by the pump to prevent cavitation and ensure efficient pump operation.