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Tag Archive: Sinusoidal Pumps

MasoSine SPS Pumps Used to Automate Granola Production at S Moores

Posted on by R Andrew Springer

MasoSine SPS Continuous Mixer S MooresS Moores, a popular, “traditional” biscuits maker in England, changed from batch mixing granola to continuous mixing operations. An SPS200 pump, which was previously used for the batch mixing was redeployed for the continuous mixing operation along with two additional, new units. Using a revolution counter and speed controller (VFD), they are able to precisely measure the ingredients going into the granola mixer. This has allowed them to eliminate the need for a weighing assembly, and the majority of the manual labor associated with this process. This is possible because of the consistent volume per revolution SPS and Certa Sine pumps provide.

Cleaning the pumps is also a cinch- “Originally we looked at progressive cavity pumps, but they have wear parts and are a bit of a nuisance to clean,” says Mr. Winship. “In contrast, with the MasoSine SPS200 pumps, we simply take the front cover plate off and pressure wash, which we do once a week as part of our quality and hygiene control procedures. Other than that, the pumps are utilized heavily every day across a two-shift operation. Our original blend pump has been in place for five years and I think we’ve replaced the plastic gate once – and only as a preventative measure.”

“MasoSine pumps provide granola ingredient measurement at S Moores” Watson-Marlow Fluid Technology Group. Watson-Marlow Fluid Technology Group, February 2017. Web. 1 March 2017.

Tag Archive: Sinusoidal Pumps

Certa 100 and 200 Pumps Now Available from MasoSine

Posted on by R Andrew Springer

Certa Pumps now Available in 1″ and 2″ Sizes

Certa Flow Path AnimationCerta offers many advantages over lobe and circumferential piston pumps, especially when pumping high viscosity fluids. You can use a smaller Certa in place of a larger competitive pump type due to Certa’s low NIPR. They also require less horsepower for the same process conditions, which increases the pump’s efficiency and reduces it’s energy consumption.

Tag Archive: Sinusoidal Pumps

What is NPSH (Net Positive Suction Head) and Why Does it Matter?

Posted on by R Andrew Springer

The Net Positive Suction Head (NPSH) margin is a crucial factor that is commonly overlooked while selecting a pump. It is the difference between the NPSH available (NPSHa) at the pump’s inlet and the NPSH required (NPSHr) by the pump to operate without cavitation. Cavitation is the formation of bubbles at the pump inlet, followed by their sudden collapse, which can cause permanent damage. The NPSH margin value must be positive to avoid cavitation.

Pump designers use NPSH to ensure that pumps will operate without internal damage caused by cavitation under all specified operating conditions.


NPSH can be defined in two parts:NPSH Definition

NPSH Available (NPSHA): The absolute pressure at the suction port of the pump.

NPSH Required (NPSHR): The minimum pressure required at the suction port of the pump to keep the pump from cavitating.

NPSH or Net Positive Suction Head is a very important part of a pumping system. The systems NPSHA must be higher than the pump’s NPSHR in order for proper pump performance and to eliminate the risk of cavitation, which can damage a pump in short order and shut down operations that depend on that pump.


How does NPSH relate to Pump Operation?

Pumps work by creating a pressure differential between the inlet and the outlet—the high pressure at the inlet causes fluid to flow towards the low pressure at the outlet. As the fluid flows through the pump, it experiences steadily decreasing pressure along the flow path. If the pressure at the inlet falls below the vapor pressure of the fluid, bubbles will form at the inlet.

These bubbles collapse rapidly inside the pump as they move towards the outlet. This cavitation causes the pump to operate noisily, making it sound like something like gravel in a concrete mixer. The bubbles in the fluid also reduce the capacity of the pump. Most importantly, cavitation removes small spots of material from the inside walls of the pump, pitting the walls and causing permanent damage to the pump.


How to Use Net Positive Suction Head to Select a Pump

NPHSr, the NPSH required for the proper operation of the pump, depends on the pump design, the rotational speed of its impellers, and its age. Pitting also depends on the hardness of the material that the pump is made from, which makes that a factor as well.

NPHSa—the NPSH available at the inlet—depends entirely on the operating environment, including the temperature of the fluid being pumped. As explained above, it is crucial to maintain a positive margin between NPHSa and NPHSr.

As a general rule, make sure that NPHSr is less than NPHSa by the larger of 5 feet or 10% of NPHSa. For example, if NPHSr is 10 feet, NPHSa must be at least 15 feet.

NPHSa calculations should consider the temperature of the fluid and the distance between the pump and the suction source. Cavitation occurs more readily at higher temperatures since vapor pressure increases with temperature. If the suction source is below the pump, the vertical distance between the two reduces the NPHSa at the pump’s inlet.

It is necessary to measure pressure accurately with pressure gauges to ensure selection of the right pump for the job.

Gauge Pressure Equation

Pressure gauges measure pressure relative to atmospheric pressure. The readout of a pressure gauge is called gauge pressure. Atmospheric pressure, nominally 14.7 psi at sea level, is added to gauge pressure to get absolute pressure. Therefore:

  • Absolute Pressure = Gauge Pressure + Atmospheric Pressure

Vapor pressure of a fluid is expressed as absolute pressure. So absolute pressure is used for calculating NPSHa using the formula:

NPSHa = Ha – Hvp.

  • Ha = absolute pressure of the fluid at the inlet of the pump
  • Hvp = absolute vapor pressure of the fluid at the operating temperature

Using this formula ensures selection of a pump whose NPSHr is less than the greater of 10% of NPHSa and 5 feet.

**This is only a brief summary of THIS paper put together by MasoSine Process Pumps

**Learn More About MasoSine Pumps and Their Low NPSHR HERE…


Pump Selection Assistance from Springer Pumps

Springer Pumps features fluid handling solutions for a broad range of industries. Our pumps are used in a variety of applications ranging from unloading rail cars to pumping liquids, pastes, and gels. For more information about pump selection or calculating NPSH values for your application, check out our NPSH guide or contact us.

NPSH Net Positive Suction Head Diagram
Curve Shows Pressure Along the Flow Path of a Typical Centrifugal Pump

Tag Archive: Sinusoidal Pumps

Trade in Your Lobe Pump… Trade Up to Certa

Posted on by R Andrew Springer

MasoSine Certa Trade In Trade UpCerta pumps from MasoSine have many advantages over lobe pumps, not the least of which is lower cost. Contact us today to find out how to trade in your existing lobe pumps for credit to apply towards a new Certa pump.

What Separates the Certa Sinusoidal Pump from Lobe Pumps?