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Tag Archive: Watson Marlow

Do You Know the Viscosity of Your Process Fluid?

Posted on by R Andrew Springer

Oil Drop

Watson-Marlow Now Offers Product Viscosity Testing

Sticky Viscous Fluid

Watson-Marlow pumps are designed to pump viscous products with ease but not every customer knows the actual viscosity of their product. Most products are shear-thinning, but some are shear-thickening, both can lead to the misapplication of a pump.

Watson-Marlow now offers viscosity testing on customer-supplied samples to more accurately recommend our pump solutions.

These Test results along with Application data (flow and pressure) and System data (pipe sizes, elevations, lengths) will ensure that we have properly sized a Watson-Marlow pump for the application.

Once agreed with our application engineers there are only a few simple steps needed to have a customers’ product tested.

  1. Request a submission form, fill it out and send it back to us.
  2. Upon review, you will be contacted by Engineering with instructions on how to submit your product for testing.

This testing usually takes within 1 to 2 weeks, which will add time to the normal quotation process, but if an expedited test is needed please notify us when requesting your application.

Tag Archive: Watson Marlow

MR Series from Masosine Discontinued and Replaced by Certa Series

Posted on by R Andrew Springer

SPS Sine Pump Click to See a Labeled Exploded View.Starting January 1, 2018 the MR Series will be discontinued. This is due to the success of the Certa series and its better performance in almost every category. The MR 120, MR 125, MR 130 MR 135 and MR 150 are all included in this discontinuation. The MR 160 will still be produced, but under the model number SPS 600L for applications that require high pressure.
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Tag Archive: Watson Marlow

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: Watson Marlow

Hose Pumps Improve Quality at Brewery

Posted on by R Andrew Springer

Beer in MugsReplacing piston pumps with hose pumps eliminates potential ingress of dissolved oxygen

The challenge
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Tag Archive: Watson Marlow

Certa – for Low Shear, Superior Viscous Product Handling with Virtually no Pulsation

Posted on by R Andrew Springer

Certa is the latest innovation from MasoSine Process Pumps, the creators of Sine® pump technology.

Certa Pump with Cover RemovedIts launch sets even higher pumping standards in food, beverage and cosmetics processing. Offering EHEDG (Type EL Class I) and 3A certification as standard, Certa is extremely easy to clean for minimal maintenance and downtime.

This advanced new innovation in food pump technology not only delivers the high suction capability to handle viscous products, it offers significant advantages over alternative technologies. Unlike traditional pumps with rotors that cut through the fluid, Certa™’s sinusoidal rotor gently carries fluid through the pump to dramatically reduce shear, while cutting power consumption by up to 50% with high viscosity fluids.

The typical advantages and high-performance levels delivered by proven MasoSine sinusoidal technology include virtually no pulsation, superior viscous handling, simplicity, reliability, energy efficiency, interchangeable parts and low cost of ownership.

For many years, Sine® pumps have played an important and highly successful part in conveying fluids with viscosities of up to 8 million cP. The new Certa pump now completes the existing product range by offering users a fully CIP capable pump at flow rates up to 183.2 USGPH.

Learn More About Certa Pumps in Springer Pumps Online Catalog HERE…

Tag Archive: Watson Marlow

CERTA™ MasoSine’s Newest Innovation in Sine Pump Technology

Posted on by R Andrew Springer

Certa is latest innovation from MasoSine Process Pumps, the creators of Sine® pump technology.

Its launch sets even higher pumping standards in food, beverage and cosmetics processing. Offering EHEDG (Type EL Class I) and 3A certification as standard, Certa is extremely easy to clean for minimal maintenance and downtime.

This advanced new innovation in food pump technology not only delivers high suction capability to handle viscous products, it offers significant advantages over alternative technologies. Unlike traditional pumps with rotors that cut through the fluid, Certa’s sinusoidal rotor gently carries fluid through the pump to dramatically reduce shear, while cutting power consumption by up to 50% with high viscosity fluids.

The typical advantages and high performance levels delivered by proven MasoSine sinusoidal technology include virtually no pulsation, superior viscous handling, simplicity, reliability, energy efficiency, interchangeable parts and low cost of ownership.

For many years, Sine® pumps have played an important and highly successful part in conveying fluids with viscosities of up to 8 million cP. The new Certa pump now completes the existing product range by offering users a fully CIP capable pump at flow rates up to 183.2 USGPH.

Published by Watson-Marlow Fluid Technologies

Learn More About MasoSine Certa Pumps HERE

Tag Archive: Watson Marlow

Bredel Hose Pumps are the Perfect Solution for Thickener Underflow

Posted on by R Andrew Springer

Thickener Underflow Holding TankThickener Underflow offers unique challenges to mine and mineral extraction companies. The thickness and solids content can be detrimental to many pumps and require frequent maintenance including replacing seals and rotors.

Bredel and APEX Hose Pumps unique design greatly reduces maintenance and downtime in thickener underflow applications.
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Tag Archive: Watson Marlow

Watson-Marlow Waste Water Pumps

Posted on by R Andrew Springer

All treatment plants must meet increasingly stringent levels of discharge consent, while reducing operating costs. Critical processes such as centrifuge feed must be carried out reliably. Watson-Marlow Bredel hose pumps are able to meet these demanding performance requirements.

WM Wastewater Pump

Watson-Marlow Waste Water Pumps Features:

  • Grit/Abrasion Does Not Affect Hose Life
  • 100% Efficient – No Slip
  • Lowest Life Cycle Cost (LCC)
  • Only One Wearing Part – The Hose
  • Reversible
  • Dry-Running
  • Self Priming to 30′ Suction
  • 0-350 GPM to 232 PSI

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Tag Archive: Watson Marlow

Watson-Marlow Chemical Metering Systems

Posted on by R Andrew Springer

Watson Marlow Qdos Pump Used for Chemical MeteringWatson-Marlow, the world leader in peristaltic pumps, introduces its new range of engineered chemical metering systems. Building on over 50 years of pump experience, these turn-key systems are designed to save time and money by providing a complete chemical metering solution. By combining the pumps, gauges, columns and other system accessories into a complete system, Watson-Marlow provides a robust metering solution from a single source, backed by expertise from the market leader in peristaltic chemical metering.

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Tag Archive: Watson Marlow

Watson-Marlow Bredel APEX 28 and 35 Hose Pumps

Posted on by R Andrew Springer

Watson-Marlow APEX28Introducing Watson-Marlow’s new Bredel APEX 28 and APEX 25 hose pumps.

These pumps are ideal for aggressive and abrasive applications up to 116 PSI (8 BAR) while reducing operating and maintenance costs. Consider these pumps as ideal solutions to address applications from water, waste water, industrial and chemical to construction, paper and pulp.

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