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IndustryNet Blog

How To Select The Right Metering Pump

Posted by Don Layyous, Pye-Barker Engineered Solutions on Monday, May 20, 2019

100000386_layyous_pumps3Regardless of the application, metering pumps performing to specification is a critical factor for producing end products that fall within specification.

This might range from correctly dosing treatment chemicals in wastewater plants through to a constant nutrient feed in antibiotic manufacturing, to adding anti-icing additives to jet fuels.

Regardless of the process, it is critical that the metering of additives be within allowable tolerances so that the end-product passes quality control.

Ruined end product is always expensive and trying to save a few dollars makes little sense when thousands, tens of thousands or more in raw materials and processing time is at stake.

Reducing waste and improving product quality are critical ways for many plants to boost profitability and return on investment.

This is a reason that more and more process engineers and maintenance managers are looking for ways to improve the reliability of their metering pumps and eliminate these risks from their production.

The two main categories of metering pumps are piston pumps and diaphragm pumps. Piston pumps use a mechanical piston to push the metered liquid into the process flow.

Piston pumps have packing or a seal behind the wet end which must be continually monitored for wear and tear to avoid leaks when the packing fails.

Diaphragm pumps seal off the liquid being pumped from the outside atmosphere which means that diaphragm pumps are preferred when they are pumping toxic, corrosive or volatile fluids.

Similar to the packing on a piston pump the diaphragm needs to be monitored and replaced before it fails.

In some industries, the accuracy of the metering is of higher importance than it is in other applications.

For some applications the industry standard of 1% variance/time in the delivered volume is acceptable, while for other applications the greater need for accuracy mean searching niche and ‘high end’ metering pumps in order to be confident that the metered volumes are more accurate.

For some of the more heavily regulated industries such as oil and gas or petrochemical products, like other pumps, metered pumps may have to comply with additional regulations.

Then there are the usual concerns when a pump is specified. Flow rates, discharge pressures, does the stroke adjustment be manual or automatic?

How many fluids can be pumped into the process at the same point in the process?

These sort of design questions need to be asked so that the best possible specification can be obtained.

Increase The Accuracy Of Your Metered Pumps, Make Monitoring Easier And Reduce The Risk Of Leakage

Pye-Barker is proud to represent Lewa-Nikkiso pumps in the state of Georgia. Lewa is a German Manufacturer of metering pumps and systems and canned motor pumps for the toughest applications.

Lewa produces pumps to handle flows as low as 5ml/hr through to 180m3/hr. With the option to use materials to handle highly corrosive liquids, pressures exceeding 12,000psi, means the Lewa metered pumps can be specified to suit your application.

Why Choose Lewa Metering Pumps?

Lewa’s metering technology is some of the most accurate available on the market – offering a .5% variance in flow rate – compared to industry average of 1%.

As part of this both the stroke length and the frequency can be adjusted independently of pressure to deliver very precise flow rates.

Lewa’s diaphragm pumps use a unique PTFE sandwich diaphragm with status monitoring as standard, allowing maintenance teams to replace wearing diaphragms before there is a problem and act immediately when there is a problem.

All of Lewa’s range of Metering pumps are hermetically sealed so no matter how toxic, corrosive or volatile the liquids you are pumping they can’t leak into the environment.

Thanks to their experience with oil and gas, petrochemical and pharmaceutical industries Lewa are used to designing pumps and pump systems that are complaint with API675 or other industries where there is heavy regulation

The combination of high quality materials, smart design and monitoring mean low failure rates. Which when coupled with low parts costs makes for low lifecycle costs.

The long service intervals on Lewa’s metered pumps guarantee high cost effectiveness over the life of the pump.

Modular pump design gives a great deal of flexibility to specify pumps that perfectly fit your situation.

For example, each metered pump head is modular – which means that up to 5 heads of different sizes can all be driven from a single motor – which can save your plant a lot of money on both the equipment purchase as well as on operating costs over the life of the pump – drawing less power than five pump motors would.

What Is The Process To Get The Right Metering Pumps Specified?

Metering pumps are not an off the shelf purchase and are not readily interchangeable. In order to get the correct flow rate the fluid details are essential (pressure, flow rate and what the liquid is) we also need tolerances for accuracy of the metering, whether the pump stroke needs to be automatically adjusted or can be manually adjusted.

Then your engineered solutions provider i.e. Pye-Barker is able to provide you with the best possible recommendation for pump design, materials used and monitoring required.

Depending on if your maintenance team or your contractor wants to build the pump system themselves, Pye-Barker can provide all the components or we can custom build your solution on a skid.

If we do that we’ll create the design for you to review and once agreed on we will build the skid.

Once complete the skid is then tested to be sure that all the components are integrated correctly. We then transport the skid to you, install it and commission it for you so that everything is working as specified.

What Applications Are Lewa-Nikkiso Pumps Suitable For?

Some of the applications that the Lewa-Nikkiso pumps are suitable for include:

Pharmaceutical and Cosmetics Industry

 pH controls of broths
 Nutrients feed in antibiotic manufacturing
 Sampling of products analysis
 Ratio addition of oils and perfumes for skin and body
 Metering acetone for fats, oils, resins, and waxes
 Manufacture or perfumes (Acrolein in alcohol)
 Carbowax for hair preparations and ointments
 Diatomaceous earth slurries for filtration
Chemical, Refinery, Oil & Gas Industry
 Bacteria control of water for well flooding
 Corrosion Inhibitors
 Chemical desalting of crude oil
 Caustic soda to crude oils or soured gasoline for rerun through cracking stills
 Sampling feed stocks, jet fuels, gasoline, intermediates for analysis
 Sludge inhibitors for fuels oils
 Metal deactivators (antioxidants) to eliminate gum formations in gasoline
 Caustic soda addition to pH control of sour gas or crude oil to hamper corrosion
 Acid for polymerization
 Addition of color to gasoline
 Jet fuel anti-icing additives
 Ratio addition of antifoam additives to lubricants
 Addition of antiknock components to alcohol or gasoline
 Pilot plant applications for high and low pressures
 Addition or odorants (Mercaptan) to gas lines and storage tanks
 Lubricant addition to gas lines
Wastewater treatment
 Adding treatment chemicals

What Are The Key Features Of Lewa-Nikkiso Metered Pumps?

All Lewa-Nikkiso metering pumps are hermetically sealed by the diaphragm’s static seal making it incredibly reliable. The metal diaphragm is impervious to leaks caused by diffusion and there will be no emissions into the external environment.Layyous_pumps

All Lewa-Nikkiso metering pumps come with rupture detection of the diaphragm as standard.

PTFE sandwich designed diaphragms mean that when the first diaphragm ruptures, the pump remains sealed and the rupture detection shuts down the pump before there are any leaks.

Diaphragm pumps do not require packing and do not require the same daily maintenance.

Low lifecycle costs because of extremely low failure-related costs and low energy costs.

Lewa-Nikkiso pumps have long service intervals which lowers maintenance and total cost of ownership.

The metering technology itself is accurate to up to .5% of the flow rate. Twice as accurate as the industry standard of 1%.

Lewa-Nikkiso metering pumps are compliant with API675 for pump designs for the oil and gas industry.

Modular design of the pumps mean that multiple heads and heads of different sizes can all be driven off of the one motor (up to 5 heads per motor) – which means that it is possible to simply and inexpensively build a custom solution for your application that other suppliers would require multiple pumps and motors to achieve the same result.

Lewa is able to supply a single pump or a complete custom engineered and tested dosing system or plant for the most rugged applications.

Finally, the heads can be located remotely for very toxic applications making motor maintenance much easier and safer for your maintenance teams.

What Next?

If you are planning to build, upgrade or add a metering pump system, the first step to getting the right performance is a no-cost, no-obligation “Design Needs Assessment.”

To schedule your “Design Needs Assessment” call 404-363-6000, or send an email to sales@pyebarker.com or go to https://pyebarker.com/contact/#quote

This post was brought to you by Pye-Barker Engineered Solutions in partnership with IndustryNet.

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Related Companies: Pye-Barker Engineered Solutions
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