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NETZSCH multiple screw pumps deliver superior asphalt handling
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NETZSCH multiple screw pumps deliver superior asphalt handling

NETZSCH multiple screw pumps deliver superior asphalt handling

Leading screw pump manufacturer’s smart technology surmounts challenges

Sometimes mined, but most often manufactured, the transportation and handling of asphalt is a challenging enterprise. Asphalt in the latter form is a carefully extracted residue resulting from the distillation process of selected crude oils like petroleum.

As difficult to work with as it is versatile, it’s a sticky, often chemically aggressive media, a highly viscose liquid material requiring reliable, safe and knowledgeable handling. For asphalt to be pumped and transported it must be heated and maintained to between 300-350F, with temperatures dictated by its mix of asphalt, sometimes called bitumen, and additional mineral aggregates. It takes a versatile pump to convey such a complex, challenging product, but NETZSCH NOTOS™ Multiple Screw Pumps (MSP) are uniquely suited to the job.

NETZSCH NOTOS™ Multiple Screw Pumps are manufactured to handle high viscosity
NETZSCH NOTOS™ Multiple Screw Pumps are manufactured to handle high viscosity.

A versatile pump designed for multiple asphalt applications

The most common use of asphalt is on roads and sidewalks, with 85% of it employed for paving surfaces. It’s also routinely used to make roof shingles, printers ink, lubrication oils, waterproofing materials, and medicines. Pumps specially made for asphalt conveyance, either after the distillation process or during the mining process, must be intelligently engineered to handle its unique composition and characteristics. NETZSCH’s NOTOS MSPs are required to reliably move low to high viscosity media—everything from light fuel oil to viscous asphalt. These pumps are constructed with housing jackets protecting the mechanical steel so that when hot steam is added to maintain the asphalt media’s temperatures in an idle pump, their steel base remains intact and functioning smoothly.

The 2NS and 4NS: Ideally suited for asphalt conveyance

Two NETZSCH NOTOS Multiple Screw Pumps are manufactured using wear-resistance materials specifically designed to handle the robust wear and tear of transporting a semi-abrasive material like asphalt: the 2NS and 4NS. The 2NS, a two-screw pump, is suitable for light to heavy lubricating materials with medium to high viscosity. It has a maximum capacity of 2,200 gallons a minute and a maximum pressure capability of 236 PSI. A robust, cartridge designed pump, its housing design is constructed of fabricated steel, and the entire outside diameter of the pump is heated. That’s important because the full housing heating jacket maintains a good flow of heat to the seal chamber—reducing opportunities for mechanical seal problems sometimes found in competitor’s pumps. Additionally, the 2NS pumps, and all NOTOS MSP pumps, reduce the potential for seal leakage. Hydraulically balanced, the 2NS offers quiet, pulsation-free flow and a reliably long lifetime of service.

NETZSCH’s NOTOS 4NS model, a higher capacity pump, gets the job done faster. That makes it a popular choice to handle big assignments like the on-and-off loading of asphalt on ships in port. The faster the material can be moved, the less the overall dock time, translating to higher savings for the shipper. An externally timed, four-screw pump, the 4NS is designed and manufactured to convey a wide range of viscosities. The pump is a non-contacting design, which means there is zero contact between the flanks of the screws, or between the outside diameter of the screw and the inside diameter of the liner.

“The 4NS is a beast of a pump,” says Carey Pendarvis, NOTOS- Multiple Screw Pump Sales and Product Manager at Netzsch Pumps North America, LLC. “It is able to pump a wide range of viscosities, from 50% gas, with no modifications to the seals, to 50,000 cst oil, so it is a high capacity, high pressure, problem solver.” Engineered to manage low to high viscosity, the 4NS can pump lightly abrasive products. Both the 2NS and the 4NS operate at a nominal motor speed, eliminating the need for a gearbox or V belt drive, and are backed by a generous three year manufacturer’s warranty.

The 4NS is designed and manufactured to convey a wide range of viscosities.
The 4NS is designed and manufactured to convey a wide range of viscosities.

The most energy efficient options available for asphalt applications

Already an attractive choice for handling difficult materials like asphalt, the 2NS MSP line also delivers substantial energy savings. NETZSCH’s High Efficiency Unique Design (HUED) also features a cartridge design, and complete housing jacketing. Bushings supporting the screw’s outside diameter allow zero contact between screws and the liner, reducing wear while minimizing the need for costly maintenance and repairs. Users can lower the temperature of their asphalt by 25 degrees F, a dramatic 7% energy reduction, as compared to using a centrifugal, gear or sliding vane pump. What does that mean in savings? In a 3 million gallon 3″ insulated tank, that 25-degree reduction translates to energy savings of roughly US$40,000 a month. A 3 million gallon non-insulated tank would see an astonishing $120,000 per month saving in energy bills!

Quality engineering technology improves pumping efficiency and safety

Quality engineered and manufactured to the highest standards, NETZSCH MSPs have been answering asphalt challenges for 35 years, effectively reducing the costs of ownership by delivering product reliability that minimizes expensive maintenance and extends service life. Whether the asphalt conveyance is for rail car on-and-offloading, tank-to-tank transfer, ship transport or any other challenging application, NOTOS MSPs are built to operate efficiently, reliably and safely while consuming less energy.

Post source : NETZSCH

About The Author

Anthony has worked in the construction industry for many years and looks forward to bringing you news and stories on the highways industry from all over the world.

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