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White Paper - Asphalt

White Paper - Asphalt
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White Paper Asphalt Market Background and Product Overview Tuthill has over 75 years of experience manufacturing a wide range of positive displacement pumps that address many of the challenging applications in the asphalt industry. Tuthill offers positive displacement pumps in the circumferential piston, internal gear and external gear designs, ranging in capacity from .5 GPH to 550 GPM and available in iron, stainless steel, and other materials. Tuthill Pump products have established a reputation for reliability and durability in the equipment machinery and process industries. Tuthill is a leading manufacturer of positive displacement pumps that serve a variety of applications in the asphalt and related building materials industries. The Tuthill Technaflo Products include precise, low-flow pumps suitable for pumping additives and product modifiers. They are available in a variety of pump head materials of construction and are capable of adjustable flow rate with variable-frequency drives. The pumps can be combined with accessories and fabricated systems to meet a variety of chemical and process-feed requirements, Construction and Available Options for Asphalt Service Asphalt Industry Applications Since it’s discovery more then 5000 years ago, Asphalt/ has proved to be one of nature’s most useful and abundant materials. There are various other names used for this material; bitumen earth pitch, mineral pitch and petroleum asphalt. This petroleum by-product is The Tuthill HD Series is a circumferential piston pump capable of used for various different applications, of which the largest segments running dry without damage, handling a wide range of viscosities are: and slurries, and is a low-shear design. The design incorporates the • Road Asphalt use of externally-mounted, synchronized timing gears operating close clearance impellers with external shaft-bearing support. It is available • Roofing/Shingles (See notes on “filled asphalt”) in ductile iron and stainless steel construction as standard, with other • Waterproofing materials available on special order. Because of its no metal to metal • Softener in Rubber blends contact design, and availability in hardened iron wetted parts, the ® HD pump has been successfully used in high concentration limestone Tuthill GlobalGear and HD pumps have been successfully applied to numerous applications throughout the Asphalt industry, including: filled asphalt applications. • Bulk Transfer GlobalGear® is a heavy-duty internal gear pump that features • Loading/Unloading of Tankers, (highway and rail types) an external thrust bearing and heavy-duty bracket for supporting • Transferring from main storage-tank to production tanks bearings and mechanical seals. The GlobalGear® internal gear design • Feeding of production installation, e.g. production of pump offers a heavy-duty modular design capable of back pullout roof shingles. access to the fluid chamber without disturbing the pipe. The modular design features also minimize maintenance costs and inventory • Mobile road repair equipment requirements compared to other internal gear pumps. GlobalGear Asphalt is normally a solid or semi-solid material at room temperature. pumps are available in cast iron, stainless steel, and other materials upon request. In most applications asphalt is pumped at elevated temperatures of 270 ºF to 400 ºF to reduce the viscosity (100 to 7500cPs) and ease Lower flows such are encountered with equipment forced oil processing. lubrication services are addressed with the L & C series of products that include a wide range of integral close-coupled pumps and To maximize operational efficiency of pumps in asphalt service, Tuthill motors, and CC Series of flanged-mounted pumps for use with NEMA has incorporated a range of options that make products ideally suited C faced motors. on various asphalt applications. Tuthill provides the option of a jacketed bracket and jacketed cover on select GlobalGear® models. A complete two-piece pump jacket is available for the HD pump. These jacket options are suitable to be used in combination with a thermal fluid (hot oil) or steam. Excellence at work. Excellence in life.

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Tuthill recommends using heating jackets to keep the asphalt product Temperatures 400ºF to 450ºF at design temperature during transfer. Before start-up, the pump • High temperature package should be pre-heated so it is at operating temperature. Insulation on • High temperature clearance pumps and piping, as shown in figure 1, is important to avoid colds • Bronze or HT carbon bushings spots and the potential of product solidifying. • High temperature packing GlobalGear® features modular build on flanges as standard for the range. Oversized flanges can be installed on the pump housing to...

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Sealing of Asphalt Pumps Currently, packed gland shaft sealing is the popular choice on asphalt pumps. The main disadvantage of packed gland pumps is they inherently “weep” base fluid. Recent environmental regulations require a reduction of the “leaking” from process equipment. Depending on the application, other sealing types are used such as component mechanical seals, cartridge mechanical seals or lip seals. GlobalGear® pumps utilize a standard seal housing, designed to accommodate a variety of seal types. Some things can be done to improve leakage performance with packing. Use offilled...

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