Ethylene Manufacture of Engineered PTFE Products

Overview

Ethylene Manufacture of Engineered PTFE Products is unmatched in the manufacture of engineered PTFE products. Since its founding in 1950 and its DuPont lineage, Ethylene has become a global supplier of PTFE expansion joints, PTFE Dip Pipes, sight flow indicators, and custom fluoropolymer lined piping products. Ethylene products are considered the industry standard for demanding applications and are used by major chemical companies around the globe. When you need high performing, chemical resistant products there is only one company that has the reputation, experience and service to back it up – ETHYLENE™

The Products of Ethylene

Lined Pipe / Fittings Overview

Founded in 1950, Ethylene’s roots trace back to DuPont® and the pioneering development of PTFE lined products. In 1958, Ethylene was the first company to employ PTFE Isostatic Molding processes and also the first company to process pure unmodified PTFE for its lined piping products.

Competitors followed some three decades later. Today, Ethylene processes Fluoropolymers in more ways than any other company. Processes include: Dry & Wet Isostatic Molding, Paste Extrusion, Ram Extrusion, Rotolining, Injection Molding, Intrusion Molding, Melt Extrusion, Resin Transfer Molding, Compression Molding and Vacuum Forming.

ChemTite PTFE Lined Pipe

Pipe sections are lined with a heavy-walled isostatically molded PTFE liner with the following minimum PTFE wall thickness.

FLO-CHECK PFA lined ball check valve.

Flo-Check™ PFA lined ball check valves prevent the back-flow of liquids in pipelines, prevent siphoning of pumps and eliminates pump impeller rotation in opposite direction due to back-flowing media. Flo-Check’s PFA lining provides the ultimate in chemical and permeation resistance from (-)20°F to (+)350°F and all sizes are full vacuum rated.

Flo-Check™ is resistant to:

• All acids
• All solvents
• All organic and inorganic chlorides & sulfates
• All bleach solutions
• All phenols
• All caustics
• All peroxides

Ethylene Flexijoint

Ethylene’s Flexijoint expansion bellows have a proven record worldwide of handling the CPI’s most corrosive pipe stress problems. They are formed from isostatically molded, FDA approved, virgin PTFE resin to guarantee product purity and uniform thickness.

Ethylene Flexijoint PTFE expansion joints are flexible connectors and tremor barriers designed to compensate for misalignment, absorb expansion and contraction, and isolate vibration and shock in process piping, tanks and pumps. They also offer a low spring rate to protect stress sensitive FRP, glass or graphite equipment. Flexijoints are available in sizes 1/2″ to 42″ and from 2 to 12 convolutions for maximum movement. Flexijoint has almost universal chemical inertness, high and low temperature resistance, invulnerability to ozone and sunlight, outstanding flex life, and low acoustical impedance (sound dampening properties).

Flexijoint Distinctive Features

Pure 100% Virgin PTFE Resin

The unmatched performance of Flexijoint is due to its exclusive Fluoroforming™ process, a development of Ethylene. The Fluoroforming™ process employs only high molecular weight resin to utilize pure PTFE with no pigments or additives which might contaminate contacting fluids by leaching out, or to be vulnerable to blistering. In addition, high molecular weight with tightly controlled crystallinity, inherent in the Ethylene Fluoroforming™ process, results in lower permeation rates, outstanding flex-life and maximum tensile strength. Competitors which use paste extruded resin are NOT using Pure PTFE. They must mix a hydrocarbon such as Isopar™ to facilitate PTFE paste extruding.

Uniform Wall Thickness

Ethylene’s exclusive Fluorforming™ process guarantees multiple convolution walls of constant uniform thickness for any size. This relationship of heavy wall and geometry is one of the basic reasons for the outstanding performance of Flexijoints. Deep convolutions allow increased axial travel and also reduce the force necessary to produce movement or lateral misalignment. As a result, Flexijoints have a longer service life when compared to conventional blow molded or stretch molded expansion joints which introduce stress points and exhibit alarming thinning of the convolution wall and root. Note: Blow-molding is sometimes referred to as “contour” molding by some manufacturers.

T-Band™ Root & Sidewall Support

Flexijoint T-Band™ reinforcement on the outside of the convolutions supports the convolution root and sidewall for improved service life and increased safety in high pressure applications. As pressure and temperature increase, the sidewall of the PTFE convolutions conform to the contour of the T-Band, improving stability under pressure.

T-Band™ Protection From Over Compression

Flexijoint T-Band™ metal reinforcement on the outside of the convolutions not only contributes to the pressure rating of the Flexijoint but also limits the total axial movement in compression. The shoulders of the T-Band™ are designed to butt when maximum compression limit has been reached to provide protection from excessive compression for improved safety and increased service life.

LimitLinks™ Protection From Over Expansion

LimitLinks™ consist of stainless steel cables conforming to MIL-C5424 – the government specification for Aircraft Cable, at the ends of which stainless steel ball-shaped terminals are swaged. The opposite ends of each LimitLink™ are firmly anchored in the Flexijoint flanges in a manner which limits over expansion of the Flexijoint, but also leaves the terminals free to swivel as the flanges change position relative to each other during their adjustment to angular misalignment, parallel misalignment, purely axial motion or a combination of all three.

LimitLinks™ & T-Band™ Additional Benefits

LimitLinks provide easy installation even when the mating flange bolts don’t align. They also won’t get in the way and they never need to be removed for installation unlike competitors’ LimitBolt designed expansion joints which may void warranties. T-Bands cover approximately 75% of the outside of the convolution when not compressed to provide protection from external damage such as falling tools or weld splatter.

Flex Armor

Flexarmor bellows can be designed to meet a broad range of applications. The tables found in this section are for neutral length and axial movements are for standard units. Ethylene Corporation’s Flexarmor Flexijoint expansion bellows combine the high pressure rating of a metallic expansion joint with the high temperature and near-universal corrosion resistance of PTFE. They are designed for services where the unreinforced Flexijoint PTFE bellows is unsuitable.

Seamless, heavy walled, isostatically molded PTFE liners provide excellent resistance to permeation. This high integrity liner offers a superior alternative to the conventional PTFE spray coated or seamed liner. They are subjected to uncompromising quality control before and after lining of the bellows. Pressure ratings for Flexarmor bellows are as high as 300 psig. The metallic outer bellows features uniform wall thickness and multiple ply construction for increased flexibility. These bellows are available in most nickel alloys including Monel, Inconel and various types of stainless steels.

Available designs include: universal joints, hinged-pinned and slotted, and gimbal types. Versatile manufacturing techniques accommodate customization of Flexarmor bellows’ flanging, overall length, movements and spring rates. Flexarmors can be custom engineered for specific process requirements while maintaining high flex cycle fatigue life.

Ethylarmor – Dip Pipes and Spargers

Ethylarmor is a PTFE lined and covered armored dip pipe or sparger designed exclusively for the rigorous demands of agitating vessels or the high stress of injection. Also available is Ethylene’s Solid PTFE dip pipes and spargers for non-agitated services.

Ethylarmor – High Temperature Corrosion Resistance

Ethylene Ethylarmor Dip Tubes and Spargers combine the high temperature and near-universal corrosion resistance of PTFE with the mechanical strength of an encapsulated Schedule 80 carbon steel pipe for tough applications such as agitated reactors.

Ethylarmor – Durability

Ethylarmor Dip Tubes and Spargers pass both the ASTM F423 steam-cold water cycle test and a 10,000 volt electrostatic spark test, the industry’s most rigorous testing program. This virtually eliminates the possibility of heat-seal failure and resultant damage to the reactor’s fragile glass lining.

Ethylarmor – Design

A broad range of optional features are available to meet your process requirements. These include Diverters (to direct liquid/gas flow away or towards vessel walls), Extended Flares (to eliminate additional reducing flanges), Sparger, Anti-Siphon Holes, etc.

Source : www.dip-pipes.com

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