One of the popular choices for seals for the intense, high pressure, corrosive, high temperature environments found in the oil and gas industry is a combination of a PTFE spring-energized seal with a PEEK back-up ring (BUR) installed on the downstream side of the seal gland. Why?
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Cryogenic seals must not only handle unbelievable low temperatures, but also perform under high
pressure conditions. If you aren’t familiar with cryogenic seals, a cryogenic seal is a special type polymer seal used with media at temperatures below -238°F and down to -460°F (absolute zero). Cryogenic seals can be found in a variety of industries, from LNG compressors and loading arms in the petroleum industry to rocket propulsion systems in the aerospace industry.
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Because of the wide variation in where wind turbines are located, seals are expected to operate under temperatures between -40°F in the Artic to 140°F as a maximum standard operating temperature. Wind turbines are exposed to UV and ozone, vibration, and high stresses. Wind turbine parts are expected to last for twenty years a considerable challenge for such rigorous conditions, but a challenge that is being met. One area where these issues are being addressed is in the design and retrofitting of seals.
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The medical and pharmaceutical industries face tough challenges when it comes to sealing solutions. In this article, we are going to talk about how spring-energized PTFE and UHMW seals can help with three of those challenges.
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Spring-energized seals are an effective sealing solution for both dynamic and static applications. The sealing element itself achieves a seal at low pressures, and when pressures increases the seal is made tighter as the spring engages. The spring also compensates both for eccentricity and wear on the seal jacket, and increases the natural resilience of the seal jacket. This results in an extremely efficient sealing system.
When PTFE and UHMW materials are used for the seal jacket, you have a spring-energized seal that performs with distinction under high pressures, in extreme temperatures, has ultra low friction, and is quite chemically inert. So what does the mean for the food and dairy industry?
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Bearings and bushings can be found in almost every step in food or dairy processing industries
. Polymers are a popular choice for bearings and bushings in the food and dairy industry, both at the design stage and when retrofitting. Because they are greaseless, the can provide a more sanitary environment for food processing. They dont require the maintenance that metal bearings and bushings require, thus reducing downtime for maintenance. Their durability results in longer mean times to failure. They are usually much more resistant to corrosion and much less chemically reactive than metal bearings and bushings. They also weight much less than equivalent metal bearings and bushings.
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INTRODUCTION:
When you are trying to select an appropriate polymer for use as a wear component, you consider
things like low friction, dimensional stability, ease of installation, chemical compatibility, durability, toughness, dry-run capabilities, etc. Sometimes, however, the constraint that drives your choice is service temperature. In this article, we are going to look at three material options for applications where the service temperature exceeds 400°F.
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Engineers are turning to molded plastic bushing and bearings as a replacement for powdered and sintered metal wear components. In this article, we are going to take a look at four specific reasons why.
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Torlon is a high performance amorphous thermoplastic, also known as polyamide-imide. It has become a popular choice for labyrinth seals, especially in the area of reciprocating compressors. In this article, you will be reminded of six things you need to know about Torlon.
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When selecting the material for a labyrinth seal to be used in a reciprocating compressor, thermal 
properties can be a major concern. Since plastics behave differently from metals, there are certain thermal properties that you need to consider when using a thermoplastic labyrinth seal. In this article, we are going to look at four key thermal properties you need to investigate, focusing on two of the most common choices for polymer labyrinth seals: Torlon and PEEK.
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