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Cheat Sheet on Surface Finishes and PTFE Spring-Energized Seals

Posted On April 01, 2016


PTFE Spring-Energized Seal Design

When designing a component that includes a spring-energized PTFE seal, it’s not enough just to specify all the seal parameters; another key part of the design is the surface finish of the mating surface.  In this article, we are going to review what surface finish is, discuss the effects of surface finish on seal life, and then go over recommended surface finishes for spring-energized PTFE seals.

 

For more articles on PTFE Spring-Energized Seals from the Advanced EMC Technologies Blog:

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Posted in: Polymer Seals, PTFE Seals, polymer solutions, Spring-Energized Seals, PTFE, PTFE Spring-Energized Seals

PTFE Spring-Energized Cryogenic Seals Revisited

Posted On January 29, 2016


Cryogenic Seals

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.

 

 

Other important articles on Cryogenic Seals from Advanced EMC Technologies:

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Posted in: Dynamic Sealing, Polymer Seals, Cryogenic Seals, PTFE Seals, polymer solutions, mechanical loading arm

3 High Performance Polymers for Wear Component Applications

Posted On December 19, 2015


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.

 

Here are some excellent blog posts here on polymer wear components::

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Posted in: advanced polymers, polymer solutions, PEEK

Six Things You Need to Know About Torlon Labyrinth Seals

Posted On December 05, 2015


High Performance Torlon

 

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.

 

 

Here are additional articles on Polymer Labyrinth Seals:

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Posted in: Sealing Solutions, Labyrinth Seals, advanced polymers, polymer solutions

Take a PEEK: Oil and Gas Industry New Sources

Posted On September 28, 2015


PEEK Polymer in Oil and Gas

As stated in the previous post Environmental Impact of PEEK in Oil & Gas in the "Take a Peek" series, the oil and gas industry of today is focusing on three main challenges:

  • minimizing environmental impact,
  • finding new sources for depleting oil and gas resources, and
  • maximizing efficiency.  

This second post in the series looks at how PEEK (polyether ether ketone) contributes to the search for new sources of oil and gas.

Other addtional informative posts on PEEK polymer components as excellent alternative source:

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Posted in: Polyetheretherketone PEEK, advanced polymers, polymer solutions

Polymer Sacrifice: Carbon Fiber Reinforced PEEK as a Wear Component Material

Posted On August 26, 2015


Metal Wear Component Replacement

 

In this article we are going to look at another fiber-reinforced polymer material that is being used to replace metal wear components in pump applications:  PEEK + carbon fibers.

 

 

For further investigation into polymer wear components check out these Advanced EMC Technologies Blog articles:


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Posted in: Polyetheretherketone PEEK, OEM Original Equipment Manufacturers, advanced polymers, polymer solutions, polymer wear components

Dummy’s Guide to Composite Materials for Wear Components

Posted On August 21, 2015


Polymer Wear Components:

 

Are you considering switching to polymer wear components?  Are you confused by the options on the market?  In this article, we are going to take a look at how fiber reinforced plastic (FRP) materials can be successfully used for wear components.

 

 

Need even more informtion? Check out these post from the Advanced EMC Technologies Blog:

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Posted in: Polyetheretherketone PEEK, advanced polymers, polymer solutions, polymer wear components

Polymer Rolling Element Bearings: Deep Groove Ball Bearings

Posted On July 29, 2015


Polymer Roller Bearings

Working principle for a ball bearing 
CC BY-SA 3.0

Radial Deep Groove Ball Bearings (also known as Conrad bearings) are some of the most commonly used ball bearings.  In deep groove ball bearings, the dimensions of the raceways are almost the same as the dimensions of the balls.  The grooves consist of circular arcs with a radius just a little bit larger than the ball radius.  The groove depth is typically ¼ of the ball diameter.  This geometry of the bearing to carry radial, axial, and combined loads.  However, they are used when the primary load is going to be radial.  Its ability to carry an axial load depends on how much clearance there is in the bearing after installation: if the balls are able to contact the groove at an angle, then they can support a radial load.

You can find them with either single or double rows. Double rows work well supporting moment loads that may be acting on the shaft. These bearings are usually not separable, and the raceway is continuous.  They are also not self-aligning, so it is important that they be correctly aligned when they are installed.  Also note that even if they are not going to be lubricated, deep groove bearings are going to need some type of seal or shield to protect them from contaminants that will compromise both their performance and life span.

 

More information on polymer bearings from Advanced EMC Technologies:

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Posted in: Polymer Bearings, advanced polymers, polymer solutions

What is a Rolling Element Bearing?

Posted On July 28, 2015


Anatomy of a Rolling Element Bearing

A rolling element bearing (which is a type of anti-friction bearing) involves the motion of two surfaces separated either by rollers or balls (the rolling elements) whose primary purpose is to reduce friction.  The typical rolling element bearing will consist of

(a) an inner race,
(b) an outer race (which together form the raceway),
(c) the rolling elements between them, and
(d) usually some type of cage (also known as a separator or retainer) to hold the rolling elements in place and prevent them from contacting each other. 

The only kind of rolling element bearing that does not have a cage is a called a full complement bearing.  The inner and outer race will have a groove in them, in which the rolling elements rest.  

Here are some additional excellent posts on bearings and bushings from Advanced EMC Technologies:

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Posted in: Polymer Bearings, Thrust Bearing, advanced polymers, polymer solutions

Bearing Basics: Facts Your Boss Hopes You Know about “Plain Polymer Bearings”

Posted On July 23, 2015


Plain Polymer Bearings

In this article, we are going to look at the different types of “plain” (or “plane”) polymer bearings.  Both spellings are correct, it’s only a matter of blogger preference.   “Plain polymer bearings” is preferred for this article.  Recall that the purpose of bearings in general is to:

  • support shafts,
  • reduce the friction between contacting surfaces,
  • and to constrain motion along one or more axes
There are different ways to classify plain bearings, and in this article we will look at one possible means of classification:  sleeved, flanged, and thrust bearings.   

Want even more Bearing Basics? Check out these articles from the Advanced EMC Technologies blog:

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Posted in: Polymer Bearings, Thrust Bearing, Plane/Plain Polymer Bearings, polymer solutions, Bearing Basics

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