08252016Thu
Last updateThu, 25 Aug 2016 4pm

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Technical

Basics of Elastomeric Seal Design

Basics of Elastomeric Seal DesignEngineers need critical design information when choosing a seal for a particular valve application. This includes:

  • Operating temperature and pressure ranges
  • What fluids or gases are being processed
  • The environmental conditions
  • Whether the seal is static or will be exposed to dynamic motion
  • Expected life of the seal

In a recent presentation at the Valve Repair Council’s seminar, Nathan Sowder, business development manager for oil & gas and chemical processing at Parker’s O-Ring Division, explained the basics of elastomeric seal design. Starting out with an overview of the various polymers used in seals, he compared the pros and cons of various reinforcing fillers, plasticizers, process aids and cure systems. A key component of seal performance is the compound that it is made of.


Problem-Driven Innovation

Developing Alternative Technology to Improve Product Performance

Problem Driven Innovation 2Industrial product engineering teaches us to understand the difference between problems and conditions. Control valve engineering in particular presents a variety of problems that interplay to reduce reliability.

Regardless of how the metering plug or the flow path is shaped, the fluid must make several turns to pass through a sliding stem, plug-in-seat globe control valve. Due to that design condition, damage from extended operation at high pressure drop is a problem. However, a solution to the problem is constrained by the condition, and the dominance of the condition stifles innovation in a mature product line.

Horizontal Knife Gate Valves: Challenges and Solutions

Horizontal Knife Gate ValveKnife gate valves are more commonly installed vertically, so why might a knife gate be positioned horizontally? Use of knife gate valves on the horizontal plane is more widespread than you might expect. For instance, horizontal installation would be beneficial when installing vertical pipes and encountering spacing issues, and when using various types of media. Knife gates were originally designed to be situated vertically, so there are certain considerations to be made and challenges to face when installing valves horizontally, especially valves 18 inches and larger.

Strategies for Successful SIS Valve Diagnostic Implementation

Control RoomEnd users and contractors alike strive to design and operate plants with maximum plant safety and efficient production, and safety instrumented system may be required to reduce risk to an acceptable level. At times, diagnostics beyond valve functional proof tests such as partial stroke tests are implemented to provide additional diagnostic coverage necessary to meet a target SIL or desired proof test intervals. Alerts and test trends can also provide predicative diagnostics. This article explores considerations when implementing diagnostics to maximize usage and benefits.

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