Spiral Wound Gaskets in the Power Generation Industry

PowerGen
In today’s changing landscape, there are more options than ever in the power generation industry; from natural gas, fossil fuels, coal, and nuclear to renewable methods such as hydroelectric, wind, solar, and biomass.

To withstand the extreme temperatures and conditions of these applications, manufacturers depend on durable gaskets and sealing solutions.

The gaskets used throughout these plants must be able to handle a range of operating conditions and pressures in order to evenly distribute power across long distances.

Reliable gasket solutions allow companies to easily meet the needs of the communities they serve while staying ahead of the curve in power generation trends.

Spiralwound Gaskets: High-Performance Technology

seals-metallicSeal & Design’s Spiral Wound Gaskets (SWG) are manufactured according to ASME B16.20 standards with quality assurance to comply with API specifications Q1 and ISO 9001:2008.

These gaskets are crafted with a combination of various smart materials: a preformed metal strip alternates with a more compressible, soft filler material, allowing for a highly responsive and extremely tight seal.

To learn more about these innovative components and our spiral wound gasket offerings, contact Seal & Design or visit our website.

Silicone vs EPDM

EPDM

EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber commonly used in automotive and constructive industries but has a disadvantage of having a lower heat resistance.

Silicone

Silicone is an inorganic polymer used in many industries and applications with the advantage that it can withstand extreme temperatures and keep its physical properties. Silicone is safe to use in the food and beverage industry.

How is Silicone Manufactured?

Depending on the type of silicone being used there are numerous ways to manufacture it. Silicone can come in three forms: LSR (Liquid Silicone Rubbers), RTV (Room Temperature Vulcanisation), HTV (High Temperatur Vulcanisation)

Technical Comparison

  • Temperature – EPDM has a max temperature of 130°C compared to silicone which can reach temperatures of 230°C and 270°C for high-temperature silicones.
  • Elongation – Silicone is seen as the stretchier rubber hence why it is used as vacuum membranes and has a tear resistance and elongation of up to 800% and can stay flexible up to -60°C.
  • Oil Resistance – both materials are prone to swelling
  • Environmental Resistance – Both EPDM and Silicone can withstand general weathering, Ozone, and UV
  • Tear Strength – EPDM is seen as the more durable rubber

Maximum Hot and Cold Temperatures for EPDM and Silicone

Hot Cold
+130°C EPDM starts to degrade -40°C EPDM reaches brittle point
+230°C Silicone starts to degrade -60°C Silicone reaches brittle point

Varying temperatures (hot or cold) have negative effects on all rubbers, particularly when heated.

silicone-heat-diagram

It is important to choose the right material

Silicone is superior when it comes to needing mechanical strength under intense heat and cold resistance as well as being flame resistant. It is important to look at all of the factors that these materials will be subjected to when looking to choose what rubber will be used.

To learn more about Silicone, click here.

To learn more about EPDM, click here.

EMI Shield Seal Gasketing

shield_seal_gasketing3Shield Seal Strip is available in various material combinations and sizes. The versatility of materials and sizes provides assurance of protection against weather conditions including temperature extremes as well as protection against Electro Magnetic Interference and Radio Frequency Interference leakage. The material used conforms to the military specifications.

The elastomers (Neoprene or Silicone) are available with or without an adhesive backing. Adhesive backing on the elastomer is often preferred due to the ease of strip mounting The knit wire meshing is available in various wire materials with Monel and Ferrous material being the most popular. Double Shield Seal materials are available for added shielding effectiveness.

The Shield Seal Strip is used in applications such as electronic cabinets where this type of material is utilized around the doors of the cabinet to seal off stray EMI signals. The shield Seal Strip is also used extensively to shield electronic boxes of various sizes and shapes.

Shield Seal Stip with adhesive backing is a convenient method of getting the optimum combination of materials for engineering or prototype models. In production, it is more convenient and economical to have the complete gasket manufactured with the necessary mounting holes, compression stops, and other special mechanical consideration incorporated. Each gasket would be complete and ready for installation thereby increasing reliability and reducing labor costs during assembly of the end product.

Learn more about Seal & Design’s EMI / RFI offerings

Viton® O-Rings

logo-vitonViton® (fluorocarbon rubber, FFKM) has excellent resistance to high temperatures, ozone, oxygen mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals making it a good choice for an o-ring material.

Viton® is a synthetic rubber and fluoropolymer elastomer, which is commonly used in O-rings and molded or extruded products. There are four families of Viton® polymers, with a varying fluorine content between 66% and 70%. There are the main grades are A (Dipolymers of VF2/HFP); B (Terpolymers of VF2/HFP/TFE); F (Terpolymers of VF3/HFP/TFE); and specialty types (such as GLT, GBLT, GFLT & Viton® Extreme).

Low-temperature resistance is normally not favorable and for static applications is limited to approximately -15°F (-26°C) although in certain situations it is suitable down to -40°F(-40°C). Under dynamic conditions, the lowest service temperature is between 5°F and 0°F (-15°C and -18°C).

Gas permeability is very low and similar to that of butyl rubber. Special fluorocarbon compounds exhibit an improved resistance to acids, fuels, water, and steam.

Viton_V91A_ORings

Attributes

  • Excellent Heat Resistance
  • Excellent resistance to oils and chemicals
  • Low compression set
  • Good fuel resistance
  • Excellent ozone and weather resistance (oxidation, sun, climat conditions, fungus, mold)

Applications

  • Engine oil seals
  • Fuel systems
  • High-Temperature Seals
  • Petrochemical Systems

Seal & Design is a leading supplier of Viton® O-rings and custom molded seals. We offer both genuine Viton® and standard fluorocarbon materials for general-purpose and high-performance applications. Selecting the type of Viton® that best fits your application is important, but it isn’t complicated, and help is available from Seal & Design. We also offer gaskets made out of Viton®.

For more information visit Seal & Design’s Website.

Flange Analysis

Are you experiencing product problems due to unsatisfactory gasket performance or failure?
Do you have high maintenance or service costs due to leaks and blowouts?
Do you think you could seal with less expensive materials, but aren’t sure they will perform?

Introducing: Joint Imaging and Flange Analysis

The combination of advanced imaging technology and experienced sales engineers provides Seal & Design Inc. with the ability to analyze your problem and provide the solution. Below are a few examples of how we have used our advanced capabilities to solve customers’ problems:

  • Selected a material for an OEM pneumatic tool manufacturer that alleviated a chronic service problem. Tools were being returned weekly for gasket replacement. Seal & Design Inc. Analyzed the flange and recommended a sealing solution that stopped the blowouts.
  • Pinpointed several instances where applications were utilizing inappropriate materials. After testing and evaluating the data from alternate materials, Seal & Design Inc. was able to identify and provide the gaskets best suited to the applications’ requirements and stop the leaks.
  • designed custom engineered gaskets to overcome structural limitations of cast and machined flanges. Altering the gasket can require far less cost and save expensive down time.

How It Works

A thin, pressure sensitive tactile film is placed in your application along with the current gasket and torqued to the current specifications. This film is then removed and analyzed to provide a thorough report of the distribution of pressure levels throughout your application. Available analysis includes statistical reporting of pressure distribution, load variance, pressure histograms, and more. Seal & Design’s sales engineers will evaluate the results and suggest options, such as beaded gaskets, to correct your leaking problems.

Material Splitting

bun-splitting

At Seal & Design, we have the unique capability to split master rolls of material into custom thickness at high tolerances. This makes us extremely competitive in weather stripping, insulation, and other sponge/foam applications. Material splitting is an excellent complement to our lamination and gasket fabrication capabilities.

Gasket Material

Selecting the right gasket material is an essential step in the planning of your application. You will need to anticipate the way the material will stand up to a given process, and be able to count on the manufacturing of such material to be efficient and affordable.

Whether your material metal, fiberglass, or rubber, you can count on Seal & Design’s material splitting services to split your rolls with accuracy. We have numerous gasket fabrication capabilities that will suit any of your complex application needs.