Compressive seals

In seals which are not pressure-energized, sealing force is provided by the residual stress in the compressed seal, so that stress relaxation becomes an important factor. Even for more common simations using pressure-energized seals, residual stress is required at initial start-up—or after a... 

Historically, one of two techniques has typically been used to seal a planar SOFC stack glass joining or compressive sealing. Glass was originally used because it is simple to make and apply. The first requirement for a rigid seal is that the seal s... 

Y.-S. Chou and J.W. Stevenson, Phlogopite Mica-Based Compressive Seals for Solid Oxide Fuel Cells Effect of Mica Thickness, Journal of Power Sources, 124, pp. 473 178 (2003). 

FIGURE 10.3 Construction of the carbon-zinc cells. The zinc chloride and Leclanche have the same construction except for the seal. The zinc chloride has a plastic-compression seal while the Leclanche has a poured hot bituminous seal instead of the plastic-compression seal shown. (Courtesy of Eveready Battery Co., St Louis, MO. With permission.)... 

Because the zinc chloride electrolyte is more acidic, the cell requires a stronger plastic-compression seal. The ingress of oxygen from the air would otherwise react directly with the zinc anode and shorten cell life. 

D 3910 D 4070 Practice for Design, Testing, and Construction of Slurry Seal Specification for Adhesive Lubricant for Installation of Preformed Elastomeric Bridge Compression Seals in Concrete Structures... 

This is a batch process that is made complex by the fuel cladding and radioactivity. A typical fuel assembly for a PWR contains about 250, 0.37-inch zirconium-clad rods 12-feet long containing in total about 1200 lb of U02. The assembled rods are mechanically sheared into 1- to 2-inch lengths and dropped into a perforated basket. This is placed in the dissolver tank where the uranium oxide is dissolved as discussed above. The basket then is removed from the dissolver, and the zirconium hulls and associated hardware therein are dumped into containers, compressed, sealed, and sent to transuranic waste storage. Ultimately, they will go to a disposal facility. 

Compression seal A seal which is attained by compressive force on the sealing material. 

In Eig. 2.12, the principle of compression sealing of membranes with a tubular configuration is depicted. The membrane tube is mounted in a metal end-cap and the space in between end-cap and membrane filled by the sealing material. Compressive forces are obtained upon increasing the temperature and the magnitude of these forces can be tuned by proper selection of the metal type and sealing material, based... 

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