5 FLANGES- METRIC SIZES_9 TABLE 3 – INNER RING DIMENSIONS FOR STYLE CGI TO ASME B16. CGI TO SUIT SMALL DIAMETER Centering in construction pdf OR SLIP-ON FLANGES_10 TABLE 5 – MAXIMUM BORE OF ASME B16. 20 TO SUIT LARGE DIAMETER ASME B16. Warehouses Buenos Aires, Argentina Brisbane, Australia Edmonton, Alberta, Canada Cartec Sealing Technologies, Inc.

Chemical Productions Lagos State, Nigeria Rotterdam, Netherlands Gasket Vedacoes Technicas Ltda. Introduction FIRST AND FOREMOST The concept of spiral wound gasket construction was originated by Flexitallic in 1912, inaugurating the beginning of a new era in safe, effective sealing. The primary purpose for this development was the increasingly severe temperatures and pressures used by U. Metal Strip Filler Material The necessity for a gasket to have the ability to recover cannot be over emphasized.

GASKET IDENTIFICATION GUIDE RING COLOR CODING For ease of identification, Flexitallic Spiral Wound Gaskets utilize a color coding system around the outside edge of the centering ring, thus permitting full identification of both the winding and filler materials. Light Green Stripe The gasket filler materials number of stripes placed at equal intervals around the centering ring. Non-sintered PTFE high-temperature, sealing material is comprised of chemically exfoliat- ed and thermally exfoliated vermi- This revolutionary new product simulates the structure of exfoliat- ed graphite but with one notable exception gaskets made with Thermiculite maintain their integri- ty, even at extreme temperatures. GASKET SELECTION What style of gasket should I select? Style CG – Utilizes an external ring which accurately centers gasket on flange face, provides additional radial strength to pre- vent gasket blow-out and acts as a compression stop. A general purpose gasket suitable for use with flat face and raised face class 2500.

Above class 600 an internal ring is recommended. SPECIAL GASKETS Gaskets of special design can be engineered and fabricated using the same basic fundamentals of Flexitallic Spiral Wound Gasket design and construction to cover a wide range of applications in installations for which there are no industry-wide standards. Special gaskets have been designed for valves, pumps, compressors, tur- bines, boilers, heat exchangers, etc. 1500 are identical within their respective nominal pipe sizes, therefore inventories need not be duplicated. For Style CGI – see Table 3 for Inner Ring dimensions. STANDARD INSIDE DIAMETERS OF INNER RINGS FOR STYLE CGI GASKETS TO ASME B16.

S FLANGES See Table 4 for small diameter screwed and slip-on flanges. CGI SPIRAL WOUND GASKETS This table shows the maximum bore of flanges for which the Spiral Wound gasket dimensions shown are recommended considering the tolerances involved, possible eccentric installation, and the possibility that the gasket may extend into the assembled flange bore. Model of centring for a ribbed dome structure at Albrechtsburg. On completion of the intended structure, the centring of whichever sort is removed called “striking the centering”, and work on pointing and other finishing continued. A simple arch centre suitable for single skin brickwork.

A centre for a flat segmental arch. The centring for a semicircular arch. Wikimedia Commons has media related to Centring. Whitney, William Dwight, and Benjamin E. You can help Wikipedia by expanding it. This page was last edited on 23 July 2017, at 00:54.

A chuck is a specialized type of clamp. It is used to hold an object with radial symmetry, especially a cylinder. The jaws are tightened up to hold the tool or workpiece. A few chuck designs are more complex yet, and they involve specially shaped jaws, higher numbers of jaws, quick-release mechanisms, or other special features. Some chucks, such as magnetic chucks and vacuum chucks, are of a different sort from the radially symmetrical mechanical clamps mentioned above. To chuck a tool or workpiece is to hold it with a chuck, in which case it has been chucked. Lathe work whose workholding involves chucking individual slugs or blanks is often called chucking work, in contrast to bar work or bar feed work.

Self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece. Because they most often have three jaws, the term three-jaw chuck without other qualification is understood by machinists to mean a self-centering three-jaw chuck. The term universal chuck also refers to this type. Sometimes this type of chuck has 4 or 6 jaws instead of 3. More jaws grip the workpiece more securely if it is truly cylindrical, and thin-walled work will deform less.

Four jaws are also useful for square bar work. There are hybrid self-centering chucks that have adjustment screws that can be used to further improve the concentricity after the workpiece has been gripped by the scroll jaws. This feature is meant to combine the speed and ease of the scroll plate’s self-centering with the run-out eliminating controllability of an independent-jaw chuck. The most commonly used name for this type is a brand name, Set-Tru.

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