|The spiral-wound sealing element of a Teadit 913 gasket consists of a thin metallic strip and a soft non-metallic filler that are simultaneously wound on a rotating mandrel. The metal strip is preformed with a chevron profile which allows the gasket to act as a spring between the flanges. Further, the metal strip provides the basic structural element for the gasket while the non-metallic filler material seals small imperfections on the flange surfaces.
The density of the gasket can be varied by changing the winding pressure and/or the filler thickness. As a general rule, thin fillers and higher winding pressures are used to produce high pressure gaskets.
In accordance with ASME B16.20b-1997 three plies of metal with no filler are wound on the inner and outer diameters of the winding. Also, the specification requires a minimum of 3 welds on both the inner and outer plies of the winding.
Teadit Style 913 gaskets have a spiral-wound sealing element with a solid metal outer ring. The sealing element is nominally .175” thick while the ring is nominally 1/8” thick.
The purpose of the outer ring is threefold:
Teadit's technical expertise, automated manufacturing processes and skilled craftsmanship guarantee consistent, dependable gaskets. Recognizing how costly a gasket failure can be, they employ precise quality assurance standards from the time raw materials enter the plant to the time the Universal Style 913 gaskets leave the plant.
In accordance with ISO9002 procedures, they maintain traceability records for all incoming materials of construction as well as components as they proceed through the manufacturing process. Teadit Spiral-wound gaskets are certifiable to ISO9002 standards.