Spiral Wound Gaskets
The TEADIT® plant has manufactured spiral-wound gaskets since 1965. It is located in the largest and most progressive industrial and metallurgical complex in Brazil.
In 1975, TEADIT® moved into its present, modern facilities. The plant was further enlarged in 1982 when TEADIT® merged with another company which was engaged in the manufacture of metal expansion joints, shock absorbers and special bellows. Today, TEADIT® is one of the largest fabricators of spiral-wound gaskets, expansion joints and bellows in the world.
This is simplest style of spiral wound gasket, consisting of a circular winding without centering or inner rings. Spiral wound gaskets Style 911 are mainly used in tongue and groove or male and female. They are also used in equipment with space and weight limitations.
Style 911-T has better sealability than a coventional heat exchanger double-jacketed gasket. However, a specially machined groove with an appropiate compression stop in needed for 911-T.
A style 911-M gasket is a sealing winding with an inner ring. The purpose of this ring is to fill out the space between the flanges, avoiding turbulence in the flow of the fluid or as a protection against corrosion or erosion. It is also used as a compression limit when the seating stress is greater than 30,000 psi (210 MPa).
Gaskets with PTFE filler have a tendency to inward buckle thus the use of an inner ring is recommended if the gasket is to be installed with a non-confined inside diameter.
The construction of this gasket is circular metal winding with an outer guide ring. The sealing element is made of the specified metal and soft sealing material. The standard pipe size gaskets are made to ASME B16.20 (see also style 913M). These gaskets are used in a very wide variety of applications.
The 913M is the standard spiral wound gasket with an inner ring. The purpose of this ring is to fill out the space between the flanges, avoiding turbulence in the flow of the fluid or as protection against corrosion or erosion. It is also used as a compression limit. Gaskets with PTFE filler have a tendency to inward buckle thus the use of an inner ring is required by ASME B16.20. Inner rings are also required with ASME standard spiral wound gaskets with flexible graphite fillers unless the purchaser specifies otherwise and some sizes and pressure class require inner rings regardless of filler material.
Style 914 spiral wound gaskets are windings in non-circular forms like oval, rectangular and square with rounded corners, diamonds, oblong or pear shaped. Style 914 gaskets are used in boiler handholes and manholes, equipment, engine head-gaskets and exhaust systems. Inner rings should also be used for many of these applications.