Page 33 - Design Criteria.qxd

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Welcome to the Next Generation of Sealing Technology

PTFE Insert

RX Ring Type Joint

Special Ring Type Joints

For critical and non standard applications, where ring type joints are unsuitable

in their standard form, Flexitallic offers a range of specialized ring type joint

gaskets to suit the needs of the petrochemical industry.

Style R Ring Type Joints with PTFE Inserts

Oval and octagonal ring type joints can be supplied with a PTFE insert which

is located in a machined recess in the bore of the gasket. The insert reduces tur-

bulent flow across adjoining flanges and also eliminates flange/gasket erosion

which can occur with high velocity fluids.

Style RX Ring Type Joints with PTFE Inserts

Style RX ring type joints can also be supplied with PTFE inserts, in order to

reduce turbulent flow and eliminate gasket/flange erosion. The insert is spe-

cially designed with radially drilled pressure passage holes so that the self seal-

ing performance of the RX Ring Joint is not impaired.

Rubber Coated Ring Type Joints

This is an oval ring type joint which is totally enclosed in a nitrile rubber coat-

ing. The ring type joint material is usually soft iron or low carbon steel. This

type of gasket has three main functions:

• It is used in pressure testing to minimize damage to flanges.

• The rubber contact points provide additional seals while protecting the flange

surfaces.

• It provides increased assurance against corrosion, which can occur between

conventional ring type joints and the engaged surfaces of the groove.

Transition Ring Type Joints

These are combination rings which consist of two different sizes having the

same pitch circle diameter. They are used for sealing ring type joint flanges

where the mating flanges have different ring groove diameters. Transition ring

type joints are available with either oval or octagonal facings.

Blind Ring Type Joints

Special ring type joints can be manufactured to blank off flanges and pipework.

They consist of standard ring type joints with integral solid metallic centers.

Flange Guards

Flange guards are supplied to suit all API, ASME, BS and MSS SP44 ring type

joint flanges. Flange guards are manufactured from closed cell neoprene foam,

which compresses readily under load. Once assembled, they protect the outside

diameter of the ring type joint from corrosion, i.e. salt spray.

Style R with

PTFE Inserts

Style RX with

PTFE Inserts

Rubber Coated

RTJ

Transition RTJ

Blind RTJ

Flange Guards