Specialized

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RUBBER COATED - RING JOINT GASKETS

This is an oval Ring Joint gasket totally enclosed in a nitrile rubber coating. The Ring Joint gasket 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 Joint gaskets and the engaged surfaces of the groove.

CUSTOM MANUFACTURED SEALS

DAN-LOC supplies gaskets, with or without inserts, and other specialized machined metallic components to suit subsea and wellhead equipment. For critical and non-standard applications, DAN-LOC offers a range of specialized Ring Joint gaskets to suit the needs of the petrochemical industry.

BLIND RING JOINT GASKETS

Special Ring Joint gaskets can be manufactured to blank off flanges and pipework. They consist of standard Ring Joint gaskets with integral solid metallic centers. Blind Ring Joint gaskets can be supplied in all standard materials and exotic alloys. For further information on the specialized Ring Joint gasket products, please contact DAN-LOC's sales department.

TRANSITION RING JOINT GASKETS

These are combination rings which consist of two different sizes having the same pitch circle diameter. They are used for sealing Ring Joint flanges where the mating flanges have different ring groove diameters. Transition Ring Joint gaskets can be manufactured from standard materials, as well exotic alloys. Transition Ring Joint gaskets are available for either oval or octagonal facings. Transition Ring Joint gaskets are not in accordance with API specifications.

STYLE R RING JOINT GASKETS WITH PTFE INSERTS

Oval and Octagonal Ring Joint gaskets can be supplied with a PTFE insert which is located in a machined recess in the bore of the gasket. The insert is specially sized to suit the flange bore and pipe schedule. On assembly, the insert is completely trapped between the make up of the flanges, filling the annular space between the inside diameter of the gasket and the bore of the flange. The above arrangement reduces turbulent flow across adjoining flanges and also eliminates flange/gasket erosion which can occur with high velocity fluids.

STYLE RX RING JOINT GASKETS WITH PTFE INSERTS

Style RX Ring Joint gaskets can also be supplied with PTFE inserts, in order to reduce turbulent flow and eliminate gasket/flange erosion. The insert specially designed with radially drilled pressure passage holes so that the self energizing performance of the RX Ring Joint gasket is not impaired. The insert is located between the inside diameter of the Ring Joint gasket and the bore of the flange, as shown on the right. On assembly, the insert is completely trapped between the make up of the flanges, filling the annular space between the flange bore and gasket.