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Flange Insulation Gsket Sets are usd to solve the sealing and insulating problems of flanges, and to control losses due to corrosion and leakage of pipelines. They are widely used to seal flanges and control stray electric currents in piping at oil, gas, water, refinery, and chemical plants, to increase the effectiveness of cathodic protection systems.

Application of Flange Insulating Gasket Sets

• To limit the extent and cost of cathodic protection current to only those pipes that need to be protected from the main cathodic protection system

• To electrically "split up" long pipelines into distinctive cathodic protection systems

• To isolate a pipeline to ensure that cathodic protection or stray electricity currents do not cause increased corrosion, or cause a hazard

• To isolate piping systems where dissimilar metals are present

• To eliminate static loading charge transfer in discharge or loading operations at oil storage terminals

Insulation Gasket Type:

Type E (Full Face Gasket)

This gasket kit provides complete protection of both flange faces. The gasket has same outside diameter of flanges. This feature will prevent collection of foreign matter between the flange faces to ensure complete cathodic isolation.

Type F (Ring Type Gasket)

This gasket is manufactured to fit only the raised face surface of the flanges. Outside diameter of the gasket is designed to be slightly less than the inside diameter of the bolt circle. It is recommended that the flanges be wrapped to prevent foreign material from "shorting out" the flanges.

Type D (RTJ Gaskets)

To fit RTJ flanges. They can be produced according to ASME and API flange standard.

Sealing Gasket Physical Properties

Property	Plain Phenolic	Neo-faced Phenolic	Silicone Glass G-7*	Epoxy Glass G-10	Epoxy Glass G-11
Dielectric strengths, Volts/mil	500	500	350-400	550	550
Compressive strength, psi	25,000	25,000	40,000	50,000	50,000+
Water absorption, %	1.6	1.6	0.07	0.10	0.10
Insulating Resistance, Meg Ohms	40,000	40,000	2,500	200,000	200,000
Flexural strength, psi	22,500	22,500	27,000	45,000	43,000
Operating temp, ºF	-65 to +220	-65 to +175	-292 to +450	-292 to +280	-292 to +349
Operating temp, ºC	-54 to +104	-54 to +79	-180 to +232	-180 to +138	-180 to +176

* = G-7 material should not be used with hydrocarbons, not even trace amounts.

Seal Element Temperature Limits

?Nitrile	Viton	Teflon	Neoprene	EPDM
-65 to +250°F	-20 to +350°F	-292 to +450°F	-40 to +248°F	-65 to +248°F
-54 to +121°C	-29 to +177°C	-180 to +232°C	-40 to +120°C	-54 to +120°C

Consider both retainer and seal element temperature limits togetherfor YZT-110 and YZT-120 Sealing Gaskets.

Flange Insulation Gasket Set is becoming more and more important in the industry of oil&gas, petroleum, chemical, refinery.