Flange insulation kits are the most widely used form of controlling losses due to corrosion. They can be used to control stray electric currents in piping at oil, gas, water, refinery and chemical plants to increase the effectiveness of Cathodic protection systems and confine or eliminate electrolytic corrosion. Each set is clearly tagged with the flange size, pressure rating, type of insulating sleeve and whether it is a single washer of double washer set
Type of Gaskets
Type E
Type e is a full-faced gasket with the same outside diameter as the flange and precision cut bolt holes. This design facilitates proper alignment of the gasket during installation. Type E gaskets are available in plain face or Neoprene face phenolic as well as a variety of high temperature materials.
Type D
Type D gaskets are specifically designed to fit into the ring groove of ring type joint flanges. They are manufactured of a medium weave, fabric-rein forced phenolic material and are sized to ANSI specifications available in basic oval as well as octagonal shape. Also available are BX gaskets with pressure rating to 15,000 psi.
Type F
Type F gaskets are made to fit the raised face portion of the flange only. As there are no bolt holes in the F gasket, the outside diameter of the gasket falls within the inside diameter of the bolt hole circle. Available in the same materials as the type E gasket.
Type G
Type G is available in both full faced (FF) and inside bolt circle versions (RF) and incorporates an elastomeric sealing ring in the gasket faces. Appropriate selection of insulating and sealing materials provides a versatile set with higher chemical and temperature resistance.
Products
Gaskets
- Phenolic
- Neoprene-faced phenolic
- SONFLON PTFE
- G7
- G10
- G11
- G11 with steel core reinforced
Sleeves
- Mylar
- Nomex
- G7
- G10
- G11
Sleeves
- Phenolic
- G7
- G10
- G11
Seals
- VITON
- NBR
- EPDM
- PTEE with spring energized
- Graphite
Other high temperature materials are available upon request.
Ordering Specifications
Gasket type
- D
- E
- F
- G
Washer
- Single washer
- Double washer
Standard
- Nomex
- Phenolic
- Mylar Sleeve
Type of sleeve
- Flange Size xx mm
- Pressure Rating xx mm
- Material of Seals (Type G)
INSULATING GASKET SPECIFICATIONS
| Plain
Phenolic |
Neoprene
Faced Phenolic |
SONFLON
PTFE |
G7 | G10 | G11/G11
With steel core |
|
| Dielectric strength Volts/Mil | 500 | 500 | 350 | 350 | 550 | 550 |
| Compressive strength psi | 25000 | 25000 | 2300 | 40000 | 50000 | 50000 |
| Water absorption % | 1.6 | 1.6 | 0.01 | 0.07 | 0.1 | 0.1 |
| Tensile strength psi | 20000 | 20000 | 1450 | 25000 | 45000 | 43000 |
| Operation temp ℃ | -54to+104 | -54to+79 | -196to+260 | -196to+232 | -196to+138 | -196to+176 |
SLEEVE MATERIAL PHYSICAL PROPERTIES
| Mylar | Nomex | G7 | G10 | G11 | |
| Dielectric strength Volts/Mil | 4000 | 400 | 350 | 400 | 400 |
| Water absorption % | 0.8 | N/A | 0.1 | 0.1 | 0.1 |
| Operation temp ℃ | -59to+149 | -54to+232 | -196to+232 | -196to+138 | -196to+176 |
1/8〃WASHER MATERIAL PHYSCIAL PROPERTIES
| Plain
Phenolic |
G7 | G10 | G11 | |
| Dielectric strength Volts/Mil | 500 | 350 | 550 | 550 |
| Compressive strength psi | 25000 | 40000 | 50000 | 50000 |
| Water absorption % | 1.6 | 0.07 | 0.1 | 0.1 |
| Operation temp ℃ | -54 to +104 | -196 to +232 | -196 to +138 | -196 to +176 |
SEALS MATERIAL PHYSCIAL PROPERTIES
| VITON | NBR | EPDM | PTFE/PTFE with spring Energized | Graphite | |
| Operation temp ℃ | -29 to 177 | -54 to 121 | -54to149 | -196 to 260 | -240 to 450 |
The seals material is designed for type G
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