Flange Insulating Gaskets
Corrosion has long been natures most destructive element, but with Lone Star flange insulation products this costly profit robbing item can all but be eliminated. Lone Star engineered insulation products, of consistent high quality, can be used to control and confine electrolytic corrosion in almost every piping system.
Lone Star insulation products are manufactured from materials with superior high dielectric strength, low water absorption and chemical stability to maintain the high quality required in refinery and chemical plant applications. Hydrocarbon exposure, weathering and salt water are no problem for Lone Star insulating materials.
Lone Star quality assurance and high production rate allow our customers to economically protect and lengthen the service life of equipment with little or no down time due to electrolysis.
Lone Star manufactures a full line of standard flange insulation sets including Type F (Ring) gaskets, Type E (Full Face) gaskets and Type D (API Ring Joint) gaskets. Lone Star Type F and E gaskets are manufactured from 1/8" thick fabric based phenolic (Nema Grade CE) sheet with either no coating (plain faced) or a Nitrile rubber coating on both faces. Type F & E gaskets are also available in Compressed Non-Asbestos with superior electrical insulation qualities.
Either polyethylene or phenolic sleeves are available with these insulating sets. Polyethylene sleeves are standard and will be furnished unless otherwise specified.
Insulation Set
Flange insulating sets are packaged for one flanged joint, including gasket, sleeves and washers. Each flange set is securely packaged in a cardboard box, clearly labeled as to size, ASA Rating, style and material.
Type F gaskets are designed to fit the raised face portion of flanges. The outside diameter of the gasket is slightly smaller than the inside diameter of the bolt hole circle. The outside diameter is designed for alignment by the insulating sleeves. The central gaskets are available in the same materials as Type E. Upon installation, it is recommended that tape be wrapped around the outside of the flange to prevent foreign material from lodging between the exposed portions and causing "shorting out" of the flanges.
Type E gaskets are designed for full protection of flanges, and have the same outside diameter as the flange. Each gasket has precision-located bolt holes. Upon installation, it is recommended that tape be wrapped around the outside of the flange to prevent foreign material from lodging between the exposed portions and causing "shorting out" of the flanges. All Type E gaskets are easily centered with the flange inside diameter. Gaskets with slightly larger outside diameters are available on request.
Type D gaskets are insulating ring joint gaskets made to fit the ring groove of Ring Type Joint flanges. The Type D central gasket is made of medium weave fabric-reinforced phenolic, manufactured to ASA (ANSI) gasket dimensions. Properties are similar to those of phenolic flat central gaskets and are available in the basic octagonal shapes. Oval shapes can be ordered by special request. When installing Type D gaskets, it is also recommended that tape be wrapped around the outside of the flange to prevent foreign material from lodging between the exposed portions and causing "shorting out" of the flanges. Alignment pins should be used whenever possible to assure proper alignment of flanges when installing all flange insulation sets. Pins should be a minimum of 3/32" (2.38mm) larger than the bolt size.
| Insulating Gasket Material |
Plain Faced Phenolic |
Nitrile Faced Phenolic |
Non-Asbestos |
| Water Absorption In Percent |
1.10% |
0.45% |
--- |
| Hardness Rockwell M |
105 |
--- |
--- |
| Tensile With Grain psi |
13,000 |
13,000 |
--- |
| Compression Flatwise psi |
39,000 |
39,000 |
--- |
| Flexural Flat W/Grain psi |
22,000 |
22,000 |
3,000 |
| Dielectric Strength VPM |
200 |
200 |
400 |
| Dielectric Constant |
4.5 |
4.5 |
--- |
| Max. Cont. Operating Temp. |
225躘/107讈 |
175躘/79.5讈 |
700躘/371讈 |
| Nema Grade |
CE |
--- |
None |
| Insulating Sleeve Material |
Dielectric Strength volts/mil |
WaterAbsorption % |
Max ContinuousOperating Temp. |
| Integral |
450 |
0.90 |
180佝 / 82低 |
| Mylarr |
4,000 |
0.80 |
300佝 / 149低 |
| Nomexr* |
720 |
--- |
600佝 / 315低 |
| Phenolic** |
140 |
2.00 |
225佝 / 107低 |
| Polyethylene*** |
400-500 |
0.01 |
150躘 / 66讈 |
All insulating sleeves are 1/32" (.794mm + .000 - .010") thick.
Note:
* Available on special request for high temperature applications.
**Made of NEMA (National Electrical Manufacturers Association) grade laminated phenolic.
***Low moisture permeability and absorption rate make sleeves excellent for wet application. Flexible and tough. r Dupont trademark
Insulating Washers
| Material |
Dielectric Strength volts/mil |
Compressive Strength (Flatwise) psi |
Flexural Strength (Flatwise with grain) psi |
Max. Continuous Operating Temp. |
| Non-Asbestos |
400 |
--- |
3,000 |
700佝 / 371低 |
| Phenolic |
200 |
39,000 |
22,000 |
225佝 / 107低 |
Flat insulating washers, placed on the studs between the flange and flat steel washers, manufactured from the customer's choice of either: 1/8" (3.175mm) thick fabric-reinforced, laminated phenolic or non asbestos. These washers may be used with polyethylene or phenolic sleeves. Note: If not specified, washers will be plain faced phenolic.
Steel Back-Up Washers
Steel washers fit between the nut and the insulating washer to prevent damage to the insulating washer. The outside diameter is sized to fit within the bolt facing on ASA standard flanges. Steel washers are 1/8" (3.175mm) thick for extra strength. Insulating washers are not necessary on both sides of the flange, but it is a good practice. For high temperature applications of these products, consult a Lone Star representative or your distributor for recommendations.
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