The HPS is a high strength and high reliability flange gasket designed for electrical insulation and sealing in very critical service applications. The gasket is manufactured using a composite seal retainer material bonded to a high integrity metal core, 316 Stainless Steel is standard. The spring energized PTFE seal offers excellent sealability even at low loads.
Materials
General Characteristics
HPS Design
The design of the HPS gaskets incorporates a high-strength reinforced epoxy laminate bonded to a 316 stainlesssteel core as standard (other core materials available). This design results in the gasket having the strength of a traditional metallic gasket while at the same time allowing complete electrical insulation between the flange faces.
PTFE Spring-energised seals are installed into machined grooves to provide a pressure-activated sealing system that allows the HPS to be used as a high pressure insulating gasket.
(Viton o-rings also available if specified)
Electrical Insulation
The HPS distinguishes itself by providing electrical flange insulation in a high-strength gasket.
The HPS significantly reduces the potential for electrical conductivity between two flange faces by providing a non-conducting, non-metallic interface.
This eliminates potential corrosion resulting from dissimilar metals making contact or from ground induced current corrosion of metal components in pipeline systems.
The HPS is an effective sealing system used in breaking electrical conductivity in piping systems with cathodic protection.
The HPS’s steel core and construction enables the gasket to withstand higher system pressure, pressure cycling, over torquing than conventional insulating gaskets.
Sealing raised face to Ring Joint flanges
The positioning of the sealing elements of the HPS gasket are designed to fit Raised Face, Flat Face and Ring Type Joint flanges. Because of this design we are able to replace the old design of Phenolic RTJ gaskets commonly designated Type “D-Ring Joint Gasket” which
were limited in their ability to take high stresses or excessive bolt loads which often resulted in gasket fracture, damage or failure in service with the ISOMAX HPS.
Because the HPS uses pressure-activated sealing elements which are designed to sit inside the ring groove on RTJ flanges it has the additional advantage of allowing the HPS to seal mismatched RTJ to raised face or flat faced flanges. This can be of great benefit to the customer when replacing flanges or valves using current stock inventory that may have a different flange face than the mating flanges in situ.
HPS Flange Insulation Kit Components
The gasket set comprises the following as listed below:
Insulation Kit Contents:
Insulating facing: | G-10 glass reinforced epoxy resin standard. G11 also available on request. |
Seal: | Spring energised PTFE (Viton also available) |
Core: | Stainless steel 316 |
Standard Thickness: | 7.0 mm. |
Insulating Washers: | G-10 glass reinforced epoxy resin (other materials are available) |
| 2 washers per bolt |
Steel Washers: | Zinc-plated steel, |
| 2 washers per bolt |
Insulating Sleeves: | G-10 glass reinforced epoxy resin. |
| (Mylar and Nomex also available) |
| 1 insulating sleeve per bolt |
Insulation Kit Properties
Material type: | G-10 Glass-reinforced epoxy resin | G-11 High temperature resin |
Compressive strength: | 50,000psi – minimum | 50,000psi – minimum |
Dielectric strength: | 24.1-31.5 kV/mm | 24.0 kV/mm |
Maximum temp: | 150°C | 200°C |
Water absorption: | 0.1% – maximum | 0.1% – maximum |
Flexural strength: | 65,000psi | 57,700psi |
Tensile strength: | 50,000psi | 41,000psi |
Temperature range: | – 130°C to 150°C | – 46°C to 200°C |
Seal: | Spring-energised PTFE (Viton rubber also available) |