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The PGEā¢ was designed to give operators an alternative to the failure prone phenolic-based isolating gaskets. The unique design of the PGEā¢ system incorporates patented overlapping and offsetting seal grooves. The purpose of this design is to break each layer of laminate within the gasket itself, thereby creating a barrier through which fluid and/or gas cannot migrate. The sealing element can be any elastomeric material, as well as more sophisticated spring-energized PTFE lip seals. As a result of this advanced seal design, maintenance-free flange isolation and flange face corrosion mitigation are achieved economically. Depending upon the sealing element selected, the PGEā¢ is rated for most hydrocarbon and water service applications.
This gasket is suitable for use in raised-face and flat-face flanges in ANSI Class 150, 300 and 600 serviceĀ¹ (or equivalent). In addition to providing electrical isolation, the gasket is excellent for isolating flanges made of dissimilar metals or where prevention of flange face corrosion is desired.
G-10 NEMA grade G-10 Glass-Reinforced Epoxy (GRE) laminate
G-11 NEMA grade G-11 Glass-Reinforced Epoxy (GRE) High Temp. laminate material
SEAL RETAINERĀ The PGEā¢ seal retainer is constructed from NEMA grade G-10 glass-reinforced epoxy (GRE). This material has excellent performance characteristics with very high compressive strength, high flexural strength, high dielectric strength and low fluid absorption. PGEā¢ seals made from grade G-10 material are rated for service up to 302Ā° F (150Ā° C). For higher temperature service, grade G-11 is an acceptable alternative material, which is rated for 392Ā° F (200Ā° C) continuous service. Two overlapping and offsetting seal grooves are machined into the high strength retainer in order to break the potential leak/weep path that is inherent in all glass laminate materials.
SEALING ELEMENTSĀ The composite retainer backing material behind the seal remains uncontaminated and thus permanently holds the seal in place in a static, fully-encapsulated manner. GPT offers three standard sealing elements for use with the PGEā¢. For custom applications, other sealing elements such as Kalrez or EPDM may be specified. The three standard seals are:
PTFE (spring-energized)Ā Recommended for all environments. Helical wound spring provides radial load. Encapsulation in the seal grooveĀ reduces creep or cold flow. This sealing system truly distinguishes PikotekĀ®Ā systems from all other flange sealing systems.
VitonĀ General purpose oilfield elastomer. Excellent resistance to aliphatic hydrocarbons and glycols. Good resistance to aromatic hydrocarbons.
Not recommended for: Systems with amine inhibitors and in piping systems containing significant partial pressures of H2S, polar gases (i.e. CO2) or where radical pressure drops commonly occur.
NitrileĀ General purpose elastomer. Excellent for use in water systems or with some aliphatic hydrocarbons, silicone base fluids and glycol based systems.
Not recommended for: Systems containing H2S, aromatic hydrocarbons, phosphate esters or halogenated hydrocarbons; piping systems subjected to radical pressure drops or piping systems containing significant partial pressures of polar gases (i.e. CO2).
In order to electrically isolate the two flange faces, isolating sleeves and washers are required.GRE washers are recommended for use with the PGE gasket and have a compressive strength of 66,000 psi. Two metal washers are also provided for each sleeve.
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