A serrated, machined metal core insulating gasket faced with high-temperature THERMa-PUR™, sleeves, washers, metal backing washers and a Garlock 5500 spacer ring.
The VCXT™ high temperature flange insulation sets create a seal and maintain electrical isolation across a wide range of seating stresses and flange classes in elevated temperature service. They can be used in load compromised connections; such as damaged and/or lined flanges and also heavily bolted connections where significant gasket stresses may be generated.
The insulating gaskets and washers have been designed and developed for use in standard pipeline flanges where both cathodic protection and high integrity sealing are required at elevated service temperatures. For non-standard bolted connections please consult your regional GPT sales manager.
Features and Benefits
Fire safe in compliance with API 607 and API 6FB¹⁺²
THERMa-PUR™ is suitable for sealing across a wide range of chemicals (pH 0-14) and sweet and sour gaseous and liquid hydrocarbons ³
The standard 316L core and washer metallurgy are NACE (MRO175) compliant.
High compression characteristics achieve strong seal over wide range of flange surface finishes
Exceeds temperature capability of traditional vermiculite or glass/epoxy insulation sets – 770°F⁴
Better handling/shipping integrity than mica or vermiculite based products
Sizes available 1/2″ – 48″ NPS
Highest temperature rated isolating product available
Wide range of chemical resistance
Fire-safe flange insulation in conjunction with cathodic protection
Insulation between dissimilar metals to prevent galvanic corrosion
Wellhead isolation from inter-connected flow lines
Christmas Tree connections
Mating mismatched ring-joint to raised-face flanges (VCFS will seal in ring-joint, raised-face and flat face/slip-on flanges)
Prevents fluid trap corrosion between ring-joint (RTJ) flanges where high concentrations of CO2, H2S and other aggressive hydrocarbon media are present
Eliminate turbulence and flow-induced erosion between ring-joint (RTJ) flanges.
A better option for steam applications than GRE
Operational pressure range: Full vacuum to ASME B16.5 1500# API
Maximum Operating Temperature Range: -328°F to 770°F (-200°C to 410°C)
Note: Electrical values are based on laboratory conditioned samples in laboratory conditions. Exposure to moisture or elevated temperature will change values.