Special graphite gaskets SPETOGRAF® series GUS®600, GRAFMET®900
Working parameters
T service (°C)
P max (bar)
Q max (MPa)
-200 ÷ +650
420
500
500*
100*
200*
Applications:
SPETOGRAF® GUS®600 style and its versions are applied as gaskets of extremely high resistance to compression, blowout and vibrations with very good conformability; applied in both standard flange joints and vessel joints of engineered construction properties. Grafmet® 900 style is applied in high pressure valves and vessels to seal the covers, mainly in power engineering.
GRAFMET®960 is a die-formed ring from expanded graphite of 1,6 g/cm3 density and industrial or nuclear purity (GRAFMET® 960N), applied in valves and vessels as so called self –tightening sealing. The gap between the body and the cover, cover and the press ring, press ring and the body should not be bigger than 0,7mm for GRAFMET® 960; for bigger gaps and when contact stresses δ>100 N/mm2, GRAFMET® 962 is recommended. At present, GRAFMET® 960 is reinforced with stainless steel foil. GRAFMET® 962, also of trapezoid cross-section, is externally reinforced by metal caps which prevent the extrusion of graphite when the gaps exceed 0,7mm and high contact stresses over 100N/mm2 occur; additionally, the caps protect the graphite from erosion and oxidation; for big diametres and wide gaps, metal caps may be machined – GRAFMET® 962 M, such a sealing solution is most commonly applied in vessels to seal their covers. When the rings have rectangular cross section, their designations are accordingly GRAFMET® 970 and GRAFMET® 972 with machined caps.
SPETOGRAF® GUS®670 I gaskets are applied in very narrow flange faces in tongue and groove as well as in male and female flanges; properties similar to those of SPETOGRAF® GUS®660.
SPETOGRAF® GUS®666 and GUS®666 Z gaskets are designed with the groove of special geometry increasing the den-sity of the graphite sealing element; manufactured in standard sizes for flanges up to PN400, DN 400; gaskets of in-creased resistance to oxidation and blowout; features pre-determined working thickness under bolt load.
** - patent pending
SPETOGRAF® GUS®600 gaskets are recommended for extremely difficult applications, with very high loads both static and dynamic, as well as for old, damaged flange faces or where limited bolt stress is the case. These may be flanges adjacent to pumps, compressors, gate valves etc. self-compensating pipelines, floating heads, inspection holes; application of properly selected layers eliminates necessity of reconditioning of flange faces and ensures very good elastic recovery as well as compenastion of bolt relaxation; gasket is resistant to external loads, blowout and has constant axial dimension (important for machine construction); has very good tightness. Main applica-tions of SPETOGRAF® GUS®660 gaskets are large heat exchangers, vessels found in chemical industry sealing the floating head and vessel’s bottom, valves in petrochemical industry, refineries and power plants, pipelines in power engineering installations. SPETOGRAF® GUS®660 gaskets are individually selected for specific applications by SPETECH engineers
Custom styles:
- full face with bolt holes
- gaskets with bars and of shapes other than round
- SPETOGRAF® GUS®660 styles with graphite sealing element in the form of gaskets with metal eyelets, e.g. SPETOGRAF® GUS®660/32, GUS®660/42, etc.
- sensors, e.g. temperature, can be fitted in SPETOGRAF® GUS®660 i GUS®666
- GRAFMET® 900 styles of other cross sections, such as square, trapezoid of requested dimensions
Availabilty:
SPETOGRAF® GUS®666, GUS®666Z gaskets for flanges according to ISO 7005, ASME 16,5, ASME 16,47 and other
