Cartridge seal designed for big and standard bore pumps
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 115 KB
- Volume
- 1995
- Category
- Article
- ISSN
- 1350-4789
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✦ Synopsis
Two exfoliated graphite packings have been developed by James Walker to reduce fugitive emissions and energy loss from valves and high-speed rotary pumps.
Called Supagraf Ribbonpak and RibbonPak M, these products are designed for low-friction sealing of pump shafts and valve stems operating in harsh environments in power stations, boiler houses, refineries, petrochemical plants, steelworks and paper mills.
Both types can be used for on-site maintenance and equipment refurbishment as well as OEM installation. They come in four-metre lengths of 3 to 25 mm square section, which are cut to length to form packing rings for immediate use in a gland.
A feature of RibbonPak M is its construction from graphite foil reinforced with fine Inconel wires. This gives extra strength and resistance to pressure and extrusion, which enables it to be used on valves operating at up to 210 bar. Standard Supagraf RibbonPak contains no wires and is therefore suitable for rotary pumps running at shaft speeds up to 25 m/s. This is reduced to 22 m/s when handling highly abrasive media such as paper pulp.
The graphite foil is chemically inert from pH O-14, except for strong oxidlsing agents. It maintains its sealing at temperatures as low as -200 °C, and up to +600 °C in steam and non-oxidising media. Maximum temperature in an oxidlsing environment is +450 °C.
A particular benefit to the process Industries is that Supagraf has negligible volatiles content and low extractable trace impurities such as chloride and sulphate.