The same advanced design of OK Couplings has been applied to the coupling bolt.
The Supergrip bolts represent a 'quantum leap' in improved technology for connecting
rotating flange couplings. They are on the job - on land and at sea - delivering
performance that supports the claim that they are better than any other coupling bolt available on the market.
Prior to Supergrip bolts, fitted bolts had to be 'slugged' into place with a sledgehammer.
This followed time-consuming honing of the holes and grinding of the bolts. Even with
improved technological methods for fitting bolts, it is hard to achieve an interference
fit. After each assembly and surface restoration, a small gap remains, increasing the
chance of misalignment and subsequent galling of standard studs. Eventually the bolts
have to be replaced. With a gap, the risk of coupling slippage at an overload situation
is increased, causing potential balancing problems.
The Supergrip bolt eliminates these problems. Supergrip bolts are a superior solution for
connecting flange couplings. Compared with traditional bolt systems, Supergrip bolts are
much easier to install and remove. The bolts are inserted and removed by hand and with a
clearance, eliminating the risk of seizure. The bolt is hydraulically expanded and tightened
into the coupling bolthole, using a set of portable tools. The need for an overhead crane and
time-consuming slugging of bolts is eliminated. Once the holes have been line-bored for initial
installation, there is no need for further reaming or boring of holes. Thus the use of
Supergrip bolts eliminates uncertainty about the length of downtime needed for removing
and installing bolts at outages. Costs are cut and the length of future outages is significantly decreased.
The oil-injection method used for removing the reusable bolts was pioneered by SKF. Originating
in Sweden, this technology is based on nearly a half century of experience in the engineering
and manufacture of couplings for the marine market, and since the late 1970s, for the utility industry also.
Publications (PDF) and videos
Supergrip bolt for rotating flanges,
Supergrip-Bolzen für drehende Flanschverbindungen
Supergrip bolts for steam and gas turbines
Shaft connections for Pelton turbines
Products for marine applications
Supergrip Alignment tools
Video, Fitting the Supergrip bolt
Video, Removing the Supergrip bolt
skf.coupling.systems@skf.com
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