April 2003

Special Report: Maintenance/Reliability

Consider multi-jackbolt tensioners

Benefits include improved safety and reduced cost and installation time

Steinbock, A., Superbolt, Inc.

Since the 1980s, multi-jackbolt tensioners (MJTs) have found widespread use on turbines, pumps, heat exchangers, piping, valves, reactor vessels and compressors. Their reliability in service, ease of application (versus other means) and relative low cost account for an increasing popularity. At first glance, MJTs may not always seem the cheaper alternative. On both new equipment and retrofits where cost of materials takes priority, these hexnut replacements typically cost more than standard nuts and bolts - up to a point. As size increases, the difference tends to diminish. In size ranges beginning with 1-in. and

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