Reciprocating Compressor - Crosshead Jamnut

Problem: Crosshead Jamnuts are well known for the difficult and unsafe methods used to attempt to tightening them. Common methods include using sledgehammers, overhead cranes and even floor jacks. As an example, one petrochemical company employee had his jaw broken and facial damage when the wrench he had hit with a sledgehammer slipped and hit him. Other common occurrences include hand, arm, and back injuries.

The large sizes of piston rods make it especially difficult to obtain proper tightness. Since tightening the nut requires going through an inspection door there is little room to maneuver.

Solution: Supernut® Tensioners make the installation of piston rods easy. Thousands of crosshead jamnuts have been used in the field. The torque on the individual jackbolts is applied with only a hand held torque wrench to achieve a high preload. This eliminates the dangerous and inaccurate bolting methods commonly used.

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  Old Method.