Embodiments disclosed herein generally relate to a system and method for tensioning a bolt. The bolt tensioning system may be used with variable length connection members, for example studs, in any one or more of the drilling, subsea, and process industries to couple a first member to a second member. The bolt tensioning system may remain coupled to the first member and the second member, while applying tension to all of the bolts at the same time, rather than having to torque or tension each bolt individually. The bolt system may accurately and uniformly tension all bolts in a single operation to provide reliable connections.

The invention concerns a rod tensioning device having a first actuator, at least a second actuator and a tubular support sleeve dedicated to radially surround a threaded rod. Each of the actuators provides a cylinder, and a piston sliding in the cylinder and forming with the cylinder an annular chamber dedicated to be supplied with pressurized fluid. According to the invention, the at least second actuator is temporary axially arranged between the first actuator and the tubular support sleeve for a temporary blockwise assembly, the pistons of two axially adjacent actuators being indexed in rotation together.

A tensioning device for a thread end portion of a bolt has a cylindrical housing and a piston, moveable in longitudinal direction therein and connectable to a hydraulic supply. An interchangeable sleeve extends centrally through the piston. At its end it has an internal thread with engagement length to be screwed onto the thread end portion. The sleeve has a radially expanded portion carried axially by a carrier face of the piston. In order to prevent the sleeve from prematurely contacting the threaded bolt when mounting the bolt tensioning cylinder and prevent damage to the threads, the sleeve is moveable longitudinally relative to the piston. The longitudinal sleeve travel is defined by the carrier face as first longitudinal stop and by a second longitudinal stop. The longitudinal sleeve travel is at least equal to, preferably greater, than the engagement length of the internal thread of the sleeve.

The subject of the invention is an assembly and clamping bolt to be employed under tension, having a shank and a head, wherein the head, situated at a first end of the shank, is provided with a clamping tensioning means with a hydraulic cylinder mounted permanently on the bolt, clamping taking place between a rear shoulder device and the hydraulic cylinder, the rear shoulder device being disposed at a second end of the shank.

The present invention relates to a multi jackbolt tensioner and methods of using the same. The present invention alleviates some of the problems associated with presently available multi jackbolt tensioners.

In a method for the documented tightening or tightening up of a heavily loaded screw connection of a threaded bolt and a nut screwed on the threaded bolt by using an axially operating tensioning device and a process control unit provided with a documentation module, the screw connection is identified by scanning an identification provided on the screw connection and data determined by scanning the identification is stored in the documentation module. The screw connection is lengthened by the tensioning device by axially pulling on a threaded end of the threaded bolt and a tightening force (F.sub.A) and/or a tightening pressure (P.sub.A) exerted by axially pulling on the threaded end is stored in the documentation module. After lengthening, the nut is turned by using a hand torque wrench and an actually exerted hand torque applied for turning the nut is stored in the documentation module.

Robot (1) to move a support platform (6) along a series of nuts (2) pre-screwed on bolts (3) arranged in a linear or in particular curved flange connection (4). The bolts (3) project from the nuts (2) pre-screwed in substantially a nut plane (13) by a projection length (15). The robot (1) comprises a drive to move the robot (1) along the curved flange connection (4). The drive comprises at least one drive element (12) and holding means (11) both connected to the support platform (6), wherein the holding means (11) comprise at least one pair of guiding rails (16, 17) connected to the support platform (6) in a distance from each other of more than the diameter (D) of the bolts (3) and less than the width across flat (AF) of the nuts (2) and projecting more than the projection length (15) from the support platform (6).

Robot (1) to tighten a series of nuts (2) pre-screwed on bolts (3) arranged in a linear or in particular curved flange connection (4), which bolts (3) project from the nuts (2) pre-screwed in substantially a nut plane (13) by a projection length (15), which robot (1) comprises a drive to move the robot (1) along the curved flange connection (4) and a tool (10) to tighten the nuts (2) with a predefined torque both connected to a support platform (6), wherein the tool (10) is built to screw a tension nut (26) onto the bolt (3) to elongate the bolt (3) and to tighten the pre-screwed nut (2) with a predefined torque with a tightening wheel (35), which robot (1) comprises positioning means to substantially align the axis (28) of the tension nut (26) with the axis (14) of the bolt (3) to screw the tension nut (26) onto the bolt (3).

A hydraulic tensioning apparatus for tensioning a threaded member (2) having a thread, comprising: a hydraulic tensioner (1), having a body (4) and a pressure space (13) for hydraulic fluid and having a thread engaging member (7) arranged to engage the thread of the threaded member (2) and to be urged away from the body (4) on introduction of hydraulic fluid into the pressure space (13) so as to tension the threaded member (2); a displacement sensor (11, 12) arranged to measure a linear displacement of the thread engaging member (7) relative to the base (4) and to provide an output indicative of the linear displacement; a rotation sensor (65, 66) arranged to determine a rotation of a nut (3) rotating on the threaded member (2) and arranged to produce output indicative of a rotation angle of the nut (3); and a control unit (80) arranged to take as inputs the outputs of the displacement sensor (11, 12) and the rotation sensor (65, 66), and to determine from the output of the displacement sensor (11, 12) a required angle of rotation of the nut (3) which accommodates for extension of the threaded member (2) due to being tensioned by the hydraulic tensioner (1).

Various embodiments include an apparatus for servicing a turbomachine, along with a related servicing method. In some cases, the apparatus includes: a system for servicing a turbomachine casing having adjacent segments joined with a set of threaded fasteners, the system including: a threaded fastener tensioning device sized to fit over ends of a threaded fastener in the set of threaded fasteners, the threaded fastener tensioning device including: a retention component for retaining a first end of the threaded fastener; and a tensioner for tensioning or de-tensioning a second end of the threaded fastener; and a mounting system coupled with the threaded fastener tensioning device, the mounting system for retaining the threaded fastener tensioning device proximate the adjacent segments of the turbomachine casing.