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Multi-Stud Tensioning System

The Segmented Multi Stud Tensioning System (MSTS) is a portable system designed to simultaneously tension all studs on system closures such as steam generator primary and secondary manways, handwheel and valve covers. This state-of-the-art system applies a predictable and accurate preload to all studs simultaneously, thus eliminating the problems normally associated with conventional torque tightening techniques, for example: uneven gasket preloads resulting in closure leakage, galling, broken fasteners, etc.

The MSTS enables the installation and removal of system closures to be completed rapidly in high radiation areas. Therefore, its application is also consistent with meeting ALARA objectives.


The Principle...
Hydraulic pressure is applied simultaneously to each segmented stud tensioner. All frictional factors connected with conventional bolt tightening methods are alleviated since MSTS apply a direct axial force to the bolts which generates a bolt elongation. This elongation/tension is permanently retained by means of the applications hexagon nuts. MSTS have been designed to be as compact as possible, in order to allow adjacent fitment on as many applications as possible.

Product Features
Profile cut body to reduce weight
Elliptical shaped piston/rams (if necessary)
Rare earth magnets embedded in Nut Rotating Sockets, for ease of assembly
Single hydraulic inlet connection per segment
Can be designed with variable bolt chambers per segment to optimize weight
Extremely reliable machine cut polyurethane seals


Tentec Mult-Stud Tensioning Systems are built and designed on request.Contact Tentec with application details for a no obligation design and quote.You will find more information about this product in the downloads section (right)

Ancilliary Equipment
Useful Links

 Air Driven Power Pumps
  Electrical Driven Power Pumps
 High pressure Flexible Hose


Additional Features
Portable hydraulic tensioning systems designed to tension all studs simultaneously on various closuresl
Applies predictable pre load to studs eliminating problems associated with torque tightening techniquesl
Meets ALARA objectives by minimizing time spent in high radiation area’s to remove/install closuresl
Lightweight segments manufactured primarily from ARMOLOY- coated high strength steel to provide superior corrosion protection and long lifel
Highly reliable hydraulic piston seals can be replaced easilyl
Pistons have over stroke indicators, high pressure release devicel
Diverts high pressure fluid away from the operator if the piston stroke is exceededl
Sleeved hydraulic hoses protect the operator in the event of hose failurel
Lightweight, portable air operated hydraulic control units are available