What is hydraulic bolt tensioning?
Ultra High-Pressure Hydraulics. Bolt tensioning is a method of controlled tightening which applies load to a bolt by stretching it axially. Mechanical efforts to create torque are replaced with hydraulic ultra-high pressure.
How does hydraulic bolt tensioning work?
Bolt tensioning works by preloading the bolt, stretching it before the nut is tightened. The tensioner is clamped to the bolt’s threads and pushes against the flange in the surface being bolted. This provides a very consistent amount of stretch to the bolt, ensuring consistent bolt stretch and clamping force.
How do you use a hydraulic tensioner?
How to Use a Hydraulic Bolt Tensioner
- Place the bolt tensioner over the free section of the stud bolt until it comes into contact with the flange.
- Thread the tensioner’s puller down onto each load cell so it is connected to the cylinder piston.
- Each tensioner is connected together with the hydraulic hoses.
How do you put tension studs in?
Tensioning operation
- Step 1: The bolt tensioner is fitted over the stud.
- Step 2: Hydraulic pressure is applied to the tensioner which then stretches the stud.
- Step 3: The stud’s nut is wound down against the joint face.
- Step 4: Pressure is released and the tool removed.
Why bolt tensioning is required?
The objective of tensioning is to stretch the bolt, or stud, to a predetermined load, by using force to elongate the shank. Very little turning force is required. It is necessary to have some extra thread above the nut, which is used to attach the pulling cylinder, which is removed after completion.
Why is bolt torquing needed?
Torque is used to create tension. Bolts are used to affix two components so that they can resist tensile (pulling apart) and shearing (sliding apart) forces. After the nut has been turned onto the bolt, additional torque causes the nut to turn and stretch the bolt.
What does torquing a bolt mean?
What is Bolt Torquing? Torquing is the most commonly used way to achieve fastener preload with bolted joints. Torquing produces this load through rotational force on a nut or bolt head. This torque is usually measured in foot-pounds (ft-lbs.) or Newton-meters (Nm).
What kind of bolt tensioner does boltight use?
Bespoke Bolt Tensioners Secure Deep-Water Pipelines Boltight supplies tailormade bolt tensioning equipment for structural split repair clamps to Subsea Innovation in the UK. Read More
Which is the correct way to turn a pulley on a tensioner?
The repair manual will illustrate which way the specific tensioner needs to move to release the tension. As stated in Step 2, tensioners that use the pulley bolt most often turn clockwise since the bolt itself will unscrew from the pulley if turned counterclockwise.
Which is TenTec hydraulic bolt tensioner for Anges?
SUBSEA HYDRAULIC BOLT TENSIONER TENTEC COMPACT 8The COMPACT-8 range of subsea bolt tensioning tools brings a new generation of bolting solutions. Comprising just 8 bolt tensioning tools, the COMPACT-8 series is capable of tensioning most standard anges and Compact anges.
How big is a CTST topide bolt tensioner?
The CTST range of topside bolt tensioning tools comprises 6 base tools covering bolt sizes from 3/4” to 4” (M20 to M100). The tools are designed to t on to most ANSI B16.5, ANSI B16.47 Series 1, MSS- SP44, API-6A and API-17D anges. Each base tool can be converted for use with different bolt sizes using a conversion kit.
What should the tension be on a Grade 5 bolt?
The table in this article shows that by using this formula a 1/2-13 Grade 5 plain bolt should be tightened to 82 foot pounds, but the same bolt that is waxed only requires 41 foot pounds to tighten the same tension. A perfect 1/2-13 Grade 5 waxed bolt will break if it is tightened to 81 foot pounds because the K factor is drastically lower.
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What causes the tension of a tightening bolt?
A properly tightened bolt is one that is stretched such that it acts like a very ridged spring pulling mating surfaces together. The rotation of a bolt (torque) at some point causes it to stretch (tension). Several factors affect how much tension occurs when a given amount of tightening torque is applied.
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