Bolt tension tools
Sometimes, demands are great
Precise and controlled bolt tensioning is one of the important considerations in modern construction due to concern for personal and operational safety. Hydraulic bolt tensioner was first used by ships’ engine builders. Today, the technique is commonly used in reactor boilers, pressure tanks, heat exchangers, cranes, machine foundations, diesel motors, turbines, compressors, and oil/gas pipelines.
Sometimes, there isn’t much space
Many places requiring bolt tensioning are hard to reach with standard tools on the market. We specialize in tailor‐made tools which are small and suitable to be used in areas where standard tools are too large to reach. As such, our clients are able to pre‐tension at areas previously not possible to reach.
Economy and safety
Hydraulic bolt tensioning is not expensive to use compared with alternative “old‐fashioned” tools that require extra manpower. Even the most careful tightening is not exact enough with conventional tools. Correct pre-tension of bolts reduces the risk of leakage and shutdowns. Safety for the workers and the environment is important to us. No one can afford an accident.
We have standardized many tools
Early, we discovered that we had to standardize our “special bolt tensioners” and base them on a flexible system. Therefore, our customers are free to determine thread dimensions, height, distance between the bolts, and other technical specifications. Our tools can fit any thread dimension. Behind our bolt tensioners are many years of experience and development. Material quality, tolerance and the right seals are important factors when using high pressure. We can be your one‐stop supplier by delivering bolt tensioners, pumps, hoses, bolts and nuts, offshore operators, training and expertise.
Make-up tools
Our design is dependent on our customers’ requirements and the amount of space available for pre‐tensioning. We have tools that are specially designed for weld necks and other standard flanges. We try to combine a variety of thread dimensions in our bolt tensioning tools.
If many bolts in a fixed OCO have to be tensioned, we can design a make‐up tool where all bolts are tensioned in one operation.
We also produce bolts, nuts and washers
We design and manufacture bolts and nuts for the shipbuilding, processing and offshore industry. We can produce studbolts with rolling threads, from 8.8 – 12.9, delivered with 3.1 b.c certificate and DNV‐approved. Nuts and washers can be delivered in a range of sizes and according to current norms.
Others
Hydraulic nuts and rings
In some applications, there is a need for a permanent hydraulic tension tool to be operated immediately, for example, for controlling the force on the operating conditions in the control system. We have good experience in hydraulic nuts or rings, which act as both permanent nuts and bolts tensioners.
In other applications, fixed jigs with a number of bolt tensioners are preferred in order to achieve rapid and rational tensioning of the bolts, for example, in vessels’ diesel engines and in processing plants. Bandak Tools’ hydraulic nuts, rings and jigs are designed according to customers’ specifications.
Torque wrenches
There are some applications where bolt tensioners are not suitable due to bolts’ length. In this instance, a hydraulic wrench can be the solution.
Instead of making changes to standard wrenches, we provide customized solutions when other wrenches are unusable. Examples of where our hydraulic wrenches are used on flanges on ships, cranes, valves, and major press machines for scrap. With a working pressure of 600‐1,000 bar, our tools are lightweight, powerful and economical.
Manufacturing experience since 1966
- We have ready-designed tools for bolt sizes from M14 to M140.
- Tools, pumps, hoses and offshore personnel available for rent.
For consultation, please contact:
Håvard Øygarden
Senior Account Manager
Phone: (+47) 977 35 152
E-mail: havard.oygarden@bandak.no