Which tool is «best»? The simple and short answer is, it depends on where you intend to use the tool. In this article, we’ll take a look at some of the key areas and compare both types.
Experienced bolt pullers are aware of the differences, advantages, and disadvantages of pneumatic torque tools and hydraulic torque tools. If you are new to bolt pretensioning, it is not always easy to know which type to choose the next time you invest in a new torque tool. No matter how much experience you have, it is important to think carefully and take the time to ensure that you understand the key differences between the tools.
AREA
Pneumatic torque tools require access to air. If you plan to work inside a factory where you don't have access to air, pneumatic torque tools are a very poor option. If you have applications where you will be working on pipelines outdoors, a hydraulic torque tool is the right choice.
TORQUE
Hydraulic torque tools definitely come out on top when it comes to applications that require high torque. When comparing torque tools of the same size, a hydraulic torque wrench can be 6 times more powerful than its equivalent pneumatic model. The maximum torque of a large hydraulic torque wrench can be as high as 47,453 Nm.
SPEED
For high-volume applications, fast tools are essential to keep things moving. It is in this type of work that a pneumatic puller outperforms a hydraulic puller. This is why pneumatics are preferred when working in automotive manufacturing. These pullers offer continuous rotation and have a low-friction gearbox that minimizes wear and extends tool life.
USER-FRIENDLY
Pneumatic pullers are less complex than hydraulic pullers. Operators find them much easier to use. They only require an air connection, eliminating the need for a hydraulic pump, special oil, and additional accessories. They can be used by one operator, unlike hydraulic torque tools where you have to work with an additional technician to handle the controls on the hydraulic pump or attachment.
SAFETY – PNEUMATIC VS HYDRAULIC TORQUE TOOLS
Using both tools can expose operators to a pinch hazard. Aside from this, there are also a few other pros and cons to weigh when stuck between pneumatic or hydraulic tools.
HYDRAULIC TORQUE TOOL
– Crushing risk
– Handles are not always included
– Snakes increase tripping hazards
– Hydraulic pumps are often heavy and difficult to move
– Many hydraulic pumps rely on electricity to power the pump – this is a risk when working near flammable liquids and gases
– Risk of slipping due to hydraulic fluid
PNEUMATIC TORQUE TOOL
– Crushing risk
– Air leaks can cause very serious injuries
– Pneumatic tools create higher noise levels
– Poor handling of air hoses can create tripping hazards
ACCURACY
On average, a pneumatic puller provides an accuracy of +/- 5%. This is usually accurate enough for those working in assembly work. Hydraulic torque tools provide even greater accuracy – typically +/- 3%.
COST
As long as you have access to an air connection, pneumatic torque tools are an economical choice. You don't need a separate pump – you just connect the puller to the air connection and you're good to go.
CONCLUSION
Both hydraulic and pneumatic pullers are good choices when used correctly. The most important things to consider are torque requirements, the area where the tool will be used, and whether it is a high volume application.
If you plan to work at a power plant, pipeline, or refinery, a hydraulic puller is the best choice. If you work in a factory environment where a puller that handles high volume is needed, a pneumatic tool is the best choice.
