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Hydraulic wrenches

Updated: 06.02.2023
Article author : Enex

Hydraulic wrenches (or hydraulic torque wrenches)


What is it?

First of all, it is a tool designed for tightening and unscrewing threaded connections with controlled torque.


What are the goals (advantages) of creating wrenches?

  • Increase the speed of repair work, assembly and disassembly of various products.

  • Improve the quality and accuracy of tightening threaded connections.

  • Ability to work with threaded connections in hard-to-reach places


Scope of application

Currently, due to the wide recognition of wrenches by specialists working in various industrial fields, their scope of application has significantly expanded: 

  • Steel industry

  • Shipbuilding

  • Production of construction works at power plants and railways;

  • Oil and gas industry

  • Chemical and rubber industry

  • Mechanical engineering


Types of wrenches

There are two main types of hydraulic wrenches, namely:

  • End (shown in Fig.1)

https://wren-russia.ru/upload/shop_1/0/9/6/group_96/small_group_96.png

Figure 1


  • Cassette (shown in Fig. 2) 

https://gpagregat.com/netcat_files/119/117/mxs_wrench_gpa_main.jpg

Figure 2


Specifics of the work

Hydraulic wrenches of the end type are usually used for dismantling works that require a lot of effort, for a corroded threaded connection. Cassette wrenches are more versatile and are mainly used when working in hard-to-reach places. 


Connection diagram

Consider an example of connecting a hydraulic wrench and the main elements of the connection:

Schematic connection of the GG series wrench to the oil station

  1. - Hydraulic oil station

  2. - Quick-release connection (BRS) – Dad

  3. -Quick-release connection (BRS) – Mom

  4. -High pressure hose (high pressure hose)

  5. -Hydraulic wrench

  6. -End head


How to choose a hydraulic wrench?

There is a table of recommended tightening force of bolts and nuts, which will help in choosing a torque wrench.

  • The table shows the maximum tightening torque of the bolt, the recommended torque is 80% of the one specified in the table.

  • The recommended tightening torque is equal to the one indicated in the table multiplied by (80-90%). For example, thread M48, degree of strength – 10.9; torque – 5592x90% = 5032.8 Nm.

  • The recommended torque for loosening the part is approximately 150% of the tightening torque. For example, the tightening torque is 5032.8 times 1.5 (2) = 7549.5 (10065.6) Nm.

Also due to the presence of restrictions on the distance, please pay attention to the location of the parts. Below are a number of examples:

https://wren-russia.ru/upload/shop_1/naprimer.png

In the above situations, it is not possible to use an end-type hydraulic wrench, use a cassette-type wrench.

Manufacturers from all over the world are still working on improving the design of hydraulic wrenches, offering the buyer a variety of their choice.





Sources used:





See hydraulic tools in the Enex online exhibition catalog: https://enex.market/catalog/Gidravlicheskiy_instrument/.
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