Dive in with the DEPRAG air motor!
Stirring and mixing underwater
”Anything is possible” is the motto of the DEPRAG engineers. They do not rush their client consultations. If there is no suitable air motor for the planned application in their catalogue then they explore individual drive solutions. The air motors have a wide spectrum of use due to their diverse application possibilities, simple design, low performance weight, broad speed range and explosion safety. DEPRAG air motors are used in almost every field of industry – even underwater.
The ADVANCED LINE air motor series combines many advantages with their high quality stainless steel drives. Due to the robust design of the external parts in non-corrosive stainless steel and the sealing with two radial shaft sealing rings, these vane motors in the power range 120 W to 1.2 kW are predestined for use underwater.
For underwater applications it is vital to consider how the motor will be deployed and at what water depth it will be operated. If the air motor has to start underwater it can be used up to a depth of 5 metres only. Whereas if it is started on the surface it can be immersed up to a depth of 20 metres.
If there are additional requirements to tackle or if the air motor is needed for use in salt water then further modifications must be made to the housing material and to the sealing, and the internal parts should be coated to prevent corrosion.
In order to select the most suitable air motor for the customer’s application, intensive advance discussions must take place with the client in order to gain as much insight as possible into the application. This example gives a more detailed description of what the DEPRAG engineers can realise for a customer: A motor was needed for use in an acidic solution as a mixing drive for circulating the fluid and evenly stirring in minerals. In order for a motor to be designed which would withstand its surrounding conditions, the following questions needed to be answered: Which acid was being used? What concentration of acid is in the fluid or is derived from the fluid: what kind of stainless steel material is stipulated?
The application is the decisive factor! In this case they selected a stainless steel motor from the ADVANCED LINE series with a special requirement to be insensitive to acid. Additionally, a housing was designed which was made from suitable acid-resistant material and with a special sealing to prevent infiltration of any liquid. In order for the air motor to provide the required torque for the application, further consideration of the operating conditions had to be made, such as the available operating pressure, required hose length etc. The technical data of DEPRAG air motors is based on an operating pressure of 6 bar. If the available pressure is lower than this, the torque is reduced proportionally. When using hose lengths longer than 3 metres the hose cross-section opening should be increased correspondingly.
More information: DEPRAG SCHULZ GMBH u. CO.
