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RHI Magnesita INTERSTOP AG
Gas Purging and Sealing

INTERSTOP
Global leader in
Flow Control Technology

Adress: Bösch 83A
Location: 6331 Hünenberg
Phone: 041 785 75 00


 

Our innovations at a glance

Maximize your metallurgical results with our inert gas purging systems!

Increased product requirements in terms of clean steel, very low carbon steel grades and clean copper require optimized process operation with bottom purging systems in converters, furnaces and ladles such as at EAF, BOF, LF and VD.

INTERSTOP® offers gas control boxes for inert gas purging systems to propel your metallurgical results to a next level. The result of our innovative gas control box concept is an improved distribution of temperature as well as alloying elements in the melt. Especially the number, type, arrangement and quality of plugs, flow patterns as well as purging gases and their control exert a remarkable influence on the metallurgical process of our customers.


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Your benefits at a glance

  • INTERSTOP® and RHI Magnesita`s holistic system approach combines metallurgical know-how, gas control systems and refractory purging products
  • State of the art system components to drive the process as close as possible to the metallurgical needs
  • Extensive know how available for steel- and non-ferrous purging and shielding applications
  • Latest IT solutions capable of complex operations to provide a high-level operator interface
  • Maintenance friendly design for highest reliability

INTERSTOP slide gate flow control

 

  • INTERSTOP® and RHI Magnesita`s holistic system approach combines metallurgical know-how, gas control systems and refractory purging products
  • State of the art system components to drive the process as close as possible to the metallurgical needs
  • Extensive know how available for steel- and non-ferrous purging and shielding applications
  • Latest IT solutions capable of complex operations to provide a high-level operator interface
  • Maintenance friendly design for highest reliability

INTERSTOP slide gate flow control

 


DPP gas purging system for EAF by INTERSTOP®

The heart of the Direct Purging Plug system (DPP) is the gas control box, in which argon and nitrogen are precisely controlled. Special features of our mass flow controllers are the high precision of +/- 1.5% of the flow rate and the short setting time of less than 500 milliseconds.

In addition to the gas control unit, the DPP system includes the integration of process control, RHI Magnesita`s Direct Purging Plugs, a user-friendly HMI interaction and process visualization.


CLP gas purging system for Ladle by INTERSTOP®

In addition to the same advantages given with the EAF system, additional features of the Controlled Ladle Purging system (CLP) concern the following supporting systems:

  • the SOC-H system, which is a combination of a mechanical closure system with the gas purging plug providing maximum safety against breakout.
  • the PFD plug function device for checking the purging plug on the preparation surface to ensure the release only of ladles with a properly functioning purging plug from the preparation surface.


Benefits of gas control box

  • Wide regulation ratio 1 ÷ 50 of the mass flow controller (e.g. from 24 Nl/min to 1’200 Nl/min)
  • Fast step response of the MFC (5% – 95% in less than 1 second)
  • High accuracy of the MFC ±1.5% o.R. ±0.3% F.S. (o.R.: of reading; F.S.: of full scale)
  • O-ring sealed components, maintenance friendly
  • No instrument air required
  • Low maintenance costs
 
 

INTERSTOP slide gate flow control

 

Benefits of gas control box

  • Wide regulation ratio 1 ÷ 50 of the mass flow controller (e.g. from 24 Nl/min to 1’200 Nl/min)
  • Fast step response of the MFC (5% – 95% in less than 1 second)
  • High accuracy of the MFC ±1.5% o.R. ±0.3% F.S. (o.R.: of reading; F.S.: of full scale)
  • O-ring sealed components, maintenance friendly
  • No instrument air required
  • Low maintenance costs

Benefits of bottom purging system

  • Minimization of the tap-to-tap time 
  • Less alloy elements required (cost saving)
  • Less deoxidation agents (e.g. A1) required
  • Shorter and quicker reaction pathways between the slag and steel bath
  • Improved process control (higher accuracy of the tapping temperature and element levels)
 

Benefits of bottom purging system

  • Minimization of the tap-to-tap time 
  • Less alloy elements required (cost saving)
  • Less deoxidation agents (e.g. A1) required
  • Shorter and quicker reaction pathways between the slag and steel bath
  • Improved process control (higher accuracy of the tapping temperature and element levels)
 
 

INTERSTOP slide gate flow control

 

Gas sealing systems by INTERSTOP®

Steel flow regulation between ladle to tundish and tundish to mould can either be done by slide gate or by stopper control. For both, use of argon can be required depending on the steel grade and the flow control facility. Very little argon flow rate into the stopper and/or nozzle helps to reduce clogging. Additional inert gas shielding around refractory joints exclude any air ingress into the casting channel.

It is apparent, that in this sensitive area close to the end of the phase where steel is still liquid, a very accurate system for the argon control is needed. At this application, very little changes in argon flow will have big consequences: a too small flow will support nozzle clogging, a too high flow will negatively influence the conditions in the mould by introducing too much bubbles.

For this reason INTERSTOP® offers very sensitive flow controlled and/or back pressure controlled systems. If you have further questions about our gas sealing systems, please contact us via the “Contact” button below.


Get more information

If you have any questions regarding our Gas and Sealing
Technology, please do not hesitate to contact us. An expert
will contact you in the shortest possible time.