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Production • Processing • Handling


Leak-free high pressure piping systems


Esa Ranne looks at the benefits of non-welded connection technology to deliver leak-free piping systems


here are three major factors that must be managed in the planning and installation of leak-free systems. First, the right connection technique must be selected. Second, a single prefabricated tube has to be dimensioned accurately enough. Tird, the supporting of the pipes must be solid enough. When these three factors are realised, the piping will be tensionless and stable, and there will be no excessive strain on the joints. GS-Hydro utilises non- welded


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connection technology and has delivered leak-free piping systems around the world for


Fig. 1. GS-flange with 37° flaring: operating pressure is 50 to 420bar, the outside Ø 16 to 273mm and the wall thickness <2.5 to 7mm.


more than 30 years. 3D technology provides a design according to provided diagrams and layouts. Strain, such as thermal movements, directed on fittings, clamps and piping, can be estimated beforehand.


Choosing the connection GS-Hydro is the original provider of non-welded piping connections. GS-flange connecting system covers tubes with an outside diameter of 16 to 609mm, the highest allowed operating pressure being 690 bar. Te standard production materials are carbon steel (zinc electroplated or hot dip galvanised) and stainless steel. When the wall thickness of the high pressure pipe is less than 7mm, the flange is locked to the pipe by 37° flaring. When the wall thickness exceeds 8.5mm, the flange is anchored with a retain ring. Te non-welded GS Retain Ring technique enables tubes with a diameter of 350mm and a 350 bar nominal pressure. When the pressure is less than 40 bar, GS-Hydro applies the 90° flaring technique. Te wall thickness can then be a maximum of 11mm and the tube diameter a maximum of 609mm. Te benefits of the GS-flange connection can also


be seen with smaller size tubes. One benefit of the GS-flange with an outside diameter of 20 to 50mm compared to a fitting connection (eg, DIN, JIC) is their smaller size and, above all, lower tightening torque, which keeps the installation space reasonable. GS-Hydro delivers prefabricated tube modules to the site which are then joined together to make a complete piping system. Tis is done by, for example, cold forming or machining instead of welding. Terefore, there will be no tension focusing on the material and decreasing the dimensional accuracy. Cleaning the insides of the tubes is easy, and there


are major time savings as the installation time for a high-pressure connection can be made, on average, in a couple of minutes with GS-Hydro technique. Additionally, the prefabricated pipes with bending, coatings, stampings, fittings, etc. can be fabricated in advance in workshops with te ideal machinery and by professional personnel. Together, this means that the cost savings are significant compared to welded piping fabricated at the installation site. ●


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Fig. 2. The lower tightening torque and smaller size of GS-flange technique guarantees an easy installation even in tight circumstances.


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Esa Ranne is with GS-Hydro Oy, Espoo, Finland. www.gshydro.com


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