Quick coupling pipe
Quick coupling pipes (SK pipes) are pipes and pipe elements with coupling parts that enable a secure connection with similar pipes in a short time with simple movements and can be separated again just as quickly. Colloquially, the pipes are known as Lanninger pipes after the author Karl Ludwig Lanninger and are mainly used in agriculture for pumping water during irrigation.
properties
The pipes are made of hot-dip galvanized steel or aluminum , are usually 6 meters long and are manufactured with an inner diameter of up to 300 mm. At the end there is a cardan coupling (which is also called a Perrot coupling) in the form of a male and a female piece . In the female part of the coupling there is a rubber O-ring to seal the connection. Since the couplings are not hermaphrodite, the alignment of the pipes and accessories must be observed when laying, or short adapter pieces with two male coupling sides must be installed if necessary. The couplings allow two connected elements to be angled by at least 6 ° in each direction. This enables uneven floors to be leveled out or curves with a large radius to be built. To close and open the clutch, a lever extension for the clutch handles in the form of a metal tube is usually used. Individual pipes can be replaced from a pipeline that has already been laid without the entire pipeline having to be moved lengthways.
The system includes various accessories such as bends, T-pieces , gate valves , transition pieces to Storz couplings and distributors .
commitment
In Germany , aid organizations such as the fire brigade or the technical relief organization use pipes with an internal diameter of 105 mm to transport water over long distances . Due to the significantly lower flow losses compared to hose lines (0.26 bar with an aluminum pipe compared to 1.12 bar with a B-hose at 800 l / min flow rate and 100 m length), the use of quick-release pipes is particularly worthwhile here. In the case of major damage events such as extensive forest fires , the longer lead time for the construction of a long pipeline (over several kilometers) is of little consequence, since the fire fighting can take several days and large amounts of water are required that cannot be taken from the public hydrant network, but must be brought about from a surface water . In this way, an intermediate storage unit can be filled that is closer to the source of the fire and the fire trucks then drive to shuttle traffic.
A disadvantage is the high expenditure on storage and transport capacities for the pipes, so that only a few fire departments have such a system. The local branch Neuruppin of the THW holds z. B. Pipelines for approx. 8 km of piping and accessories in stock and has sometimes even permanently loaded them on trailers in order to be quickly ready for use. By building flyovers with the use of scaffolding system (EGS) and paths can be crossed without obstructing traffic.
literature
- Günter Wossog (Ed.): Handbook of pipeline construction. 2nd edition, Vulkan Verlag, Essen 2003, ISBN 3-8027-2723-1 .
- Franz Schwedler, Helmut von Jürgensonn: Handbook of the pipelines. Second edition, Springer Verlag, Berlin / Heidelberg 1939.
Individual evidence
- ↑ Holger de Vries, Andreas Weich, Wolfgang Freynik and Arvid Graeger: Water pumping over long distances - tactics and technology . ISBN 978-3609686646 , 2005, pp. 181f.
Web links
- Standardization in the field of irrigation (accessed on May 5, 2017)
Remarks
- ↑ In technology, plug or coupling systems are referred to as hermaphrodite or hybrid couplings if the parts that belong together are the same. (Source: Horst E. von Renouard: Technical Dictionary Electronic Media and Services .)