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Joints & Connections

All Krah pipes are produced automatically with a socket and spigot, which are adaptable to the following kinds of jointing techniques:


Electro fusion joint


This is the most preferred joint system, as the whole pipe system becomes a homogenous unit. A welding wire which is included in the socket or spigot is heated with the help of a special welding device whereby the two pipe ends (the socket and the spigot) are jointed together. The electro fusion jointing technique is a very favorable, simple and secure method to install pipes in even very narrow trenches in a short time. For further information please refer to our brochure “Technology - integrated electro fusion joint“.


V seam extrusion welding
 


The pipes and fittings are jointed with the help of an extrusion welding extruder. The outside of the ends are chamfered. Thus a welding seam is produced which looks like “V“ Normally no socketspigot connection is used.

The welding has to be done according to DVS 2207 part 4.


Extrusion welding

 



The pipes and/or fittings which shall be connected are jointed by a socket and spigot joint. Thus the two pipe ends are connected with the help of an extrusion welding device. The jointing method can be carried out inside or/and outside of the pipe. This jointing is most suitable for low-pressure gravity pipes and manholes.

The welding has to be done according to DVS 2207 part 4.


Heat element butt welding
 



The pipes and fittings are jointed with the help of a heating element butt welding machine. The ends of the pipes and fittings are butt-welded. This kind of jointing method is only recommended for pipes and fittings with a maximum wall thickness of 150 mm and with diameters from DN/ID 300 mm to DN/ID 2500 mm.

The welding has to be done according to DVS 2207 part 1.


Flange connection
 




The ends of the pipes and fittings are jointed with the help of a steel flange and a rubber gasket. Depending on the type of pipe the flange adapters are completely manufactured with the pipe, or the flanges are available as separate fitting. This kind of jointing method is mostly used for open sea discharge application and for tank connections. The greatest advantage of this connection is the facility of disjointing.


Gasket connection
 




Our system has solid plain socket and spigot, with an integrated EPDM sealing. The minimum wall thicknesses of the spigot is according to EN13476-3 table 7 and in addition the ring stiffness of the socket plus the ring stiffness of the spigot is higher than the ring stiffness of the pipe.


Heat element butt welding
In order to lead Krah pipes through walls, e.g. in sewage plants or concrete shafts, we recommend our puddle flanges which can be flush mounted in concrete. The tightness is secured by an anchor and a ring made of EPDM.

 
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