Polyethylene（PE）Spiral structured wall pipe (Kra pipe) is a new type of irregular structured wall pipe made of high-density polyethylene（HDPE）As the main raw material, small in sizePPorPECorrugated pipes are used as auxiliary support pipes, and high-density polyethylene large-diameter winding reinforcement pipes are produced using hot winding molding technology. Because this type of pipeline was originally introduced by a domestic company from the German Kra company, it is commonly referred to as Kra pipe in China. The national standard is《GB/T 19472.2-2004Buried polyethylene(PE)Structural Wall Pipeline System2Partial polyethylene wrapped structural wall pipes. Caliber fromDN300-DN4000The pipe material is lightweight and has good overall flexibility, making it one of the main pipes for buried sewage and drainage at present.

HDPE wrapped structural wall pipes (carat pipes) will produce sockets online during the production process, so electric fusion connections or rubber ring sealed socket connections can be used.

1. Kra tube electric melting connection process：

Check whether the socket of the pipeline is damaged and whether the heating wire is intact;

Clean the debris on the surface of the electric fusion socket to ensure that the connection surface is clean and dry；

Insert the pipe socket end into the electric fusion socket, fix it with a steel buckle, and tighten it with a clamp;

Welding: Use a special electric melting welding machine for Kra tubes to select appropriate melting parameters and weld and tighten in stages until the socket is completely matched;

Cooling: After welding is completed, cut off the power and let it cool naturally without water cooling. The cooling time should be more than 20 minutes in summer and more than 15 minutes in winter；

After cooling, remove the steel buckle and check the welding condition.

The characteristics of electric fusion welding for Kela pipe socket and socket are that the pipe connection adopts the same material socket and electric fusion connection technology with pre embedded electric fuses in the socket. The connection quality is high, and the interface has zero leakage, ensuring the safety of pipeline system operation, extending the service life of the road, and effectively protecting groundwater sources and soil from pollution.

2. Clam tube rubber sealing ring connection:

The method is the same as that of double wall corrugated pipe, see: http://www.cstzsj.com/products/hdpesb.html

• Municipal drainage and sewage pipelines;
• Underground drainage pipelines in buildings;
• Long distance water pipeline;
• Irrigation pipelines for farmland water conservancy;
• Industrial water and drainage pipelines;