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Views: 45 Author: EAGLE co Publish Time: 2018-08-24 Origin: Site
The plastic pipe is widely used for sewer, storm water drainage application in the world. There are many types of plastic pipe such as HDPE/PP double wall corrugated pipe, HDPE hollow profile pipe and HDPE/PP profile spiral wounded pipe (Krah pipe), etc. The photo and wall structure are as follows.
HDPE Double wall corrugated pipe.
HDPE hollow profile wounded pipe
HDPE/PP profile spiral wounded pipe
Comparison of these pipe
| Items | Profile spiral pipe | Hollow wall pipe | Corrugated pipe |
| Diameter | DN300-DN4000 | DN300-DN3000 | DN200-DN1800 |
| Ring stiffness | SN2 to SN32 No limitation for ring stiffness | SN2 to SN8 | SN2 to SN8(less than DN1000, bigger diameter cannot reach SN8) |
| Life time | 100year if the connection is welding or depends on the connection such as rubber seal lifetime (normally it is about 20-30years) | ||
| Weight | Light | Heavy (about 20-30% higher than profile pipe) | Very light (up to DN800, bigger is higher than profile pipe) |
| Socket & spigot | Very strong, higher than standard | No socket | very weak, wall thickness cannot match standard |
| The wall thickness should be thicker than 17.2mm, if ring stiffness≥SN8 and ID≥400mm, according to the standard of EN13476-3 and EN 12666-1-2006 | |||
| Connection | Electro-fusion welding Rubber seal Flange Extrusion welding Butt welding | Electro-fusion belt Shrinkage sleeve | Rubber seal |
Connection Tightness | Very strong, especially any kind of welding | Not strong, depends on the fittings quality | Not strong due to the weak socket and pipe design |
| Flexibility | Very good | Very good | Very good |
| Pipe stability | Very stable due to hot winding, no tension in pipe | Not stable, due to the cold winding, there is tension in pipe | Stable |
| Inner surface | Evenness, smooth | Roughness, welding seal | Smooth, bigger diameter is with corrugation |
| Impact | Very good | Very good | Very good |
| Production | Short set up time 5-10minutes for any size, any ring stiffness, any wall profile from DN300 to DN3000, SN1 to SN16 on one machine | Long set up time, 6 to 10 hours | Very long set up time, especially large diameter Ring stiffness is fixed according to the mold design and with several machine. |
| Machine investment | low, one machine can produce all size | Low, several machine required | Very high, only fixed pipe stiffness classes |
| Pipe application | Sewerage, drainage, storm water, pressure pipe | Sewerage, drainage, non-pressure only | Sewerage, drainage, non-pressure only |
| Pipe standard | DIN 16961, EN13476, AMTM F894, ISO21138-2007 | ||
Conclusion:
The HDPE double wall corrugated pipe is better for the sewerage and drainage application and pipe diameter is upto DN400mm(if to use special fitting for connection, the diameter can be upto DN800mm). For the large diameter application, the best solution is HDPE/PP profile spiral wounded pipe.
