• Mail
  • Contact
  • Catalog

body text

General Comparison

General Comparison Table of COD to Conventional Duct
Category Conventional P.V.C. Duct C.O.D. (Corrugated Optic Duct)
- PVC: vulnerable to impaction damage

- Disconnection: Possibility of dis-connection of connected points of outer duct due to ground compressive load.

- Thermal expansion & contraction during the installation period and in service
- Stand good against impaction damage and no damage risk from freezing temperature.

- Strong Concavo-convex shape provides good strength and stays same shape against ground compressive load.

- Stays stable from thermal expansion & contraction of duct during or after installation
Installation - Many individual connections: maximum length is 6 meters.

- To construct manhole to diverse direction of the line.

- Complicated installation work as the insertion of inner ducts is in the second stage after the installation of outer duct.

- Causes traffic troubles (jamming) in case of urban installation.

- Inner duct may twist in the course of insertion.

- Maximum number of inner duct is limited to 3 ducts.
- No duct connections in-between two manholes up to 500 meters or more.

- Single installation process: No need to go through complicated inner duct insertion process owing to readily built-in both outer and inner ducts.

- To by-pass minor hurdles and skips un-necessary construction of manhole to diverse direction of line within the radiation of curbing angle.

- Increase of duct efficiency by increase of numbers of inner ducts to be inserted up to 5 ducts at approx. same price.

- Light weight allows easy handling and transportation.
Economy - High construction cost. - Economic construction cost and time saving