12 foot diameter corrugated pipe for dranage culvert briage  is also called corrugated pipe culvert or corrugated metal pipe refers to the screw corrugated pipe buried in the road or under the railway culvert. It is circular corrugated pipe that composed of corrugated metal coils or semi-circular corrugated steel sheet. 

Steel Pipe Specification

Packing:  Covered by ploy on pallets, or other packages suritable for seaworthy.

Shipping: Within one month after contract signed.

First Tower Co., Ltd. located in the famous China's largest production base. The capital is more than 5000 million RMB, with more than 400 existing stuff nowadays, covering an area of more than 60 acres. Our company is a combination of design, production, transportation, installation and maintenance. The main products are corrugated metal culverts, assembled corrugated culverts, iron tower,transmission line tower, telecomunication towers, etc.

Our products have passed ISO9001:2008 standard. Passing through SGS test, up to EN, ANSI and Austrilia standard.

Quality Management system:

• ISO 9001:2008 certificate .
• Many steps guarantee no fissure, scar, overlap, layer or other defects, internal and external welding makes the pole more beautiful in shape
• Before  production, all the material must be passed the chemical and physical analysis to   make sure that they have met the requested strength and component.

Inspection system:

• Inpection team : Experienced engineers, technonolgy workers, advanced test equipments .
• Qulity system: GB/T19001-2008-ISO9001,GB/T 24001-2004-ISO 14001,GB/T28001-2001
• Manufacture standard: ASTM A123 or AS/NZS 4680:2006,  AWS ( American Welding Society ) D 1.1  or Euro standard.