国内9l视频自拍|中文午夜人妻无码看片|日韩又大又长又粗视频|中文字幕aⅴ人妻一区二区|另类专区亚洲97在线视频|欧美不卡高清一区二区三区|亚洲精品无码AV中文永久在线|国产精品亚洲一区二区三区日韩

Wuxi Gotele Metal Corporation are delighted to provide our ductile iron pipe to the world’s customers. We are renowned for our product quality and after sales service. We export ductile iron pipe to global customers, features by its high strength and corrosion resistance, our product accept inspection. We also provide fittings and accessories for customer choice.

Specification of Ductile Iron Pipe
1. Standard: ISO2531-1998,EN545-2006,Class:K8,K9
2. Length: 6m for bulk shipping, 5.7m suitable for container
3. Inner surface: Inner surface cement according to ISO4179 and outer surface bitumen lining according to ISO8179

Ductile iron pipe is a pipe made of ductile cast iron commonly used for potable water transmission and distribution. 

This type of pipe is a direct development of earlier cast iron pipe, which it has superseded. 

The ductile iron used to manufacture the pipe is characterized by the spheroidal or nodular nature of the graphite within the iron. 

Typically, the pipe is manufactured using centrifugal casting in metal or resin lined moulds. 

Protective internal linings and external coatings are often applied to ductile iron pipes to inhibit corrosion: 

the standard internal lining is cement mortar and standard external coatings include bonded zinc, asphalt or water-based paint.

In highly corrosive environments loose polyethylene sleeving (LPS) to encase the pipe may also be used. 

Life expectancy of unprotected ductile iron pipes depends on the corrosiveness of soil present and tends to be shorter where soil is highly corrosive. 

However, a lifespan in excess of 100 years has been estimated for ductile iron pipelines installed using "evolved laying practices", 

including use of properly installed LPS (polyethylene encasement). 

Studies of ductile iron pipe's environmental impact have differing findings regarding emissions and energy consumed.