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OKorder is offering high quality K7 CLASS DN200 Ductile Iron Pipe and Pipe Fittings at great prices with worldwide shipping. Our Pipe and Pipe Fittings are available in a wide range of styles and materials, and are guaranteed with a full warranty. Our supplier is a world-class manufacturer of Ductile Iron, and our products are utilized the world over, with OKorder annually supplying a full range of products to European, North American and Asian markets. We provide quotations within 24 hours of receiving an inquiry and guarantee a competitive price.


Product Applications:

Our K7 CLASS DN200 Ductile Iron Pipe and Pipe Fittings are incredibly reliable and ideal for potable water transmission and distribution as well as utility projects (water and sewer).


Product Advantages:

OKorder's K7 CLASS DN200 Ductile Iron Pipe and Pipe Fittings are of the highest quality and we offer external coatings and internal linings as well as accessories such as SBR/EPDM rubber gaskets, lubricant paste, pipe caps, PE sleeves, etc. We include a copy of the original inspection reports upon shipment, photos of the loading process sent to the customer, and delivery progress weekly updates


Main Product Features:

·         Strict inspections according to related standards

·         Easy installation and service-free

·         Extended service lifespan


Product Specifications:

Material: Ductile Cast Iron

Sizes: DN 80mm – DN 2000mm

Effective Length: 6m – 5.7m

Standards: ISO 2531:1998 / EN 545:2006 / EN 598:2007

Annual Capacity: 200,000 tons

Coating: Zinc 130g/m² (ISO 8179-1); 70 micron bitumen coating

Cement: Portland Cement / High Alumina Cement / Sulphate Resisting Cement Lining (ISO 4179)



Q1: Why buy Materials & Equipment from OKorder.com?

A1: All products offered by OKorder.com are carefully selected from China's most reliable manufacturing enterprises. Through its ISO certifications, OKorder.com adheres to the highest standards and a commitment to supply chain safety and customer satisfaction.

Q2: How do we guarantee the quality of our products?

A2: We have established an advanced quality management system which conducts strict quality tests at every step, from raw materials to the final product. At the same time, we provide extensive follow-up service assurances as required.

Q3: What is the difference between Cast Iron and Ductile Iron?

A3: Cast iron is a generic name for any high carbon molten iron poured as a casting. When used to refer to pipe, cast iron (sometimes called gray iron) is a specific type in which the free graphite (Carbon) is in the shape of flakes. Ductile Iron is a specific type of cast iron in which the free graphite is in the shape of nodules or spheroids. Although nearly identical chemically, the two irons are quite different metallurgically. The current standard for Ductile Iron Pipe (ANSI / AWWA A21.51 / C151) requires a minimum grade of 60-42-10 (60,000psi Ultimate Tensile Strength, 42,000psi Yield Strength, and 10% Elongation). Although Cast Iron was the best engineering material available for pipe production for nearly five hundred years, the development of Ductile Iron Pipe provides a far superior product.

Q4: How much thermal expansion should I allow for?

A4: The linear expansion of ductile iron pipe as a result of thermal effects is very small, with ductile iron expanding less than concrete. For rubber gasketed joints and mechanical joints assembled in accordance with the manufacturer’s instructions, there is enough clearance from the face of the plain end of the pipe to the back of the bell to account for significant thermal growth before beginning to make metal-to-metal contact. Except for very long runs of exposed piping, particularly if flow is intermittent, thermal expansion is usually not a concern.

Q5: What is the maximum velocity recommended for cement-lined Ductile Iron pipe?

A5: Although there are differing opinions on this subject, a conservative maximum velocity for design purposes is 7 fps (feet per second). Ductile Iron pipe may be rated as high as 350 psi service. A pipeline operating at 7 fps velocity could account for a 350 psi pressure surge (7fps X 50 psi/fps). Adding a potential surge pressure equal to the pressure rating of the pipe encroaches significantly on the safety factor. Exceeding 7 fps velocity could produce potentially damaging surge pressure.

Q6: Can cement-mortar linings be repaired in the field?

A6: Repair is achieved by first cutting out the defective or damaged lining to the metal so that the edges of the lining not removed are reasonably perpendicular to the pipe wall or slightly undercut. A stiff mortar is then prepared and applied to the cutout area and troweled smooth with adjoining lining. To provide for proper curing of patches by preventing too rapid of a moisture loss from the mortar, the patched area is normally seal-coated immediately after any surface water evaporates, or alternatively the area is kept moist (e.g. with wet rags or burlap over the area or with the ends of the pipe or fitting taped over with plastic film, etc.). Of course, in potable water-related applications, no patch or curing components should be used in the repair that would negatively affect health or water quality.

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