Ductile Iron Pipe K9, C class

Key Features of Ductile Iron Pipe K9

• Variety of Joint Options:

• T-Type Joint Pipe (Push-On): Easy to install and ensures a tight seal.

  
  

• K-Type Joint Pipe: Offers secure and reliable connections.

• Self-Restrained Joint Pipe: Resists movement and pressure surges, ensuring stability.

• High Mechanical Strength: Minimum tensile strength ≥420 N/mm², yield strength ≥300 N/mm², and elongation ≥7–10% for excellent pressure and impact resistance.
  

• Superior Corrosion Protection: Internal cement mortar lining for potable water and external zinc + polyethylene sleeving or bitumen coating for buried service.
  

• Push-On TYTON Joint: Flexible, easy-to-install TYTON joint ductile iron pipe with SBR/NBR/EPDM rubber gaskets for quick, leak-free assembly.
  

• Wide Size & Pressure Range: DN80–DN2600 diameters, pressure ratings 10–50 Bar, and effective lengths 5.7 m or 6 m.
  

• Earthquake & Long Service Life: Proven low damage rate (0.04 per km) and service life exceeding 50 years under normal conditions.
  

• Cost-Effective & Reliable: High material utilization, consistent wall thickness, and full compliance with international standards.

How to Choose the Right K9 Ductile Iron Pipe Specification

Most sourcing delays happen because the buyer only decides "ductile iron pipe" and leaves class, joint type and coating to be sorted out later — that's the part that should happen before the quote, not after. Here's how to narrow it down in three steps.

Step 1 — Pick the Wall Thickness Class (K-Class or C-Class)

K9 Ductile Iron Pipe is our default recommendation for standard municipal and industrial pressure mains, but it isn't the only class we produce. Wall thickness under ISO2531/EN545 is set by a K-value (thicker wall, higher pressure and impact tolerance) or, alternatively, by a C-value pressure class used on some EN-based projects.

Preferred pressure class by diameter (based on our standard production range):

Not sure which class your project needs? Send us your required working pressure, surge allowance, and burial depth — our engineers will confirm the correct class before you commit to a quantity.

Step 2 — Pick the Joint Type

Step 3 — Pick the Coating & Lining

Still unsure which combination fits your project? Request a Quote with your working pressure, soil report (if available), and installation method — we'll recommend the K9 Ductile Iron Pipe configuration (class, joint, coating) that matches your project spec, not just sell you the default.

Applications of Ductile Iron Pipe K9

K9 Ductile Iron Pipe covers the pressure range most infrastructure buyers actually need across four project types:

• Municipal water supply & distribution networks — potable water mains under EN545, from trunk mains down to distribution branches.

• Sewage and drainage systems — under EN598, with enhanced corrosion resistance for aggressive effluent.

• Irrigation and agricultural conveyance — long-distance pressure mains where downtime cost of pipe failure is high.

• Industrial process piping — cooling water, fire protection loops, and other non-corrosive industrial fluid transport.

Applicable Standards

For potable water

ISO9001 Quality systems-model for quality assurance in design development production,installation and

ISO 2531 Ductile iron pipes,fittings and accessories for pressure pipelines.

BS EN545 Ductile iron pipes,fittingsand accessories and their joints for water pipelines.Requirements and test

"ISO4179 Ductile iron pipes for pressure and non pressure pipelines-Centrifugal cement mortar lining-general

requirements."

ISO8179 Ductile iron pipes-External zinc coating.

BS3416 Specification for Bitumen based coatings for cold application,suitable for usein contact with potable

ISO4633 Rubber Seals -joint rings for water supply,drainage and sewerage pipelines specs for materials.

ISO 8180 Ductile iron pipes -Polyethylene Sleeving.

EN681-1 Elastomeric seals material requirements for pipe joint seals used in waterand drainage application.

For sewage application

BS EN598 Ductile iron pipes,fittings,accessories and their joints for sewage application requirements and test

ISO4633 Rubber seals-joint ringsfor water supply,drainage and sewerage pipelines specs for materials.

EN681-1 Elastomeric seals material requirements for pipe joint seals used in water and drainage application.

"All MIDAS pipes are manufactured complying with standards:

-ISO2531

-EN545

-EN598"

Certifications

• ISO9001 for quality assurance.

• BV, WRAS, and SGS certifications for performance and reliability.

FAQs 

What pressure levels can K9 pipes handle?

K9 pipes are designed for pressure ratings ranging from 10 Bar to 50 Bar, depending on the application and pipe dimensions.

Which internal coating is best for potable water? 

Cement mortar linings are typically recommended for potable water, while fusion-bonded epoxy may be suitable for specific requirements.

What is the typical service life of K9 pipes? 

With proper maintenance, these pipes can last over 50 years, ensuring long-term reliability.

Can additional components like gaskets and bolts be provided? 

Yes, we supply gaskets, bolts, and nuts as per your specific requirements.

What factors influence the price of K9 ductile iron pipes? 

Prices depend on pipe size, wall thickness, coatings, market demand, and purchase volume. Contact us for detailed pricing.

Are custom coatings and lengths available? 

Yes, coatings such as PU lining and other specialized options can be provided. Standard lengths are 6m and 5.7m, but customized lengths can be arranged based on project needs.

What is the difference between K7 and K9 Ductile iron pipe? 

Ductile Iron Class K7 Pipes can handle less pressure than Ductile Iron Class K9 Pipes. The pressure rating of K7 ductile iron pipes varies and this would base on the Nominal Diameter and the Nominal Wall Thickness of the pipe.