Class K8 DN2600 ductile iron pipe combines medium‐pressure capability, proven longevity and versatile installation methods to meet the most demanding water, sewage, irrigation, gas and fire-protection requirements. With a nominal wall thickness of 24.8 mm (e = K × (0.5 + 0.001 × 2600), K = 8) and rated PN 12.5 (1.25 MPa), it delivers over 100 years of service life when cement-mortar lined and externally protected with polyethylene sleeving . Installation is expedited via Tyton push-on, AWWA C111 mechanical or flanged (socket/flanged per GB/T 13295) joints, ensuring leak-free performance in the field . Compared with adjacent classes—K7 (20.3 mm), K9 (26.1 mm) and K12 (34.8 mm)—the K8 series balances material cost (US $875–895 / ton for DN2600) and strength requirements . Backed by ISO 2531, GB/T 13295, AWWA C104, AWWA C111, ISO 8180 and BS EN 969 standards, and validated through life-cycle analyses showing a $47.68 / ft cost advantage over PVC with a $17 million PV benefit over 50 years, Class K8 DN2600 is the premium choice for long-term pipeline performance .
Applications
Potable Water Distribution
DN2600 mains deliver reliable, leak-tight water supply across municipal networks with minimal head loss and superior turbulence resistance .
Sewage & Drainage
Abrasion-resistant core and smooth cement-mortar lining convey grit-laden wastewater effectively in gravity or pressure systems .
Irrigation Systems
Uniform hydraulic performance under variable flow demands supports large-scale agricultural distribution and turf irrigation .
Gas Distribution
When manufactured and tested per BS EN 969, DN2600 K8 pipes safely transport natural gas up to 16 bar with certified joint integrity .
Fire-Protection Mains
High surge resilience and ductility ensure dependable water delivery to hydrant feeders and sprinkler networks under emergency conditions .
Service Life
Modern ductile iron pipeline systems routinely exceed 100 years in benign conditions, owing to high-strength nodular-graphite iron and robust linings .
Cement-mortar lining (ANSI/AWWA C104) prevents internal corrosion and maintains smooth hydraulics for over a century .
Polyethylene sleeving per ISO 8180 adds approximately 10 years of external corrosion protection in aggressive soils, as demonstrated in Everglades field trials .
Life-cycle cost analyses (AWWA) show $47.68 / ft net savings over PVC mains, yielding a $17 million PV advantage over 50 years .
Installation & Connection
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Push-On (“Tyton”) Joints: Spigot-socket with elastomeric gasket for bolt-free, rapid assembly per ISO 2531 dimensions .
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Mechanical (Restrained) Joints: Gland-and-bolt system per AWWA C111 for both unrestrained and restrained connections .
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Flanged Joints: Socketed or flanged ends per GB/T 13295(DN40–DN2600) allow disassembly and accommodate axial loads .
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Field Best Practices: 150 mm well-graded bedding, ≤ 3 % deflection limits, hydrostatic testing and chlorination per ISO 2531/AWWA C600 guidelines maximize joint integrity and longevity .
K-Series Comparison & Pricing
| Class | Wall Thickness (mm) | Pressure Rating | Price (USD / ton) |
|---|---|---|---|
| K7 | 20.3 = 7×(0.5+0.001×2600) | PN 10 (1.0 MPa) | $875–895 |
| K8 | 24.8 = 8×(0.5+0.001×2600) | PN 12.5 (1.25 MPa) | $875–895 |
| K9 | 26.1 = 9×(0.5+0.001×2600) | PN 16 (1.6 MPa) | $875–895 |
| K12 | 34.8 =12×(0.5+0.001×2600) | PN 25 (2.5 MPa) | $875–895 |
International Standards
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ISO 2531:2009 – Dimensions, linings & joint performance for ductile iron pipelines.
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GB/T 13295-2019 – Chinese standard for pipes, fittings & joints (DN40–DN2600).
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ANSI/AWWA C104/A21.4 – Cement-mortar lining requirements for potable water service.
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ANSI/AWWA C111/A21.11 – Mechanical-joint dimensions for DN 80–600 mm (extendable).
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ANSI B16.1 / EN 1092-2 – Flanged-joint dimensions & pressure classes.
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ISO 8180:2020 – Polyethylene sleeving for external corrosion control.
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BS EN 969:2009 – Requirements & test methods for gas-pipeline ductile iron pipes and accessories.
Advantages
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Exceptional Longevity: 100+ year service life minimizes disruption and replacement costs .
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High Strength & Toughness: Tensile ≥ 350 MPa withstands surge pressures and external loads .
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Comprehensive Corrosion Control: CML, zinc/bitumen coatings and LPS deliver multi-barrier protection .
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Joint Versatility: Multiple joint options (Tyton, mechanical, flanged) adapt to any field requirement .
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Sustainability: Made from recycled iron, fully recyclable with lower life-cycle energy than PVC or HDPE .
FAQ
Q1: How do K-series classes differ?
They follow e = K (0.5 + 0.001 × DN)—for DN2600, K7=20.3 mm, K8=24.8 mm, K9=26.1 mm, K12=34.8 mm, correlating to PN 10/12.5/16/25 respectively .
Q2: Which joint type is best?
– Tyton push-on for rapid, bolt-free assembly; Mechanical for restrained connections; Flanged for high axial-load & maintenance access .
Q3: Is polyethylene sleeving necessary?
Recommended in aggressive soils for an extra ~10 years protection; proven by DIPRA studies .
Q4: What sizes & laying lengths are offered?
DN 80–2600 mm, standard 6 m (5.7 m for shipping containers), custom cuts on request .
Q5: Can DI pipe be used in seismic zones?
Yes—restrained joints (tie-rod, ball-and-socket) handle ground movement and axial loads for seismic resilience .
Case Studies
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Huntsville Utilities, AL: AWWA life-cycle analysis reports $47.68/ft net savings and $17 million PV benefit over 50 years (24″ DIP vs. PVC) .
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Everglades City, FL: Polyethylene-encased pipes remained in “excellent condition” after 10+ years in corrosive muck (140–240 Ω-cm).
ductile iron pipe dimensions
| Pipe body weight （kg/m) | |||||||||||||||
| (Inside Diameter) | (Outside Diameter) | Socket Weight | K8 | K9 | K10 | C class | Total weight of Active Length=6M (kg) | Total weight of Active Length=5.7M (kg) | |||||||
| DN(mm) | OD(mm) | ≈ kg | Class | kg/m | K8 | K9 | K10 | C class | K8 | K9 | K10 | C class | |||
| 80 | 98 | 3.40 | 12.20 | 12.20 | 12.20 | C40 | 9.10 | 77.00 | 77.00 | 77.00 | 58.00 | 73.00 | 73.00 | 73.00 | 55.00 |
| 100 | 118 | 4.30 | 14.90 | 15.10 | 15.10 | C40 | 11.12 | 93.70 | 95.00 | 95.00 | 71.00 | 90.00 | 91.00 | 90.00 | 68.00 |
| 125 | 144 | 5.70 | 18.90 | C40 | 119.00 | ||||||||||
| 150 | 170 | 7.10 | 21.80 | 22.80 | 22.80 | C40 | 16.48 | 138.00 | 144.00 | 144.00 | 106.00 | 132.00 | 138.00 | 137.00 | 101.00 |
| 200 | 222 | 10.30 | 28.70 | 30.60 | 30.60 | C40 | 22.62 | 183.00 | 194.00 | 194.00 | 146.00 | 174.00 | 185.00 | 185.00 | 139.00 |
| 250 | 274 | 14.20 | 35.60 | 40.20 | 44.30 | C40 | 32.63 | 228.00 | 255.00 | 280.00 | 210.00 | 218.00 | 244.00 | 267.00 | 200.00 |
| 300 | 326 | 18.90 | 45.30 | 50.80 | 56.30 | C30 | 43.90 | 290.00 | 323.00 | 357.00 | 282.00 | 278.00 | 309.00 | 340.00 | 269.00 |
| 350 | 378 | 23.70 | 55.90 | 63.20 | 69.60 | C30 | 51.88 | 359.00 | 403.00 | 441.00 | 335.00 | 343.00 | 384.00 | 420.00 | 319.00 |
| 400 | 429 | 29.50 | 67.30 | 75.50 | 83.70 | C30 | 60.78 | 433.00 | 482.00 | 532.00 | 394.00 | 414.00 | 460.00 | 506.00 | 376.00 |
| 450 | 480 | 38.30 | 80.00 | 89.30 | 99.00 | C30 | 73.30 | 515.00 | 575.00 | 632.00 | 472.00 | 492.00 | 550.00 | 597.00 | 450.00 |
| 500 | 532 | 42.80 | 92.80 | 104.30 | 115.60 | C30 | 87.20 | 600.00 | 669.00 | 736.00 | 566.00 | 572.00 | 638.00 | 702.00 | 540.00 |
| 600 | 635 | 59.30 | 122.00 | 137.30 | 152.00 | C30 | 120.62 | 791.00 | 882.00 | 971.00 | 783.00 | 755.00 | 842.00 | 926.00 | 747.00 |
| 700 | 738 | 79.10 | 155.00 | 173.90 | 193.00 | C25 | 142.15 | 1009.00 | 1123.00 | 1237.00 | 932.00 | 963.00 | 1071.00 | 1179.00 | 889.00 |
| 800 | 842 | 102.60 | 192.00 | 215.20 | 239.00 | C25 | 177.07 | 1255.00 | 1394.00 | 1537.00 | 1165.00 | 1197.00 | 1330.00 | 1465.00 | 1112.00 |
| 900 | 945 | 129.60 | 232.00 | 260.20 | 289.00 | C25 | 197.68 | 1521.00 | 1691.00 | 1863.00 | 1446.00 | 1452.00 | 1613.00 | 1777.00 | 1257.00 |
| 1000 | 1048 | 161.30 | 275.00 | 309.30 | 343.20 | C25 | 266.28 | 1811.00 | 2017.00 | 2221.00 | 1759.00 | 1729.00 | 1925.00 | 2118.00 | 1679.00 |
| 1100 | 1152 | 194.70 | 362.80 | 2372.00 | |||||||||||
| 1200 | 1255 | 237.70 | 374.00 | 420.10 | 466.10 | C25 | 373.88 | 2482.00 | 2758.00 | 3034.00 | 2481.00 | 2370.00 | 2632.00 | 2894.00 | 2369.00 |
| 1400 | 1462 | 279.30 | 547.20 | 3563.00 | |||||||||||
ductile iron pipe Mechanical property
| Mechanical Property | |||||||
| Nominal Diameter | Hydraulic test | Tensile strength | Elogation | Yield strength | Bending strength | Brinell hardness | Thickness of cement lining |
| DN(MM) | Mpa | Mpa | % | Mpa | Mpa | HB | mm |
| DN80-DN300 | 5 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 3 |
| DN350-DN600 | 4 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 5 |
| DN700-DN1000 | 3.2 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 6 |
| DN1100-DN1600 | 2.5 | ≥420 | ≥7 | ≥300 | ≥590 | ≤230 | ….. |
