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Specification
 
 


Ductile Iron Pipe:

 

1. Remarkable mechanical properties

 

Ductile Iron Pipe

Grey Cast Iron Pipe

Steel pipe

 Tensile Strength     (N/mm²) 

          ≥420            

150-260

  ≥400    

 Elongation ( % )

DN80-1000mm≥10    DN1200-2600mm≥7

 Negligible

 ≥18    

 Hardness  (HB)

 ≤230   

 ≤230  

 Approx.140

 

2. Ductile Iron Pipe Hydro Test Pressure


Norminal Diameter

Hydro Test Pressure for K9 pipe, ( Mpa )

80-300

5.0

350-600

4.0

700-1000

3.2

1100-2000

2.5

2200-2600

1.8

 

 

Ductile Iron Fittings:

Mechanical properties and technical manual

 1.Mechanical properties:

Name Tensile Strength Elongation Yield Strength Hardness
Ductile iron fittings ≥420MPa ≥5% ≥300MPa ≤250HB

 

2. Hydrostatic test:

Norminal Diameter mm Pressure Test time
≤300 ≥25 Pa ≥15S
350-600 ≥16 Pa ≥15S
≥700 ≥10 Pa ≥10S

 

3. Lining and Coating

3.1 Fittings for water transportation should be with cement mortar lining and for gas
transportation should be with bitumen inside. External should coated rich zinc
paint and bitumen paint.
3.2 The average weight of zinc ≥150g/㎡, the min thickness ≥130g/㎡.
3.3 The average thickness of bitumen coating ≥70um, part min≥50um.
3.4 Cement mortar lining thickness and tolerance:

 

Norminal Diameter mm Linging Thickness mm Average min thickness      mm Part min        mm Limited tolerance mm
≤300 3.5 2.5 2.0 +2 -1
350-600 5.0 4.5 3.0 +2 -1
700-1200 6.0 5.5 4.0 +2 -1

 

3.5. Other coating and lining 

      Sulphate resistance cement lining, high aluminium cement lining, epoxy coating and FBE (fusion bonded epoxy) coating are also available.