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Cast iron pressure pipes VChShG
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Description
Ductile Iron Pressure Pipes (DI) are modern pipe products made of high-strength ductile iron with spherical graphite, possessing high strength, corrosion resistance, and durability. Widely used for water supply, sewage, and other pressure pipeline systems.
Production Technology
The manufacturing process includes several stages:
1. Melting and Iron Preparation: Iron is melted in furnaces and brought to the required chemical composition.
2. Modification: Magnesium modifiers are introduced into the molten iron to transform graphite into a spherical form.
3. Centrifugal Casting: The melt is poured into rapidly rotating molds of centrifugal machines.
4. Heat Treatment: Castings are annealed to relieve internal stresses.
5. Mechanical Processing: Bell and spigot ends with sealing grooves are machined on the ends.
6. Applying Coatings: Internal and external surfaces are protected with anti-corrosion coatings.
Characteristics and Assortment
• Nominal Bore (DN): DN 80 - DN 1000 mm.
• Pipe Length: 3-6 meters (standard), up to 9 meters (upon request).
• Working Pressure:
o Class LA - up to 2.5 MPa (25 atm)
o Class A - up to 3.2 MPa (32 atm)
o Class B - up to 4.0 MPa (40 atm)
• Connection Types: bell and spigot with rubber seals, flanged, coupled.
Advantages
• High Corrosion Resistance 3-5 times higher than that of steel pipes.
• Durability – service life over 50-80 years.
• Easy Installation – connections without welding.
• Hydraulic Efficiency – low head losses.
• Resistance to Water Hammer and pressure fluctuations.
• Environmental Safety – do not affect water quality.
• Repairability – possibility of local repair.
Areas of Application
• Water Supply: main and distribution networks.
• Sewerage: pressure sewer systems.
• Firefighting: fire water supply systems.
• Industry: process pipelines.
• Land Reclamation: irrigation and drainage systems.
• Hydraulic Structures.
Normative Documentation (GOST Standards)
Main standards regulating the production of DI pipes:
GOST R ISO 2531-2022 – "Ductile iron pipes, fittings and accessories for water and gas pipelines"
• Defines technical requirements for DI pipes.
• Establishes assortment and mechanical properties.
• Regulates test methods and quality control.
GOST 9583-2018 – "Cast iron pressure pipes manufactured by centrifugal and semi-continuous casting methods. Technical specifications"
• Establishes requirements for materials and coatings.
• Defines acceptance and marking rules.
• Regulates transportation and storage conditions.
Additional Normative Documents:
• STO 02494733-005-2009 – Design and installation rules.
• GOST 5525-88 – Cast iron pressure flanges.
Material Requirements:
• Iron Grade: DI 40, DI 50, DI 60, DI 70, DI 80.
• Coatings: cement-mortar (internal), zinc + bituminous (external).
• Seals: rubber rings according to GOST 26381.
Ductile Iron Pressure Pipes (DI) are modern pipe products made of high-strength ductile iron with spherical graphite, possessing high strength, corrosion resistance, and durability. Widely used for water supply, sewage, and other pressure pipeline systems.
Production Technology
The manufacturing process includes several stages:
1. Melting and Iron Preparation: Iron is melted in furnaces and brought to the required chemical composition.
2. Modification: Magnesium modifiers are introduced into the molten iron to transform graphite into a spherical form.
3. Centrifugal Casting: The melt is poured into rapidly rotating molds of centrifugal machines.
4. Heat Treatment: Castings are annealed to relieve internal stresses.
5. Mechanical Processing: Bell and spigot ends with sealing grooves are machined on the ends.
6. Applying Coatings: Internal and external surfaces are protected with anti-corrosion coatings.
Characteristics and Assortment
• Nominal Bore (DN): DN 80 - DN 1000 mm.
• Pipe Length: 3-6 meters (standard), up to 9 meters (upon request).
• Working Pressure:
o Class LA - up to 2.5 MPa (25 atm)
o Class A - up to 3.2 MPa (32 atm)
o Class B - up to 4.0 MPa (40 atm)
• Connection Types: bell and spigot with rubber seals, flanged, coupled.
Advantages
• High Corrosion Resistance 3-5 times higher than that of steel pipes.
• Durability – service life over 50-80 years.
• Easy Installation – connections without welding.
• Hydraulic Efficiency – low head losses.
• Resistance to Water Hammer and pressure fluctuations.
• Environmental Safety – do not affect water quality.
• Repairability – possibility of local repair.
Areas of Application
• Water Supply: main and distribution networks.
• Sewerage: pressure sewer systems.
• Firefighting: fire water supply systems.
• Industry: process pipelines.
• Land Reclamation: irrigation and drainage systems.
• Hydraulic Structures.
Normative Documentation (GOST Standards)
Main standards regulating the production of DI pipes:
GOST R ISO 2531-2022 – "Ductile iron pipes, fittings and accessories for water and gas pipelines"
• Defines technical requirements for DI pipes.
• Establishes assortment and mechanical properties.
• Regulates test methods and quality control.
GOST 9583-2018 – "Cast iron pressure pipes manufactured by centrifugal and semi-continuous casting methods. Technical specifications"
• Establishes requirements for materials and coatings.
• Defines acceptance and marking rules.
• Regulates transportation and storage conditions.
Additional Normative Documents:
• STO 02494733-005-2009 – Design and installation rules.
• GOST 5525-88 – Cast iron pressure flanges.
Material Requirements:
• Iron Grade: DI 40, DI 50, DI 60, DI 70, DI 80.
• Coatings: cement-mortar (internal), zinc + bituminous (external).
• Seals: rubber rings according to GOST 26381.
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