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A. Socket pipe
The Ductile Iron Pipe manufactured and supplied by Growth Pamindo conform to International Standards ISO 2531-1998 and
British Standards BS EN 545-1995.
Ductile Iron pipe manufactured by Growth Pamindo provide an entirely leak-tight, reliable pipeline solution for pumped water and
wastewater application, available in class K9 and K12 Ductile iron for addressing a wide range of stress and load application.
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| B. Flanged Pipes |
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Flanged Pipe with Welded on Flanges
Welded flange pipes are available on order basis for length of 5.9m or below Class K9 and K12.
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Flanged Pipe with Screwed on Flanges
Screwed flange pipes are available on order basis for length of 5,9m or below for class K9 and K12.
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Restrained Joint
Restrained joints are available for above ground, or unstable ground, instalation.
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C. Mechanical properties
The following technical information is in accordance with ISO 2531 and BS EN 545 Ductile Iron Pipes for water and gas pipelines.
D. Hydrostatic Test Pressure for Class > K9
Hydraulic pressure test is carried out on all pipes before the application of their internal and external coatings.
The internal hydrostatic pressure is raised steadily until it reaches the work hydrostatic test pressure given in table below, which
is maintained for a sufficient time to allow visual inspection of the pipe barrel.
E. Tolerances on the Standard Masses
The mass of pipes are calculated by taking the density of cast iron 7,050 kg/m3.
Manufacture of Ductile Iron Pipe
Growth Pamindo Ductile Iron Pipe is manufactured using selected material and up to date technology.
Its wealth of experience and expertise in the iron founding industry enable
Growth Pamindo to produce high quality Ductile Iron Pipe.
Quality Control procedures are exercised though out all production cycles from the selection of raw material, microscopic
examination of metal structure, hydraulic pressure test, dimensional inspection and material tests for tensile strength, elongation and
hardness.
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A. Melting
Steel scrap with minimal impurities and ferroalloy are melted at over 1,5000C in
an electric induction furnace. When composition and temperature are accurately
adjusted, melt is directed into the ladle after tapping from the furnace. The
melt is mixed with magnesium and inoculants so that it becomes spherical which
gives the material excellent ductility.
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B. Centrifugal Casting
A refractory coating is sprayed onto the inner surface of the die and a core made of resin coated sand is placed in the end to
form the shape the socket. Melt is carefully poured into the fast spinning die and centrifugal force forms the pipe into
the shape of the die and the sand core. The refractory coating in the die retards the cooling of the pipe and prevents
the formation of carbides.
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C. Heat Treatment
Through the annealing furnace, pipes are heat processed at temperature of 7500C for several hours in order to refine the metal
microstructure thereby improving the ductility.
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D. Cleaning
After removal from the heat treatment, pipe is sent for shot blasting to near-white to prepare for external coasting.
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E. Cropping
The socket and spigot ends are cleaned and cropped to size. Specimens are taken for tensile testing.
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F. Hydraulic Pressure Test
Pipe is further tested for strength and leak tightness under high pressure in the hydraulic testing machine.
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G. Galvanizing
Pipe is externally protected with a nominal of 130 g/m2 coating of metallic zinc. Under this process, zinc is electric arc sprayed onto
the warm dry surface of the pipe.
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H. Mortar Lining
The pipe is lined with high quality cement and sand mortar. Mortar is poured into a pipe rotating at high speed to spread the mortar
evenly over the inner surface of pipe. Mortar lining makes pipe more resistant to corrosion and minimizes tuberculation within pipe.
The cement mortar lining when saturated with water produces a high PH solution within it next to the pipe wall.
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I. Outside Coating
The exterior of Ductile iron Pipe is coated with bituminous paint providing additional protection to the zinc. It is applied to
the surface of pipe by the airless spray method.
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J. Final Inspection
All pipes are given a final check before shipping. Our strictest quality control assures that Growth Pamindo products are durable for
long term installation under severest conditions.
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Jointing
A. Tyton® Joint Method
Growth Pamindo Ductile Iron Pipes incorporate the proven Tyton® type Jointing system that provides
long-term, leak free performance and angular deflection to accommodate unforeseen ground movements, can be installed quickly and easily
without the need for a specialist site equipment. Tyton joint has automatic centering of the spigot in the socket and it provides low
cost because labor adapts itself to the very simple assembly of Tyton® joints.
The Tyton® joints is an extremely strong and efficient coupling in extensive use on piped water mains throughout the world. Apart from
normal anchoring precautions on bends and tees, etc.…., no joint holes are necessary and the simple push fit connection with
only a single separate component, the special rubber seal allows rapid low cost pipe laying even in the wet conditions.
B. Installation
Jointing Instruction:
- Ensure cleanliness of inside of socket, spigot and rubber seal.
- Apply Lubricant to surface shown in Fig. 5.2. Take care not to allow any foreign matter to adhere on this sticky
lubricant surfaces.
- Position the spigot for alignment and ensure proper contact with rubber seal. Use suitable tools to force entry of plain
end pipe on the seal seating and into the socket as per Fig. 5.2. Check for deflection tolerance when deemed necessary.
Caution: Improper forced entry of spigot to socket may cause rubber seal to rupture and cause leak.
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