Centrifugal cast GRP pipes
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These pipes produced by Superlit are manufactured by means of centrifugal cast method.
Specifications of the Centrifugal cast sleeve pipes
The Pipes and Fittings are designed for underground and above ground piping systems to transport sewage, seawater, aggressive chemicals, and potable water under pressure and gravity flow. The pipes and fittings are manufactured under strict quality standards and are remarkable for their great strength, outstanding chemical resistance and low weight.
The standard size varies from diameters of 400 mm up to 2400 mm.
Pipes and fittings are classified according to nominal pressure. Standard pressure classes are 1 and 4 bar. Intermediate or higher pressure classes are considered on request or depending on the design conditions.
Pipes are also classified according to specific pipe stiffness. Standard stiffness classes are 1250, 2500, 5000 and 10000 Pa. Intermediate or higher stiffness classes are available on request or depending on the design conditions.
Production process of the Centrifugal cast sleeve pipes
Glass fiber, polyester resin and silica sand are used in Superlit Pipes and are produced by Centrifugal Casting method. In this process, which is controlled automatically and electronically, Superlit Pipes are produced by feeding the raw materials into the rotating mould starting from the external surface of the pipes until the determined wall thickness is obtained.
In this pre-programmed and repetitive process the following statistics of the mould are being measured:
- Raw material quantities
- Mould rotation speed
- Pipe formed layer by layer
- Internal temperature values
The production process can be described as follows:
- A feeder arm feeds the raw materials into the mould at the determined quantity.
- The resin that is specially formulated in order not to polymerize during the filling process and the filaments that are cut at the design length are poured into the mould from the head at the end of the feeder arm. The distribution and organization of the filaments within the layers should be conducted so that it would meet the designed circumferential and axial resistance of the pipe.
- The mould initially is rotated at relatively slow speed.
- When feeding of all the raw material is completed, the spinning speed is increased in order to increase the compression force. The increase in the spinning speed ensures the complete compression and enables the passage to the solid materials (curing).
- The wall thickness of the pipe is produced by the linear back and forth movement of the feeding arm within the mould.
- Glass fibers, which are the reinforcing materials, are positioned on both sides of the neutral axis on the pipe wall and the gap in between is filled with silica sand, resin and glass fiber.
- The mechanical properties of SUPERLIT GRP Pipes are adjusted by changing the quantity, proportions and direction of the materials in the pipe layers. This process enables the flexibility of designing pipes to meet a wide range of applications from non-pressure to pressure pipes.
The types of resin used may also be varied in order to meet the requirements of the utilization area and environment, which the pipes may be subjected to.
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