The fundamental materials from which plastic pipe is made include PVC 12454-B, 12454-C or 14333-D. The American Society for Testing and Materials (ASTM) standard D 1784 - Standard Specification for Rigid PVC Compounds, establishes a classification system for plastic pipes. This ASTM standard institutes a classification system governed by the required material properties of plastic pipes. These requirements define, among other requirements, the tensile strength, impact resistance and base resin requirements for plastic pipes.
General classification considerations
The Plastics Pipe Institute has selected a system of classification that has its origins in the design stress for the material. This is decided by the continuous application of hoop stress to the pipe for 1000,000 hours, which equates to a time period of over eleven years. The American Society for Testing and Materials test for long term creep is used to determine hoop stress. A number of classifications exist for the various materials that are used to manufacture plastic pipe. The foremost designation is PVC2110. This designation has a design stress of 1,000psi. Other classifications include PVC1120, PVC1220 and PVC2120, which all have a design strength of 2000psi. PVC2116 has a design strength of 1600psi and PVC2110 has a design strength of 1000psi.
Specification for Rigid PVC Compounds
The ASTM classification requirements for identifying rigid plastic pipe (standard D 1784), stipulates that the base materials from which the pipe will be manufactured must be in the form of compact powder blends, free-flowing power blends, cubes or granules and should be free of unknown material and be consistent in size. All materials must conform to the pre-determined requirements that include impact resistance, elasticity, deflection temperature and tensile strength. This ASTM specification is valid for all rigid plastic compounds that will be used for the manufacture of plastic piping.
Standard Test Method for Hydrostatic Design Basis for Thermoplastic Pipes
As the ASTM standard D2837 08 institutes a classification system for plastic pipes governed by the required properties of material utilized for their manufacture, this standard is significant. Long-term hydrostatic or pressure-strength is an important characteristic of plastic pipes. Temperatures at which pipe materials are tested is considerably higher than those to which the pipe will be exposed to under normal service conditions. Materials for plastic pipe manufacture will therefore be required to withstand temperatures as high as 212 degrees Fahrenheit.
- Photo Credit large plastic pipes image by Yali Shi from Fotolia.com
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