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Chapter 8: Quality Control and Quality Assurance
Source: www.plasticpipe.org
Topic: Quality Control
Sort Desciption: manufactured pipe quality control reports must record the plant date and .... that the manufacturer submit their quality assurance/quality control plan ...
Content Inside: 8 Chapter Lester H. Gabriel Ph.D. P.E. Quality Control and Quality Assurance CHAPTER 8: QUALITY CONTROL AND QUALITY ASSURANCE Control of the quality of the raw material to be used in the production of pipe is the first essential and necessary condition for compliance with the specified requirements of the finished product. HDPE resins used to produce corrugated polyethylene pipe must be sampled tested and approved for use to assure compliance with AASHTO and ASTM cell classification requirements. A resin vendors certification characterizing the material (e.g.; virgin material etc.) and stating compliance with all requirements must accompany all raw material resins used in the manufacture of the pipe. The pipe manufacturers responsibility includes testing randomly selected samples from each lot for verification of density (ASTM D 1505) and melt index (ASTM D 1238) tensile strength (ASTM D 638) and environmental stress crack resistance (ASTM D 1693 ASTM D 5397 or ASTM F 2136). For reference and manufacturing process control purposes accepted material lots should be assigned identifying numbers. Permanent records should be kept. Control of the quality of the pipe manufacturing process is the next essential and necessary condition for compliance. A competent quality control program for manufacturing includes the following: continuous inspection of each step using visual and/or automated inspection procedures testing samples of the finished pipe selected at a predetermined frequency In addition to records of the above items and to insure traceability of the manufactured pipe quality control reports must record the plant date and shift of manufacture production line and resin lot designations. All conforming products must be identified with permanent markings indicating the manufacturer manufacturing plant date of manufacture applicable specification designation and the pipes nominal diameter. A well-designed QA/QC program will include periodic audit ...
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