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Volume 2: Technical Reference on Squeeze-Off of...

SKU: GRI-92/0147.2
Volume 2: Technical Reference on Squeeze-Off of Polyethylene Gas Pipes

This volume provides detailed description of experiments, analysis, test data, and conclusions. Squeeze-offs are performed on polyethylene gas pipes to stop gas flow when downstream repairs are needed. Occasionally damage is initiated and later failure occurs by a slow crack growth mechanism. To prevent this, it is necessary to know which conditions induce damage, how to identify materials susceptible to damage, what guidelines exist for good squeeze-off procedures, and which tool designs can avoid or minimize damage.
Document Type
Report
Report Type
Topical Report
Report Period
08/89 - 10/92
Corporate Source
Battelle Memorial Institute, Columbus, OH
Sponsor
Gas Research Institute, Chicago, IL
Pagination
91p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
Squeeze-offs are performed on polyethylene gas pipes to stop gas flow when downstream repairs are needed. Occasionally damage is initiated and later failure occurs by a slow crack growth mechanism. To prevent this, it is necessary to know which conditions induce damage, how to identify materials susceptible to damage, what guidelines exist for good squeeze-off procedures, and which tool designs can avoid or minimize damage. A combination of squeeze-off experiments, damage assessment, and phenomenological modeling was performed. In many tests the parameters such as pipe material, tool size and geometry, wall thickness, and pipe diameter, were repeatedly varied. After the pipe was released it was examined for signs of damage in the proximity of the squeeze ears. The phenomenological model indicated that the damage could begin below surface, hence the assessment included a sub-surface examination. In some cases sub-surface voids were found to confirm the hypothesis. The results show that immediate damage occurs during the first part of release if wall compression is extreme. The growth rate of the damage depends on the slow-crack-growth resistivity of the materials. If immediate damage does not occur, it is unlikely to develop later. This volume provides detailed description of experiments, analysis, test data, and conclusions.
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