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Guidelines and Technical Reference on Gas Flow...

SKU: GRI-94/0205
Guidelines and Technical Reference on Gas Flow Shut-Off in Polyethylene Pipes Using Squeeze Tools

The objective of this investigation was to develop field-usable guidelines to safely and effectively stop the flow of gas using squeeze tools, without inducing damage, under various conditions, and for different PE gas pipe materials, pipe sizes, and squeeze parameters. Based on current practice, three medium density PE materials and one high density PE material were evaluated for different diameters, wall thicknesses, and squeeze tool geometries and sizes.
Document Type
Report
Report Type
Topical Report
Report Period
01/92 - 06/94
Corporate Source
Battelle Memorial Institute, Columbus, OH
Sponsor
Gas Research Institute, Chicago, IL
Pagination
72p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
Squeeze-off is a procedure to stop gas flow in polyethylene (PE) gas distribution pipes for repairs or maintenance downstream of the squeeze-off point. During the squeeze-off, the pipe undergoes a change in shape, and deformation of the pipe wall. The objective of this investigation was to develop field-usable guidelines to safely and effectively stop the flow of gas using squeeze tools, without inducing damage, under various conditions, and for different PE gas pipe materials, pipe sizes, and squeeze parameters. Based on current practice, three medium density PE materials and one high density PE material were evaluated for different diameters, wall thicknesses, and squeeze tool geometries and sizes. The test setup consisted of the pipe to be squeezed, with a source of adjustable, constant pressure upstream, and flow meters downstream. Trends were determined as a function of pipe diameter, wall thickness, squeeze bar geometry, and squeeze bar size. The analyses were used to develop guidelines for field practice, and to suggest modified squeeze bar shapes which may provide better squeeze-off performance. Appendixes include test measurements and tabular and graphical data.
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