PPI-BoreAid is an online and computer desktop tool developed for and released by the Plastics Pipe Institute (PPI). These tools are developed to assist industry professionals in the evaluation of PE pipe for installation using a horizontal directional drill (HDD) by completing Handbook of PE Pipe, 2nd Edition Chapter 12 design calculations. PE pipe operation and installation calculations (deflection, unconstrained collapse, compressive wall stress, pull back force, and maximum tensile stress) are performed using a user defined bore path and soil strata. PPI-BoreAid employs the calculation methodology and framework developed in BOREAID™ - a comprehensive HDD design tool. BOREAID™ is capable of performing a full HDD design and deformation analysis using 3D surface topography, complex site stratigraphy, with full control over pipe and soil properties. It also contains as-built plots, the ability to export drill rod-by-rod plans, AutoCad import and export compatibility, a drill fluid estimator, a limiting bore pressure estimator, a project cost estimator and an equipment selector. For more information on BoreAid, visit www.boreaid.com.
PPI-BoreAid desktop computer application is a calculation tool that completes the same calculations as the online web based tool using a limited version of BOREAID™. The desktop computer tool is available, free of charge, by clicking the download button at the top of this page.
Calculation Procedure Assumptions
- The earth pressure coefficient used in the calculations is based upon Stein’s theory.
- The safe pull stress is calculated based upon minimum tensile stress requirements for PE 2406 (PE234373), PE3608 (PE345464), and PE4710 (PE445574) as outlined in ASTM D3350 - 10a Standard Specification for Polyethylene Plastics Pipe and Fittings Materials.
- The operational critical collapse calculation displays the result for a water filled pipe (i.e., pressure pipe) and empty pipe (i.e., conduit, gravity-sewer).
- Operational compressive wall stress and buoyant deflection during installation are not shown.
- ¾ of the maximum calculated tensile stress is used in the installation critical collapse calculation since the maximum depth is typically not encountered past three-quarters of the bore distance.
- Entry and exit elevations are assumed equal and additional loads due to variation in topography are not considered (topography is flat).
- The silo width is assumed equal to the bore diameter for calculation of the arching factor during determination of the earth pressure.
- The 1-hr installation critical collapse pressure includes the drag pressure but the 10-hr calculation does not.
- The installation critical collapse calculations assume a pipe ovality of 3%. The operational critical collapse calculations use the larger of 3% and the earth pressure deflection.
- For bores in lithified rock, the earth pressure and deflection are not calculated but an ovality deflection of 3% is assumed for collapse calculations. The long term safety factor against collapse is calculated using a slurry unit weight of 93.57 pcf.
- These are preliminary calculations only. Qualified professionals should be contracted to consider all aspects of the design for horizontal directional drilling.
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