Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2007-09-11
2007-09-11
Tsai, Carol S. W. (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
Reexamination Certificate
active
11005306
ABSTRACT:
Disclosed is a method that provides for the calculation and prediction of hoop strength of an expanded pipe, preferably a PVC pipe or conduit. The method includes the steps of: (a) determining hoop strength as a function of relative wall thickness; (b) determining Wall Thickness Ratio (WTR) by dividing a nominal wall thickness of the original conduit by the minimum wall thickness of the expanded conduit; (c) determining long-term hydrostatic strength by at least one of hoop testing and burst testing; and (d) applying an accelerated regression analysis to the results in step (c), yielding a Hydrostatic Design Basis (HDB). The resulting HDB may be plotted against WTR to provide the user with graphical data for use in making design decisions and choosing specific conduit for specific applications.
REFERENCES:
patent: 2005/0033415 (2005-02-01), Pelton
American Water Works Association ANSI/AWWA C900-97 (Revision of ANSI/AWWA C900-89) AWWA Standard for Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4 in. Through 12 in. (100 mm Through 300 mm), For Water Distribution, Feb. 1, 1998.
American Water Works Association ANSI/AWWA C905-97 (Revision of ANSI/AWWA C905-88) AWWA Standard for Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 14, in. Through 48 in. (350 mm Through 1,200 mm), For Water Transmission and Distribution, Feb. 1, 1998.
NSF/ANSI 61-2003e “Drinking water system components -Health effects”; NSF International Standard/American National Standard, Sep. 3, 2003.
“Standard Specification for Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)1” ASTM Designation: D 2241-00 (pp. 83-91), Sep. 2000.
“Standard Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe by Split Disk Method1” ASTM Designation: D 2290-00 (pp. 99-103), Sep. 2000.
“Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Platic Pipe, Tubing, and Fittings1” ASTM Designation: D 1599-99 (pp. 28-30), Mar. 2000.
“Standard Specification for Oriented Poly(Vinyl Chloride), PVCO, Pressure Pipe” ASTM Designation: D 14832-98 (pp. 11751179), Mar. 1999.
Ferry Steven R.
Marti Thomas
Woods David W.
Sun Xiuqin
The Webb Law Firm
Tsai Carol S. W.
Underground Solutions Technologies Group, Inc.
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