City of Frisco Engineering Standards

A. Shop drawings of the casing pipe (or carrier pipe for uncased bores) from the manufacturer.
Shop drawings shall include calculations for the design of the casing pipe (or carrier pipe for
uncased bores) by a Licensed Professional Engineer.
B. Provide Certificate of Adequacy of Design of casing and/or carrier pipe.
C. Provide record data of casing insulators including sketches of insulators with material
components and dimensions and proposed locations of insulators.
D. Provide Pressure Grout material and method.
PART 2 – PRODUCTS
2.01 MATERIALS
A. Refer to Public Works Construction Standards, NCTCOG, 4 th Edition, Item 503.2.
B. High Density Polyethylene casing spacers are required unless otherwise specified. Refer to
the City of Frisco Approved Materials List.
C. Steel casing pipe shall be new (or used if approved by the OWNER) and suitable for the
purpose intended and shall have a minimum yield strength of 35,000 psi. Casing shall meet
ASTM A-36, ASTM A-570, ASTM A-135, ASTM A-139, or approved equal.
D. Casing pipe shall be coated with coal tar epoxy (15 mils min.) in accordance with AWWA C-
210. Pipe joints shall be welded in accordance with AWWA C-206. After pipe is welded,
coating shall be repaired.
PART 3 – EXECUTION
3.01 GENERAL
A. Refer to Public Works Construction Standards, NCTCOG, 4 th Edition, Item 503.3.
B. All casing pipe joints shall be watertight with no water entering the casing from any sources
prior to carrier pipe installation.
C. The carrier pipe shall be installed within the casing between the limits indicated on the Plans
to the specified lines and grades, and utilizing methods which include due regard for safety
of workers, adjacent structures and improvements, utilities, and the public.
D. Furnish all necessary equipment, power, water, and utilities for carrier pipe installation,
insulator runner lubricant, grouting, and other associated Work required for the Contractor's
methods of construction.
E. Conduct all operations such that trucks and other vehicles do not interfere with traffic or
create a dust or noise nuisance in the streets and to adjacent properties. Promptly clean up,
remove, and dispose of spoils and slurry spillage and any slurry discharges.
City of Frisco May 2012
Standard Technical Specification Trenchless Utility Installation 330523-2