PART 3
EXECUTION
3.1
LOCATION OF GAS LINES
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NOTE: Where appropriate (under a subparagraph to be
entitled "Pipe Anchorage"), special requirements
such as use of concrete coating to provide negative
buoyancy in areas of flooding or tie rods attached
to anchors in areas of erosion or unstable soils,
should be written into the specifications for the
project.
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Do not install gas piping in the same trench with other utilities. The
minimum horizontal clearance between gas pipe and parallel utility pipe
shall be 610 mm 2 feet. Do not install gas pipe through catch basins,
vaults, manholes or similar underground structures.
3.2
VERIFICATION OF CONDITIONS
Pipe, fittings, valves and accessories will be carefully inspected by the
Contracting Officer or the Contracting Officer's authorized representative
before and after installation and those found defective will be rejected.
Pipe and fittings shall be free from fins and burrs. Before being placed
in position, clean pipe, fittings, valves, and accessories and maintain in
a clean condition.
3.3
INSTALLATION OF PIPELINES
3.3.1
Pipe Laying and Jointing
Provide proper facilities for lowering sections of pipe into trenches. Cut
pipe accurately to measurements established at the site and work into place
without springing or forcing. Replace pipe or fittings that do not allow
sufficient space for proper installation of jointing material with pipe or
fittings of proper dimensions. Grade pipe in straight lines, taking care
to avoid the formation of dips and low points. Support pipe at proper
elevation and grade, taking care to secure firm and uniform support. Wood
support blocking will not be permitted. The full length of each section of
pipe and all fittings shall rest solidly on the pipe bed, with recesses
excavated to accommodate joints and couplings. Provide anchors and
supports where indicated. Make provision for the expansion and contraction
of pipe lines as indicated. Keep trenches free of water until joints have
been made. Close open ends of pipe temporarily with wood blocks or plastic
end closures at the end of each work day. Gas mains shall have a minimum
earth cover of 760 mm 30 inches, except that in rock excavation, minimum
earth cover shall be 610 mm 24 inches.
3.3.2
Buried Warning and Identification Tape
Provide color, type and depth of tape as specified in paragraphs "Buried
Warning and Identification Tape" in Section 02300 EXCAVATION.
3.3.3
Connections to Existing Pipelines
When it is necessary to make connections to live gas mains, use pressure
tight installation equipment. Connections shall be made in accordance with
SECTION 02551N
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