applicable requirements of ASTM D 2774.] Minimum earth cover for service
lines shall be 610 mm 24 inches in streets or roads and 305 mm 12 inches in
private property. Install an electrically conductive No. 10 gage wire with
buried PE pipe or tubing to facilitate location with an electronic
detector. Install wire 150 to 205 mm 6 to 8 inches above service line and
terminate 76 to 102 mm 3 to 4 inches above grade. Do not wrap wire around
pipe.
3.3.8.1
Earthwork for Gas Service Piping
Earthwork shall be in accordance with Section 02300 EXCAVATION [, and for
PE pipe or tubing the applicable requirements of ASTM D 2774]. Employ hand
excavation within 1500 mm 5 feet of existing gas pipelines or other
underground structures. [PE tubing may also be laid by the plow-in
technique. The plow-in technique of laying tubing shall be accomplished by
approved equipment especially designed for this type of work. The
equipment shall have a vibratory plow, feed chute, soft rubber tubing
cushion guide, and a tubing reel. The vibratory plow shall be capable of
cutting a slit in the ground of width consistent with the size of the
tubing and of depth to have the specified depth of cover over the tubing
when laid. The unit shall be capable of feeding the tubing and the warning
tape into the ground to the specified depth, without kinking. The reel
shall be of a diameter appropriate for the tubing and shall operate
smoothly. In the event the tubing breaks or kinks, the kink shall be cut
out and a joint as herein specified for the material shall be made.]
3.3.8.2
Service Connections
Make service connections at the top of the main, whenever the depth of the
main is sufficient to allow top connections. When service connections
cannot be made at the top of the main, they shall be made on the side of
the main as close to the top as possible. Service connections shall not be
made lower than the horizontal midpoint of the gas main. Install service
connections in accordance with the applicable requirements of ASME B31.8.
3.3.8.3
Gas Service Piping Joints
a.
Steel Pipe: Make joints for steel service line piping as
specified for steel distribution main piping.
b.
PE Pipe or Tubing: Make joints for PE pipe or tubing and fittings
in accordance with ASME B31.8 and the recommendations of the
manufacturer of the pipe or tubing and fittings.
3.3.8.4
Valve Installation on PE Service Lines
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NOTE: When valves are to be installed in RTR or PE
pipe or tubing, the project drawings shall include a
detail showing the anchors to be installed and the
technique to be used to ensure that no turning
torque is imposed on the pipe.
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Restrain curb cocks installed on PE service lines as indicated so that no
turning torque can be transmitted to the pipe. Support curb boxes as
indicated.
SECTION 02551N
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