ASME B31.8.
3.3.4
Installation Beneath Railroad Right-of-Way
Where pipeline passes under the right-of-way of a commercial railroad,
installation shall be in accordance with recommendations of the railroad.
3.3.5
Installation of Valves for Gas Mains
**************************************************************************
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.
**************************************************************************
Install valves in accordance with applicable installation requirements
specified in ASME B31.8 and as indicated. Install valve stems on buried
piping vertically with a minimum of 200 mm 8 inchesclearance from stem top
to finished grade. Valves installed in [RTR] [PE] piping shall be
restrained as indicated so that no turning torque is transmitted to the
pipe.
3.3.6
Special Requirements for Steel Gas Main Piping Installation
Install pipelines as specified herein and in accordance with the applicable
requirements of ASME B31.8.
3.3.6.1
Earthwork for Steel Gas Main Piping
Earthwork shall be in accordance with Section 02300 EXCAVATION. Employ
hand excavation within 1500 mm 5 feet of existing gas pipelines or other
underground structures. Do not damage pipe coating during earthwork
operations.
3.3.6.2
Steel Gas Main Piping Joints
Weld joints unless otherwise [specified] [or] [indicated]. Make welded
joints in accordance with ASME B31.8 and API Std 1104. Welders
qualifications, welding procedures and weld examinations shall be in
accordance with API Std 1104. Insulating joints installed underground
shall be accessible. [Make flanged joints up tight, taking care to avoid
undue strain on valves, fittings, and other accessories. Align bolt holes
for each flanged joint. Install full-size bolts for bolt holes;
installation of undersized bolts to make up for misalignment of bolt holes
or for other purposes will not be permitted. Adjoining flange faces shall
not be out of parallel to such degree that flanged joint cannot be made
gas-tight without overstraining the flange. Faces of flanges and bolt and
nut bearing areas shall be clean and smooth. Replace flanged pipe or
fittings whose dimensions do not allow for making a proper flanged joint as
specified herein with one of proper dimensions.] [Make up joints between
ferrous and nonferrous metallic piping with insulating fittings.] [Threaded
joints shall have tapered threads, evenly cut, and be made with
Underwriter's Laboratories approved graphite compound for gas service or
with polytetrafluoroethylene tape conforming to MIL-T-27730, applied to the
male threads only. After cutting and before threading, ream pipe and
remove burrs. Calking of threaded joints to stop or prevent leaks will not
be permitted.]
SECTION 02551N
Page 18
Previous Page
