CONSTRUCTION STANDARD SPECIFICATION

SECTION 02553

[EXTERIOR GAS PIPING SYSTEMS]{.underline}

Page

PART 1 - GENERAL

[[1.01]{.smallcaps} [Summary]{.smallcaps}
2](#__RefHeading___Toc26153939)

[[1.02]{.smallcaps} [Submittals]{.smallcaps}
2](#__RefHeading___Toc26153940)

[[1.03]{.smallcaps} [Quality Assurance]{.smallcaps}
3](#__RefHeading___Toc26153941)

PART 2 - PRODUCTS

[[2.01]{.smallcaps} [Pipe]{.smallcaps} 3](#__RefHeading___Toc26153943)

[[2.02]{.smallcaps} [Pipe Fittings]{.smallcaps}
3](#__RefHeading___Toc26153944)

PART 3 - EXECUTION

[[3.01]{.smallcaps} [Pipe]{.smallcaps} 4](#__RefHeading___Toc26153946)

[[3.02]{.smallcaps} [Joining Of Polyethylene Plastic Pipe]{.smallcaps}
6](#__RefHeading___Toc26153947)

[[3.03]{.smallcaps} [Material Handling And Defects]{.smallcaps}
7](#__RefHeading___Toc26153948)

[3.04 Test Requirements 8](#__RefHeading___Toc26153949)

CONSTRUCTION STANDARD SPECIFICATION

SECTION 02553

[EXTERIOR GAS PIPING SYSTEMS]{.underline}

# [GENERAL]{.underline} {#general .SECTION-1}

1.  []{#__RefHeading___Toc26153939 .anchor}SUMMARY

    A.  This section shall apply to the materials and operations
        required for the installation of underground exterior gas
        distribution systems, including all piping, fittings,
        installation, joints, location devices, service risers, and
        tests.

    B.  Related Sections: Refer to Section 02200, \"Earthwork\" for
        related work.

2.  []{#__RefHeading___Toc26153940 .anchor}SUBMITTALS

    A.  General: Submit the following items in accordance with the
        Conditions of Contract and Section 01330, "Submittal
        Procedures."

    B.  Product Data: Submit product data for the following materials
        and items

        1.  Pipe

        2.  Fittings

        3.  Valves

        4.  Valve boxes

        5.  Test Boxes and markers

        6.  Risers

        7.  Transition fittings.

    C.  Installation Instructions: Submit installation instructions for
        the following materials and items

        1.  Pipe

        2.  Risers

    D.  All welding certifications shall be submitted to the Sandia
        Construction Observer (SCO) for verification of quality
        assurance at least two weeks prior to starting any work. The
        procedures and certifications will be reviewed by Sandia's
        designated certified welding inspector.

3.  []{#__RefHeading___Toc26153941 .anchor}QUALITY ASSURANCE

> The materials and practices comprising the work shall conform to this
> and other referenced standard specifications. Where this specification
> conflicts with the requirements of another referenced specification or
> manufacturer's recommendation, the more stringent shall prevail.

# [PRODUCTS]{.underline} {#products .SECTION-1}

1.  []{#__RefHeading___Toc26153943 .anchor}PIPE

The underground gas distribution system shall be all polyethylene
plastic pipe PE 3406, or PE 3408, SDR 11 IPS, (Performance Pipe CPCC8100
or approved equal) unless otherwise specified on the contract drawings.
The polyethylene plastic pipe used shall conform with the latest
American Society of Testing Materials (ASTM) D2513, publication of
specifications for thermoplastic gas pressure pipe, tubing, fittings and
the following ASTM minimum test requirements (D 1505, D 1238, D 1693, D
638, D 256, D 1525, D 746, D 3350, D 638, D 2240, D 696, D 2837).

2.  []{#__RefHeading___Toc26153944 .anchor}PIPE FITTINGS

    A.  Heat fusion fittings shall conform to ASTM D2513 and be
        installed in accordance with manufacturer\'s recommendations.
        Heat fusion joints shall be allowed only when joining new
        sections of pipe together that are of the same type (ASTM D2513
        PE3408) and size unless approved by the Sandia gas system
        engineer. All other connections shall be electrofusion
        couplings. Electrofusion fittings shall be Kerotest, Central or
        approved equal.

    B.  Mechanical joint fittings shall conform to ASTM D2513 and be
        installed as per manufacturer\'s recommendations.

    C.  Valves shall be full-port polyethylene ball valve SDR 11, high
        density PE3408 body, with 2-inch operating square. Valves shall
        meet the requirements of American National Standards Institute
        (ANSI) B16.40, U.S. Department of Transportation (DOT) Title 49
        Code of Federal Regulations (CFR) Part 192, and ASTM D2513.
        Valves shall be Nordstrom \"Poly-Gas\" valve, Kerotest, or
        approved equal. Where full-port valves are not available from
        the manufacturer, the next larger size valve shall be provided.
        Provide valves with manufacturer's extended stem or fabricate
        valve extension per Sandia National Laboratories (SNL) standard
        detail where valve wrench longer than 18-inches would otherwise
        be required to operate valve. Valves with exposed metal parts
        requiring cathodic protection or which require any maintenance
        or lubrication will not be allowed.

    D.  Valve Boxes: Valve boxes shall be Tyler model 6860, cast iron
        shaft screw type, with lid marked \"GAS\", length to suit burial
        depth. Install per SNL standard detail.

    E.  Test Boxes:

        1.  Flush mount test boxes shall be Handley model T4H5C, 4\"
            diameter, 18-inch long flared plastic body, cast iron lid
            with \"TEST\" cast in cover, heavy duty cast iron flange
            suitable for direct installation in asphalt, 5 terminals,
            vent hole in lid.

        2.  Raised type shall be Cott Manufacturing \"Big Fink\", number
            of terminal leads to suit, yellow polyethylene 3\" diameter
            5-foot long mounting conduit with \"GAS\" written on post.

    F.  Risers shall be R.W. Lyall \"Lyco\" 90 degree Bend Rigid
        **[Anodeless]{.underline}** risers or equal.

    G.  Transition Fittings shall be R.W. Lyall \"Lyco\" with PE 3408
        and ASTM A53 end connections, size and thickness to match
        connecting pipe sizes.

# [EXECUTION]{.underline} {#execution .SECTION-1}

1.  []{#__RefHeading___Toc26153946 .anchor}PIPE

    A.  General Installation

        1.  Do not install gas lines under buildings, structures, or in
            crawl spaces.

        2.  Install a schedule 40 steel sleeve on all risers passing
            through asphalt or concrete slabs. Allow at least 1" of
            radial clearance between sleeve and riser. Fill void with
            pea gravel.

        3.  Burial Depth: Buried plastic piping shall be buried a
            minimum depth of 24 inches unless noted otherwise.

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    A.  Trenching

        1.  Trench width: Width shall be wide enough to provide at least
            6 inches clearance on both sides of the pipe. Trench width
            shall not exceed outside diameter of pipe plus 24 inches to
            an elevation 12 inches above the top of pipe.

        2.  Trench bottoms: Excavate and shape trench bottoms to provide
            uniform bearing and support of pipes. Shape subgrade to
            provide continuous support for bells, joints, and barrels of
            pipes and for joints, fittings, and bodies of conduits.
            Remove projecting stones and sharp objects along the trench
            sub grade.

    B.  Plastic pipe shall not be subjected to unnecessary strains such
        as bending or twisting at any time and shall be handled with
        care as it is lowered into the ditch. The pipe shall be laid on
        the ditch bottom in such a manner as to snake the pipe from one
        side of the ditch to the other with one cycle approximately
        every 40 feet. The pipe shall be laid and continuously supported
        on undisturbed or well-compacted soil.

        1.  Underground Clearance: Each distribution line shall be
            installed with at least 12\" of radial clearance from any
            other underground structure not associated with the
            distribution line. SDR approval is necessary should this
            dimension requirement not be attainable. In addition, all
            plastic pipe and plastic service lines shall be installed
            with sufficient clearance, or shall be insulated, from any
            source of heat so as to prevent the heat from impairing the
            serviceability of the pipe.

        2.  Bends: The pipe may be bent or deflected no more than to the
            minimum radius recommended by the manufacturer. Bends shall
            be free of buckles, cracks, or other evidence of damage.
            Changes in direction, which cannot be made by bends, shall
            be made with elbow or tee fittings. Elbow or tee fittings
            shall not be trimmed to fit. Miter joints are not permitted.

        3.  Obstructions in the Pipe: The open ends of the pipeline
            shall be closed at all times, and shall not be reopened
            until such time as the next joint of pipe is to be
            connected. This closure shall be capable of preventing the
            entrance of small animals or the introduction of foreign
            material (water included) of any nature into the line.

            a.  After the pipe has been strung along the right-of-way,
                each length shall be swabbed prior to welding it into
                the pipeline. The swab shall be a soft cloth. Each
                length shall be visually inspected internally prior to
                use.

            b.  Care shall be exercised when joining the sections of
                pipe to minimize the possibilities of any foreign
                material being in the line after its completion. The
                Contractor shall remove any obstructions in the pipeline
                caused by foreign material.

            c.  After the pipeline or measured portions is complete, the
                Contractor shall run a polyurethane pipeline pig through
                the line (2X) to displace any foreign material
                introduced during construction. Prior to the pigging
                operations, a "pig catcher" shall be installed to the
                end of the pipeline to prevent an uncontrolled release
                during pressurization. The pig shall be moved by air
                pressure only. The use of gas pressure in the pigging
                operation is prohibited.

    C.  Backfill: In warm weather, backfilling shall be performed during
        the coolest part of the day whenever possible. Backfill material
        shall be soft dirt or sand free of stones or debris that may cut
        or otherwise damage the pipe. Clean backfill material shall
        surround the pipe for at least 4\" or one pipe diameter
        (whichever is greater) in all directions. Backfill shall be
        placed level from one wall of the ditch to the other and shall
        not be mounded over the pipe.

        1.  Place backfill with a maximum of 8" lifts and perform
            tamping with the proper equipment. The pipe shall not be
            damaged during compaction. When flooding of the ditch is
            used to consolidate backfill, the pipe shall not be allowed
            to float from its bearing on the ditch bottom. Compaction
            with heavy equipment is not permitted unless the pipe has
            24\" of cover and the pipe internal pressure exceeds 15
            psig.

    D.  Location Device: Install an electrically conductive 12 gauge
        copper wire with yellow insulation. The tracer wire shall be
        installed at a distance of four to six inches adjacent to the
        pipe. The wire and all of its connections shall be insulated to
        prevent corrosion. The wire and locating tape shall be installed
        as shown on the "Warning Tape and Tracer Wire Detail" drawing
        detail. The detectable warning tape shall have a foil core and
        shall be reinforced consisting of 5 mil total thickness.

    E.  Tie-in to Other Lines: After lowering the pipe into the ditch
        and prior to joining installed sections or making tie-ins to
        other lines, sufficient time shall be allowed for contraction as
        the pipe assumes ground temperature. Tie-ins to existing lines
        shall be performed in an atmosphere absent of gas. Tie-ins or
        connections to all existing lines shall be made using the
        appropriate electrofusion couplings. Hot tie-ins shall be
        permitted only when using electrofusion-tapping tee after
        providing documentation of procedures to be used and obtaining
        written authorization from Sandia Construction Observer (SCO).
        Procedure shall be performed in the presence of SNL Utilities
        Maintenance personnel.

    F.  Pipe Squeeze-Off: Shall be permitted only using squeeze tool
        meeting ASTM F1563 and following procedures meeting ASTM F1041.
        Contractor shall be allowed only to perform squeeze-off
        operation after providing documentation of procedures to be used
        and obtaining written authorization from SCO. This action may
        not be performed more than once at the same point on the pipe.
        Procedure shall be performed in the presence of SNL Utilities
        Maintenance personnel.

    G.  Static Discharge Protection: Whenever performing work on or near
        gas lines that could potentially contain combustible gas
        contractor shall evaluate potential for static discharge. Work
        shall be permitted only after providing documentation of
        procedures to be used and obtaining written authorization from
        SCO. Procedure shall be performed in the presence of SNL
        Utilities Maintenance personnel.

2.  []{#__RefHeading___Toc26153947 .anchor}JOINING OF POLYETHYLENE
    PLASTIC PIPE

    A.  General: The Contractor\'s personnel who perform heat-fusion
        joining on distribution facilities shall be qualified by the
        pipe manufacturer\'s qualifying representative prior to starting
        any work. The Contractor may, at his option, submit a list of
        previously qualified candidates to the Sandia Construction
        Observer (SCO) in lieu of retesting. The list shall include the
        date of qualification, and the name of the qualifying
        representative that was present for the test.

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    A.  No heat-fusion joining shall be performed when the quality of
        the joining may be adversely affected by weather conditions.
        Rain, blowing sand, windstorms, and other inclement weather
        shall be cause for the SCO to cease welding operations.
        Windshields may be used during windy weather if approved by the
        SCO.

    B.  Heat-Fusion Joints: Heat the mating surfaces to their fusion
        temperature, compress the mating surfaces together, and hold the
        mating surfaces together until the joint cools naturally. Direct
        application of heat using a torch or other open flame is
        prohibited.

    C.  Equipment and tools, which are manufactured specifically for the
        fusion process, shall be used. The equipment shall be designed
        to hold the heating element firmly against and parallel to the
        mating surfaces, compress the heated surfaces together and hold
        the surfaces firmly together in alignment until the joint cools
        naturally. The heating elements shall be electric type, which
        are thermostatically controlled. The heating tools shall be
        capable of maintaining uniform surface temperature within the
        melt-temperature range specified by the material manufacturer. A
        crayon temperature indicator shall be used by the Contractor to
        verify that the heating element temperature is correct prior to
        making each joint. The temperature crayon mark shall not be
        applied to the part of the heater face that comes in direct
        contact with the pipe.

    D.  Marking of Joints: Each person performing heat-fusion joining on
        a pipeline shall have a distinctive mark which shall be placed
        on the pipe with a felt-tip pen near each heat-fusion joint
        completed. The mark shall be that appearing on the welder\'s
        certification card. The color of the pen shall be such that the
        mark is distinguishable from the color of the pipe.

    E.  At any time during the assembly process, the SCO may request
        that a joint be tested by non-destructive or destructive
        methods.

3.  []{#__RefHeading___Toc26153948 .anchor}MATERIAL HANDLING AND DEFECTS

    A.  When loading or unloading plastic pipe, the pipe shall be placed
        into the desired position without damage. The pipe shall not be
        allowed to drop freely from the truck bed to the ground. The
        pipe shall be strung onto terrain free from rocks or other
        projections, which might cause damage to the pipe. The pipe
        shall not be dragged over rocks or other abrasive material.

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    A.  Plastic pipe shall be protected from fire, excessive heat, or
        harmful chemicals. Cleaning solutions, detergents, solvents,
        alcohols, etc., shall not be allowed to contact the pipe.

    B.  Inspection of Materials: The Contractor shall visually inspect
        each length of pipe and all components, both inside and out, at
        the site of installation to insure that it has not sustained
        damage that could impair its serviceability. A second surface
        inspection shall be made immediately prior to lowering the pipe
        into the ditch.

    C.  Damage, Defects, and Repairs: Any pipe which has cuts gouges,
        scratches, or punctures greater than 10 percent of the pipe wall
        thickness, or other damage or defects that would impair the
        serviceability of the pipe, shall be repaired by removal of the
        defective section and replacement by a new section of pipe.

4.  []{#__RefHeading___Toc26153949 .anchor}TEST REQUIREMENTS

    A.  The Contractor, in accordance with the following procedure,
        shall test all new segments of line. The SCO shall be notified
        prior to the start of each test.

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    A.  Test Procedure:

        a.  Dry air shall be the test media. The air used in testing
            shall be free of contaminants.

        b.  The temperature of the plastic material shall not exceed 100
            deg F due to the temperature of the compressed air or any
            other source.

        c.  The minimum test pressure shall be 1.5 times the maximum
            operating pressure or 60 psig whichever is greater. (Typical
            distribution pressure at SNL NM is 20 psig, so required test
            pressure for distribution system is typically 60 psig.)

        d.  Tie-in joints, which are not included in the test, shall be
            soap-tested at the operating pressure. After the soap test,
            all of the soap shall be removed from the pipe by a thorough
            washing with water.

        e.  Due to the possibility of static electric discharge,
            polyethylene pipe or other plastic tubing shall not be used
            as vent lines in testing or purging operations.

    B.  Test Duration: The pressure shall be maintained at or above the
        minimum test pressure for the periods shown in the following
        tables. Time shall begin when the pressure in the system has
        stabilized. Any leakage in the line shall be cause for failure
        of the test. If the test is failed, the Contractor shall repair
        the defective line and retest at no additional cost to Sandia
        National Laboratories (SNL).

[3\" Pipe or Less]{.underline}

[Length]{.underline} [Time in Hours]{.underline}

100 feet or less 1

101 feet to 500 feet 2

501 feet to 2,000 feet 3

2,001 feet to 10,000 feet 4

Over 10,000 feet 12

[4\" Pipe or Greater]{.underline}

[Length]{.underline} [Time in Hours]{.underline}

100 feet or less 1

101 feet to 500 feet 2

501 feet to 2,000 feet 3

2,001 feet to 10,000 feet 12

Over 10,000 feet 16

C.  Compensation for change in temperature: The temperature shall be
    monitored throughout the test duration. Losses due to change in
    temperature shall be calculated with the following equation:

> Corrected Ending Pressure (psia) = Measured Ending Pressure (psia)
>
> x [Starting Temperature (F) + 460]{.underline}
>
> Ending Temperature (F) + 460
>
> Absolute pressure (psia) = Gauge Pressure (psig) + 12.2

D.  Pressure Gauges: For test pressures of 10 psig or less, gauge shall
    have increments of 1/10^th^ psi or less, for pressures greater than
    10 psig gauges shall have increments of one psi or less. The maximum
    scale on the gauge shall be no more than twice the test pressure
    applied.

E.  Safety During Test: Every reasonable precaution shall be taken to
    protect workers and the general public during testing. No direct
    connections will be permitted from the new line to any existing gas
    lines unless they are physically separated. Suitable steps shall be
    taken to keep persons not involved in the test procedure out of the
    testing area during the test.

F.  Test Records: The attached "Exterior Gas Piping System Test Record"
    shall be prepared as part of the test procedure. The completed form
    shall be submitted to the SCO for final approval.

    \- END OF SECTION -

![](media/image1.png){width="1.74375in" height="0.26180555555555557in"}

> Facilities Management &
>
> Operations Center

# Exterior Gas Piping System Test Record {#exterior-gas-piping-system-test-record .ATTACHMENT}

<table style="width:100%;">
<colgroup>
<col style="width: 6%" />
<col style="width: 14%" />
<col style="width: 1%" />
<col style="width: 5%" />
<col style="width: 5%" />
<col style="width: 5%" />
<col style="width: 1%" />
<col style="width: 17%" />
<col style="width: 3%" />
<col style="width: 1%" />
<col style="width: 8%" />
<col style="width: 1%" />
<col style="width: 1%" />
<col style="width: 2%" />
<col style="width: 0%" />
<col style="width: 15%" />
<col style="width: 6%" />
</colgroup>
<tbody>
<tr class="odd">
<td><img src="media/image2.wmf"
style="width:0.24722in;height:0.20556in" /></td>
<td colspan="16">Check off boxes as you complete each line.</td>
</tr>
<tr class="even">
<td colspan="17"></td>
</tr>
<tr class="odd">
<td></td>
<td>Project No.:</td>
<td colspan="5">     </td>
<td>Project Title:</td>
<td colspan="9">     </td>
</tr>
<tr class="even">
<td colspan="17"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3">Test conducted by:</td>
<td colspan="2">Name:</td>
<td colspan="11">     </td>
</tr>
<tr class="even">
<td></td>
<td colspan="2"></td>
<td colspan="3">Company:</td>
<td colspan="11">     </td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5">SNL Mechanical Inspector:</td>
<td colspan="11">     </td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="16">Attached qualifications of individual conducting
test.</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4">Pipe size:</td>
<td colspan="2"></td>
<td colspan="3">3” pipe or less</td>
<td colspan="2"></td>
<td colspan="3"></td>
<td colspan="2">4” pipe or greater</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">Total length of pipe:</td>
<td colspan="11">     </td>
<td>feet</td>
</tr>
<tr class="even">
<td colspan="17"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">Test duration required:</td>
<td colspan="12">     </td>
</tr>
<tr class="even">
<td colspan="17"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">Test duration used:</td>
<td colspan="12">     </td>
</tr>
<tr class="even">
<td colspan="17"></td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">Maximum operating pressure:</td>
<td colspan="5">     </td>
<td>psig</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">1.5 times maximum operating pressure =</td>
<td colspan="5">     </td>
<td>psig</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">Required test pressure = greater of 60 psig or 1.5 x
MOP =</td>
<td colspan="5">     </td>
<td>psig</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">Temperature at start of test:</td>
<td colspan="5">     </td>
<td>(°F)</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">Test pressure at start of test:</td>
<td colspan="5">     </td>
<td>psig</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">Temperature at end of test:</td>
<td colspan="5">     </td>
<td>(°F)</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">Test pressure at end of test:</td>
<td colspan="5">     </td>
<td>psig</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">+12.2=</td>
<td colspan="5">     </td>
<td>psia</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10"><p>Temperature correction factor = <sub><u>starting
temperature (F) + 460</u></sub> <sub>=</sub></p>
<p><sup>ending temperature (F) + 460</sup></p></td>
<td colspan="5">     </td>
<td></td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10"><p>Corrected pressure at end of test =</p>
<p>pressure at end of test (psia) x temperature correction factor
=</p></td>
<td colspan="5">     </td>
<td>psia</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="10">-12.2 =</td>
<td colspan="5">     </td>
<td>psig</td>
</tr>
<tr class="odd">
<td colspan="17"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="8">Any leaks / failures noted and disposition if any:</td>
<td colspan="8"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="16">     </td>
</tr>
<tr class="even">
<td></td>
<td colspan="16"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="16"><h1 id="section"
class="SECTION-1 unnumbered"></h1></td>
</tr>
<tr class="even">
<td></td>
<td colspan="16"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="12"></td>
<td></td>
<td colspan="3"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="12">SCO Signature</td>
<td></td>
<td colspan="3">Date</td>
</tr>
</tbody>
</table>