Supplement for Double-Containment Piping Systems

TRACETEK SUGGESTED SPECIFICATION

MECHANICALELECTRICALSUPPLEMENT

Supplement for Double-Containment Piping Systems

DIVISION 15 - MECHANICAL

Part 1 - General

All supply and return piping shall be of double-wall construction. Installation shall follow manufacturers' and/or prefabricator's instructions. Note: fueling pipe systems shall conform to standard practices such as API Recommended Practice 1615, Fourth Edition, November, 1987 or PEI/RP100-87. Further detail for piping and sensing cable design criteria may be found in the TraceTek Double-Containment Design Guide.

1.1 Containment Design - The pipe design shall allow for a minimum 0.75-inch clearance at the bottom of the pipe throughout the system. The pipe annulus should be designed with sufficient clearance and be free of sharp edges and angles to ensure free movement of the pull rope and sensing cable. Clearance shall take into account the opening under the centralizer; the amount of space at the inside radius at branches, elbows, and sweeps; the size of weld or glue beads and or couplings; and the actual space between the inner and outer pipe dimensions. The pipe annulus shall be designed such that it is sealed from the environment. Note that sumps, valve pits, or vaults that are part of the system shall also meet the sealing requirements.

1.2 Centralizers - Centralizers shall be required to position the primary pipe within the secondary pipe. They shall provide 0.75-inch clearance at the bottom of the pipe to allow free movement of pull rope and sensing cable. Centralizers shall be designed and spaced to withstand loads of the filled pipe and loads due to thermal expansion, be free of sharp edges and shall be bonded to the primary pipe.

1.3 Access Ports - Access ports are required for ease of installation, startup and maintenance of piping and leak detection systems. These ports nominal 4 inches diameter, shall be placed at periodic locations throughout the piping system as specified by drawings.

At the beginning and end of every branch and at the beginning and end of the piping system. Ports shall be positioned at a lateral tee so that the pull rope and sensing cable will be pulled around a 45° turn; not pulled back up the pipe and then down the branch.

If the annular clearance is less than 1 inch; access shall be placed every 180° of accumulated pipe bend. e.g. if elbows are 90°, an access port shall be placed after two elbows. Access shall be placed every 250 feet along straight runs.

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If the annular clearance is 1 inch or greater; access shall be placed every 360° of pipe bends and for every 400 feet of pipe.

For simultaneously joined pipe, access shall be placed every 90° of pipe

bend and for every 100 feet of straight pipe.

There shall be a sensing cable connector located in every access port. (Not every connector requires an access.)

Access ports shall rise up to grade, if underground, and be protected by a 10-inch manhole cover set in concrete of appropriate thickness and width to prevent damage to the piping. The surface shall be one-inch higher and gradually sloped down to surrounding pavement to resist drainage into the manhole.

Part 2 - Products

As specified.

Part 3 - Execution

3.1 General: To ensure that the TraceTek system is installed properly, it is important to coordinate the activities of the various trades involved. The general contractor shall ensure that the pipe installers, mechanical contractors, and electricians schedule their activities according to the installation instructions of the piping and leak detection manufacturers.

3.2 Piping Contractor - The piping contractor shall be responsible to ensure the proper assembly of the pipe to allow for sensing cable installation including:

Align centralizers with no more than 5° variation to allow 0.75-inch clearance at the 6 o'clock position of the pipe during installation.

As the piping is assembled, the contractor shall install continuous, free-running pull ropes.

Pull rope shall be continuous, hollow braid nylon rope (min. 1/4-inch diameter), with 300 pounds minimum pull strength. No substitutions shall be acceptable. Pull rope may be purchased from Raychem Corporation.

The pull rope shall be continuous and knot-free from access port to access port. In individual pipe sections, short length of "lead wire" may be used only as an installation aid to draw the continuous knot-free rope through the pipe.

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The pull rope shall extend at least one-foot out of each access port and be secured to the pipe until the sending cable is pulled through.

Pull ropes shall not be glued down, wrapped around, tied to the inner piping or in any way obstructed from free movement within the annular space. The position the pull rope on the primary pipe and/or centralizer (to keep it clear of adhesives and pinching), nothing stronger than masking tape shall be used.

The primary carrier pipe must be pressure tested for leaks prior to assembling the secondary containment coupling.

The secondary containment shall be completely assembled, welded and/or glued and tested for leaks and all connections soap tested before the sensing cable is installed.

The contractor shall take precautions to ensure the annular space is clean and day when the piping system is complete. All fluid, mud, and debris shall be removed as the pipe is assembled. The annulus shall be protected from moisture and contamination during piping assembly, and shall be sealed after assembly is complete. The annular shall be purged of fluid after piping assembly and tightness testing.

The contractor shall supply "as built" drawings to electrical contractor or distributor for system map.

The contractor shall not bury the pipe before the sensing cables are installed.

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DIVISION 16 - ELECTRICAL

3.3 Electrical Contractor - The electrical contractor is responsible for installing the TraceTek components according with the manufacturer's instructions. The contractor shall:

• Mount and power the alarm module on standard 15 amp 115 VAC dedicated circuit.

• Install conduit from the alarm module location to the entry of the piping system to connect jumper cable to sensing cable.

• Install a TraceTek feed through or other sealed penetration into the annular space.

• Install the TraceTek sensing cable after the piping has been cleaned, dried, and tested

for tightness.

• Select cable lengths allowing for risers and slack to allow a connector at every access port.

• Pull the sensing cable in from access to access using specified pull-ropes.

• Install all components including weighted lengths, modular branching connectors, and end terminators as specified in design drawings.

• The annulus shall be sealed after the sending cable is installed.

• Mark "the as built" drawings of the pipe to indicate the location of sensing cable lengths and supply to the distributor.

3.4 Distributor or Approved Alternate - The distributor shall provide a graphic map of the system from "as built" drawings provided by piping contractor, which shall be mounted near the alarm module. The map shall indicate access ports and footage readings at periodic locations along the system.