**CONSTRUCTION SPECIFICATION**

**AR-52 STEEL PIPELINE**

**1. Scope**

> The work shall consist of furnishing and installing steel pipe
> complete with lining, coating, fittings, and appurtenances.

**2. Material**

> Except as otherwise specified, steel pipe and fittings shall conform
> to Material Specification 554.
>
> Unless otherwise specified, all special fittings and appurtenances
> shall be of the same material as the pipe.

**3. Handling Pipe**

> Pipe shall be stored and handled by methods that will protect the pipe
> and coating from damage.

**4. Placement of Buried Pipelines**

> Pipe shall be installed to the lines and grades shown on the drawings.
> The pipe shall be firmly and uniformly bedded to the depth and in the
> manner specified on the drawings. An ample bell hole working area may
> be left at pipe joints to perform welding, coating, and other related
> activities. The bell hole area shall be bedded as specified before
> backfill operations.
>
> Where trenches are excavated in rock or other hard material that might
> damage the pipe or coating, trenches shall be excavated at least three
> inches deeper than line and grade and backfilled to grade with sand or
> fine earth. At least three inches of soil or sand shall separate pipe
> from objectionable material.
>
> Backfill shall be placed to final grades (including mounding for
> settlement) shown on the drawings. Backfill within two feet of the
> pipe shall be free of debris, rocks, or other objects three inches
> nominal diameter or larger. Final backfill shall be placed in
> approximately uniform, void free, compacted layers.

**5. Above Ground Pipelines**

> Above ground supports and pipelines shall be constructed to the lines
> and grades and as shown on the drawings.

**6. Joints and Connections**

> Pipe joints shall conform to the details shown on the drawings and
> shall be sound and watertight at specified pressures. Gasket joints
> and other high pipe-to-pipe electrical resistance joints shall be
> electrically bridged with a welded, brazed, or soldered copper wire
> not smaller than #6 AWG.
>
> **Welded joints** shall conform to the welding procedures and
> requirements of AWWA Standard C206. Field welding shall avoid burning
> pipe coatings except in the immediate vicinity of the weld. Welded
> field joints shall be single welded butt joints or lap welded slip
> joints as shown on the drawings.
>
> **Bell and spigot joint** dimensions and installed seating shall
> conform to manufacturer\'s recommendations. The pipe shall be laid
> with the bell end upstream. Installed and seated gaskets must be in
> their annular recess and must provide a positive seal. Installed
> joints with \"fish-mouthed\" gaskets must be taken apart and reseated
> with a new gasket. Rubber gaskets shall meet AWWA C200.
>
> **Mechanical couplings** - Pipe ends shall be free of dents, gouges,
> rust, and scale, and shall be machined to prevent displacing gaskets
> and ensure uniform end separation of the pipes. Gaskets shall be
> continuous rubber rings conforming to dimensions and tolerances
> recommended by the manufacturer. Coupling followers shall be drawn up
> evenly to ensure uniform pressure on the gasket. Grooved and
> shouldered joints shall meet AWWA C606.
>
> **Flanged joints** - All steel ring flanges shall meet AWWA C207.
> Gaskets shall be either 1/16 to 1/8 inch thick neoprene cloth, or 1/16
> inch thick red rubber. Gaskets used between flat flange surfaces shall
> cover the full flange face.
>
> **Fitting and coupling coating** - Except as otherwise specified,
> compression couplings, mechanical couplings, and flanged couplings
> shall be coated with AWWA C203 coal tar enamel coating, or vinyl
> coating as recommended by the manufacturer. All bolts shall be
> stainless steel or low alloy steel and shall be field coated with coal
> tar enamel or vinyl coating after installation.

**7. Field lining, coating, wrapping, and repair**

> Except as otherwise specified, lining and wrapping of field joints or
> connections and repair of wrap or coating damage on pipe, couplings,
> fittings, and appurtenances shall be cleaned and covered with a
> coating equal to that specified for the pipe.

**8. Pressure Testing**

> Underground pipelines shall be tested before backfill has been placed
> over the field joints. Above ground pipelines shall be tested
> (anytime) after they are ready for operation.
>
> Before testing, all specified concrete anchors and thrust blocks shall
> have been in place at least three days, pipe ends shall be plugged,
> and backfill around pipe between joints shall be placed to prevent
> pipe movement.
>
> The pipeline shall be flushed and cleaned, and then slowly filled with
> water, taking care to bleed air and prevent water hammer. When the
> line is full, all valves shall be closed and the line brought up to
> maximum design working pressure for a period of two hours. All joints
> shall then be carefully inspected for leakage. Leaks shall be repaired
> and if necessary, the line shall be retested.
>
> Testing shall demonstrate that all valves, vents, surge chambers, and
> other appurtenances function properly at design conditions.
> Objectionable surge, water hammer, unsteady delivery of water, damage
> to the pipeline, and detrimental discharge from control valves are
> evidence of malfunction.

**9. Cathodic Protection**

When specified, cathodic protection shall be provided and installed as
shown on the drawings.