§ 15.01.745. PVC pipe and tubing.

A.

General requirements. PVC pipe shall either be AWWA C900 or AWWA C909 for pipe four inches through twelve inches. PVC pipe fourteen inches through thirty-six inches shall be AWWA C905 pipe.

Polyethylene tubing used in secondary water services shall be polyethylene CTS (copper tube size) tubing. Polyethylene CTS tubing shall be manufactured in accordance with the standard specification for Polyethylene (PEP plastic tubing as issued by the American Standard for Testing Materials under ASTM D2737 and AWWA C901).

B.

Materials. Pipe for the transmission and distribution of water shall be manufactured in accordance with AWWA C900 (latest revision), "AWWA Standard for Polyvinyl Chloride (PVC) Pressure Pipe, 4-inch through 12-inch, for Water Distribution" or AWWA C909 (latest revision), "AWWA Standard for Moleculary Oriented Polyvinyl Chloride (PVCO) Pressure Pipe, 4-inch through 12-inch, for Water Distribution." The PVC pipe shall have a cast iron pipe equivalent outside diameter. PVC pipe 14 inches and larger shall be manufactured in accordance with AWWA C905 (latest revision), "AWWA Standard for Polyvinyl Chloride (PVC) Water Transmission Pipe, Nominal Diameters 14-inch through 36-inch". All PVC pipe four inches and larger shall be DR 18 with a working pressure of one hundred fifty psi. Pipe smaller than four inches shall be schedule 40 PVC.

All PVC pipe shall be purple in color.

All polyethylene tubing shall be polyethylene PE 3408, SDR 9 - two hundred psi pressure rating, purple in color.

C.

Joints. Joints shall be push or rubber gasket type. Lubrication shall be water soluable, non-toxic, non-objectionable in taste and odor imparted to the water, non-supporting of bacteria growth, and have no deteriorating effect on the PVC pipe or rubber gaskets.

D.

Fittings.

1.

Mechanical Joint Fittings: Mechanical joint fittings shall conform to the provisions of ANSI/AWWA C110/A21.10-82 or C153/A21.53-58.

E.

Locator wire and warning tape. All pipe shall have 14AWG locator wire and metallic tape installed with it. The locator wire and tape shall be installed in the pipeline trench approximately two inches to six inches above the pipe. The locator wire shall be brought up in the valve boxes to permit connecting to when doing line location. The metallic tape shall be purple in color and shall read, "NON-POTABLE WATER."

F.

Pipe installation. All pipe shall be laid as specified in AWWA Standard for "Underground Installation of Polyvinyl Chloride (PVC) Pressure Pipe and Fittings for Water" C-605, except as modified herein and in special conditions approved by the city engineer.

Tees, elbows, crosses, and reducers shall be used for changes in direction and outlets, unless otherwise specified on the approved detail drawings.

Anchors, thrust bolts and thrust blocks shall be placed at valves, elbows, tees, etc., as shown on the approved detail drawings or as directed by the city engineer.

All PVC pipe installation shall proceed on a stable foundation, with joints closely and accurately fitted. Joints shall be clean and dry; and a non-toxic joint lubricant, as recommended by the pipe supplier, shall be applied uniformly to the mating joint and gasket surfaces to facilitate easy, positive joint closure.

All pipe shall be installed with uniform bearing under the full length of the barrel, with suitable excavations being made to receive pipe bells and fittings.

Select bedding material shall be compacted around the pipe to firmly bed the pipe in position. If adjustment of position of a pipe length is required after being laid, it shall be removed and rejoined as for new pipe installation. In addition to the above requirements, all pipe installation shall comply with the specific requirements of the pipe manufacturer.

Each pipe shall be laid true to line and grade and in such a manner as to form a close concentric joint with adjoining pipe and to prevent sudden offsets to the flow line. All joint offsets shall be made as specified in AWWA Standard for "Underground Installation of Polyvinyl Chloride (PVC) Pressure Pipe and Fittings for Water" C-605, except as modified herein and in special conditions approved by the city engineer. As work progresses, the interior of the pipe shall be cleared of dirt and superfluous materials. Where cleaning after laying is difficult because of small pipe size, a suitable swab or drag shall be kept in the pipe and pulled forward past each joint immediately after jointing has set; and pipe shall not be laid when conditions of the trench or weather is unsuitable for such work. At all times when work is in progress, all open ends of the pipe and fittings shall be securely closed to the satisfaction of the City Engineer; so that no water, earth, or other substance will enter the pipe or fittings.

G.

Gravel foundation for pipe used. Wherever the subgrade material does not afford a sufficiently solid foundation to support the pipe, the superimposed load, and where groundwater must be drained, the subgrade shall be excavated to such depth as may be necessary and replaced with crushed rock, gravel or other suitable material as approved by city engineer. All such material shall be compacted into place (Section 15.01.1585).

Gravel for PVC pipe foundations shall be clean gravel with one hundred percent passing a one-and-one-half-inch screen and five percent passing a three-fourths-inch sieve.

H.

Pipe bedding. All pipes shall be protected from lateral displacement and possible damage resulting from impact or unbalanced loading during backfilling operations by being adequately bedded. A groove shall be excavated in the bottom of the trench to receive the bottom quadrant of the pipe. Before preparing the groove, the trench bottom shall be excavated or filled, with approved bedding material, and compacted (Section 15.01.1585) to an elevation sufficiently above the grade of the pipe so that, when completed, the pipe will be true to line and grade. Bell holes and pipe fitting holes shall be excavated so that only the barrel of the pipe and bottom quadrant of the fitting receive bearing from the trench bottom.

Pipe bedding materials placed at any point below the midpoint of the pipe shall be deposited and compacted (Section 15.01.1585) in layers not to exceed eight inches in uncompacted depth. Deposition and compaction of bedding materials shall be done simultaneously and uniformly on both sides of the pipe. Compaction shall be accomplished with hand or mechanical compactors. All bedding materials shall be placed into the trench with hand tools or other approved method in such a manner that they will be scattered alongside the pipe and not dropped or pushed into the trench in compact masses. Bedding materials shall be loose earth, free from lumps, boulders or other debris; and/or sand materials free from roots, sod, or other vegetable matter. All bedding materials shall be approved by the city engineer.

In the event trench materials are not satisfactory for pipe bedding, modified bedding materials will be required. Modified bedding shall consist of placing compacted granular material on each side of and to the level of twelve inches above the top of the pipe,

Modified bedding materials shall be graded as follows: one hundred percent passing a one-inch screen and five percent passing a No. 4 sieve. All modified bedding materials shall be approved by the city engineer.

I.

Cleaning and flushing. The contractor shall take every precaution to remove dirt, grease and all other foreign matter from each length of piping before making connections in the field. After each section of piping is installed, it shall be thoroughly cleaned to remove rocks, dirt, and other foreign matter by washing, sweeping, scraping, or other method that will not harm the lining or pipe.

Water required for flushing shall be furnished by the contractor. All temporary connections for flushing and drainage shall be furnished, installed, and subsequently removed by the contractor.

All open ends of pipes shall be bullheaded or plugged when workmen are not on the job or in the immediate area to prevent rocks or other foreign matter from entering the pipe.

All new water systems or extensions to existing systems shall be thoroughly flushed before being placed in service. Flushing shall be accomplished through hydrants or end-of-the-line blow-off assemblies.

J.

Line and grade. All secondary water lines shall be laid with adequate grade to allow for yearly drainage of the lines, and proper filling and emptying of the system. At locations where line and grade cannot be maintained, appropriate measures will need to be implemented to ensure the proper drainage of the lines: Permanent drains to storm drains or to ditches shall be installed at all low points in the pipeline and air-release stations shall be installed at all high points in the pipeline.

(Ord. No. 2010-11-24, § 2, 11-23-2010)