November 25, 2017

Division Two - Standards for Water Systems - Chapter III. Water Pipe

Chapter III. Water Pipe

Sec. 203-1 Pipe Pressure

Water distribution systems shall be designed to maintain normal operating pressures of not less than 25 PSIG at the service connection, except that during periods of fire flow plus one-half (½) of the peak hourly residential flow as defined in Section 202-3.02, the pressure may be reduced to not less than 20 PSIG. During periods of hourly minimum demand or no flow, the water system pressure may not be more than 150 PSIG.

Variations in pressures under normal operations shall not exceed 50% of the average operating pressure. Computations shall be submitted to demonstrate that these maximum and minimum pressures will be met. Class 150 pipe shall be the minimum pressure pipe used.

Sec. 203-2 Pipe Diameter

All diameters shall be full nominal inside diameters; the actual diameters may not be less than the nominal by more than 5.0% when measured approximately three (3) inches from the ends of the pipe. Water main minimum nominal diameter shall be six (6) inches. A variance may be granted by the Director to allow a reduction to four (4) inches minimum nominal diameter for water mains.

203-3 Poly Vinyl Chloride Pipe (PVC)

203-3.01 General

All pipe and fittings shall conform to the following:

  1. Pipe and fittings shall conform to AWWA-C-900 Class 150, DR 18, and ASTM-D-3139.
  2. Pipe fittings and couplings made from PVC shall have a minimum cell classification of 12454B or 12454C as defined by ASTM-D-1784.
  3. Each length of pipe shall be marked with the applicable ASTM, DR, cell classification, nominal pipe size and manufacturer's name or trade mark.
  4. A certificate of compliance from the pipe manufacturer shall be provided for each type of material used.
  5. PVC pipe shall not deviate-from straight by more than 1/16th inch per foot (camber) when the maximum offset is measured from the concave side of the pipe.113
  6. Double strap saddles shall be used for service taps.
  7. PVC pipe shall be of the bell and spigot type. Bells shall be factory attached to the pipe. Couplings may be used as allowed by the Engineer.

203-3.02 Storage and Handling of PVC Pipe PVC pipe shall be stored on a smooth bed. The pipe shall not be dropped or dragged. Stored pipe shall be covered to protect it from ultraviolet light (sun's rays). PVC pipe with noticeable color changes resulting from exposure to ultraviolet light shall be rejected by the Engineer.

203-3.03 Bedding Embedment materials (Class I, II, and III) shall conform to, Paragraphs 6.1.1, 6.1.2, and 6.1.3, ASTM D-2321 which reads as follows:

Class I - Angular, 1/4 to 1-1/2 inch, graded stone, including a number of fill materials that have regional significance such as coral, slag, cinders, crushed stone, crushed gravel, and crushed shells.

Class II - Coarse sands and gravels with maximum particle size of 1-1/2 inch, including variously graded sands and

gravels containing small percentages of fines, generally granular and non-cohesive, either wet or dry. Soil Types GW, GP, SW. and SP are included in this class.

Class III - Fine sand and clayey gravels, including fine sands, sand-clay mixtures, and gravel-clay mixtures. Soil Types GM, GC, SM, and SC are included in this class.

Soil classification is in conformance with Unified Soil Classification System ASTM Designation D-2487 and D-2488. Native soils meeting the requirements for Class II and Class III materials may be accepted by the Engineer.

Bedding procedure shall conform to Paragraphs 8.1.1, 8.1.2, and 8.1.3 of ASTM-D-2321 and the following:

    1. Bedding shall be placed and compacted for all main lines as shown on Plate W-4.114
    2. After placement and compaction of bedding and prior to installation of water main and laterals, the Engineer shall inspect the bedding placement and compaction.

203-3.04 Installation of Pipe, Fittings, and Haunching PVC pipe exposed to the sun during summer months shall be allowed to cool prior to connection to manholes or placement of haunching.

Allowance shall be made for the movement of pipe along the main line and at the laterals. Fittings shall be sized to receive type of pipe used. Installation of fittings shall be in accordance with manufacturers instruction manuals.

Pipe installation and haunching shall conform to Paragraphs 9.1.1, 9.1.2, and 9.1.3 of ASTM-D-2321, AWWA Standards and the following:

    1. After cooling of the PVC pipe, haunching shall be placed and compacted for all main lines as shown on plate W-4.
    2. Materials used for haunching shall be the same class as that used for bedding.
    3. Prior to placement and compaction of initial backfill, the Engineer shall inspect the placement of the water main and laterals, haunching and compaction.
    4. Care shall be exercised in placing haunching material to prevent damage to or displacement of, the water pipe.
    5. Initial backfill shall be placed as required to secure the pipe prior to testing in conformance with Section 203-3.07.

203-3.05 Cleaning

The completed water main shall be flushed and chlorinated in conformance with Section 208-7.

203-3.06 Testing

The completed water main and laterals shall be hydrostatically tested, after pipeline cleaning, but prior to completion of initial backfill and compaction in conformance with Section 208-6.115

203-3.07 Initial Backfill

Initial backfill shall conform to Paragraphs 9.1.1, 9.1.2, and 9.1.3 of ASTM-D-2321 and the following:

    1. After testing of the PVC pipe and placement and inspection of haunching, initial backfill placement shall be completed and compacted for all main lines as shown on plate W-4.
    2. Materials used for initial backfill shall be the same class as that used for haunching.
    3. Prior to placement and compaction of backfill, the Engineer shall inspect the initial backfill and compaction.
    4. Care shall be exercised in placing initial backfill material to prevent damage to or displacement of, the water pipe.

203-3.08 Backfill

The remainder of the trench backfill shall conform with Section 19-3 of the Standard Specifications and as follows:

    1. Section 19-3.062, "Slurry Cement Backfill", of the Standard Specifications is deleted.
    2. Backfill material shall be free of all rock or lumps, exceeding six (6) inches maximum dimension.
    3. Compacting of backfill material shall be required for all main lines and laterals as shown on the attached plate.


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