Town of Carmel, NY Main Specifications

Type and class of pipe. All cast-iron pipe shall meet the requirements of the specifications tabulated below and shall accord with the pressure and thickness classifications tabulated:

Material Specifications	Pressure Class	Thickness Class
ASA A21.2-1953; AWWA C102-53	150	3
ASA A21.6-1962; AWWA C106-62	150	24
ASA A21.8-1962; AWWA C108-62	150	24

Joints.

Mechanical joints shall meet the requirements of ASA Specification A21.11-1964 and shall have the same pressure rating as the pipe of which it is a part. Assembly of mechanical joint fittings shall be completed with a torque wrench. Torque to be applied to each bolt shall be between 60 pounds and 90 pounds. After all pipe and fitting joints have been completed, there shall be inserted in each joint two bronze wedges as furnished by the pipe manufacturer. They shall be firmly driven between the outside surface of the pipe and the inside surface of the socket. The wedges shall be placed 180° apart on the horizontal axis.

Except as necessary to connect into existing pipe, rubber ring-type gaskets shall be used with bell-and-spigot pipe, mechanical joints or push-on joints, which gaskets shall be equal to Fastite as made by the American Cast Iron Pipe Company, Bell-Tite as made by the Clow Company, Tyton as made by the United States Cast Iron Pipe Company.

A thin coat of lubricant shall be applied to each spigot end as required by ASA Specification A21.11-1964.

Fittings. All bell-and-spigot cast-iron fittings shall meet the requirements of AWWA Standard C100-55 Specifications, Class D. Mechanical joint cast-iron pipe fittings shall meet the specifications of ASA A21.10-1952.

Coating and lining. All cast-iron pipe and fittings shall be coal-tar pitch coated on the outside and cement-lined on the inside, in conformance with ASA A21.4-1964 Specification. Coating and lining shall be accomplished at point of manufacture.

Asbestos-cement pipe.

Material and class. All asbestos-cement pipe and appurtenances therefor shall conform to the requirements of the current AWWA Standard Specification C400-65 or ASTM C-296-64T Type No. 2 in all respects, including the following:

The class of the pipe to be furnished shall be Class 200 for pipe sizes up to eight-inch pipe and Class 150 above eight-inch pipe.

Certified records of tests made by the manufacturer or by an approved commercial laboratory, or by both as required by the Town Engineer, shall be submitted to the Engineer with each shipment of pipe.

The performance of three-edge bearing tests will be required.

Couplings. One coupling shall be furnished with each standard, random and short length of pipe. It shall consist of an asbestos-cement sleeve and two solid rubber rings of uniform cross section and shall be suitable in size and design for the pipe with which it is used. The coupling shall be similar and equal to the Ring-Tite coupling as manufactured by the Johns-Manville Corporation.

Rubber ring gasket. The gasket shall be suitably formed of high quality vulcanized rubber, made to exact dimensions and in the form of a solid ring. The composition of the rubber, its hardness and other properties, and the design of the gasket recess, shall be such that the joint is liquidtight under all pressure ranges from a vacuum up to the maximum rating of 350 pounds per square inch internal liquid pressure. Sufficient lubricant shall be furnished to provide a thin coat on each spigot end. The lubricant shall be that recommended by the pipe manufacturer and must be applied in strict conformity with manufacturer's recommendations. The lubricant shall be nontoxic, shall impart no taste or odor to the water and shall have no deleterious effect on the rubber gasket.

Specials and fittings. Specials and fittings shall be cast iron and shall meet the requirements specified under § 151-2A(3) of these specifications. Where applicable, fittings shall have all bell connections of standard AWWA dimensions or special dimensions as required or shall be equipped with adaptors.

Asbestos-cement adaptors. Adaptors shall be used for joining asbestos-cement pipe to valves, hydrants and as required for cast-iron fittings. Adaptors shall be of the proper class, size and type, as recommended by the manufacturer, for the valve, hydrant or fitting concerned.

Connections to valves, hydrants and fittings. Connections between asbestos-cement pipe and valves, hydrants and fittings shall be made with the jointing materials as specified under § 151-2A(2) or with materials as recommended by the pipe manufacturer and approved by the Engineer.

Markings on cast-iron pipes and couplings.

Cast-iron pipe and fittings. Each length of pipe and each random and short length of pipe shall be marked with the manufacturer's name, trade name, nominal size, class, hydrostatic test pressure, a "T" to signify it was tested and date of manufacture.

Each coupling shall be marked by the manufacturer with the manufacturer's identification, the size, the year of manufacture and the classes of pipe with which it can be used.

§ 151-3 Installation.

Excavations.

Trench width. The trench width may vary with and depend upon the depth of trench and the nature of the excavated material encountered, but in any case shall be of ample width to permit the pipe to be laid and jointed properly and the backfill to be placed and compacted properly. The minimum width of unsheeted trench shall be at least 18 inches larger than the outside diameter of the pipe except by consent of the Town Engineer; the maximum clear width of trench shall be not more than two feet greater than the outside pipe diameter. When sheeting and bracing is used, the trench width shall be increased accordingly.

Pipe cover. Minimum cover over the top of water mains shall be four feet zero inches measured from the established grade of street. Cover in excess of five feet zero inches shall be approved by the Town Engineer.

Bedding.

The trench, unless otherwise specified, shall be excavated at least four inches below the bottom of the pipe and bottom brought back to grade by thoroughly compacting selected backfill which meets the requirements of Subsection B(2) of this section.

When the uncovered trench bottom at subgrade is soft and, in the opinion of the Town Engineer, cannot support the pipe, a further depth and/or width shall be excavated and refilled to pipe foundation grade with slag, stone, sand or other approved material, or other approved means shall be adopted to secure a firm foundation for the pipe.

Ledge rock, boulders, large stones and shale shall be removed to provide a clearance of at least six inches below all parts of the pipe, valves or fittings, and a clear width of nine inches on each side of all pipe shall be provided.

(d)

Bell holes of ample dimensions shall be dug at each joint to permit the jointing to be made properly. Adequate clearance for properly jointing pipe laid in rock shall be provided at bell holes.

Sheeting and bracing. Sheeting and bracing shall be used as required or ordered by the Town Engineer to support the sides of trenches or other excavation; such sheeting and bracing shall be removed as the trench or excavation is backfilled, unless the Town Engineer shall order the same left in place.

Backfilling.

The backfilling shall be first done over the middle portion of each length of pipe, bringing the cover to a depth of at least one foot over the top of the pipe, leaving all joints exposed until after the pipe has been tested for tightness. After the pipe has been tested and passed by the Engineer, the rest of the backfilling shall be done in the same manner.

Selected backfill. All backfill under, around and to a depth of one foot over the top of all pipes and valves shall be made with a selected material thoroughly tamped or puddled. The material to be used for selected backfill embedment shall be a natural bank sand graded from fine to coarse, not lumpy or frozen, and free from slag, cinders, ashes, rubbish or other deleterious or objectionable material. It shall not contain a total of more than 10% by weight of loam and clay, and all material must be capable of being passed through a three-fourths-inch sieve. Not more than 5% shall remain on a No. 4 sieve. Samples of the material to be used shall be submitted to and be approved by the Town Engineer or his authorized agent. Limestone screenings, sand, bank-run gravel and approved excavated material may be utilized with the approval of the Engineer.

Earth backfill.

Only after the backfill previously mentioned has been satisfactorily compacted may work proceed in placing the remaining backfill, which must be carefully placed and compacted by tamping, puddling or rolling. All precautions must be taken to eliminate future settlement. The number of men tamping shall be not less than the number backfilling, and additional men shall be kept in the trench to spread the material.

Where pavements, driveways, curbing and sidewalks are to be placed or are to be replaced, all backfill placed over the pipe shall be compacted, with the use of approved vibratory or flat-faced mechanical tampers, in layers not more than 12 inches thick, loose measurements, to a density satisfactory to the Town Engineer or his authorized representative.

Backfilling shall not be done in freezing weather, except by permission of the Town Engineer, and it shall not be made with frozen material, nor shall any fill be made where the material already in the ditch is frozen.

(d)

All backfill above a plane one foot above the top of all pipes may be made with material excavated from the trenches, provided that the same is satisfactory to the Town Engineer. If, in the opinion of the Town Engineer, the material excavated is unsatisfactory, other material suitable for backfill shall be used. All backfill shall be free from slag, cinders, rubbish and other objectionable material.

Pipe laying.

Pipe, couplings and fittings shall be handled and installed in accordance with the recommendations of the pipe manufacturer. Proper and suitable tools and appliances for the safe and convenient handling and laying of the pipes and fittings shall be used. Under no circumstances shall pipe or accessories be dropped or dumped into the trench or bumped while handling.

Great care shall be taken to prevent the pipe coating from being damaged, particularly on the inside of the pipes and fittings, and any such damage shall be remedied as directed. All pipes and fittings shall be carefully examined for defects just before laying, and no pipe or fitting shall be laid which is known to be defective. Pipes shall be laid only in properly prepared trenches and on compacted-sand cradle, true to line and grade and with no dips or rises except as required by the design.

All pipes and fittings shall be thoroughly cleaned before they are laid, shall be kept clean until they are used in the completed work, and when laid, shall conform to the lines and grades of the design. Open ends of pipe shall be kept plugged with a bulkhead during construction.

Pipe laid in trench shall be laid to a firm and even bearing in material for its full length. Precautions shall be taken against floating of asbestos-cement pipe. Any pipe which has floated shall be removed from the trench and be relaid as directed by the Town Engineer.

No pipe shall be laid in wet trench conditions which preclude proper bedding as specified, or on frozen trench bottom, or when, in the opinion of the Town Engineer, the trench conditions or weather are unsuitable for proper installation.

It is the intention of these specifications to secure first-class workmanship in the placing of pipe and accessories.

Nonstandard deflections. Wherever changes in line and grades of the main are not standard fitting deflections, combinations of standard cast-iron fittings and small deflections in the adjoining lengths of pipe will be permitted, subject to the following limitations:

For cast-iron bell-and-spigot pipe, the maximum deflection at each joint shall be 3°.

For cast-iron mechanical joint pipe, the above deflection shall be limited to 5°.

For asbestos-cement pipe, the above deflection shall not exceed that recommended as maximum by the pipe manufacturer.

Buttresses and anchorages. Bends, tees and plugged ends shall be buttressed or anchored with poured concrete as directed by the Town Engineer.

Operation of valves. The operation of all gate valves on existing mains for making connections, tests or for any other cause shall be done by the Town Water District, and sufficient notice shall be given to the Town Water District by the contractor so that the work may be done with a minimum of inconvenience to the public and delay to the contractor.

§ 151-4 Testing and sterilization.

Testing.

After the pipe is laid and before backfill is placed around joints, such lengths of the water main as the Town Engineer may have determined shall be tested under hydrostatic pressure. The section of pipe to be tested shall be filled with water for a minimum period of 48 hours and then subjected to the test. Unless otherwise specified, the test pressure shall be 50% greater than the operating pressure gradient at the lowest elevation of the system. The duration of the test shall be two hours unless otherwise directed by the Town Engineer. Under test, pipelines shall show leakage not exceeding 50 gallons per 24 hours per inch diameter per mile of pipe.

Tests shall be under the direction of the Town Engineer or his designate. The contractor shall furnish a pressure gauge for measuring the pressure on the water main and shall also furnish a suitable pump, pipes and all appliances, labor, fuel and other appurtenances necessary to make these tests. The test pressure shall be maintained for a sufficient length of time to allow for a thorough examination of joints and elimination of leakage where necessary. The pipeline shall be made watertight under the test pressure.

Disinfecting and sterilization.

In each length of pipe the contractor shall place high-test calcium hypochlorite (HTH tablets); two tablets in each sixteen-foot length, placing them at opposite ends of the pipe. On sizes of pipes larger than eight inches, an additional dosage required shall be determined by the Engineer. Disinfected water must lay in mains for a minimum of 24 hours before being thoroughly flushed for usage.

The contractor shall furnish the necessary labor, equipment and material required for such chlorination. The contractor shall furnish the necessary labor for excavating and backfilling which will be required for the chlorination work. Chlorination by the contractor shall be continued or repeated until tests conducted by the Town Engineer shall indicate an acceptable residual of chlorine is present in the water.

Following chlorination, all treated water shall be thoroughly flushed from the newly laid pipe at its extremities until the replacement water throughout its length shall, upon test, both chemically and bacteriologically, be proven equal the water quality served the public from the existing water supply system.

§ 151-5 Valves.

Gate valves.

All gate valves shall conform to the AWWA Specifications for Water Valves, Designation C500-61, except as herein modified. Gate valves three inches and larger in size shall be equal to Darling AWWA Gate Valves as manufactured by the Darling Valve and Manufacturing Co., of Williamsport, Pennsylvania, or to Rensaelaer List 13A Gate Valves as manufactured by the Rensaelaer Valve Company of Troy, New York.

All gate valves three inches and larger in size shall be of the iron-body, bronze-mounted, double-disc, parallel-seat type, with nonrising bronze stem, shall open by turning to the left and shall be operated by nut or handwheel as required.

Where specifically required, the contractor shall furnish and install gate valves of the O.S. and Y type, otherwise meeting the above specifications.

All gate valves shall be designed for 150 pounds' working pressure and shall withstand an internally applied hydrostatic pressure at all points of at least 300 pounds per square inch. A factor of safety of not less than 10 shall be used in the valve design.

All valves (gate) shall be of the same size as the water main in which they are to be installed.

Tapping sleeves and tapping valves.

Tapping sleeves and valves shall be used for all connections six inches and larger in size to any existing main where 10 or more domestic services would be shut off if a tee or other connection were to be made.

The tapping sleeves shall be properly sized to fit the existing mains to which connections are to be made.

The sleeves shall be of the bolted type, of rugged cast-iron construction of ample strength for the service intended, and shall be caulked with lead the full length of the sleeve after attachment to the existing main. The existing pipe shall be thoroughly cleaned prior to installation of the tapping sleeve.

Tapping valves shall be not less than one size smaller than the diameter of the existing main to which connection is to be made, unless otherwise permitted by the Town Engineer.

The tapping valves shall meet the above AWWA Specifications for gate valves, except that oversized seat rings shall be provided to permit the use of full-sized cutters through the valve. The valve ends shall be flanged, with flanges plain-faced and drilled to ASA one-hundred-twenty-five-pound standards. The valves shall be nut-operated and shall open by turning to the left. Tapping valves shall be installed and open vertically.

Tapping sleeves and valves shall be equal to those manufactured by the A.P. Smith Company of East Orange, New Jersey.

Valve boxes and covers. Valve boxes and covers shall be installed over each vertically set, buried valve and elsewhere as directed. Valve boxes and covers shall be of the adjustable type and shall be equal to standard valve box No. F-2450, of the required length, as manufactured by the Clow Co. Valve box covers shall be of the stay-put type (Clow F-2494) with the letter "W" cast thereon in raised letters. Base size and extension piece length shall be as required for each individual size of valve and depth of bury.

Corporation stops.

A corporation stop shall be installed at each service connection.

Corporation stops shall be as manufactured by the Mueller Company and equal to Grinnel Fig. H-1003 with Mueller inlet thread and IP outlet thread one size larger than body.

§ 151-6 Hydrants.

Location and number. The location and number of hydrants shall be approved by the Town Engineer.

Size and type.

All hydrants shall be six inches in size with six-inch mechanical joint inlet connection and shall be equal to the Model H100 as manufactured by the A.P. Smith Manufacturing Company, East Orange, New Jersey.

Each hydrant shall have the name of the maker and the year when made and size of main valve opening cast upon it in raised letters.

Unless otherwise directed by the Town Engineer, each hydrant shall be fitted with one four-and-one-half-inch National Standard thread steamer nozzle and two two-and-one-half-inch National Standard thread hose nozzles. The size and thread of all outlets shall meet the standards of the local Fire Department.

The main valve shall open by turning in a counterclockwise direction and shall open against the pressure. This valve shall be faced with rubber which shall seat against an accurately machined bronze seat.

The top cap of the hydrant shall be provided with a waste or drip to prevent the cap from filling with water.

The hydrants shall be provided with automatically operated draining valves to permit drainage of the hydrant when the main valve is in closed position.

(7)

The head of the revolving nut or operating nut and nozzle cap nuts shall be of the exact dimensions of those now in use in local water district.

(8)

The nozzle caps shall be secured to the hydrants by means of galvanized or cadmium-plated steel chain of not less than one-eighth-inch-diameter links.

(9)

The hydrant bottom, connecting pipe, head, packing dome, date, nozzle cap and umbrella operating nut shall be made of cast iron.

(10)

All bolts and nuts shall be of the best quality of wrought iron or steel, rustproofed; the heads, nuts and threads shall be of standard size. All joints shall be faced true and smooth so as to make a perfectly watertight joint.

(11)

All castings, whether of iron or bronze, shall be of uniform thickness in their several parts and shall be sound and smooth, without cold-shuts, sand holes or other defects of any description. All materials shall conform to those as required by AWWA Specifications C502-54.

Cleaning and painting.

All iron parts of the hydrant, inside and outside, shall be thoroughly cleaned, and thereafter all surfaces, inside and outside, except the exterior portion above ground line, shall be shop-painted with two coats of asphalt varnish conforming to the requirements of Federal Specification TT-V-51A or Army-Navy Specification JAN-P-450. The first coat shall be allowed to dry thoroughly before the second coat is applied.