Section 15100 VALVES, GENERAL

Section 15100

VALVES, GENERAL

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The Contractor shall provide all tools, supplies, materials, equipment, and labor necessary for furnishing, epoxy coating, installing, adjusting, and testing of all valves and appurtenant work, complete and operable, in accordance with the requirements of the Contract Documents. Where buried valves are shown, the Contractor shall furnish and install valve boxes to grade, with covers, extensions, and position indicators.

B. The provisions of this Section shall apply to all valves and valve operators specified in the various sections of Division 15 of these Specifications except where otherwise specified in the Contract Documents. Valves and operators in particular locations may require a combination of units, sensors, limit switches, and controls specified in other sections of these Specifications.

1.2 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

A. Comply with the reference specifications of the General Conditions.

B. Comply with the current provisions of the following codes and standards.

ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250, and 800

ANSI B16.5 Pipe Flanges and Flanged Fittings, Steel Nickel Alloy and other

Special Alloys

ANSI/ASME B1.20.1 General Purpose Pipe Threads (inch) ANSI/ASME B31.1 Power Piping

ASTM A 36 Specification for Structural Steel

ASTM A 48 Specification for Gray Iron Castings

ASTM A 126 Specification for Gray Iron Castings for Valves, Flanges, and

Pipe Fittings

ASTM A 536 Specification for Ductile Iron Castings

ASTM B 61 Specification for Steam or Valve Bronze Castings

ASTM B 62 Specification for Composition Bronze or Ounce Metal Castings

ASTM B 148 Specification for Aluminum-Bronze Castings

ASTM B 584 Specification for Copper Alloy Sand Castings or General

Applications

ANSI/AWWA C500 Metal-Seated Gate Valves for Water Supply Service

ANSI/AWWA C503 Wet-Barrel Fire Hydrants

ANSI/AWWA C504 Rubber-Seated Butterfly Valves

ANSI/AWWA C506 Backflow Prevention Devices - Reduced Pressure Principle and

Double Check Valves Types

ANSI/AWWA C507 Ball Valves 6 inches through 48 inches

AWWA C508 Swing-Check Valves for Waterworks Service, 2 inches through

24 inches NPS

ANSI/AWWA C509 Resilient-Seated Gate Valves for Water and Sewage Systems

AWWA C550 Protective Interior Coatings for Valves and Hydrants

SSPC-SP-5 White Metal Blast Cleaning

MSS-SP-70 Manufacturers Standardization Society of the Valve and Fitting

Industry, Cast Iron Gate Valves, Flanged and Threaded Ends

1.3 SUBMITTALS

A. Submittals shall be made in accordance with General Conditions. In addition to product information, the Contractor shall submit for approval layout drawings showing valve locations within the piping system, valve supports, and identification numbers.

B. The following submittals and specific information shall be provided:

1. Shop Drawings: Shop drawings of all valves and operators including associated wiring diagrams and electrical data, shall be furnished as specified in the General Conditions.

2. The use of each valve configuration shall be indicated by listing in the submittal the valve identification numbers shown on the Plans. Valves not shown on the Plans shall be identified by a description of the uses and quantities.

1.4 QUALITY ASSURANCE

A. Valve Testing: Valves shall be shop tested per manufacturer's recommendations and applicable AWWA/ANSI specifications prior to shipment. Manufacturer's certification that valves have been shop tested shall be submitted for approval 30 days prior to scheduled shipment.

B. Shop Inspection: Shop inspection of valve construction, testing and coating shall be witnessed and approved by the Engineer. All valves will be shop inspected unless otherwise waived in writing by the Engineer.

PART 2 - PRODUCTS

2.1 VALVES

A. General: The Contractor shall furnish all valves, gates, valve-operating units, stem extensions, and other accessories as shown or specified. All valves and gates shall be new and of current manufacture.

B. Valve Flanges: The flanges of valves shall be in accordance with Section 15000.

C. Manual Operators: All shut-off valves, 6-inch and larger, shall have operators with position indicators. Where buried, these valves shall be provided with valve boxes and covers containing position indicators, and valve extensions. Unless otherwise indicated on the contract drawings, valves located less than 6 feet above the floor shall be equipped with a lever-actuated or wheel-actuated operator. Shut-off valves mounted higher than 6 feet above working level shall be provided with chain operators. Chain operators shall have hot-dip galvanized chain extending to within 4 feet from the floor.

D. Powered Valve Operators: Where shown, certain valves and gates shall be furnished with powered operators, provided by the valve or gate manufacturer. The same manufacturer shall furnish all operators of a given type. All valve operators, regardless of type, shall be installed, adjusted, and tested by the valve manufacturer at the manufacturing plant. Unless otherwise specified, all electric, pneumatic, and hydraulic valve operators shall be in accordance with Section 15101.

E. Position Indicators: Valves 6 inches and larger shall have a clearly marked position indicator on the valve. The position indicator shall be clearly visible from a distance of at least 10 feet.

F. Valve Labeling: Except when such requirement is waived by the Engineer in writing, a label shall be provided on all shut-off valves exclusive of hose bibs. The label shall be as specified in Section 15005, and shall be permanently attached to the valve or on the wall adjacent to the valve as directed by the Engineer.

G. Nuts and Bolts

1. All nuts and bolts on valve flanges and supports shall be steel, galvanized after fabrication. Steel for bolts shall be in accordance with the requirements of ASTM A 307 Grade A or B. Where exposed to water, sewage, sewer gas, submerged or buried, all nuts and bolts on valve flanges and valve bodies shall be Type 316 stainless steel.

2. Where dissimilar metals are bolted together, Type 316 stainless steel bolts shall be used.

H. Brass or Bronze: Unless otherwise specified, all interior bronze parts of valves shall conform to the requirements of ASTM B 62, or, where not subject to dezincification, to ASTM B 584. Brass or bronze used in the construction of any part of any valve in contact with sewage shall not contain more than 6 percent zinc nor any aluminum except that bronze stems may have not more than 1-1/2 percent aluminum and not more than

7 percent zinc.

I. Buried Valves and Valve Boxes: Valve boxes shall be of the cast-iron sliding adjustable Buffalo type. The valve shall be provided with a 2-inch square-operating nut and an extension to within two feet of the operating surface. The extensions shall be hot-dip galvanized after fabrication. One hot-dip galvanized operating tee wrench of approved size shall be furnished with each underground valve.

PART 3 - EXECUTION

3.1 VALVE INSTALLATION

A. General: All valves, gates, operating units, stem extensions, valve boxes, and accessories shall be installed in accordance with the manufacturer's written instructions and as shown and specified. All gates shall be adequately braced to prevent warpage and bending under the intended use. Valves shall be firmly supported to avoid undue stresses on the pipe.

B. Access: All valves shall be installed to provide easy access for operation without special tools or ladders, for removal and for maintenance, and to avoid conflicts between valve operators and structural members or handrails.

C. Valve Operators and Accessories

1. Where combinations of valves, sensors, switches, and controls are specified, it shall be the responsibility of the Contractor to properly assemble and install these various items so that all systems are compatible and operating properly. The relationship between system elements shall be clearly described on shop drawing submittals.

2. Valves shall be installed so that when handles are moved from full open to full- closed position they shall clear all obstructions. If levers or handles impede access around valves, storage for removed levers or handles shall be provided on a nearby wall. Location and orientation of all valve operators shall be subject to the Engineer’s approval. Operators shall move through their entire range with no more than 40 pounds of applied force. For chain operators, mount cleats on walls as necessary to secure chain and to prevent interference in passageways or with equipment access. Arrangement shall be as indicated on the Contract Documents.

3. Valves shall be installed to present minimum hazard to personnel. Handwheels shall generally be between 24 and 54 inches above grade or floor. Horizontal, unguarded stems shall not be installed below 24 inches or between 54 and 75 inches above grade.

4. Handles for all valves 6 inches and larger shall be malleable iron or steel.

D. Field Testing: All valves shall be field tested following installation to demonstrate that the valve operates under field conditions in a manner consistent with the design of the system. All field testing of valves shall be witnessed and approved by the Resident Project Representative.

3.2 METHOD OF CONNECTION

A. Unless otherwise noted or indicated, all valves 2-1/2-inches and larger shall have flanged ends; all valves smaller than 2-1/2-inches shall have threaded ends, except valves in welded steel pipes shall be flanged. All valves installed in a given pipe shall be designed to withstand the test pressure, generally 1-1/2 times the working pressure for that particular pipe. All threaded-end valves shall be installed with unions within 6 inches from the threaded ends.

3.3 BURIED VALVES

A. All underground valves shall be installed with cast-iron valve boxes set over the valve with no weight bearing on the valve or pipe. Underground valves shall be given one coat of coal tar epoxy in the field during installation. This coating shall be protected from damage during installation and backfill. Coating shall be touched up before backfill.

3.4 POSITION INDICATORS

A. Valve operators and position indicators shall be installed and orientated to provide clear visibility from the nearest accessible operator work area and shall be subject to the Resident Project Representative’s approval.

END OF SECTION