Section 15110 PLUG VALVES

Section 15110

PLUG VALVES

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The CONTRACTOR shall furnish and install plug valves, complete and operable, as shown and specified herein including operators, protective coatings, and appurtenant Work, in accordance with the requirements of the Contract Documents.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Section 09800, Protective Coating

2. Section 15100, Valves, General

3. Section 15101, Valve Operators

1.3 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS

A. All Work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof are not in conflict with other provisions of these Specifications.

B. Comply with the applicable editions of the following codes, regulations and standards.

1. Industry Standards:

ASTM A 126 Standard Specification for Gray Iron Castings for

Valves, Flanges, and Pipe Fittings

AWWA C550 Protective Interior Coatings for Valves and

Hydrants

2. Other Standards:

ANSI American National Standards Institute

UL Underwriters Laboratories

C. Comply with the applicable reference Specifications as directed in the General

Requirements and Additional General Requirements.

1.4 CONTRACTOR SUBMITTALS

A. Submittals shall be made in accordance with the General Requirements, Additional

General Requirements and as specified herein.

B. Submittals shall be made in accordance with Section 15100, Valves, General.

1.5 QUALITY ASSURANCE A. General:

1. All valves shall be tested in accordance with manufacturer's recommendation and applicable AWWA/ANSI specifications.

1.6 WARRANTY

A. Guarantees and Warranty shall be furnished in accordance with “Warranty” (CONTRACTOR’s Guarantee) of the General Conditions and Section 15100, Valves, General.

PART 2 - PRODUCTS

2.1 ECCENTRIC PLUG VALVES A. Equipment Requirements:

1. Eccentric plug valves shall be of the non lubricated eccentric type with cast iron bodies. The plug face shall be isobuten-isoprene, capable of withstanding

250 degrees F.

2. The valve body shall be ASTM A 126, Class B cast iron, with flanged ends. The body seats in valves 4 inches and larger shall be have an overlay of not less than 90 percent nickel on surfaces contacting the plug face. The plug shall be ductile iron.

3. Unless otherwise shown or specified, all valves for sizes 4 inches and larger shall have worm gear operators with all gearing enclosed and seals on all shafts to prevent entry of dirt and water, and ANSI 125 pounds per inch flanged or grooved ends. The operator shall clearly indicate valve position.

4. All Internal parts, except the body and plug, shall be Type 316 stainless steel, Monel, or nickel. The stem-bearing and bottom-bearing shall be made of stainless steel. Exposed nuts, bolts, and washers shall be Type 316 stainless steel.

5. Valves 4 inches and smaller shall have operating levers, and flanged ends. The body seats in valves 4 inches and smaller shall be have an overlay of not less than

90 percent nickel on surfaces contacting the plug face.

6. All submerged and buried valves shall be equipped with worm-gear operators, lubricated and sealed to prevent entry of dirt and water into the operator.

7. All shaft bearings shall be of stainless steel, furnished with permanently lubricated bearing surfaces.

8. All valves shall have an unobstructed port area of not less than 80 percent of full pipe area.

9. All eccentric plug valves shall have a pressure rating of not less than 150 pounds per inch WOG for bubble-tight shutoff.

10. Surface Coating: Ferrous surfaces of valves, 4 inches and larger, that will be in contact with process fluid, shall be amine cured epoxy coated as specified for System No. 100, Section 09800, Protective Coating and in AWWA C550.

11. A flat compression washer made of Viton shall be provided on the valve stem between the plug and the bonnet. This washer shall act as a seal to prevent matter from entering the top bearing. The top and bottom trunnion bearings shall include an O-ring silt seal of the same material as the plug facing. Stem seals shall be serviceable without unbolting the valve bonnet assembly.

12. Valves for natural gas service shall be UL listed. B. Manufacturer, Or Equal:

1. DeZurik Corporation.

2. Milliken.

3. Val-Matic.

a) Victaulic. b) Keystone.

PART 3 - EXECUTION

3.1 INSTALLATION

A. All plug valves shall be installed in strict accordance with the manufacturer's published recommendations and the applicable provisions of Section 15100, Valves, General.

B. Buried plug valves shall be provided with valve boxes, operating nuts, and tee- wrench handles and installed as specified in Section 15100, Valves, General, of these Specifications.

C. Eccentric Plug Valves: Unless otherwise directed, the following rules shall be observed for the installation of eccentric plug valves on sewage, sludge, or other liquid systems containing solids, silt, or fine sand:

1. The valves shall be positioned with the stem in the horizontal direction.

2. Valves shall be installed so that in the closed position the pressure in the pipeline shall apply a seating head on the valves.

3. In horizontal pipelines, the plug shall swing upwards when opening, to permit flushing out of solids.

4. The orientation of the valve shall prevent the valve body from filling up with solids, when closed. However, where the pressure differential through the valve exceeds 25 pounds per inch, the higher pressure for valves without worm gear, electric, or air operators, shall be through the valve, to force the plug against the seat.

5. Valves that may be closed for extended periods (stand-by, bypass, or drain lines), and valves with reversed flow (higher pressure on downstream side, forcing the plug away from its seat), shall be equipped with worm gear operators for all sizes

4 inches and larger.

6. For special applications, or when in doubt, consult with the manufacturer prior to installation.

D. Field testing of valves shall be performed in accordance with manufacturer's recommendations and per Section 15100, Valves, General, of these Specifications.

E. All field-testing shall be witnessed by the ENGINEER and be subject to ENGINEER’s acceptance.