City of Oak Grove, MO Design and Material Criteria

[Ord. No. 1042 §2-1, 2-20-1992]

The water distribution system and any extensions thereof shall have adequate capacity to supply the normal or average and peak hour demands of all customers, domestic, public, commercial and industrial, maintaining a pressure of not less than thirty (30) pounds per square inch at all points of delivery, without reducing the service to any customers below these requirements, and shall have adequate capacity to be capable of delivering not less than one thousand (1,000) gallons per minute for fire protection on the day of maximum customer demand with a residual pressure of not less than twenty (20) pounds per square inch to at least one (1) point within three hundred (300) feet of each building to be served or proposed to be served by such system and extension. In apartment, commercial and industrial areas, fire flow shall meet the requirements of the "Standard Schedule for Grading Cities and Towns of the United States" of the National Board of Fire Underwriters, New York.

Section 515.050 Criteria for Estimating Demand.

[Ord. No. 1042 §2-2, 2-20-1992]

The following criteria will be used in estimating the average day demand, maximum day demand and peak hour demand incident to the determination of water main sizes.

Residential population = N = number of dwelling units x 3.5.

Average daily water demand of residential population in gallons per day (gpd) = R = N x 100.

Average daily commercial and industrial water demand in gpd = C = number of commercial and industrial employees x one hundred (100). Appropriate additional water demand allowance shall be made for commercial and/or industrial establishments of types having water demands in excess of one hundred (100) gpd per employee.

Average daily school water demand in gpd = S = number of staff employees and students x 20.

Average daily water demand in gpd = A = R + C + S.

Maximum daily water demand in gpd = M + A x 2.

Peak hour demand in gpd = P = M x 2.

Peak hour demand in gallons per minute (gpm) = P = 1440.

Section 515.060 Applicable Standards.

[Ord. No. 1042, §2-3, 2-20-1992]

Applicable standards shall be the latest revisions of the following:

American Water Works Association (AWWA).

C104 — cement-mortar lining for ductile-iron pipe and fittings for water.

C110 — gray-iron and ductile-iron fittings, 3-inch through 48-inch for water and other liquids.

C111 — rubber-gasket joints for ductile-iron and gray-iron pressure pipe and fittings.

C115 — flanged ductile-iron pipe with threaded flanges.

C150 — thickness design of ductile-iron pipe.

C151 — ductile-iron pipe centrifugally cast in metal molds or sand-lined molds for water or other liquids.

C500 — gate valves — 3-inch through 48-inch nps — for water and sewage systems.

C502 — dry-barrel fire hydrants.

C504 — rubber-seated butterfly valves.

C509 — resilient-seated gate valves for water and sewerage systems.

C550 — protective epoxy interior coatings for valves and hydrants.

American National Standards Institute (ANSI).

B16.1 — cast-iron pipe flanges and flanged fittings, classes 25, 125, 250 and 800.

B16.21 — non-metallic flat gaskets for pipe flanges.

American Society of Testing and Materials (ASTM).

A307 — carbon steel externally threaded fasteners.

Section 515.070 Water Mains and Fittings.

[Ord. No. 1042 §2-4, 2-20-1992; Ord. No. 1543 §1, 11-6-2006]

Mains and fittings of less than sixteen (16) inch size shall be cement-lined ductile iron.

No mains shall be designed for less than one hundred fifty (150) psi, nor be less than eight (8) inch size.

Pipe shall conform to AWWA C151.

All ductile-iron pipe and fittings shall be cement lined in accordance with AWWA C104.

Pipe and fittings shall be coated with manufacturer's standard coating.

Ductile-iron pipe thickness shall be determined according to AWWA C150. Minimum pipe thickness shall be Class 50.

Joints.

Flanged.

For all interior and exposed exterior pipe.

Flanges for pipe designed for internal pressures not exceeding two hundred fifty (250) psi shall conform to AWWA C115.

Mechanical and compression type.

Use mechanical or compression-type joints for all buried pipe unless otherwise specified.

Mechanical and compression-type joints shall conform to AWWA C111.

Fittings.

All fittings shall be ductile iron.

Flanged fittings shall conform with AWWA C110, drilled ANSI B16.1, Class 125.

Mechanical joint shall conform to AWWA C110.

Fittings for pipe with compression-type joints shall have mechanical or compression-type joints.

Furnish all specials, taps, plugs, flanges and wall fittings as required.

Gaskets And Bolting Materials.

Provide all gaskets, bolts, nuts, lubricant, and other accessories required to install pipe complete and ready for service.

Gaskets for flanged pipe shall be one-eighth (⅛) inch thick, full-faced, synthetic rubber conforming to ANSI B16.21.

Bolts for flanged pipe shall conform to ASTM 307, Grade B. Nuts and bolt heads shall be hexagonal.

Pipe and fittings shall be marked with the manufacturer's name, thickness class or design pressure and date of fabrication.

Section 515.080 Valves.

[Ord. No. 1042 §2-5, 2-20-1992]

All valves six (6) inch through twelve (12) inch size shall be gate valves conforming to AWWA C509 and shall close with clockwise rotation.

All valves larger than twelve (12) inch size shall be butterfly valves conforming to AWWA C504 and shall close with clockwise rotation.

Valves shall be installed at appropriate points in all mains to permit cutting off water from sections of reasonable length. Each valve shall be accessible for operation only with standard valve key through a valve box approved by the Department extending to the ground surface. Valve box lids shall be marked "Water". Valves shall be one (1) of three (3) manufacturer's models as specified by the department.

Section 515.090 Fire Hydrants.

[Ord. No. 1042 §2-6, 2-20-1992; Ord. No. 1643 §1, 7-6-2009; Ord. No. 2036, 6-6-2022]

All fire hydrants shall be the traffic model, break-away type, and conform to the current AWWA specification C502. Such hydrants shall have two (2), two and one-half (2 1/2) inch nozzles and one (1), four and one-half (4 1/2) inch pumper nozzle with national standard fire hose coupling screw thread.

Nozzle caps shall be the "nut type" having the same dimensions as the operating nut. Such caps shall be securely chained to the base of the hydrant.

Operating nut shall include the weather shield.

Hydrant shall be furnished with a six (6) inch isolation gate valve.

Direction to open shall be counterclockwise and be marked as such.

Hydrants shall come with an oil reservoir.

Hydrants shall be manufactured safety red, or other red as approved by the City Engineer.

Hydrants shall be furnished with temporary black plastic caps or shall be covered with a black plastic bag until the hydrants are available for service.

Fire hydrant shall be Mueller "Centurion," Waterous "Pacer 90 or 100," Clow Valve "Medallion," or other as approved by the City Engineer.

Hydrants shall be new.

Tapping sleeves and valves shall be Mueller, Waterous, Clow Valve, or American Flow Control (AFC).

Butterfly valves shall be Mueller or American Flow Control (AFC).

Gate valves shall be Mueller, Waterous, or American Flow Control.

Hydrant collars shall be installed on the our and one-half (4 1/2) outlet of all new hydrants to indicate the flow in gallons per minute (GPM). The colors shall be as follows:

Blue: 1,500 GPM or more.

Green: 1,000 — 1,499 GPM.

Orange: 500 — 999 GPM.

Red: Below 500 GPM.

The other side of the hydrant collar shall indicate: "Out of Order."

Section 515.100 Design on State or County Highways.

[Ord. No. 1042 §2-7, 2-20-1992]

The State and County Highway Departments require a permit for work to be performed on roadways or easements under their jurisdiction. No work will be permitted by the Water Department that has not been designed and approved as satisfactory by the State or County Highway Departments.