1.01 Scope of Work

Furnish all labor, materials and equipment required to receive, install, field test and make ready for service filament wound fiberglass reinforced plastic (FRP) custom detailed metering manhole structures, as shown on the Plans and as specified herein.

1.02 Submittals

Shop drawing/technical data brochures shall be submitted to the Engineer, as provided in the Specification General Requirements, showing details of construction and erection, including:

A. Dimensions of manhole structures, and dimensions and location of all fittings and attachments.

B. Complete description of integral primary flow measurement device, including flow characteristic charts and curves.

C. Complete description, with applicable catalog data, for flexible pipeline connectors and any other accessory equipment associated with the manhole structure.

D. Instructions for handling, storage and installation.

The submittal shall be presented in an organized format, with table of contents and labeled sections.

Shop drawings shall be approved by the Engineer prior to start of fabrication. Engineer's approval shall not relieve the Contractor of responsibility for compliance with these Specifications. Any proposed changes to these Specifications shall be stated in writing.

1.03 Reference Standards

The completed manhole structure shall be in accordance with ASTM D 3753 "Standard Specification for Glass Fiber-Reinforced Polyester Manholes", current issue.

1.04 Quality Assurance

The fiberglass manhole structures shall be products of a firm having proven specific experience with similar structures currently in service under similar design performance requirements.

Related manhole structures and accessory like items shall be the products of one manufacturer to provide standardization for appearance, maintenance and service. The manhole structures shall be products of Composite Structures Inc, Omaha, Nebraska or Engineer-approved equal.

1.05 Delivery, Storage and Handling

Instructions shall be provided for unloading, storage and installation.

All openings shall be securely covered to prevent damage and preclude entrance of dirt, water and debris.

Circumferential fabric straps shall be utilized for lifting and handling. Lifting connections to nozzles or other fittings will not be permitted.

2.0 PRODUCT DETAILS

2.01 Materials Suitability and Structural Capabilities

Each structure shall be rated for continuous service in contact with the specified liquid being metered, the atmosphere created within the structure and the external subsurface soil characteristics encountered.

All portions of the metering manhole structure shall be specifically designed to resist saturated soil hydrostatic loading at subsurface elevations shown on the Plans. Lower portions of the cylindrical shell may include concentric ribs as appropriate for structural stabilization. and increased flotation resistance.

The completed structure shall be specifically capable of withstanding load testing, stiffness, and soundness testing as called for in ASTM Standard D 3753.

2.02 Laminate Fabrication

Each manhole structure shall be constructed with an interior corrosion barrier 50 mil min. The inner surface shall include a suitable surfacing veil, and shall have a 90% resin-to-glass ratio. The internal layer shall include chopped Type E glass fiber reinforcement, and the glass content of the combination liner and interior layer shall be 27+5% by weight.

The balance of the laminate in the cylindrical shell shall be helically wound with continuous filament Type E glass fiber at an angle of not more than 60 degrees as measured relative to the axis of the cylinder, up to the final thickness required for structural loading.

Resin utilized throughout the laminate shall be chemical grade isophthalic polyester, resistant to corrosive atmospheres and corrosive soil conditions.

2.03 Fittings and Accessories

Piping connections and fiberglass accessory items shall be shop-laminated to the structure, located as shown on the Plans.

Inlet and outlet connections shall be plain end, provided with flexible Elastomeric PVC couplings having stainless steel attachment bands and fasteners.

All fastener hardware utilized in assembly or anchorage of the vessels shall be Type 316 stainless steel.

Each manhole structure shall be furnished with a certification nameplate, resin-encapsulated, identifying its date of manufacture, intended service, rated capacity, rated temperature, fabrication method and resin and reinforcement materials.

Each manhole structure shall also include a confined space hazard warning label, prominently visible on the top cover interior.

Each structure shall include an integral fiberglass ladder assembly, having non-slip rungs and fiberglass standoff brackets bonded to the inner surface of the structure.

2.04 Top Cover

The manhole top shall be provided with a reinforced concentric integral reducer section, designed for a cast iron ring and cover assembly (furnished by the installing contractor).

2.05 Anchorage

Each manhole structure shall be provided with laminated in place anchorage flange, designed to secure the structure to the concrete foundation. The attachment flange shall be suitable for resisting subsurface uplift forces following installation of anchor bolts, or concrete imbedment as furnished by the installing contractor.

2.06 Flow Measurement Primary Element (FLUME)

The flow measurement element (Flume) shall be of the type and size shown on the Plans. The flow directing surfaces of the flume shall be of a smooth white isophthalic gel coat for optimal corrosion resistance. The flumes structural layer shall be made of a glass reinforced polyester resin. The flume will be of an adequate thickness and reinforced as necessary to maintain accurate internal surface dimensions. The flume shall contain inlet and outlet adaptor sections, as required, and shall be laminated so as to become an integral part of the manhole structure.

If any portion of the flume structure extends beyond the manhole cylinder, the entire flume structure shall be designed with rib reinforcement and laminate composition to resist hydrostatic loading.

3.0 EXECUTION

3.01 Installation

All manhole structures shall be handled and installed in accordance with the Plans and the manufacturer's written instructions. Leveling of the structure shall be referenced to the leveling requirements for the flow measurement primary element.

All pipe and accessory connections shall be made, as shown on the Plans.

Foundation anchorage shall be installed in accordance with the manufacturer's recommendations.

3.02 Inspection

The Engineer will inspect each structure for defects, damage and Specification conformance. Should any defect become evident during testing or inspection, the Contractor shall arrange for prompt repair or product replacement at no cost to the Owner.