33 05 77 Packaged Metering Manhole.pdf

33 05 77 - PACKAGED METERING MANHOLES

Herbert, Rowland & Grubic, Inc. 33 05 77 - 1 005153.0436

SECTION 33 05 77 - PACKAGED METERING MANHOLES

PART 1 – GENERAL

1.1 SUMMARY

A. Summary:

1. Supply all labor, materials, equipment, and incidentals required to install and place into operation the proposed Influent metering manhole and the proposed Effluent Metering manhole as shown on the Drawings and as specified herein.

B. REFERENCE SPECIFICATIONS, CODES, AND STANDARDS:

1. AASHTO H-20 – Axial Loading.

2. ASTM C581 – Standard Practice for Determining Chemical Resistance of

Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service.

3. ASTM D256 – Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics.

4. ASTM D638 – Standard Test Method for Tensile Properties of Plastics.

5. ASTM D785 – Standard Test Method for Rockwell Hardness of Plastics and

Electrical Insulating Materials.

6. ASTM D790 – Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials.

7. ASTM D 2563 – Standard Practice for Classifying Visual Defects in Glass-

Reinforced Plastic Laminate Parts.

8. ASTM D2583 – Standard Test Method for Indentation Hardness of Rigid Plastic by Means of a Barcol Impressor.

9. ASTM D2584 – Standard Test Method for Ignition Loss of Cured Reinforced

Resins.

10. ASTM D3753 – Standard Specification for Glass-Fiber-Reinforced Polyester

Manholes and Wetwells.

11. ASTM D 1941 – Standard Test Method for Open Channel Flow Measurement of

Water with the Parshall Flume.

12. ISO 9826 – Measurement of Liquid Flow in Open Channels – Parshall and SANIIRI

Flumes.

13. JIS B7553 – Parshall Flume Type Flowmeters.

14. All references shall be of the latest revision.

1.2 SUBMITTALS

A. Units:

1. All submittals, specifications, drawings, brochures, installation instructions, descriptive literature, etc. shall have all units of measurement in both Imperial and SI units.

2. Drawing:

a. Project specific drawings, showing:

b. Overall structure length, width, and height.

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c. Critical elevations.

d. Ladder, top, coupling, and primary device orientations.

e. Joints, connections, fasteners.

f. Sizes, spacing, and locations of structural members, ribs, anchoring clips, and dimensional bracing.

g. Materials and thicknesses of construction.

h. Minimum and maximum flow rates.

i. Generic layouts or check-marked brochures shall be rejected without review.

1.3 SPECIFICATIONS

A. Project specific specifications:

1. Generic or check marked specifications shall be rejected without review.

B. Discharge Tables:

1. Primary device level-to-flow discharge tables, showing:

2. Flow equations.

3. Submergence transition, where published.

4. Accuracy, where published.

5. Plan view layout showing critical dimensions and primary point of measurement (Ha).

C. Discharge table source:

1. Receiving, Handling, and Storage Instructions.

2. Installation Instructions.

3. Operation and Maintenance Instructions.

4. Product Warranty.

D. Test Data:

1. Manhole.

2. Test result data confirming full compliance with ASTM D3753 for manhole barrel and reducer structures as required under Section 11 of the standard.

3. Flume.

E. Test results confirming flume material properties:

1. Laminate Sample.

2. 6-inch [15.24 cm] square samples of representative manhole barrel and flume laminates, upon request.

1.4 RECEIVING, HANDLING, AND STORAGE

A. Receiving:

1. Inspect for damage.

2. All parts should be inspected upon delivery to the site, noting any missing items or visible damage.

3. Verify that the interior flume flow surfaces have not been damaged or otherwise marked during transit.

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4. End connections, couplings, base mounting flange, and top should also be inspected.

5. For smaller boxed items make sure to verify that all packaging seals are in place and that there is no visible damage to the packaging.

6. Investigate for order correctness and count.

7. Once the order has been received review the packing list against what has been received. Should any items not appear to be present or the configuration of the items does not match the description on the packing list, contact Open channel flow immediately.

8. Small connection hardware (nuts, bolts, etc.) not attached to the manholes ship inside the manhole in individual boxes – with those contents clearly marked. Special care should be taken to secure these and any other small items that can be misplaced on a job site.

B. Handling:

1. Packaged Metering Manholes are specialty items and are fabricated to strict dimensional tolerances. While rugged and designed for a long service life, Packaged Metering Manholes must be handled with care. In particular, the flume flow surfaces are particularly important and in handling Packaged Metering Manholes this should always be kept in mind.

2. When cranes, hoists, and other machinery are used to lift manholes or manhole sections, spreader bars and lifting straps should always be used. When performing any overhead lift, all lifting eyes must be used in conjunction with good rigging practices. Rigging and lifting sequences and schedules of equipment are solely the responsibility of the installing party.

3. Taglines should be used to control the movement of the structure during lifting.

4. Manholes must be lifted by using nylon or similar fabric slings or lifting lugs, if furnished on the unit. Chains, ropes, and the like should never be used to move or position any fiberglass item as they may serrate the fiberglass laminate or compromise the protective gel coat surfaces.

5. Manholes should never be dropped, rolled, slid, or impacted.

C. Storage:

1. Manholes not intended for immediate installation may be stored until the site is ready for their installation.

2. Manholes should only be stored in a location that is clean, level, free of sharp objects and protected from construction traffic.

3. When shipped on pallets, manholes should be left on those pallets until such time as they are needed. Care should be taken to ensure that the base flange and end connections are protected from damage. Tarp or cover any manhole to be stored for an extended period of time before installation.

4. Chocks and / or tie downs should be used to prevent rolling or movement due to wind.

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1.5 MANUFACTURER:

1. Supply Packaged Metering manholes as manufactured by:

a. Plasti-Fab / Ershigs, Inc.

b. Open channel flow.

c. Or equal.

1.6 SUBSTITUTIONS:

1. Manufacturers wishing consideration as acceptable substitutes must follow the steps outlined below.

2. Include a copy of this specification section with all applicable plans sheets / details, addendum updates, and all referenced / applicable sections.

3. Each paragraph must be check marked to indicate complete compliance with the specification or clearly marked to indicate a request for deviation from the specification requirements:

a. Use check marks (✔) to denote full compliance with a paragraph as a whole. If deviations from the specifications are indicated and, therefore requested, underline each deviation and denote by a number in the margin to the right of the identified paragraph.

b. The remaining portions of the paragraph not underlined will signify compliance on the part of the Manufacturer with the specifications.

c. Include a detailed, written justification for each numbered deviation.

d. Failure to comply with the above is sufficient cause to summarily reject the entire request for substitution.

4. Requests for substitution must be made in writing and be received by the engineer’s office a minimum of ten (10) business days before the bid opening.

5. Manufacturers not pre-approved shall not be given consideration.

6. Manufacturers requesting pre-approval must have been regularly engaged in the application, design, and manufacturing of open channel primary devices for at least ten (10) years.

7. To ensure strict quality control, the Manufacturer may incorporate raw Materials from outside vendors, but the Manufacturer must fabricate the final product.

8. Job shopping or outside fabrication / sourcing shall not be acceptable.

9. In addition, the request for substitution must provide information regarding a minimum of ten (10) comparable North American installations, including:

i. Owner’s name, location, and contact information.

ii. Application and performance specifications.

iii. Date of installation.

iv. Operational history.

v. Equipment arrangement, including configuration and materials of construction.

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1.7 WARRANTY:

1. Packaged Metering Manholes shall be warranted to be free of defects in workmanship and materials for five (5) years with a completed warranty registration.

2. The warranty period shall begin from the date of acceptance.

1.8 SYSTEM DESCRIPTION

A. Configuration:

1. Packaged Metering Manholes shall be watertight, corrosion resistant units consisting of (as a minimum): manhole barrel, top, confined space entry warning sign, coupling, flume with end adapters, end connections (pipe stubs / flanges / caulking collars), base, and mounting flange.

Diameter:

2. Effluent Metering manhole:

a. 60-inches [1.22 m] I.D.

b. Inside diameter tolerance: +/- 1%.

Top style:

1. H-20 traffic.

2. Reducer:

a. A purpose-built fiberglass reducer cone providing a bearing surface for grade rings and frame / cover system, designed and tested to meet or exceed AASHO H-20 wheel loading (minimum 16,000 pounds [7,257 kg] vertical dynamic wheel load).

b. Reducer shall be factory joined to the manhole barrel with resin and glass fiber reinforcement to provide a monolithic, waterproof unit.

c. The reducer opening shall be:

(i) Ø48-inch [121.9 cm] manholes:

3) Concentric Ø31 3/4-inch [80.65 cm].

Height:

1. The manhole shall set to the appropriate height based on the contract drawings and have the following requirements:

a. H-20 traffic reducer style:

(i) Manhole reducer shoulder, typically 12-inches [30.48 cm] below surface grade to allow for the installation of the grade rings, frame, and cover.

(ii) Construction.

(iii) One-piece construction.

(iv) Flume.

(v) Single flume.

b. Size:

(vi) 3-inch Parshall flume.

B. Materials of Construction

A. Manhole:

1. Fiberglass reinforced plastic laminate composed of:

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a. Unsaturated, single lot, isophthalic polyester resin with U.V.

inhibitors

b. E-glass reinforcement.

c. Chemically enhanced silica for improved corrosion resistance, strength, and overall performance.

d. Wall thickness shall be sufficient to meet or exceed ASTM

D3753.

2. Interior :

a. Smooth, resin rich, corrosion resistant to minimize sludge build-up.

b. Naturally light tan with no added pigments to aid in the visual inspection of the manhole barrel laminate for resin odd-lotting and the inclusion of any voids, contaminants, etc.

c. Free of exposed fibers, crazing, delamination, blisters larger than Ø1/2-inch [1.27 cm], and wrinkles with a depth of 1/8-inch [0.3175 cm] or greater.

d. Pigments or gel coating of the interior manhole surface violated ASTM D3753 and are not allowed for any reason.

3. Exterior:

a. Gray 15 mil (cured) gel coat with U.V. inhibitors on all exterior surfaces.

b. Patterned / rolled glass exterior surface with no exposed fibers, sharp projections, or blisters larger than Ø1/2-inch [1.27 cm].

c.

4. Sign:

a. A self-adhesive polyester “Confined Space Entry” sign on the manhole interior.

b. Sign to comply with ANSI Z535.2 and OSHA 1910.145.

5. Coupling:

a. Ø2-inch [5.08 cm] FNPT fiberglass coupling for power, sampling, sensor, or other cabling laminated to the manhole barrel.

(i) Thru-wall fittings are not acceptable.

6. Ladder:

a. Stainless steel ladder support brackets thru-bolted and laminated outside to the manhole barrel.

b. Ladder rungs:

(i) Pultruded fiberglass 18-inches [45.72 cm] wide x Ø1 1/2-inches [3.81 cm] x 1/4-inch [0.635 cm] thick.

(ii) Reinforced with Ø1/4-inch [0.635 cm] threaded stainless steel rod secured by solid pultruded fiberglass spacers.

(iii) Spaced no more than 12-inches [30.48 cm] on center

(iv) Each rung shall have either an integrally molded non-slip surface or a full width, factory applied, coarse grit surface with a minimum dry coefficient of friction of 1.0.

(v) At the first ladder rung there shall be a fixed open cell grating platform to aid in entering / exiting the manhole

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(domed, aluminum hatch, and Ø48-inch [121.9 cm] manholes).

c. All manholes with 36-inches [91.44 cm] or more of depth between the top of the flume and the top reference elevation of the manhole (manhole top – domed, hatch surround -aluminum hatch, reducer shoulder – H-20) shall be equipped with a factory installed ladder.

d. Ladders shall meet OHSA 1910.27 for fixed ladders.

7. Base:

a. The manhole base shall be not less than 3/4-inch [1.905 cm] thick.

8. Mounting flange:

a. 4-inch [10.16 cm] wide x 3/4-inch [1.905 cm] thick integrally molded around the circumference of the manhole barrel for anchoring the manhole to the concrete pad.

9. Pad:

a. Customer to supply expanded polystyrene bead board for placement between the base of the manhole and the concrete slab:

(i) Flume, end adapters, and pipe stubs.

(ii) Fiberglass reinforced plastic laminate.

(iii) ISO certified polyester laminating resin.

(iv) Low HAP.

(v) Properties shall meet or exceed.

(vi) Tensile Strength (ASTM D638) 14,000 psi [96.53 MPa].

(vii) Flexural Strength (ASTM D790) 22,000 psi [151.7 MPa].

(viii) Flexural Modulus (ASTM D790) 900,000 psi [6.205

GPa].

(ix) ANSI/AWWA F101 Type II.

(x) Barcol Hardness (ASTM D2583) 30.

(xi) Water Absorption (ASTM D2583) <0.15%.

(xii) Allowable Defects (ASTM D2563) Level I.

b. E-glass:

(i) Minimum of 30% of laminate content by weight.

(ii) Silane coupling agent.

(iii) C-glass shall not be allowed.

c. Gel coat:

(i) 15 mil cured thickness.

(ii) U.V. inhibitors in all gel coat formulations, regardless of application or installation location.

(iii) Color:

(iv) Interior surfaces: white gloss.

d. Covers:

f. Integral fiberglass covers with a minimum total thickness of 1

1/4-inches [3.175 cm] over those portions of the flume or end adapters extending outside the manhole barrel to form a

Herbert, Rowland & Grubic, Inc. 33 05 77 - 8 005153.0436 watertight structure capable of meeting the manhole burial depth.

1.9 FLUME ACCESSORIES

A. End Connections.

B. End adapters:

1. Inlet end adapter to transition the flow into the flume, with pipe stubs of the appropriate size based on the contract drawings

2. Outlet end adapter to transition the flow out of the flume, with pipe stubs of the appropriate size based on the contract drawings

1.10 Flow / Level Options

A. Staff / level gauge:

1. High visibility, direct read level gauge with 3/4-inch [1.095 cm] black letters / numerals on a high visibility yellow-green background.

2. Dual scale gradated in cm, 1/10-foot, and 1/100-foot increments.

B. Ultrasonic mounting bracket:

1. Horizontally and vertically adjustable T-304 stainless steel construction.

2. Capable of simultaneously mounting ultrasonic transducers up to Ø1-inch [2.54 cm] NPT and temperature sensors up to Ø1-inch [2.54 cm] NPT.

1.11 FIELD ASSISTANCE

A. Qualified factory representative shall provide on-site assistance, consisting of:

1. 1 days of installation observation.

2. Factory representative shall complete a Certification of Installation Observation.

3. Installation observation shall not alleviate installing party from proper installation liability.

4. 1 day of operator training.

1.12 EXECUTION

A. Examination:

1. Verify that the manhole dimensions are correct and that the site conditions are suitable for installing the structure.

B. Installation:

1. The site must be of adequate size to accommodate the manhole and provide safe working room for the installing personnel.

2. Do not allow groundwater or surface water runoff to accumulate in the open excavation.

3. Provide a concrete foundation slab on which to mount / secure the manhole.

The slab should extend a minimum of 12-inches [30.48 cm] on all sides beyond the manhole, base mounting flange, connecting pipes / flanges, and any structure integrated into the manhole.

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C. The thickness of the slab should be a minimum of 6-inches [15.24 cm], but as local soil conditions may vary, the final design of the slab and anchoring details are the responsibility of the installing party and must be sized so as to prevent shifting and flotation of the manhole structure.

D. The concrete foundation slab must have a smooth, troweled surface to provide uniform support over the entire base structure. The slab must be level in both directions to within 1/8-inch [0.3175 cm] and free from exposed aggregate and debris.

E. Place the foam pad on the concrete slab where the manhole barrel will rest.

F. Lower the manhole onto the concrete slab – taking particular care to secure the manhole from overturning during movement and lowering.

G. Manholes supplied with pipe stubs may also be supplied with flexible couplings and stainless steel bands. Considerable force must be exerted by the coupling sealing surfaces during installation, if the coupling installs with little effort or appears loose, stop and contact the coupling manufacturer.

H. Place the flexible couplings (when provided) on the manhole pipe stubs.

I. Loosely secure the manhole to the concrete slab with anchor bolts (by others – wedge style recommended).

J. Level the manhole so that the floor of the flume (the crest) is level from front-to-back and from side-to-side (using a level on the crest – not the top – of the flume).

K. Once the flume level has been verified, complete the tightening of the anchor bolts to secure the manhole to the concrete slab.

L. Complete the connection of the manhole to the inlet / outlet piping.

1.13 Backfilling

A. Backfill should be placed evenly around the manhole in lifts of no more than 12-inches [30.48 cm]. Care should be taken to ensure that no void area exist between the concrete slab and any portion of the structure (i.e. under the flume, pipe connections, etc.).

B. Fill material should be imported sand or pea gravel material (naturally round aggregate

1/4-3/8-inch [0.635-0.9525 cm] in size).

C. If backfilling with another material avoid rocks, concrete, or soil lumps larger than 1-inch

[2.54 cm] in size.

1.14 Manhole Shoulder

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A. Inside the manhole there are void spaces between the interior of the manhole barrel and the exterior of the flume. These void spaces should be filled with supporting material to the top of the structure so that water does not collect. Sulfate resistant grout capping pea gravel or compacted sand is typical.

B. The internal dimensions of the flume are critical to its proper operation. The flume must be braced internally (plywood and lumber are typically used) during installation to ensure that distortion does not occur. The dimensional bracing on the top of the flume is provided to ensure dimensional accuracy. The bracing should be left on the flume until the installation has been completed.

C. The finished surface or shoulder of grout should be even with the top of the flume and should be sloped towards the flume so that any overflow will drain back into the flume.

D. Adjust and Clean:

1. Verify that the complete installation meets the criteria above and any additional criteria supplied by the Engineer.

2. Clean the flow surfaces in accordance with the manufacturer’s operation and maintenance instructions.

3. Remove all trash and debris, leaving the site in a clean condition.

END OF SECTION