1043ADJUSTING RINGS

1043.01 Reserved.

1043.02 High Density Polyethylene (HDPE) Plastic Adjusting Rings. HDPE

plastic adjusting rings shall be manufactured from Class B HDPE plastic, as identified in ASTM D 1248, using the injection molding process. They shall be designed and tested to meet or exceed an HS25 wheel load according to the AASHTO Standard Specifications for Highway Bridges and shall be stabilized against the effects of ultraviolet light. Recycled material may be used. If recycled material is used, only polyethylene and less than two percent polypropylene will be allowed in the reclaim process. All feed stock shall be tested by the manufacturer on a procurement/production batch basis to verify the following property values. Physical Property Test Standard Value Melt Flow Index ASTM D 1238 0.01 to 1.06 oz/10 min (0.30 to 30.0 g/10 min) Specific Gravity ASTM D 792 0.84 to 0.98 Tensile Strength, Yield ASTM D 638 2000 psi (13,800 kPa) minimum HDPE plastic adjusting rings shall have no void areas, cracks, or tears, and have no effects due to exposure to ultraviolet light. Ripples or sags shall be limited to less than ten percent of the surface. The actual diameter or length shall not vary more than 0.125 in. (3 mm) from the specified diameter or length. Variations in height are limited to  0.063 in. (1.6 mm) for parts up to 2 in. (50 mm) or  0.125 in. (3 mm) for parts from 2 in. (50 mm) to 3 in. (75 mm). Variations shall not exceed 0.25 in. (6 mm) from flat (dish, bow or convoluting edge) or 0.125 in. (3 mm) for bulges or dips in the surface.

1043.03 Recycled Rubber Adjusting Rings. Recycled rubber products shall

consist of no less than 80 percent by weight recycled rubber. The riser shall meet or exceed the following when maintained at 73 ± 3 °F (23 ± 2 °C) for at least 24 hours prior to and during testing. Adjusting Rings Art. 1043.04 Physical Property Test Standard Value Density ASTM C 642 68.63 ± 2.11 lb/cu ft (1.10 ± 0.034 g/cu cm) Durometer Hardness ASTM D 2240 Shore A 72 ± 6 1/ Compression Deformation under 145 psi (1000 kPa) ASTM D 575 –Test Method B Test of Specified Force 9 ± 4 % Compression Set ASTM D 395 – Illinois Modified Test Method B Compression Set under Constant Deflection in Air 5 ± 3 % 2/ Weathering (70 hrs at 158 °F (70 °C)) Hardness retained ASTM D 573 98 %, minimum Freeze/thaw when exposed to deicing chemicals ASTM C 672 3 % loss, maximum 1/ Average of three tests over a 1.12 in. (28 mm) diameter sample. 2/ Samples compressed to 75 percent of initial height. Recycled rubber adjusting rings shall have no void areas, cracks, or tears, and have no defects due to exposure to ultraviolet light. The actual diameter or length shall not vary more than 0.125 in. (3 mm) from the specified diameter or length. Variations in height are limited to  0.063 in. (1.6 mm) for parts up to 2 in. (50 mm).

1043.04 High Density Expanded Polystyrene Adjusting Rings with

Polyurea Coating. High density expanded polystyrene adjustment rings with polyurea coating shall be designed and tested to meet or exceed an HS25 wheel load according to the AASHTO Standard Specifications for Highway Bridges (AASHTO M306 HS-25). The raw material suppliers shall provide certifications of quality or testing using the following ASTM standards, and upon request, certify that only virgin material was used in the manufacturing of the expanded polystyrene rings. Physical Property Test Standard Value 3.0 lb/cu ft 4.5 lb/cu ft Compression Resistance at 10% deformation at 5% deformation at 2% deformation ASTM D 1621 50 - 70 45 - 60 15 - 20 70 - 90 60 - 80 20 - 40 Flexural Strength ASTM D 790 90 - 120 130 - 200 Water Absorption ASTM D 570 2.0% 1.7% Coefficient of Linear Expansion ASTM D 696 2.70E-06 in./in./ ⁰F 2.80E-06 in./in./⁰F Sheer Strength ASTM D 732 55 80 Tensile Strength ASTM D 1623 70 - 90 130 - 140 Water Vapor Transmission ASTM C 355 0.82 – 0.86 perm – in. Art. 1043.05 Flap Gate High density expanded polystyrene adjustment rings with polyurea coating shall have no void areas, cracks, or tears. The actual diameter or length shall not vary more than 0.125 in. (3 mm) from the specified diameter or length. Variations in height are limited to ± 0.063 in. (± 1.6 mm). Variations shall not exceed 0.25 in. (6 mm) from flat (dish, bow, or convoluting edge) or 0.125 in. (3 mm) for bulges or dips in the surface.

1043.05 Expanded Polypropylene (EPP) Adjusting Rings. The EPP

adjusting rings shall be manufactured using a high compression molding process to produce a minimum finished density of 7.5 lb/cu ft (120 g/l). The EPP rings shall be made of materials meeting ASTM D 3575 and ASTM D 4819-13. The grade adjustments shall be designed and tested according to the AASHTO Standard Specifications for Highway Bridges (AASHTO M 306 HS-25). Grade rings shall contain upper and lower keyways (tongue and groove) for proper vertical alignment and sealing. The top ring, for use directly beneath the cast iron frame, shall have keyways (grooves) on the lower surface with a flat upper surface. Adhesive or sealant used for watertight installation of the manhole grade adjustment rings shall meet ASTM C 920, Type S, Grade NS, Class 25, Uses NT, T, M, G, A, and O. EPP adjustment rings shall have no void areas, cracks, or tears. The actual diameter or length shall not vary more than 0.125 in. (3 mm) from the specified diameter or length. Variations in height are limited to ± 0.063 in. (± 1.6 mm). Variations shall not exceed 0.25 in. (6 mm) from flat (dish, bow, or convoluting edge) or 0.125 in. (3 mm) for bulges or dips in the surface. SECTION 1044. FLAP GATE

1044.01 Cover. The cover shall be cast iron, ASTM A 126, Class B, with

necessary reinforcing ribs. It shall be fabricated with a lifting eye for manual operation, and with bosses to provide a pivot point connection with the links. Bosses shall be designed to place the hinge bolt in double shear when the gate is assembled. Pivot bosses shall be designed to limit the double hinge action, preventing the cover from rotating sufficiently to become wedged in the open position.

1044.02 Frame. The one-piece cast iron frame shall be according to

requirements of ASTM A 126, Class B. The frame shall have a raised section around the perimeter of the waterway opening to provide the seating face. The raised section shall provide a seating plane diverging, top to bottom, from the plane of the mounting flange to assist in a positive closure of the cover. The frame shall be flat back or spigot back as designated on the plans. The spigot back gates shall be designed for attaching to corrugated steel pipe.