Revised Specification Sections.pdf

Solicitation W912WJ20B0010

Rehab Canal Gates Fox Point Hurricane Barrier, Providence, Rhode Island

AMENDMENT 0004

August 25, 2020

SPECIFICATION CHANGES

1. Amend Section 01 11 00 “SUMMARY OF WORK” as follows:

A. Under subparagraph 1.2 titled “WORK COVERED BY CONTRACT DOCUMENTS”, subparagraph 3, sentence 1, revise verbiage “new mounting plates and new stainless steel hardware,” to read “new mounting plates and new carbon steel hardware,...”

2. Amend Section 05 13 00 “REHABILITATE CANAL GATES” as follows:

A. Under Subpart “PART 2 PRODUCTS” remove verbiage from subpart in its entirety and replace it with the following:

2.1 CARBON GRADE STEEL

2.1.1 Carbon Steel Bars and Shapes

Carbon grade steel shall conform to ASTM A 36. Carbon grade steel shall be used for any seal components of the canal gates which may need replacing such as backer plates, retaining bars, and support bars.

2.2 STAINLESS STEEL

2.2.1 Stainless Steel Bars and Shapes

Stainless steel bars and shapes shall conform to ASTM A276/A276M, UNS S31603, Condition A, hot-finished or cold-finished. Stainless steel bars and shapes shall be used for any components of the canal gate wheel assembly which may need replacing such as the axle, retaining block, washer, and the two-piece collar.

2.2.2 Stainless Steel Castings

Stainless steel castings shall conform to ASTM A744/A744M, Grade CF8M, UNS J92900.

Stainless steel castings shall be used for the canal gate wheels.

2.3 CARBON STEEL BOLTS

Carbon steel bolts shall conform to ASTM A 307, Grade A with carbon steel nuts conforming to ASTM A 563, Grade A. Carbon steel bolts and nuts shall be used for all seal attachments made after the completion of the painting.

2.4 NUTS DIMENSIONAL STYLE

Carbon steel nuts shall be Hex Style when used with ASTM A 307 bolts.

2.5 WASHERS

Plain steel washers shall conform to ASTM F 844. Bronze washers shall be silicone bronze.

2.6 NICKEL ALUMINUM BRONZE

Bushings shall be nickel aluminum bronze in accordance with ASTM B271/B271M or ASTM B505/B505M, UNS C95800 (nickel aluminum bronze copper casting alloy), and per requirements in specified in Section 35 05 40.17 SELF-LUBRICATED MATERIALS, FABRICATION, HANDLING, AND ASSEMBLY.

2.7 WELDING

All welding shall be performed in accordance with AWS D1.1/D1.1M. Surfaces and edges to be welded shall be prepared in accordance with AWS D1.1/D1.1M. All welding shall be by an electric arc welding process using a method which excludes the atmosphere from the molten metal. The electrode, electrode-flux combination, and grade of weld metal shall conform to the appropriate AWS Specification for the base metal and welding process being used. All welds shall be prequalified as described in AWS D1.1/D1.1M, Subsection 5.1.

2.8 STRUCTURAL STEEL FABRICATION

Shop cutting of structural steel may be by mechanically guided or hand-guided torches, provided an accurate profile with a surface that is smooth and free from cracks and notches is obtained.

2.9 CANAL GATE SEALS

All of the canal gate rubber seals shall be replaced in-kind. Rubber seal dimensions and configurations shall be as shown in accordance with the details on Sheet 156 of the Information Drawings. The Contractor shall verify existing rubber seal dimensions prior to fabrication. The rubber seal compound shall be either natural rubber or neoprene and shall be molded only. The seals shall have molded corners and splices shall be vulcanized. The compound shall have no reclaimed polymers and include reinforcing carbon black, zinc oxide, accelerators, antioxidants, vulcanizing agents and plasticizers. The rubber seal profile shall be properly cured into a homogeneous form and kept free of oils, grease, or other materials which would deteriorate the rubber. Physical characteristics of the seals shall meet the following minimum requirements:

COMPOUND OPTIONS: Natural Rubber/Neoprene

TEST METHOD PHYSICAL TEST TEST

VALUE

SPECIFICATION

DUROMETER HARDNESS

(SHORE A)

60 - 70 ASTM D2240

TENSILE STRENGTH 2500 PSI (MIN) ASTM D412

ELONGATION AT BREAK 400%(MIN) ASTM D412

300% MODULUS 900 PSI (MIN) ASTM D412

COMPRESSION SET 30% (MAX) ASTM D395

METHOD B

WATER ABSORPTION

(NATURAL RUBBER AND

BLENDS - AGED THEN

IMMERSED AT 70 C FOR

166 HRS NEOPRENE -

AGED THEN IMMERSED AT

212 C FOR 22 HRS)

10% BY WEIGHT (MAX) ASTM D471

AGING : TENSILE

STRENGTH (48 HRS OF

AGING)

80% OF STRENGTH (MIN) ASTM A572/A572M

LOW TEMPERATURE

BRITTLENESS

NON BRITTLE

3' @ -40 C: Natural Rubber 3' @ -25 C: Neoprene

ASTM D2137METHOD A

B. Under Subpart “PART 3 EXECUTION” remove verbiage from subpart 3.2.2 in its entirety and replace it with the following:

3.2.2 Rubber Seals and Seal Retaining Bars

All rubber seals, seal retaining bars, and 5/8" diameter bolts attaching the seal retaining bars to the gates shall be replaced. The steel components of the seals shall be painted in accordance with Section 09 97 02 PAINTING OF CANAL GATES following the connection per the details shown on Sheet 156 of the Information Drawings.

PLAN CHANGES

1. S-601 – See updated S-601 – Work Schedule, which is attached under this amendment.