Amendment_0001_W9128F-16-B-0015.pdf

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DEPARTMENT OF THE ARMY

Omaha District, Corps of Engineers 1616 Capitol Avenue Omaha, Nebraska 68102-4901 :NOTICE: Failure to acknowledge : Solicitation No. W9128F 16 B 0015 :all amendments may cause rejec- :

:tion of the bid. See FAR : Date of Issue: 05 August 2016 :52.214-3 of Section 00 21 00 : Date of Opening: 07 September 2016

Amendment No. 0001 11 August 2016

SUBJECT: Amendment No. 0001 to Specifications and Drawings for Construction of Penstock Unwatering Piping Rehab, Oahe Dam, SD Solicitation No. W9128F 16 B 0015.

TO: Prospective Bidders and Others Concerned

1. The specifications and drawings for subject project are hereby modified as follows (revise all specification indices, attachment lists, and drawing indices accordingly).

a. Specifications (New and/or Revised and Reissued). Delete and substitute or add specification pages as noted below. The substituted pages are revised and reissued with this amendment.

Pages Deleted Pages Substituted or Added

SECTION 01 45 00.10 10 ----

QUALITY CONTROL SYSTEM (QCS)

SECTION 05 50 15 SECTION 05 50 15

CIVIL WORKS FABRICATIONS CIVIL WORKS FABRICATIONS

b. Drawings (Not Reissued). The following drawings are revised as indicated below with latest revision date of 11 August 2016. These drawings are not reissued with this amendment.

(1) Sheet M-002, Note 4, add the following sentence to existing note: “Pipe to remain on concrete supports and shall not be lifted, blast and paint only the exposed portions of the pipe.”

(2) Sheet M-002, Note 5, add the following sentence to existing note: “Existing pipe is cast iron with 125lb flanges, replace portion of pipe and flange to be replaced with ductile iron pipe, existing dresser coupling to be replaced with appropriate coupling to accommodate new pipe.”

2. This amendment is a part of the bidding papers and its receipt shall be acknowledged on the [new] Standard Form 1442. All other conditions and requirements of the specifications remain unchanged. If the bids have been mailed prior to receiving this amendment, you will notify the office where bids are opened, in the specified manner, immediately of its receipt and of any changes in your bid occasioned thereby.

a. Hand-Carried Bids shall be delivered to the U.S. Army Corps of Engineers, Omaha District, Contracting Division, 1616 Capitol

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Avenue, Omaha, Nebraska 68102-4901.

b. Mailed Bids shall be addressed as noted in Item 8 on Page 00 10 00-1 of Standard Form 1442.

3. Bids will be received until 2:00 p.m., local time at place of bid opening, 07 September 2016.

Attachments: Spec Pages listed in 1.a. above

U.S. Army Engineer District, Omaha Corps of Engineers 1616 Capitol Avenue Omaha, Nebraska 68102-4901

11 August 2016

MFS/2184

Rehab Penstock Dewatering Piping in Shale Drain Tunnel, Oahe Dam OA77

SECTION TABLE OF CONTENTS

DIVISION 05 - METALS

SECTION 05 50 15

CIVIL WORKS FABRICATIONS

08/08

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 QUALITY ASSURANCE

PART 2 PRODUCTS

2.1 Steel Tubing

2.2 Pipes

2.3 Pipe Fittings

2.3.1 Valves

2.3.1.1 Flexible Couplings

2.4 Bolts, Nuts, and Washers

2.4.1 High-Strength Bolts, Nuts, and Washers

2.4.2 Bolts, Nuts, and Washers (Other Than High-Strength)

PART 3 EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

3.2 Piping Shields

3.3 Steel Piping

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CIVIL WORKS FABRICATIONS

08/08

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO HB-17 (2002; Errata 2003; Errata 2005, 17th Edition) Standard Specifications for Highway Bridges

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2010) Structural Welding Code - Steel

ASME INTERNATIONAL (ASME)

ASME B16.3 (2010) Malleable Iron Threaded Fittings, Classes 150 and 300

ASME B16.5 (2009) Pipe Flanges and Flanged Fittings:

NPS 1/2 Through NPS 24 Metric/Inch Standard

ASME B16.9 (2007) Standard for Factory-Made Wrought Steel Buttwelding Fittings

ASME B18.2.1 (2010) Square and Hex Bolts and Screws (Inch Series)

ASME B18.2.2 (2010) Standard for Square and Hex Nuts

ASME B18.21.1 (2009) Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)

ASTM INTERNATIONAL (ASTM)

ASTM A325 (2010) Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

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SD-02 Shop Drawings

Miscellaneous Metals & Standard Metal Articles; G

SD-03 Product Data

Miscellaneous Metals & Standard Metal Articles; G

SD-04 Samples

Miscellaneous Metals & Standard Metal Articles; G

SD-06 Test Reports

Miscellaneous Metals & Standard Metal Articles; G

1.3 QUALITY ASSURANCE

a. Miscellaneous metalwork shall be well formed to shape and size, with sharp lines and angles and true curves. Drilling and punching shall produce clean true lines and surfaces. Provide exposed surfaces of work in place with a smooth finish, and unless otherwise approved, flush exposed riveting. Where tight fits are required, mill joints.

Cope or miter corner joints, well formed, and in true alignment.

Accurately set work to established lines and elevations and securely fastened in place. Install in accordance with manufacturer's installation instructions and approved drawings, cuts, and details.

b. Perform welding continuously along the entire area of contact except where tack welding is permitted. Do not tack weld exposed connections of work in place. Grind exposed welds smooth.

c. Qualify welders, perform welding, welding inspection, and corrective welding, in accordance with AWS D1.1/D1.1M. GRIND VISIBLE WELDS SMOOTH IN THE FINISHED INSTALLATION. Use procedures, materials, and equipment of the type required for the work.

PART 2 PRODUCTS

2.1 Steel Tubing

2.2 Pipes

ASTM A53/A53M, Type E

2.3 Pipe Fittings

a. Flanged - ASME B16.5, Class 125, faced and drilled.

b. Screwed - ASME B16.3,

c. Butt-welding - ASME B16.9.

2.3.1 Valves

Valves shall be class 150- B NSF Certified 20 inch butterfly type with hand wheel operator. All butterfly valves shall be for shutoff of clean water.

They shall meet or exceed AWWA Standard C504 and C516. Valve ends shall be

SECTION 05 50 15 Page 3 flanged. Valves to be of offset disc design, corrosion resistant shaft with stainless steel disc edge and have self-compensating shaft seals.

2.3.1.1 Flexible Couplings

Couplings shall be 20 inch Style 38 Dresser Couplings for Steel Pipes or equal. Middle ring thickness shall be .250 in., length of middle ring shall be 7 inches. Bolt diameter 5/8 inch, bolt length 10 3/4 inch.

Gasket material shall be Buna N.

2.4 Bolts, Nuts, and Washers

Bolts, nuts, and washers shall be of the material, grade, type, class, style and finish indicated or best suited for intended use.

2.4.1 High-Strength Bolts, Nuts, and Washers

a. ASTM A325, Type Stainless Steel,

b. Meet the requirements of Section 11 of AASHTO HB-17 for Slip Critical Connections. Conduct Rotational-capacity testing for all fastener assemblies. Test as an assembly each combination of bolt production lot, nut lot, and washer lot. Assign a rotational-capacity lot number to each combination of lots tested. Test bolts in a Skidmore-Wilhelm Calibrator or an acceptable equivalent device.

2.4.2 Bolts, Nuts, and Washers (Other Than High-Strength)

a. Bolts and Nuts - ASTM A320/A320M, Stainless Steel

b. Bolts - ASME B18.2.1.

c. Nuts - ASME B18.2.2.

d. Washers

(1) Plain Washers - ASME B18.21.1, Type B.

(2) Lock Washer - ASME B18.21.1.

PART 3 EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

Install items at locations indicated, according to manufacturer's instructions. Verify all measurements and take all field measurements necessary before fabrication. Valves and flexible couplings located on each riser shall be completed one at a time and will require the penstock to be dewatered during replacement. It takes approximately 24 hours to completely pump the penstock dry. Powerhouse personnel will dewater the penstock and enure it is empty prior to removal of the valve and coupling.

Powerhouse personnel will issue a clearance to the unit and the contractor will be required to sign the clearance and provide a lock to place on the lock box. Once the clearance is issued the contractor will have 5 working days to remove and replace the flexible couplings and butterfly valve. Only one penstock will be dewatered at a time, after one riser is complete the penstock will be refilled and the next one drained.

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3.2 Piping Shields

The piping shields on each riser shall be removed and cleaned. The downspouts will be replaced with 1 inch flexible PVC vinyl tubing and secured with a new clamp. All fasteners shall be replaced and shall be stainless steal. After the piping is painted the shields shall be replaced and secured to provide a continuous seal around the piping to divert any leakeage into the shields and down the tubing. Provide anchorage where necessary for fastening miscellaneous metal items securely in place.

Include for anchorage not otherwise specified or indicated slotted inserts, expansion shields, and powder-driven fasteners, when approved for concrete;

toggle bolts and through bolts for masonry; machine and carriage bolts for steel; through bolts, lag bolts, and screws for wood. Do not use wood plugs in any material. Provide non-ferrous attachments for non-ferrous metal. Make exposed fastenings of compatible materials, generally matching in color and finish, to which fastenings are applied. Conceal fastenings where practicable.

3.3 Steel Piping

The existing twenty inch steel piping to be removed is cast iron. There is approximately 17 feet of corroded pipe to be removed and replaced. One end of the piping has a 125lb flange and other is joined to the adjacent piping via a flexible coupling. The new pipe shall be ductile iron with a flanged end and attached via flexible coupling to the existing pipe. The contractor shall provide all necessary hardware and gaskets to make the connections. All piping and other fittings will be raised and lowered using the two ton crane in the pumphouse, care shall be taken to not overload the crane.

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