W9128F21R0005_Summary of Changes_Draft to Final Solicitation.pdf

USACE Omaha District: Ft Randall Major Unit Rehab W9128F21R0005

DRAFT to FINAL Solicitation Changes

SPEC SECTION: 01 22 00, para 1.2.77.1, line 9

Change:

DELETE “High Lift Pumps” two instances

ADD AND REPLACE WITH

“Jacking Control System”

SPEC SECTION: 26 05 00.00 26, paragraph 2.9 RTD ALARM/ TRIP MODULES

REMOVE

Maintenance Laptop

ADD

“Any software required shall be provided by the contractor and must run on Windows OS.”

SPEC SECTION: 09 97 02.00 26

Change:

Para 3.3 3 Paint Systems Application ADD paragraph 3.3.7 Phenicon HS Flake Filled

The coating system shall be applied according to the manufacturer's written instructions. It shall be a 2-coat system. All materials shall be procured from the same coating manufacturer. The individual paints comprising the system shall have been tested and passed all the requirements of the applicable SSPC standards. Application shall be by spray in accordance with the manufacturer's written instructions. Limited use of brush and roller application is permitted provided the specified film thicknesses are achieved. Dry film thickness per coat shall be that recommended by the manufacturer. Application of the system in less than two coats shall not be accepted. The coatings shall be mixed and thinned in accordance with the manufacturers written directions. Coating material that has exceeded the manufacturer's pot life shall not be applied. Materials that have thickened appreciably shall not be applied. The manufacturer's recommendations for minimum and maximum dry time between coats shall be met. Areas of bubbling noted upon curing of any individual coat shall be removed by sanding or screening. The edges of the repaired areas shall be feathered and the coat reapplied to the repaired areas before a subsequent coat is applied.

SPEC SECTION: 09 97 02.00 26, Paragraph 3.5 Painting Schedules, System No 23-C-Z

ADD exterior surface of the accumulator tanks;

ADD Phenicon HS Flake Filled

Items or surfaces to be coated: The interior surfaces of the accumulator tanks.

SURFACE

PREPARATION 1st COAT 2nd COAT

Per Manufacturer Phenicon HS Phenicon HS Recommendation Flake Filled Flake Filled

SPEC SECTION: 33 56 53.00 26, Para 1.2

Change: ADD ASME B40.100(2013) Pressure Gauges and Gauge Attachments

SPEC SECTION: 33 56 53.00 26, Paragraph 1.3 Submittals

Change: ADD On Site Inspection Report; G, HDC, OD-FR

SPEC SECTION: 33 56 53.00 26, para 1.4 Design and Performance Requirements

Change:

ADD

Reference drawings 195214A and 195215A show the original accumulator tanks that are to be replaced. Furnish the detailed design in accordance with ISO 4413, ASME BPVC SEC VIII D1, and the following design criteria. Identify design and dimensional changes necessary to satisfy the principal design parameters identified in the paragraph "Design Parameters" as variations in the submittals.

Dimensions submitted that differ from those indicated and not otherwise constrained by the Design Parameters and physical limitations of installation are subject to approval. Also submit design computations for all extension of design items.

SPEC SECTION: 33 56 53.00 26, para 1.4 Design and Performance Requirements

Change:

DELETE

1.4.2 Allowable Stresses

1.4.2.1 Accumulators

Design all accumulator tanks per ASME BPVC SEC VIII D1 to withstand a maximum operating pressure of 400 psi.

SPEC SECTION: 33 56 53.00 26, para 1.4 Design and Performance Requirements

ADD

1.4.2 General

Design the accumulators, fabricate, and test in accordance with ASME BPVC SEC VIII D1 for a rated working pressure of not less than 400 psi. Accumulators should be stamped and certified per ASME standards. The new tanks will interface with existing equipment, field verify all existing dimensions. To maintain the float valve set points the internal dimensions of the tank must remain the same as original and hold a minimum of 141 gallons. Match all connections points to include the oil pipes, pressure sensors ports, air connections, and oil level gauges. Existing , level sensor and float valve are to be reused. Pressure gauge, pressure relief valve, pressure relief valve check valve, air bleed valve and associated components are to be replaced with new.

SPEC SECTION: 33 56 53.00 26, para 1.5.1 Shop Drawings

Change:

DELETE

If departures from the Contract drawings are deemed necessary by the Contractor, submit details of such departures, including changes in related portions of the project and reasons, with the shop drawings.

SPEC SECTION: 33 56 53.00 26

Change:

DELETE

1.5.3 Delivery Drawings

Provide delivery [drawings][details][sketches]with descriptions of methods of delivering components to the site, including details for supporting fabricated components during shipping to prevent distortion or other damage.

SPEC SECTION: 33 56 53.00 26, para 1.5.3 Shop Assembly and Testing Procedures and Results

Change: ADD Perform all inspection and pressure testing per ASME BPVC SEC VIII D1.

SPEC SECTION: 33 56 53.00 26, para 1.5.5 Cleaning and Flushing Procedures and Results

Approved flushing fluids include unit oil Shell Turbo T68 or the approved oil per SECTION 41 67 13.12 26.Isolate the accumulator tank from other governor piping when performing the flush.

SPEC SECTION: 33 56 53.00 26, para 1.6 Quality Assurance

Change:

ADD

Submit On Site Inspection Report verifying as-built dimensions and features. All features and accessories including openings, equipment mounting supports, and locations/elevations of pipe inlets must duplicate the existing design. Discrepancies between information given in this document and information developed by the Contractor shall be brought to the attention of the Government before proceeding.

DELETE

And assembly of the hydraulic cylinders assemblies power units and manifolds.

Of the piping, hydraulic cylinder assemblies power units and manifolds, complete.

SPEC SECTION: 33 56 53.00 26, Part 2 Products

Change:

DELETE

2.1 Accumulators

Provide eight accumulators with the fluid capacity not less than 141 gallons. Design the accumulators, fabricate, and test in accordance with ASME BPVC SEC VIII D1 for a rated working pressure of not less than 400 psi. Accumulators should be stamped and certified per ASME standards. Equip accumulators with a safety device to release excessive pressure before the burst pressure is reached.

2.1.1 Existing Equipment

The new tanks will interface with existing equipment, field verify all existing dimensions. To maintain the float valve set points the internal dimensions of the tank must remain the same as original. Match all connections points to include the oil pipes, pressure sensors ports, air connections, and oil level gauges. Existing pressure gauge, level sensor and pressure relief valve are to be reused.

2.1.2 Seals

Install new seals and gaskets for all sealing surfaces.

ADD

2.1 STEEL PLATE AND PIPE

Steel plate and pipe used for the fabricated oil accumulators must conform to the requirements of ASME BPVC SEC VIII D1.

2.2 FASTENERS

All bolts, nuts, washers and threads must conform to the requirements of ASME BPVC SEC VIII D1.

2.3 SEALS

Seals and gaskets used for the fabricated oil accumulators must conform to the requirements of ASME BPVC SEC VIII D1.

2.4 PRESSURE GAUGE

Provide pressure gauges that conform to ASME B40.100 and the following requirements:

a. Case Material: Stainless steel or aluminum

b. Dial Arc: 270 Degrees

c. Case Diameter: 6 inches

d. Pressure Indication Range: 0 psi to 500 PSI

e. Additional Salient Features:

1. Solid front with blowout back

2. Accuracy of at least 1%

3. Black indication markings on a white dial face. 2 PSI graduations

Provide all necessary connections fittings. Use union fittings to position gauge vertically. Maintain the current elevation of the pressure gauge.

2.5 AIR BLOW OFF VALVE

Provide a manually operated reseatable type air blow-off valve for_ adjusting the air pressure in the tank. The air blow-off valve must be provided with a suitable exhaust muffler to reduce the sound level of the released air stream to a maximum of 70 decibels.

2.6 PRESSURE RELIEF VALVE

Provide a pressure relief valve conforming to ASME BPVC SEC VIII D1 and certified by the National Board Certified for Section VIII. Valve must be rated for air/liquid. Minimum adjustable range from 360-400 PSI.

SPEC SECTION: 33 56 53.00 26, Part 3 Execution

Change:

DELETE

3.1 EXAMINATION

After visiting the site and becoming thoroughly familiar with all details of the work and working conditions, verify dimensions in the field, and then advise the Contracting Officer of any discrepancies prior to performing any work. The Contractor is specifically responsible for the coordination and proper relation of the contracted work to the structure and work of all trades.

3.1 DISASSEMBLY AND FIELD MEASUREMENT

The existing oil accumulator tanks will be disassembled and disposed of by the contractor. The original pressure gauge, level sensor, float valve, and pressure relief valve are to be saved and installed on the new tank. Prior to submittal of the shop drawings, perform field measurements of existing accumulators to confirm as built conditions. All connection ports and obround manhole to duplicate original conditions.

SPEC SECTION: 33 56 53.00 26, para 3.1 Installation

Change:

DELETE

Install the equipment specified and as shown to complete accumulator tank replacement. Install hydraulic components in accordance with the manufacturer's written instructions and under the direction of the erection engineer or manufacturer's representative. Install complete units or assemblies without disassembly. Provide necessary supports for all appurtenances, pumps, motors, and other equipment or components as indicated. Anchor floor-mounted equipment to concrete pads by anchor bolts or expansion anchors as shown.

ADD

Install the equipment specified to be capable of performing all functions of the original accumulator. The assembly is to include the installation of all components removed from the original tank including pressure gauges, level sensors, float valve, and pressure relief valve. Anchor floor-mounted equipment to concrete pads by anchor bolts.

SPEC SECTION: 33 56 53.00 26, para 3.3 Cleaning and Flushing

Change:

DELETE

Use the same hydraulic fluid for flushing as approved for final filling. Include a detailed description of the equipment, materials, hydraulic fluid, temperatures, and duration of each phase of the flushing in the procedures.

ADD

After installation tanks must be thoroughly manually cleaned by the Contractor. The Contractor is to physically clean and wipe out all residues from the tanks using oil-absorbent and lint-free cloths to remove all visible dirt, varnish, and debris, to the point that no residual contamination can be detected on clean lint-free white cloths. Perform a displacement flush of all piping to remove contaminants which may have been introduced into the piping.

DELETE

3.3.1 Flushing Piping

Flush all hydraulic piping before installation of the hydraulic power unit, cylinders, and manifolds. Install by-pass loops of piping in place of cylinders, manifolds and the power units. Circulate hydraulic fluid through each and every pipe unit until returning oil meets the requirement for system cleanliness. Sequence flushing so that all piping is flushed in both directions. The flow capacity of the flushing system to produce a minimum velocity of or 15 feet per second in all piping. Provide means to verify the flow during the flushing operation.

3.3.2 Flushing Manifolds and Hoses After cleaning and prior to installation, flush each valve manifold, pipe manifold, and hose by circulating hydraulic fluid through all ports until the returning fluid meets the requirement for system cleanliness.

ADD

3.5 Spare Parts

Provide two spare pressure gauges, two spare, pressure relief valves, and two spare, air blow off valves.

SPEC SECTION: 00 21 00 1.15 b.

DELETE:

1.15

b. A site visit is scheduled for 03 December 2020 at 09:00 am.

Contractors interested in seeing the site need to make reservation with Mike Schenkel telephone (605) 487-7845 X 3003 or by e-mail at Michael.A.Schenkel@usace.army.mil. Contractors are to meet at Powerhouse.

ADD

1.15

(b) Site visit dates will be 12 and 13 Jan 2021 beginning at 09:00 AM. Contractors must provide a list of attendees and preferred date no later than 22 Dec 2020. Due to COVID 19 restrictions, potential bidders will be limited to a single day on site and the number of attendees may be restricted if necessary. Non-US citizen attendees must be identified to the Government NO LATER THAN 17 Dec 2020 to ensure prior approval is obtained. To facilitate the necessary travel arrangements, the approved site visit date will be provided by the Government to each contractor no later than 28 Dec 2020.

During the site visit one unit will be dewatered and penstock open for turbine inspection. The turbine maintenance platform will be installed.

The generator housing will be open with three upper hatches removed and will be available for inspection and measurements. The shrouds are far enough from the machine to allow an adult to easily sit upright with complete access to the full end windings, finger plates, and circuit rings around the entirety of the machine. Stator frame wrapper inspection covers will be removed. A radiator will be removed in the vicinity of a frame split. Spare parts (e.g., coils and stator laminations) are in a warehouse and may be brought to the powerhouse for inspection.

Contractors interested in attending the site visit must make reservation with and forward non-US Citizen requests to Robin Puskar by e-mail at Robin.L.Puskar@Usace.Army.Mil. Contractors are to meet at the Powerhouse on the assigned date.

SPEC SECTION: 00 22 00 11.1 Evaluation Method: Turbine Efficiency pg. 49

Factor 6 – Price will not be adjusted due to the efficiency value proposed.

SPEC SECTION: 00 22 00 8.1.8 and 8.1.9 pg. 43 & 44

CHANGE

Adjectival ratings updated to match language prescribed in the current FAR.

SPEC SECTION: 00 22 00 14. Volume 1 Factor 5- Small Business Participation Pg. 55

DELETE

Reference Paragraph 17, Utilization of Small Business Concerns for additional small business information.