Am0004.pdf

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing items 8 and 15, and returning or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

E. IMPORTANT: Contractor is not is required to sign this document and return copies to the issuing office.

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NUMBER 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQUISITION NUMBER 5. PROJECT NUMBER (If applicable)

7. ADMINISTERED BY (If other than Item 6) CODE

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION NUMBER

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended. is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NUMBER AS DESCRIBED IN ITEM 14.

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15C. DATE SIGNED

15A. NAME AND TITLE OF SIGNER (Type or print)

16C. DATE SIGNED

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

PAGE OF PAGES

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

Previous edition unusable

Amendment No. 0004

Rehab Powerhouse Bridge Cranes, Oahe Dam, SD

See attached documentation for content of the amendment revisions

Date for receipt of Proposals is 07 September 2017 at 2:00 pm

Government Point of Contact: Patrick Mally (402) 995-2070

U.S ARMY CORPS OF ENGINEERS, OMAHA DISTRICT

CONTRACTING OFFICE

1616 CAPITOL AVE.

OMAHA, NE 68102-4901

See Item 6

W9128F-17-R-0011

08/29/2017

07/28/2017

08/29/2017

Am #0004 - 2 (Continuation SF 30)

DEPARTMENT OF THE ARMY

Omaha District, Corps of Engineers 1616 Capitol Avenue Omaha, Nebraska 68102-4901 :NOTICE: Failure to acknowledge : Solicitation No. W9128F 17 R 0011 :all amendments may cause rejec- :

:tion of the offer. See FAR : Date of Issue: 28 July 2017 :52.215-1 of Section 00 21 00 : Date of Receiving Proposals:

07 September 2017

Amendment No. 0004 29 August 2017

SUBJECT: Amendment No. 0004 to Request for Proposal Solicitation Package for Construction of Rehab Powerhouse Bridge Cranes, Oahe Dam, SD.

Solicitation No. W9128F 17 R 0011.

TO: Prospective Offerors 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 or sections as noted below. The substituted pages or sections are revised and reissued with this amendment.

Pages or Sections Deleted Pages or Sections Substituted or Added

SECTION 41 01 20.72 26 SECTION 41 01 20.72 26

BRIDGE CRANE MECHANICAL AND BRIDGE CRANE MECHANICAL AND

STRUCTURAL REHABILITATION STRUCTURAL REHABILITATION

b. Drawings (Reissued). The following drawings are revised with latest revision date of 28 August 2017, and reissued with this amendment.

(1) Sheet E-101 and M-101

2. This amendment is a part of the proposing papers and its receipt shall be acknowledged on the Standard Form 1442. All other conditions and requirements of the request for proposal remain unchanged. If the proposals have been mailed prior to receiving this amendment, you will notify the office where proposals are received, in the specified manner, immediately of its receipt and of any changes in your proposal occasioned thereby.

a. Hand-Carried Proposals shall be delivered to the U.S. Army Corps of Engineers, Omaha District, Contracting Division, 1616 Capitol Avenue, Omaha, Nebraska 68102-4901.

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

3. Offers will be received until 2:00 p.m., local time at place of receiving proposals, 07 September 2017.

Am #0004 - 3 (Continuation SF 30)

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

29 August 2017

MFS/2184

Rehab Powerhouse Bridge Cranes, Oahe Dam, SD OA72

SECTION TABLE OF CONTENTS

DIVISION 41 - MATERIAL PROCESSING AND HANDLING EQUIPMENT

SECTION 41 01 20.72 26

BRIDGE CRANE MECHANICAL AND STRUCTURAL REHABILITATION

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

1.2 REFERENCES

1.3 SUBMITTALS

1.4 DESIGN CRITERIA

1.4.1 General

1.4.2 Dead Loads

1.4.3 Live Loads

1.4.4 Impact

1.4.5 Horizontal Forces

1.4.6 Collision Forces

1.4.7 Unit Stresses

1.4.7.1 Beams, Girders, Columns, and Other Members Carrying Primary

Loads

1.4.7.2 Bolts

1.4.7.3 Welds

1.4.7.4 Detailing Requirements

1.4.7.5 Mechanical Parts of the Crane

1.4.7.6 Stress Concentration Factors

1.4.7.7 Wire Rope Stresses

1.4.7.8 Drum Stresses (Optional bid item requirement)

1.4.8 Use of Cast Iron

1.4.9 Connections

1.4.9.1 Shop Connections

1.4.9.2 Welded Connections

1.4.9.3 Bolted Connections

1.5 SUBMISSION OF CRANE DESIGN DATA

1.5.1 General

1.5.2 Drawing Index

1.5.3 Bill of Materials/Schedule of Equipment

1.5.4 Drawings

1.5.4.1 Dimensioned Assembly Drawings

1.5.4.2 Detailed Shop Drawings

1.5.5 Product Data

1.5.5.1 General

1.5.5.2 Type of Equipment and Quality

1.5.6 Design Calculations

1.5.6.1 Finite Element Analysis (FEA)

1.6 FINAL APPROVED VERSIONS OF CONTRACTOR PREPARED DRAWINGS AND FINAL

CALCULATIONS

1.6.1 Final Approved Versions of Contractor Prepared Drawings

1.6.2 Final Calculations

1.7 FIELD MEASUREMENTS

1.8 MAINTENANCE

1.8.1 Accessories and Special Tools

1.8.2 Spare Parts

1.9 WARRANTY

PART 2 PRODUCTS

SECTION 41 01 20.72 26 Page 1 Am0004

2.1 NAMEPLATES AND CAPACITY PLATES

2.1.1 General

2.1.2 Contractor's Nameplate and Capacity Plates

2.1.3 Plate Details

2.1.4 Warning Labels

2.2 OPERATOR CAB

2.2.1 General

2.2.2 Design Loads

2.2.3 Operator Cab Connections

2.2.3.1 Cab Construction

2.2.3.2 Cab Windows

2.2.3.3 Cab Access Door

2.2.4 Foot Rest

2.2.5 Floor Hatch (For Emergency Egress)

2.2.6 Personnel Lowering Device

2.2.7 Operator Control Station

2.3 PLATFORMS, WALKWAYS, GUARDRAILS, ACCESS LADDERS, AND SAFETY GATES

2.3.1 General

2.3.2 Platforms, Walkways, Guardrails

2.3.3 Ladders

2.3.4 Safety Gates

2.4 FALL ARREST ANCHOR POINTS

2.5 ELECTRIC MOTORS

2.6 TROLLEY DRIVE

2.7 BRIDGE DRIVE

2.8 MACHINERY EFFICIENCIES

2.9 GEARS AND SPEED REDUCERS

2.9.1 General

2.9.2 Gear Rating

2.9.3 Gear Manufacture and Assembly

2.9.4 Speed Reducers

2.9.4.1 Speed Reducer Rating

2.9.4.2 Speed Reducer Features

2.9.4.3 Speed Reducer Lubrication

2.9.4.4 Speed Reducer Nameplate

2.9.4.5 Speed Reducer Mounting

2.9.5 Additional Requirements for Speed Reducers

2.10 GEAR CASES AND GUARDS

2.10.1 General

2.10.2 Gear Reducer Seals

2.10.3 Gear Guards

2.11 BEARINGS

2.11.1 General

2.11.2 Sleeve-Type

2.11.3 Anti-Friction Bearings

2.12 SHAFTING

2.12.1 General

2.12.2 Shafting Support

2.13 KEYS AND KEYSEATS

2.14 SHAFT COUPLINGS

2.14.1 General

2.14.2 Flexible Couplings

2.15 PINS

2.15.1 General

2.16 DRUMS (Optional Bid Item)

2.16.1 General

2.16.2 Drum Measurements

2.17 HOOKS AND SAFETY LATCHES

SECTION 41 01 20.72 26 Page 2

2.17.1 Auxiliary Hook (Optional Bid Item)

2.17.2 Main Hook (Optional Bid Item)

2.18 WIRE ROPE

2.19 BRIDGE/TROLLEY WHEELS (Optional Bid Item)

2.20 AXLES (Optional Bid Item)

2.21 LUBRICATION

2.21.1 General

2.21.2 Gears

2.21.3 Speed Reducers

2.21.3.1 New Lubricating Oil

2.21.3.2 Speed Reducer Oil Testing

2.21.3.3 New Lubricating Oil Cleanliness

2.21.4 Grease

2.22 GUARDS, COVERS AND DRIP PANS

2.23 FIRE EXTINGUISHER

2.24 HOIST BRAKE WHEELS AND COUPLINGS

2.25 SHEAVES (Optional Bid Item)

PART 3 EXECUTION

3.1 CLEANUP AND REMOVAL

3.1.1 Cleanup

3.1.2 Environmental Considerations

3.1.3 Removal

3.2 MAIN HOISTS

3.2.1 General

3.2.2 Main Hoist Reducers

3.2.3 Main Hoist Pinion Bearing Stands (BID OPTION - NEW DRUMS)

3.2.4 Main Hoist Lower Blocks

3.3 AUXILIARY HOISTS

3.3.1 General

3.3.2 Auxiliary Hoist Reducer

3.3.3 Auxiliary Hoist Gear Guards

3.3.4 Auxiliary Hoist Lower Blocks

3.4 INSPECTIONS

3.4.1 Drum Inspections

3.4.2 Sheave Inspections

3.4.3 Trolley Tension Flange Weld Inspection

3.4.4 Main Hoist Load Block Level Checks

3.4.5 Main Hoist Hook Trunnion Inspection

3.4.6 250/450-Ton Lifting Beam Inspection

3.4.7 Lifting Device for Shaft & Runner

3.5 OPEN GEAR ALIGNMENT

3.5.1 General

3.5.2 Alignment Criteria

3.5.2.1 Alignment Criteria - Main Hoist Gears Only

3.5.3 Marking Compound

3.5.4 Alignment at Light Load

3.5.5 Alignment at Rated Load

3.5.6 Gear Realignment

3.6 TROLLEY DRIVES

3.6.1 General

3.6.2 Drive Installation

3.6.3 Trolley Drive Shafts and Gears

3.6.4 Trolley Wheels (BID OPTION)

3.7 BRIDGE DRIVES

3.7.1 General

3.7.2 Bridge Drives Installation

3.7.3 Bridge Drive Shafts and Gears

SECTION 41 01 20.72 26 Page 3

3.7.4 Bridge Wheels (BID OPTION)

3.8 SHAFT ALIGNMENT

3.9 DYNAMIC BALANCING OF MACHINERY

3.10 MOUNTING BASES

3.10.1 General

3.10.2 Hoist Bases

3.10.3 Trolley Drive Bases

3.10.4 Bridge Drive Bases

3.11 MISCELLANEOUS ITEMS

3.12 BOLTS

3.12.1 Mechanical Bolts

3.12.2 Structural Bolts

3.13 OPERATOR CAB

3.13.1 General

3.13.2 Operator Cab Access

3.14 ANCHOR POINTS

3.14.1 Light Hatch Anchor Points

3.14.2 Operator Cab Anchor Points

3.14.3 Bridge Drive Anchor Points

3.15 NAMEPLATES AND CAPACITY PLATES

3.15.1 Crane Nameplates

3.15.2 Block Capacity Plates

3.15.3 Warning Labels

3.16 HOIST BRAKE ALIGNMENT AND RUN-IN

3.17 PLATFORMS, WALKWAYS, GUARDRAILS, ACCESS LADDERS, AND SAFETY GATES

3.18 CONDUCTOR GUARD / BUSS FRAME GUARD

-- End of Section Table of Contents --

SECTION 41 01 20.72 26 Page 4

SECTION 41 01 20.72 26

BRIDGE CRANE MECHANICAL AND STRUCTURAL REHABILITATION

PART 1 GENERAL

In these Specifications, the word 'provide' shall be understood to mean 'furnish and install' (applicable to materials, equipment, products, systems, etc. to be furnished and installed as part of the crane rehabilitation). Requirements applying to "new" equipment, including but not limited to product data submittals, design calculations, and drawings, shall be understood to also apply to modified and replaced-in-kind equipment.

1.1 DESCRIPTION OF WORK

This SECTION covers the mechanical and structural work for the rehabilitation of the two 250-ton powerhouse bridge cranes, modifications to access walkways, and two 250-ton lifting beams, and one 450 ton lifting beam at Oahe powerhouse. This section also covers the optional weld inspection and load testing of the lifting device for the shaft and runner.

The Contractor shall engineer and design all new, replacement, and modified systems and components of the cranes and submit computations and drawings as stated in paragraph SUBMITTALS below. Detailed shop drawings shall be furnished showing all details required to fabricate and install mechanical and structural equipment. The GENERAL, PRODUCTS and EXECUTION described in this SECTION is applicable to both bridge cranes, unless otherwise specified.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent indicated by the reference. The publications are referred to in the text by basic definition only.

AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA)

ABMA 8.2 (1999) Ball and Roller Bearing Mounting Accessories, Inch Design

ABMA 19.1 (1987; R 1999) Tapered Roller Bearings - Radial Metric Design

ABMA 19.2 (1994; R 1999) Tapered Roller Bearings - Radial Inch Design

ABMA 20 (1996) Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types Metric Design

AMERICAN GEAR MANUFACTURERS ASSOCIATION (AGMA)

AGMA 2000 (1988) Gear Classification and Inspection Handbook

AGMA 2001 (2004d) Fundamental Rating Factors and

SECTION 41 01 20.72 26 Page 5

Calculation Methods for Involute Spur and Helical Gear Teeth

AGMA 6013 (2006) Standard for Industrial Enclosed Gear Drives

AGMA 9005 (2002e) Industrial Gear Lubrication

AMERICAN NATIONAL STANDARD INSTITUTE (ANSI)

and AMERICAN SOCIETY OF SAFETY ENGINEERS (ASSE)

ANSI/ASSE A1264.1 (2007) Safety Requirements for Workplace Walking/Working Surfaces and Their Access;

Workplace, Floor, Wall and Roof Openings;

Stairs and Guardrails Systems

ANSI Z359.1 (2007) Safety Requirements Summary for Personal Fall Arrest Systems, Subsystems and Components

AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

AISC 316 (1989) ASD Manual of Steel Construction

ASME INTERNATIONAL (ASME)

ASME B4.1 (1967; R 2009) Preferred Limits and Fits for Cylindrical Parts

ASME B15.1 (2000) Safety Standard for Mechanical Power Transmission Apparatus

ASME B17.1 (1967; R 2003) Keys and Keyseats

ASME B30.10 (2009) Hooks

ASME B30.2 (2011) Overhead and Gantry Cranes (Top Running Bridge, Single or Multiple Girder, Top Running Trolley Hoist

ASTM INTERNATIONAL (ASTM)

ASTM A 36/A 36M (2008) Carbon Structural Steel

ASTM A 322 (2001e1) Standard Specification Steel Bars, Alloy, Standard Grades

ASTM A 504/A 504M (2008) Standard Specification for Wrought Carbon Steel Wheels

ASTM A 572/A 572M (2012) Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel

ASTM A 307 (2010) Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength

ASTM A 325 (2010) Standard Specification for

SECTION 41 01 20.72 26 Page 6

Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

ASTM A 490 (2012) Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength

ASTM B 22 (2002) Bronze Castings for Bridges and Turntables

ASTM D 445 (2006) Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and the Calculation of Dynamic Viscosity)

ASTM D 664 (2007) Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

ASTM D 2509 (2003; R 2008) Standard Test Method for Measurement of Load-Carrying Capacity of Lubricating Grease (Timken Method)

ASTM D 4057 (2006) Standard Practice for Manual Sampling of Petroleum and Petroleum Products

ASTM D 4425 (2009) Standard Test Method for Oil Separation From Lubricating Grease by Centrifuging (Koppers Method)

ASTM D 4950 (2008) Standard Classification and Specification for Automotive Service Greases

ASTM D 5185 Determination of Additive Elements, Wear Metals, and Contaminants in Used Lubricating Oils and Determination of Selected Elements in Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

ASTM D 6304 (2007) Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration

AMERICAN WELDING SOCIETY (AWS)

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

CRANE MANUFACTURERS ASSOCIATION OF AMERICA (CMAA)

CMAA 70 (2010) Top Running and Bridge and Gantry Type Multiple Girder Electric Overhead Traveling Cranes, No. 70

SECTION 41 01 20.72 26 Page 7

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 4406 (1999) Hydraulic Fluid Power - Fluids - Method for Coding the Level of Contamination by Solid Particles - Second Edition

ISO 11171 (1999; Corrigendum 1 2001) Hydraulic Fluid Power - Calibration of Automatic Particle Counters for Liquids - First Edition

OCCUPATIONAL SAFETY & HEALTH ADMINISTRATION (OSHA)

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2008; Errata 1-2010; Changes 1-3 2010;

Changes 4-6 2011; Change 7 2012) Safety and Health Requirements Manual

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

29 CFR 1910.27 Fixed Ladders

U.S. GENERAL SERVICES ADMINISTRATION (GSA)

FS RR-W-410 (Rev G) Wire Rope and Strand

1.3 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. When applicable one submital may be used for both bridge cranes. Refer to section 41 22 13.33 for submittals relating to rail repair. The following shall be submitted in accordance with SECTION 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

The following submittals shall be submitted within the timeframe specified in the respective paragraphs that define the requirements of each submittal. In addition see section 41 22 13.33for additional pre-construction submittals pertaining to crane rail.

Field Measurements

Flange Weld Inspection Report; G, HDC

Main Hoist Load Block Level Check (pre-rehab)

SD-02 Shop Drawings

Shop drawings are to be submitted with Crane Design Data design package submittals under SD-05 Design Data.

SD-03 Product Data

Product data is to be submitted with Crane Design Data design package

SECTION 41 01 20.72 26 Page 8 submittals under SD-05 Design Data (except items listed below shall be submitted separately).

Drum Dimensions; G, HDC

Nameplate; PO

Accessories and Special Tools; G, HDC

Spare Parts; G, HDC SD-05 Design Data

The following submittals shall be submitted within the timeframe specified in the respective paragraphs that define the requirements of each submittal.

Design Package Submittals; G, HDC

Crane Design Data; G, HDC

Gear Alignment Procedure; G, HDC

Drum Groove Measuring Procedure; G, HDC

SD-06 Test Reports

The following submittals shall be submitted within the timeframe specified in the respective paragraphs that define the requirements of each submittal.

Hook and Trunnion NDE Report

Shaft Alignment Report

Dynamic Balancing Report; G, HDC

Oil Test Results (New Oil Delivery)

Bridge Wheel Hardness Test Report

Lifting Beam Inspection Report; G,HDC

Main Hoist Load Block Level Check (post-rehab)

NDT Drum Inspection Report; G, HDC

Upper Load Block Inspection Report lifting device inspection report; G, HDC

SD-07 Certificates

Registered Professional Mechanical Engineer; G, PO

Registered Professional Structural Engineer; G, PO

Wire Rope Certificates

SECTION 41 01 20.72 26 Page 9

SD-11 Closeout Submittals

Final Approved Versions of Contractor Prepared Drawings; G, HDC

Final Calculations; G, HDC

1.4 DESIGN CRITERIA

1.4.1 General

The design loads and speeds shall be based on the rated capacities and speeds specified in SECTION 41 01 20.71 26 BRIDGE CRANE DATA, TESTING AND TRAINING. For the purpose of design of structural and mechanical parts, loads resulting from the maximum torque of the motors shall be taken as 200 percent of the rated full load torque of the motors. Design loads shall be computed with each trolley in such position as will give maximum loading or stress in any part of the crane and with due allowance for eccentricity of application. If there are conflicts between design criteria listed here and listed in referenced documents, the most conservative approaches shall govern.

1.4.2 Dead Loads

The dead loads shall include the weight of the bridge, trolley, bridge drive mechanism, platforms, trucks, wheels, operator/equipment cab, electrical equipment, and miscellaneous attached parts. The dead load of the trolley shall include the weight of all machinery and attached equipment except the weight of the movable blocks (lower sheave blocks) and ropes included with the live load.

1.4.3 Live Loads

a. Hoist Loads. The live load on each hoist shall include the rated capacity plus the weight of movable blocks (lower sheave blocks) and rope. The rated hoist capacity includes the weight of the lifting beams.

b. Travel Loads. The live load on the main hoist for trolley travel operations shall include the weight of the blocks, ropes, and rated main hoist load. The live load on the bridge crane for travel operations shall be the live load on both main hoists for bridge operation.

1.4.4 Impact

Impact shall be taken as 10 percent of the live load.

1.4.5 Horizontal Forces

a. Bridge - The horizontal forces resulting from the acceleration or deceleration of the crane shall be taken as 10 percent of the sum of the dead load, the weight of the trolley, and the travel loads with the trolley in such position as will give maximum loading or stress due to moment or shear in any part of the bridge crane.

b. Trolley - The forces resulting from the acceleration or deceleration of a trolley shall be taken as 10 percent of the sum of the travel load and trolley weight applied at the top of the trolley rails with the trolley in such position as will give maximum loading or stress due to

SECTION 41 01 20.72 26 Page 10 moment or shear in any part of the bridge crane.

1.4.6 Collision Forces

Collision forces between bumpers and stops shall be taken as the forces produced by such collision with the crane or trolley traveling at full speed with the power off. The rate of deceleration shall be based on the calculated spring travel distance of the existing bumpers with the trolley located at the heaviest end of the bridge. Only the dead load shall be considered as contributing to the collision forces.

1.4.7 Unit Stresses

1.4.7.1 Beams, Girders, Columns, and Other Members Carrying Primary Loads

Allowable stress in structural parts (except bolts and welds) for the beams, girders, columns, and other members carrying primary loads are defined as the lesser of 45 percent of the yield or 75 percent of AISC 316 allowable stresses for ASTM A 36/A 36M or ASTM A 572/A 572M grade 50 steel.

Allowable stresses in all structural parts designed to meet fatigue provisions shall be designed to 100% of AISC 316 and AWS D1.1/D1.1M allowable stresses. Allowable stresses in structural parts not carrying primary loads shall be designed to 100% of AISC 316 allowable stresses.

1.4.7.2 Bolts

Allowable stresses in bolts shall be no more than 75 percent of AISC 316 allowable stresses. Allowable stresses in structural bolts not connecting members carrying primary loads shall be designed to 100% of AISC 316 allowable stresses.

1.4.7.3 Welds

Design of welded joints shall be in accordance with the applicable provisions of AWS D1.1/D1.1M, except that allowable stresses in welds shall be no more than 75 percent of AISC 316 allowable stresses. Allowable stresses in welds designed to meet fatigue provisions shall be designed to 100% of AISC 316 and AWS D1.1/D1.1M allowable stresses. Welds on parts subject to cyclic loads that are in stress categories D, E, or F as per AWS D1.1/D1.1M shall be labeled on the drawings. Allowable stresses in welds not connecting members carrying primary loads shall be designed to 100% of AISC 316 allowable stresses.

1.4.7.4 Detailing Requirements

The detailing of structural components and connections shall conform to the requirements of AISC 316.

1.4.7.5 Mechanical Parts of the Crane

Mechanical parts of the crane shall be designed for rated load, with a factor of safety of 5 based on the ultimate strength of the materials, provided that each part or component, including speed reducers but excluding wire rope, shall be proportioned to withstand the stresses produced by the maximum torque of the motors with resultant stresses not exceeding 75 percent of the yield point of the materials involved. See paragraph SHAFTING for design requirements for shafting and axles.

SECTION 41 01 20.72 26 Page 11

1.4.7.6 Stress Concentration Factors

Stress concentration factors shall be used where applicable, including but not being limited to changes in shaft sections and keyways.

1.4.7.7 Wire Rope Stresses

In determining the size of the auxiliary hoist ropes, the maximum stress resulting from the rated load shall be used and shall take into consideration the overall efficiency of the hoist tackle in the blocks and other parts. The stresses shall not be greater than 1/5 the nominal breaking strength of the rope. In addition, the rope tension resulting from the maximum torque of the motor selected shall not exceed 0.7 of the nominal breaking strength of the rope.

1.4.7.8 Drum Stresses (Optional bid item requirement)

The combined bending and crushing stress at rated load for the drums shall not exceed 12,000 pounds per square inch for ASTM A 36/A 36M steel and 16,666 pounds per square inch for ASTM A 572/A 572M - Grade 50 steel. In addition, the stresses in the drums shall not exceed 90 percent of the yield point of the material with loads resulting from the maximum torque of the motor as limited by the VFD controls per SECTION 41 01 20.73 26 BRIDGE CRANE ELECTRICAL REHABILITATION. Drum shafts shall be designed in accordance with paragraph "SHAFTING". Allowable stresses of drum welds, other than drum shell longitudinal and circumferential splice welds, shall be 5,100 pounds per square inch. Drum buckling/crushing calculations shall be done per Roark's equations and minimum bucking safety factor shall be 2.

1.4.8 Use of Cast Iron

Cast iron of a class less than 30 shall not be used for any parts of the crane. Cast iron of class 30 or higher may be used for gear cases. Brake shoes and brake wheels shall conform to materials specified in SECTION

41 01 20.73 26 BRIDGE CRANE ELECTRICAL REHABILITATION.

1.4.9 Connections

1.4.9.1 Shop Connections

Shop connections shall be designed for assembly by means of welding or by bolting. Welding shall not be associated with bolting in the same joint.

Field connections shall be designed for assembly with bolts of the type specified for the application. Riveting will not be acceptable.

1.4.9.2 Welded Connections

Design of welded connections shall be in accordance with the applicable provisions of AWS D1.1/D1.1M, except that allowable unit stresses in paragraph "Unit Stresses" shall apply.

Field welding will not be acceptable, excluding equipment mounting and when shop welding is not practical.

1.4.9.3 Bolted Connections

Design of bolted connections shall be as follows:

a. Machine bolts or fitted bolts shall be used for assembly connections

SECTION 41 01 20.72 26 Page 12 on machine parts, frames, attaching machine parts, and similar items.

b. ASTM A 325 or ASTM A 490 type bolts shall be used on structural bolted connections carrying primary loads.

c. ASTM A 307, ASTM A 325, or machine bolts shall be used for bolted connections on the cab, ladders, guard rails, and similar structural items.

d. All speed reducers, bearing bases, and pillow blocks shall be held securely in place by one of the methods below. NOTE: Detailed calculations shall be submitted per the Design Calculations paragraph to demonstrate that the method chosed to secure bearing bases for final gear reductions are adequate to resist gear separation forces.

(1) Fitted bolts installed with plain washers and double nuts.

(2) Machine bolts and dowels. The dowels shall be of such size as to adequately locate the device and resist the total shearing forces. The bolts shall be installed with nuts and lockwashers.

(3) Shear blocks installed at all four corners of the reducer, bearing base, or pillow block, with welds adequately sized to resist shearing forces. Shear blocks shall be of sufficient width and welds adequately sized that they will not roll over if lateral forces are placed at the top edge of the blocks. Additionally, machine bolts shall be installed with nuts and lock washers.

1.5 SUBMISSION OF CRANE DESIGN DATA

1.5.1 General

Crane Design Data shall be submitted. Crane Design Data shall be approved prior to procurement of associated materials and equipment. Crane Design Data shall be submitted for each major crane component or system of components and shall include the following items which are described in the following sub-paragraphs of same title:

a. Drawing Index

b. Bill of Materials/Schedule of Equipment

c. Drawings

d. Product Data

e. Design Calculations

Crane Design Data for a complete crane rehabilitation shall be submitted in a logical order with the major components submitted first and the lesser components submitted afterwards. Examples of Crane Components or Systems include, but are not limited to:

1. Main Hoist

2. Auxiliary Hoist

3. Bridge Drive

4. Operator Cab and its Connections.

5. Personnel Lowering Device and its attachments

6. Walkways and Platforms

7. Safety Gates

All submittals for Crane Design Data shall be uniquely categorized into Design Package Submittals and shall be named based off the Crane Components

SECTION 41 01 20.72 26 Page 13 or Systems. For example: "Crane Design Data - Main Hoist". A list of proposed Design Package Submittals with schedule of submittal dates shall be submitted no later than 30 calendar days after receipt of notice to proceed.

All mechanical computations and drawings submitted as part of the Crane Design Data shall be stamped and signed by a registered professional mechanical engineer who has done the design himself/herself or supervised and reviewed work if done by other engineers.

All structural computations and drawings submitted as part of the Crane Design Data shall be stamped and signed by a registered professional structural engineer as a structural engineer or has passed the NCEES 16-hour Structural exam, and who has done the design himself/herself or supervised and reviewed work if done by other engineers.

Crane design data crane components or systems numbered 1 through 4, as listed above, shall be submitted no later than 90 calendar days prior to the date the 'crane taken out of service date'. Crane design data for any remaining crane components or systems shall be submitted no later than 60 calendar days prior to the 'crane taken out of service date'

1.5.2 Drawing Index

Contractor shall submit an index for each drawing set submitted. The index shall be part of the accompanying drawing set, having a title block, border, and sheet number compatible with the drawing set.

1.5.3 Bill of Materials/Schedule of Equipment

Bill of materials or parts lists shall be included on the drawings, consisting of total quantity, manufacturer, part number, material type, size, and weight of item or equipment; or bill of materials shall be drawings that are part of the drawing set, having a title block, border, and sheet number compatible with the drawing set. Bill of materials shall provide a cross reference between manufacturer data and shop drawings.

1.5.4 Drawings

Submit design drawings for a complete crane rehabilitation for each major system and/or component for each bridge crane as a whole. Drawings shall be easily readable in half size format. Weights of items shall be included on the drawings. Show assembly views and all details required for a complete crane rehabilitation, including but not being limited to layout and installation of all hoist, trolley, and bridge drive machinery.

Drawings shall include detailed locations of all drilling required in structural members. Drawings of replaced components shall be provided.

Reference drawings used in the development of the Contractor prepared drawings shall be noted on the drawing by listing the FIO sheet number, file number, the manufacturer's drawing number, and reference drawing title. The use of reference drawings in lieu of providing new drawings will not be acceptable. Drawings shall be submitted in accordance with

SECTION 01 33 00 SUBMITTAL PROCEDURES.

1.5.4.1 Dimensioned Assembly Drawings

a. Submit dimensioned assembly drawings for the overall bridge crane rehabilitation including hoist machinery, trolley and bridge drive machinery, and other components as specified. Show plan and elevation

SECTION 41 01 20.72 26 Page 14 views of the overall crane and component systems, indicating locations and layout of all mechanical equipment, with dimensions, and working clearances. Dimensioned assembly drawings shall show installation of new/replaced/modified equipment and how it is connected to existing equipment.

b. Provide new general assembly and layout drawings. The new general assembly drawings shall reflect the details of the crane rehabilitation and include, at minimum, all dimensions, tabulated data and wire rope spec/lengths that are shown on the reference drawings. Provide a clearance/coverage diagram for the existing main and auxiliary hoist cable drum systems traveling the full extent of the crane rails as field-verified by the Contractor.

1.5.4.2 Detailed Shop Drawings

Detailed shop drawings shall be submitted for approval prior to fabrication of all components. Drawings for individual components shall reference an assembly drawing of the entire crane which shows clearances where pertinent and the arrangement of the complete crane assembly. When detailed drawings are submitted, they shall be submitted with arrangement drawings and bill of materials/parts lists. Detail drawings for metalwork and machine work shall include catalog cuts, templates, fabrication and assembly details and type, grade and class of material as appropriate.

1.5.5 Product Data

1.5.5.1 General

Submit complete descriptive literature and specifications of each product or system of products provided for a complete crane rehabilitation, (including but not being limited to the items listed in the submittal article). Product data literature shall include legible manufacturer's cut sheets and data sheets to clearly indicate physical construction, operation, mechanical and structural characteristics and associated hardware, as applicable. For sheets with extraneous data, clearly indicate which data applies by crossing out non-applicable models, circling the correct options, etc. Include manufacturer's catalog numbers and designations, and clearly cross-reference with shop drawings as appropriate. Product data submitted for approval shall clearly show conformance with these specifications, including, but not being limited to product manufacturers' declarations of conformance to applicable technical standards. Product data will be used for supporting approval of components shown or listed on the drawings. Approval of items for which product data is submitted will be by approving drawings that list these items on the drawing material lists.

1.5.5.2 Type of Equipment and Quality

Materials and equipment shall be of the type normally furnished for crane applications and service and shall be the standard, unmodified, products of manufacturers specializing in the production of this type of equipment as evidenced by the existence of previously published catalog data. Equipment and materials for the same, similar, or allied services shall be of the same manufacturer and type, and when of the same rating, shall be interchangeable. Materials and equipment shall be new and unused.

Defective equipment or equipment damaged in the course of installation shall be replaced or repaired as approved by the Contracting Officer.

SECTION 41 01 20.72 26 Page 15

1.5.6 Design Calculations

Design calculations for new, replaced, and modified mechanical and structural components shall be submitted for approval. Design calculations for new/modified/replaced components (or system of components) shall be submitted concurrent with the drawings and product data specific to the designed component (or system of components). Calculations shall include a list of assumptions made, a list of all codes and standards referenced, equations, specified efficiencies, limits, factors of safety, component ratings, sources of values used, free body diagrams, or sketches of each load case. Calculations shall show that the rehabilitated crane meets the capacities and speeds as listed in SECTION 41 01 20.71 26 BRIDGE CRANE

DATA, TESTING AND TRAINING.

1.5.6.1 Finite Element Analysis (FEA)

When FEA data is submitted it shall be accompanied by sample written calculations that support the FEA analysis. Post-processing FEA data, such as graphics output, submitted alone will not be accepted. Submit an electronic copy of the model to the Government.

1.6 FINAL APPROVED VERSIONS OF CONTRACTOR PREPARED DRAWINGS AND FINAL

CALCULATIONS

1.6.1 Final Approved Versions of Contractor Prepared Drawings

Final Approved Versions of Contractor Prepared Drawings shall be submitted. Final approved versions of Contractor prepared drawings shall be submitted in accordance with SECTION 01 78 00.00 28 CLOSEOUT SUBMITTALS. Contractor prepared drawings shall be updated if there are any outstanding comments. Modifications to approved Contractor prepared drawings made during fabrication and installation shall be immediately recorded for inclusion into final versions of Contractor prepared drawings. A set of 11 by 17 inch final approved versions of Contractor prepared drawings shall be inserted in the Operation and Maintenance Manuals, see SECTION 01 78 23.00 28 OPERATION AND MAINTENANCE DATA for requirements on the O&M manuals.

1.6.2 Final Calculations

Separate Final Calculations shall be submitted. Final Calculations shall be submitted and approved prior to start of acceptance testing. All design calculations shall be assembled with a table of contents and submitted for review to verify that all calculations have been assembled and to verify that they have incorporated all outstanding comments and changes to the design. When final calculations are submitted, each section shall include reference to submittals where that section was approved. They shall be called "Final Calculations." Upon approval of the final calculations, they shall be inserted as a separate section in the Operation and Maintenance Manuals, see SECTION 01 78 23.00 28 OPERATION AND MAINTENANCE DATA for requirements on the O&M manuals. One electronic copy (CD) and one hard copy of the final calculations shall be submitted to Hydroelectric Design Center.

1.7 FIELD MEASUREMENTS

Before performing any work, Contractor shall become familiar with all details of the work, verify all dimensions in the field, and submit a letter describing the results of this verification including discrepancies

SECTION 41 01 20.72 26 Page 16 to the Contracting Officer. Field Measurements shall be submitted.

1.8 MAINTENANCE

1.8.1 Accessories and Special Tools

Furnish a complete set of accessories and special tools unique to equipment provided and required for erecting, handling, dismantling, testing and maintaining the apparatus pertinent to the powerhouse bridge crane.

1.8.2 Spare Parts

a. For each powerhouse bridge crane, furnish spare parts in accordance with manufacturer's recommendation for all systems supplied. As a minimum, supply spare parts as specified below. All spare parts shall be of the same material and workmanship, shall meet the same requirements, and shall be interchangeable with the corresponding original parts furnished for systems as outlined in SECTION

41 01 20.72 26 BRIDGE CRANE MECHANICAL AND STRUCTURAL REHABILITATION.

Spare parts shall be carefully packed for long-term storage and protection and shall be legibly labeled, identifying service and manufacturer's part number. Spare parts shall be furnished to the Government prior to acceptance testing. Submit list of spare parts for approval. A list of the furnished spare parts shall be included in the Operation and Maintenance Manuals in accordance with SECTION

01 78 23.00 28 OPERATION AND MAINTENANCE DATA.

b. Provide spare parts listed below:

(1) One (1) complete set of mechanical seals and shim pack of each type and size used for the new hoist machinery, including speed reducer and drum bearings.

(2) Four (4) sets of all gearbox and pillow block oil seals, for hoists and drives.

(3) Four (4) replacements of each oil filter or air filter.

(4) Two (2) couplings for each type used.

1.9 WARRANTY

The complete mechanical systems shall be warranted by the respective manufacturers for a period of one year, or the contracted period of any extended warranty agreed upon by the Contractor and the Government, after successful completion of the acceptance test. Any component failing to perform its function as specified and documented shall be repaired or replaced by the Contractor at no additional cost to the Government. Items repaired or replaced shall be warranted for an additional period of at least one year from the date that the system becomes functional again. The warranty period shall start after official turnover of the crane to the Government for beneficial use. This turnover shall not occur until after successful acceptance testing, approved O&M manuals, approved as-builts, etc.

SECTION 41 01 20.72 26 Page 17

PART 2 PRODUCTS

2.1 NAMEPLATES AND CAPACITY PLATES

2.1.1 General

Provide identification plates, warning labels, and capacity rating markings in accordance with the requirements of ASME B30.2.

2.1.2 Contractor's Nameplate and Capacity Plates

Nameplates showing the Contractor's name, date of rehabilitation and that the crane has been rehabilitated shall be provided and installed. Capacity plates showing the rated capacity of each hook shall be attached to both sides of each lower block.

2.1.3 Plate Details

All characters on the nameplates shall be legible when viewed from the turbine floor (at minimum the letter height shall match existing letters of nameplates). Letter color shall be black. Vinyl logos and lettering shall not be used for plates. The new plates shall be attached to the structure with corrosion-resisting steel fasteners. Drawings showing the proposed nameplates, its size, character sizes, and location on the crane shall be submitted for approval. Nameplate shall be submitted.

2.1.4 Warning Labels

Warning labels shall be affixed to appropriate locations on the crane per requirements of ASME B30.2.

2.2 OPERATOR CAB

2.2.1 General

Provide a new open operator cab for the crane, designed and constructed in accordance with CMAA 70, EM 385-1-1, ASME B30.2, and as shown. Submit complete design, including applicable component cut sheets, calculations, and shop drawings for approval. Submit calculations, dimensioned detailed drawings, connection details to current bridge girders and cab lines of sight for Government approval prior to fabrication.

2.2.2 Design Loads

Design the cab for a floor load of 150 psf, and a minimum concentrated load of 300 lbs in addition to the weight of any equipment attached to the cab.

2.2.3 Operator Cab Connections

Design new connections to the crane girder. If a portion of the platform is used to partially support the cab, evaluate and provide calculations for any portion of the existing platform used to support the new cab inclusive connections of platform to the main girder. Show that the added load will be transferred safely to the girder.

SECTION 41 01 20.72 26 Page 18

2.2.3.1 Cab Construction

The frame shall be constructed of structural steel shapes. The exterior unglazed portion of cab shall be covered with steel sheets not less than 1/8-inch thick. The floor shall be made of reinforced steel plate not less than 1/4-inch thick. Provide 7-foot minimum floor to ceiling clear headroom inside cab (i.e. 7-foot minimum headroom shall be provided from top of cab floor surface to bottom of cab lighting fixtures - cab lighting fixtures may be recessed to achieve this). The interior sides of walls and ceiling shall be painted and covered with sound-proof foam. Sound-proof foam shall be black, 1-inch thick, closed cell, moisture-resistant, fire-retardant, dust free, and mold-resistant. Smooth, masticated rubber sheeting with a minimum thickness of 1/4-inch and containing no seams shall be provided for the floor. The cab shall be provided with a ceiling and a hatch covering the cab access hole to keep conditioned air from escaping the cab. A chute shall be provided between the cab access hatch and the cab ceiling (connecting the cab ceiling to the cab access hole on the lower bridge walkway deck). The hatch shall be hinged and shall be made of aluminum floor plate with recessed handle for ease in opening and closing.

Latching mechanism shall be provided for locking hatch in the open position. Paint the cab to match the bridge structure, See SECTION 09 90 00.01 28 PAINTS AND COATINGS for requirements.

2.2.3.2 Cab Windows

General: All windows must be polished glass of the laminated safety type to avoid shards of glass falling down on personnel.

Submit window catalog data and window detail and installation drawings. All windows shall have emissivity coating. Window framing must either be clear-anodized aluminum or aluminum coated with black paint.

Window framing shall not have grooves or channels for screens. Screens shall not be provided. Windows shall be mounted inside cab window openings and be flush with the exterior and interior cab wall surfaces.

Window catalog data and window detail and installation drawings shall be submitted.

Lower Fixed Windows: Lower windows must be fixed windows and be double-glazed with 1/4-inch thick glass. Design retention of lower glazing to positively prevent windows from falling out onto the Powerhouse floor.

Floor Windows: Windows located in floors must be 1-inch minimum thickness and capable of supporting 500 pounds.

Front and sides of cab shall have fixed windows of one (1) piece from the floor to cab ceiling, as shown, except the south side window shall be split with the lower portion being fixed and the upper portion with horizontal sliding window.

2.2.3.3 Cab Access Door

Provide a new cab access door. The new door must be the self-closing adjustable type, half-height (42-inch), automatic latching, designed for easy passage. The door must include a stainless steel spring for automatic door closure. The door must be painted with manufacturer's safety yellow powder coating. The door must be force tested up to 200 pounds and designed in accordance with ANSI/ASSE A1264.1. Submit the cab access door product data and drawings for approval

SECTION 41 01 20.72 26 Page 19

2.2.4 Foot Rest

Provide a foot rest in front of the crane operator chair. The foot rest shall be removable and adjustable. Foot rest shall be bar type or similar to limit interference with crane operator's view, and shall be mounted to the cab frame (not swivel with the chair) to allow operator to rotate chair without pushing off on the glass.

2.2.5 Floor Hatch (For Emergency Egress)

Each cab shall have a floor hatch for lowering disabled personnel through the floor and a fall arrest anchor point located overhead and centered over the floor hatch for the personnel lowering device. The anchor points and supporting members shall be designed for 5000-pound force and installed for anchoring personnel fall arrest harnesses in accordance with EM 385-1-1 section 21.H "Personal Fall Protection System." The floor hatch cover and its supporting members shall be designed for the loading similar to walkway loadings in this specification. Latching mechanism shall be provided for locking hatch in the open position.

2.2.6 Personnel Lowering Device

Provide a personnel lowering device for each operator cab. The personnel lowering device shall be a compact industrial descent device for emergency egress. It shall lower the user at a controlled rate of descent and self adjust for each person's weight, operate by gravity, and use no electricity or power. There shall be no adjustments or special skills needed to operate the device. The unit shall contain an installation carabineer, two

(2) escape belts, and a cable storage reel. The cable lengths shall be long enough to safely lower a person to El. 1273. The device shall be capable of handling a person weighing at minimum 300-lbs and shall be Sellstrom/RTC 1003-DEVXXX Escape-Rite, or approved equal. Provide an enclosure for storing the personnel lowering device, escape belts and associated equipment. The overall dimensions of the personnel lowering device with associated equipment shall not be greater than 27" H x 10.5" W x 8" D. O&M Manual and Customer Training shall be provided for the personnel lowering device; see SECTION 41 01 20.71 26 BRIDGE CRANE DATA, TESTING AND TRAINING for personnel lowering device training requirements.

2.2.7 Operator Control Station

See SECTION 41 01 20.73 26 BRIDGE CRANE ELECTRICAL REHABILITATION for operator control station (chair) requirements.

2.3 PLATFORMS, WALKWAYS, GUARDRAILS, ACCESS LADDERS, AND SAFETY GATES

2.3.1 General

Live loads applied to the design of the items not affected by primary loads shall not be superimposed with primary load cases. Design of structural parts for the walkways, ladders, platforms, and similar parts not affected by primary loads shall be in accordance with AISC 316.

2.3.2 Platforms, Walkways, Guardrails

Any new/modified permanent steel platform, walkway, or guardrails

SECTION 41 01 20.72 26 Page 20 provided/modified as part of this contract shall comply with the provisions in EM 385-1-1. All platforms and walkways shall be designed for 50 psf live load plus a concentrated load of 500-lbs placed to maximize its effect in addition to the weight of all items permanently attached to the platform or walkway. Walkways and platforms shall provide a clear passageway of not less than 24 inches where practical. See contract drawings for new and or modified platforms, walkways and associated guardrails. See FIO drawings for reference dimensions of existing structures.

2.3.3 Ladders

New ladders provided as part of the crane rehabilitation shall be structural steel construction designed in…