866-B405-02 _Rev 0_CATHODIC PROTECTION CALCULATION _04-15-2021.pdf
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- New Crane Barge
- Solicitation number
- W912BU22B0018
About this file
This document contains a federal contract opportunity for the procurement of a new crane barge. The U.S. Army Corps of Engineers Marine Design Center is seeking bids for the fabrication and delivery of one crane barge to replace an existing vessel operating out of the Sault Ste Marie Area office for the Detroit District. The new barge must be built and classed to ABS standards for Maltese Cross A-1 Steel Barge and Great Lakes Service. Dimensions include a length of 150 feet, beam of 50 feet, depth of 10 feet, and design waterline of 5 feet. The contractor will be responsible for fabrication and delivery to the St. Mary's Falls Canal in Sault Sainte Marie, Michigan. Liquidated damages and bonding requirements apply to this procurement. Bids are due by August 29th at 10:00am EDT and are to be emailed to the specified Army Corps contact.
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Text version
Proj No.
TAI-1240
Date:
04-08-2021
For Steel and Aluminum boat hulls (or under water structures), the following formula can be used to calculate the total weight (in pounds) of sacrificial anodes required.
1.0
8727.15 Sq. ft.
Wetted Surface Area Calculated from Emperical Formula 6375 Sq. ft.
2.0
Wetted surface area considered for Anode Calculation 8727.15 Sq. ft.
Current Density (From Standards for fully Displacement hulls) 2 mA/sq.ft Anode Material considered Aluminum Energy Content (amp-hours per pound for Aluminum anodes) 1200 A-H/lb Immersion hours per year 8760 hours Number of years of life needed for Anodes 5 years Total number of Immersion hours 43800 hours
TOTAL ANODES WEIGHT (lbs) - Calculated 637.082 lbs
REF: Prep By DG Chk By SP App By -
Immersion Hours
PROJECT TITLE:
CELRE CRANE BARGE HARVEY REPLACEMENT
SUBJECT:
ANODE WEIGHT CALCULATION
Estimated Wetted Surface Area of Boat Hulls:
ANODE WEIGHT CALCULATION FORMULA :
Anode Weight (lbs) = ((wetted surface area) x (current density) x (immersion)) / ((energy content) x (1000mA/Amp))
TECHNICAL INFORMATION
Wetted surface area (Sq. ft.)
1.5-5.0 for painted Steel hull/structure 0.2-3.0 for painted Aluminum hull/structure
Current Density (mA per sq.ft)
0.50 LWL x (Beam + Draft) for light-displacement vessels
ANODE SIZING CALCULATION
Number of hours in water per replacement interval (8766 hours per year)
Actual or Estimated Wetted surface area of metal
368 for Mil-Spec zinc anodes 1200 for Mil-Spec aluminum anodes
Energy Content (amp-hours per pound)
0.75LWL x (Beam + Draft) for medium displacement vessels
1.0 LWL x (Beam + Draft) for full hull displacement vessels
(motor yachts and sail boats)
Wetted Surface Area Estimated from AutoCAD drawing for 5'- 6" Draft
TECHNOLOGY ASSOCIATES INC. TAI 1240
Weight of each Anode (from MIL-SPEC-MIL-A24779) (AHS-20) 16.7 lbs No. of anodes required 38.14862 Nos No. of Anodes can be provided 44 Nos
REF: Prep By DG Chk By SP App By -
Conclusion: 1. Install 44 (Forty Four) Aluminum anodes each having 16.7 lb weight.
TECHNOLOGY ASSOCIATES INC. TAI 1240
File details come from the government source that posted it. Updated .