888-B405-02r1 Cathodic Protection Calculations (1).pdf
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- Attached to
- CELRE Three Deck Barges Federal contract opportunity
- Solicitation number
- W912BU-24-B-0019
About this file
This document appears to be a set of cathodic protection calculations for a 150' x 38' x 10' deck barge. The calculations reference the ABS rules for cathodic protection of ships and assume a 5'6" draft. The wetted surface area is calculated to be 7,872.4 sq ft. Based on a current density of 2 mA/sq ft and a 5-year protective period, the calculations indicate that 30 anodes totaling 1,278 lbs are required, though 44 anodes totaling 1,936 lbs were actually installed. The document also includes dimensional details and surface area calculations for the barge.
The related federal contract opportunity is for the procurement of three 150' x 38' welded steel barges to support the civil works maintenance and repair mission of the Detroit District of the U.S. Army Corps of Engineers. The solicitation number is W912BU-24-B-0019, and the closing date for requests for information is June 21, 2024. This is an Invitation for Bid with liquidated damages and bonding requirements. The barges are to be delivered to the U.S. Army Engineer Detroit District in Sault Sainte Marie, MI and Duluth, MN.
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Text version
REV ZONE DRAWN CHKD
0 ‐ CTS JSS
1 ‐ WRH JSS
GENERAL NOTES
RESERVATIONS
NO.
SIZE REV
A 1
DATE: SCALE: SHEET 1 OF 4 NTS
APP'D BY: PROJECT NO. DWG. NO.
3383 888‐B405‐02
DATE: TSGI PROJ #:
Cathodic Protection Calculations2/2/2023 0430‐001
MARINE DESIGN CENTER
REFERENCES
THE SHEARER GROUP, INC.
3118 HARRISBURG BLVD, SUITE 100
HOUSTON, TX 77003
TEL: (281) 532‐2080 ~ FAX (281) 326‐1615
www.shearer‐group.com
CELRE DECK BARGES
DRAWN BY: CHECKED BY: 150'‐0" X 38'‐0" X 10'‐0"
CTS JSS
Cathodic Protection Plan 883‐B405‐01 1
DESCRIPTION DWG NO. REV.
1. ABS CATHODIC PROTECTION OF SHIPS, 2017 WAS USED AS BASIS FOR CALCULATIONS
2. CALCULATIONS ASSUME 5'‐6" DRAFT
REVISION HISTORY
DESCRIPTION DATE
1. INITIAL REVIEW 02FEB23
1. REVISED TITLE BLOCK 31MAY23
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PROJECT: 3383 Rev: 1 By: WRH
CALC: Date: 31MAY23 Checked: JSS
Anode Estimate
ABS method (see ref. 1)
Wtotal = Weight of anodes required for hull protection, (lbs)
Nreq'd = Number of anodes required
WInstalled = Actual weight of anodes installed, (lb)
NInstalled = Number of anodes installed
AW = Wetted surface area, (ft i = Current density, (A/ft ts = protective period, (yrs) fb = Utilization factor, (1 for constant use)
Qg = Electrochemical efficiency of anode, (A-h/lb)
Wanode = Weight of selected anode, (lb)
A W = 7872.4 i = 2 mA/ft (from Table 3, 8 kn operation)
= 0.002 A/ft ts = 5 years
= 43800 hours fb = 1 (for constant use)
Qg = 540 A-h/lb (for magnesium, from manuf)
Wanode = 44 lb (from manuf)
Wreq'd = 1278 lb WInstalled = 1936
Nreq'd = 30 NInstalled = 44
888‐B405‐02
Cathodic Protection Design Calculations ‐ Hull Anodes ft (via GHS)
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Barge Dimensions
L (ft) W (ft) D (ft)
150 38 7
142892 992.3055556 Via GHS:
Bottom 733248 5092 SA w 7872.4 ft
Bow Rake 77976 541.5
Stern 38304 266
Total 1135312 in
= 7884.111 ft
0.645855941
78.33846154
888‐B405‐02
Cathodic Protection Design Calculations ‐ Surface Area Calculations
Wetted Surface Area (in
Sides (individual)
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888‐B405‐02
Cathodic Protection Design Calculations ‐ Example Data
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