19.G Dredging.
19.G.01 Prior to repair or maintenance on the pump, suction or discharge lines below the water line, or within the hull, the ladder (or drag arm) must be raised (above the waterline) and positively secured.
Dredging Baltimore Harbor
This provision is in addition to the normal securing of hoisting machinery. Blank or block plates must also be set in suction or discharge lines as appropriate.
19.G.02 Dredge pipelines that are floating or supported on trestles must display appropriate lights at night and in periods of restricted visibility in accordance with USCG regulations and 33 CFR 88.15.
19.G.03 Submerged and floating dredge pipeline.
- Submerged pipeline and any anchor securing the pipeline must rest on the channel bottom where a pipeline crosses a navigation channel. The depth of the submerged pipeline will be provided to the USCG for publication.
- (1) Whenever buoyant or semi-buoyant pipeline is used, the dredge operator will assure that the pipeline remains fully submerged and on the bottom. Whenever it is necessary to raise the pipeline, proper clearances must be made and maintained and the entire length of the pipeline will be adequately marked.
- (2) Submerged pipelines must be marked in accordance with local USCG requirements and as approved by the GDA.
- (a) Unless otherwise specified by the USCG, submerged pipelines are considered to require special marks and must have a USCG-approved flashing yellow light.
- (b) Indicators, such as signs or buoys that state "DANGER SUBMERGED PIPELINE" will be placed at the beginning and end of the pipeline. In addition, indicators are required
- (c) Beginning in areas which reduce the charted depth by more than 10%, and, as a minimum, every 1000 ft (304.8 m) to clearly warn of the pipeline length and course.
- (d) If barges or other vessels are used to anchor the beginning and/or end of the submerged pipeline, they must be lighted in accordance with 33 CFR 88.13.
- (e) Within a navigation channel, each end of the pipeline must be identified with a regulatory marker buoy.
- (f) Lengths of submerged pipeline located outside of the navigation channel, which reduce the charted depth by more than 10 percent, will be identified with high visibility buoys marked with 360 degree visibility retro-reflective tape, such as orange neoprene buoys, placed at an interval not to exceed 500 ft (152.4 m) to clearly show the pipeline length and course.
- Routine inspections of the submerged pipe must be conducted to ensure anchorage.
- All anchors and related material must be removed when the submerged pipe is removed.
- Floating pipeline is any pipeline that is not anchored on the channel bottom. Pipelines must not be permitted to fluctuate between the water surface and the channel bottom.
- Pipelines must be marked with the owner's name for positive identification in the event of loss (adrift) or damage to vessels operating in the area.
19.G.04 Dredges must be designed so that a failure or rupture of any of the dredge pump components, including dredge pipe, must not cause the dredge to sink. Data or plans supporting this capability must be available to the GDA upon request.
19.G.05 Mobilization, demobilization, and relocation of dredges, support barges, support tenders, tugs, and heavy equipment must be by qualified persons under the direct supervision of a responsible individual.
19.G.06 Hopper dredges must offer a safe means and process to load and unload personnel.
19.G.07 Any dredge that has a dredge pump below the waterline must have a bilge alarm or shutdown interface.
19.G.08 Covers of "stone boxes" must be secured with at least two positive means when the boxes are working under positive pressure.
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19-10. What is required if lengths of submerged pipeline located outside of the navigation channel reduce the charted depth by more than 10 percent?
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