Economical heavy concrete weight coating for submarine pipelines
AssigneesSaudi Arabian Oil Company, King Fahd University of Petroleum and Minerals
InventorsMohammed Al-Mehthel, Mohammed Maslehuddin, Bakr Hammad, Alaeddin A. Al-Sharif, Mohammed Ibrahim
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Abstract
Economical heavy concrete weight coating is used as a weight coating for submarine pipes. The developed economical heavy concrete weight includes steel slag and iron ore as aggregate. Steel slag can contain iron and thus have a higher density than some other types of slag. By supplementing the steel slag with iron ore as aggregate, the economical heavy concrete weight coating can have a higher density than a coating having just slag. Economical heavy concrete weight coating can have a density greater than 190 pcf.
Claims20
A method for increasing the negative buoyancy of a segment of pipe, the method comprises:
- creating an economical heavy concrete weight coating comprising:
- Portland cement;
- iron ore, where the iron ore is less than one half of the weight of the economical heavy concrete weight coating;
- steel slag, where the steel slag is produced by purifying steel billets in one of an electric arc furnace or a basic oxygen furnace;
- and
- sand;
- where the economical heavy concrete weight coating has a unit weight of at least about 190 pounds per cubic foot (pcf) and a thickness in a range of about 1 to about 5 inches;
- and
- attaching the economical heavy concrete weight coating to an outer surface of the segment of pipe, where the segment of pipe with the economical heavy concrete weight coating has a greater negative buoyancy than without the economical heavy concrete weight coating.
A method for providing negative buoyancy to a length of subsea pipeline, the method comprising:
- creating an economical heavy concrete weight coating comprising:
- Portland cement;
- iron ore, where the iron ore is less than one half of the weight of the economical heavy concrete weight coating;
- steel slag, where the steel slag is produced by purifying steel billets in one of an electric arc furnace or a basic oxygen furnace;
- and
- sand;
- where the economical heavy concrete weight coating has a unit weight of at least about 190 pounds per cubic foot and a thickness in a range of about 1 to about 5 inches;
- attaching the economical heavy concrete weight coating to an outer surface of each of a plurality of segments of pipe;
- connecting each of the plurality of segments of pipe to an adjacent one of the plurality of segments of pipe to create the length of subsea pipeline;
- and
- submerging the length of subsea pipeline in a body of water, where the length of subsea pipeline has a negative buoyancy and is operable to maintain the length of subsea pipeline in a position below a surface of the body of water.
Dependencies are inferred from the claim text.