US 2014/0154408 A1Published application

Economical heavy concrete weight coating for submarine pipelines

AssigneesKing Fahd University of Petroleum and Minerals, Saudi Arabian Oil Company

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

Dependent claims

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.

6 more elements

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.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/175,850Filed 7 Feb 2014
Priority: 24 May 2010
Published: 5 Jun 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

F16L 1/20
Laying or reclaiming pipes on or under water: accessories therefor, e.g. floats or weights
B05D 1/002
Processes for applying liquids or other fluent materials: the substrate being rotated
B05D 1/02
Processes for applying liquids or other fluent materials: performed by spraying
B29C 39/10
For making articles of definite length, i.e. discrete articles: incorporating preformed parts or layers, e.g. casting around inserts or for…

Family

Application12/786,336Continuation · filed 24 May 2010
Application14/175,850Continuation
US 2011/0283516 A1Published application
US 8,662,111 B2Related patent
US 9,322,491 B2Related patent
US 2014/0154408 A1This patent

From the US filing history. Foreign family members aren’t listed.

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