Carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline

Patent metadata

Field	Value
Publication number	US-11592124-B2
Application number	US-201817257174-A
Country	US
Kind code	B2
Filing date	Nov 1, 2018
Priority date	Jul 2, 2018
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

A carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline belongs to the technical field of marine structure engineering. The composite submarine pipeline is formed by connecting several composite sub-pipelines arranged sequentially along an axial direction of the pipeline, each composite sub-pipeline has an identical structure and includes an outer carbon steel pipe and an inner stainless steel pipe each having a circular cross section and concentrically placed, concrete or cement mortar is filled between the outer carbon steel pipe and the inner stainless steel pipe to form a sandwiched structure with a circular ring-shaped cross section. Between two adjacent composite sub-pipelines, the welding line of the inner stainless steel pipelines is covered by the concrete/cement mortar, and the fatigue performance of the inner stainless steel pipes at the welding line can be improved effectively.

First claim

What is claimed is:

1. A carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline, formed by connecting several composite sub-pipelines arranged sequentially along an axial direction of the pipeline, wherein each composite sub-pipeline has an identical structure and comprises an outer carbon steel pipe and an inner stainless steel pipe, the outer carbon steel pipe and the inner stainless steel pipe each have a circular cross section and are concentrically placed, and concrete or cement mortar is filled between the outer carbon steel pipe and the inner stainless steel pipe to form a sandwiched structure with a circular ring-shaped cross section,
wherein two adjacent composite sub-pipelines are connected in following mode: axial lengths of inner stainless steel pipes of the two composite sub-pipelines at a junction are each beyond the outer carbon steel pipe and the sandwiched structure by a first length, the two inner stainless steel pipes are aligned and welded in a circumferential direction; two connecting structures having a length of twice the first length cover outer sides of the two inner stainless steel pipes at the junction respectively, each connecting structure is integrally formed by an inner concrete or cement mortar semi-circular ring and an outer carbon steel semi-circular ring placed concentrically, and an inner side of the inner concrete or cement mortar semi-circular ring contacts the outer side of the inner stainless steel pipe at the junction; two outer carbon steel semi-circular rings are aligned and welded in an axial direction; and two welded outer carbon steel semi-circular rings and the outer carbon steel pipes of the composite sub-pipelines at two sides are aligned and welded in the circumferential direction.

2. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 1 , wherein a value of the first length is 200-400 mm.

3. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 2 , wherein the concrete employs any one of normal concrete, light-weight aggregate concrete or recycled concrete.

4. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 1 , wherein the concrete employs any one of normal concrete, light-weight aggregate concrete or recycled concrete.

5. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 1 , wherein the concrete employs any one of normal concrete, light-weight aggregate concrete or recycled concrete.

6. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 1 , wherein a diameter of the outer carbon steel pipe is between 6 and 60 inches.

7. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 6 , wherein a ratio of the diameter of the outer carbon steel pipe to a wall thickness thereof is greater than 15 and less than or equal to 45.

8. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 7 , wherein a thickness of the sandwiched structure is greater than or equal to 30 mm.

9. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 1 , wherein a ratio value of a diameter of the outer carbon steel pipe to a wall thickness to thereof is less than a ratio value of a diameter of the inner stainless steel pipe to a wall thickness thereof.

10. The carbon steel-concrete/cement mortar-stainless steel composite submarine pipeline according to claim 1 , wherein a size of the outer carbon steel semi-circular ring is equal to a size of the outer carbon steel pipes at two sides.

Assignees

• Univ Tsinghua

Inventors

• Wang Facheng
• Yu Qing
• Zhao Huayang

Classifications

• F16L9/153 Primary

  comprising only layers of metal and concrete with or without reinforcement · CPC title

• B32B2250/03

  3 layers · CPC title

• B32B2250/40

  Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA · CPC title

• B32B15/18

  comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} · CPC title

• B32B13/06

  of metal · CPC title