MANUFACTURE OF PIPES

1 . A method of manufacturing a pipe comprising cold-gas dynamic spraying of particles onto a suitable support member thereby producing a pipe, and separating the pipe from the support member.

2 . The method according to claim 1 , wherein the support member comprises a mandrel, the external surface of which defines the internal surface of the pipe.

3 . The method according to claim 1 , wherein the support member comprises a mold, the internal surface of which defines the external surface of the pipe.

4 . The method according to claim 1 , wherein the surface of the support member is relatively smooth and defect-free.

5 . The method according to claim 1 , wherein the composition of the pipe varies along the length and/or across the thickness of the pipe.

6 . The method according to claim 5 , wherein the pipe comprises two or more discrete lengths and/or layers of different materials.

7 . The method according to claim 5 , wherein the composition of the pipe varies gradually along the length and/or across the thickness of the pipe.

8 . The method according to claim 1 , wherein the pipe comprises a material to confer corrosion and/or wear resistance to a surface of the pipe.

9 . The method according to claim 1 , wherein the support member comprises surface features that impart a high surface area to a corresponding surface of the pipe.

10 . The method according to claim 1 , wherein separating of the pipe from the support member comprises heating or cooling the pipe and/or the support member.

11 . The method according to claim 1 , wherein separating of the pipe from the support member comprises dissolving, melting, evaporating or breaking the support member.

12 . The method according to claim 1 , wherein the pipe comprises titanium and/or titanium alloy.

13 - 14 . (canceled)