Molten metal transfer pipe
A transfer pipe for molten metal includes a pipe wall comprised of graphite or ceramic. The graphite ceramic pipe wall can be surrounded by a pipe wall comprising a low thermally conductive material. Both the graphite or ceramic pipe wall and the low thermally conductive pipe wall can be encased in a rigid wall, for example steel. The transfer pipe can communicate with a molten metal pump to provide a system for moving molten metal.
1 . A molten metal transfer pipe comprising:
an inner pipe wall comprising graphite or ceramic; and
a metal outer pipe wall that receives the inner pipe wall.
2 . The pipe of claim 1 , wherein the inner pipe wall is cemented to the outer pipe wall.
3 . The pipe of claim 1 , wherein the inner pipe wall comprises a graphite laminate.
4 . The pipe of claim 1 , further comprising an intermediate pipe wall interposed between the inner pipe wall and the outer pipe wall.
5 . The pipe of claim 4 , wherein the intermediate pipe wall comprises a low thermally conductive material.
6 . The pipe of claim 4 , wherein the intermediate pipe wall comprises an alumino-silicate material.
7 . The pipe of claim 4 , wherein the intermediate pipe comprises fiber sheet.
8 . The pipe of claim 4 , wherein the intermediate pipe comprises extruded fiber.
9 . A method for manufacturing a molten metal transfer pipe comprising:
forming a graphite or ceramic inner pipe wall; and
inserting the inner pipe wall into a rigid non-ceramic pipe wall.
10 . The method of claim 9 , further comprising affixing the inner pipe wall to the rigid pipe wall.
11 . The method of claim 9 , further comprising wrapping a low thermally conductive material around the inner pipe wall.
12 . The method of claim 11 , further comprising curing the low thermally conductive material.
13 . The method of claim 11 , wherein the step of inserting the inner pipe wall further comprises inserting the graphite pipe wall and the low thermally conductive material into the rigid pipe wall.
14 . The method of claim 9 , further comprising interposing a low thermally conductive material between the inner pipe wall and the rigid pipe wall.
15 . The method of claim 14 , wherein the step of interposing a low thermally conductive material comprises injecting low thermally conductive material into a gap between the inner pipe wall and the rigid pipe wall.
16 . A molten metal transfer pipe comprising:
an inner graphite or ceramic pipe wall;
an intermediate pipe wall comprising a low thermally conductive material; and
a rigid outer pipe wall.
17 . The pipe of claim 16 , wherein the rigid outer pipe wall comprises steel.
18 . The pipe of claim 16 , wherein the low thermally conductive material comprises an alumino-silicate material.
19 . A method for manufacturing a molten metal transfer pipe fitting comprising:
forming a first graphite or ceramic portion;
removing material from the first graphite or ceramic portion to form a first graphite or ceramic wall;
forming a second graphite portion having a complementary shape to the first graphite portion;
removing material from the second graphite portion to form a second graphite wall; and
attaching the first graphite wall to the second graphite wall.
20 . A molten metal system comprising:
a means for moving molten metal;
a transfer pipe in communication with the means for moving molten metal, the transfer pipe including an inner pipe wall comprising graphite or ceramic and a metal outer pipe wall that receives the inner pipe wall.