Heated pipe for liquid flows

A heated pipe assembly comprising:

• a pipe extending from an upstream end to a downstream end;
• the pipe including:
• an annular first wall creating a fuel flowpath;
• an annular second wall radially spaced from the first wall;
• an annular gap formed between the first wall and the second wall;
• a heating fluid inlet that receives a heating fluid, the heating fluid inlet extending through the second wall and into the annular gap;
• a heating fluid outlet that discharges the heating fluid, the heating fluid outlet extending from the annular gap and through the second wall;
• and
• a helical rib extending between the first wall and the second wall and defining a flow passage in the annular gap, wherein the flow passage provides a heating flowpath configured to contain the heating fluid to heat the first wall;
• and
• a screen connected to the first wall of the pipe and extending across the fuel flowpath, wherein the screen is shaped to direct ice in the fuel flowpath to the first wall and trap the ice against the first wall such that heat from the first wall melts the ice.

A method of preventing ice from blocking a fuel flowpath comprising:

• urging ice flowing through the fuel flowpath radially outwardly toward an inner surface of a first wall that defines the fuel flowpath using a screen positioned within the fuel flowpath;
• flowing a fluid in a flow passage defined between the first wall and a second wall;
• increasing a temperature of the inner surface with the flowing of the fluid;
• and
• melting the ice.

A pipe assembly comprising:

• a first wall having an inner surface defining a fuel flowpath;
• a second wall spaced radially outward of the first wall;
• a gap formed between the first wall and the second wall defining a flow passage;
• and
• a screen positioned within the fuel flowpath being shaped and configured to direct ice in the fuel flowpath toward the inner surface such that heat from the first wall melts the ice, wherein the screen is shaped to trap the ice in the fuel flowpath against the first wall.

A pipe assembly comprising:

• a first wall having an inner surface defining a fuel flowpath;
• a second wall spaced radially outward of the first wall;
• a gap formed between the first wall and the second wall defining a flow passage;
• and
• a screen positioned within the fuel flowpath being shaped and configured to direct ice in the fuel flowpath toward the inner surface such that heat from the first wall melts the ice, wherein the screen has a conical portion with a downstream end connected to the first wall and an upstream end extending upstream into the fuel flowpath.

A pipe assembly comprising:

• a first wall having an inner surface defining a fuel flowpath;
• a second wall spaced radially outward of the first wall;
• a gap formed between the first wall and the second wall defining a flow passage;
• and
• a screen positioned within the fuel flowpath being shaped and configured to direct ice in the fuel flowpath toward the inner surface such that heat from the first wall melts the ice, wherein the screen is substantially flat and has a downstream end connected to the first wall and an upstream end connected to the first wall.

A pipe assembly comprising:

• a first wall having an inner surface defining a fuel flowpath;
• a second wall spaced radially outward of the first wall;
• a gap formed between the first wall and the second wall defining a flow passage;
• and
• a screen positioned within the fuel flowpath being shaped and configured to direct ice in the fuel flowpath toward the inner surface such that heat from the first wall melts the ice, wherein the screen has a wave shape with a downstream end connected to the first wall and an upstream end connected to the first wall.