The invention relates to a pipe assembly ( 102 ) for use in a boiler. The pipe assembly ( 102 ) comprises a pipe ( 104 ) having an outer wall ( 106 ) adapted for heat exchange. The pipe ( 104 ) having heat sensing means ( 116 ) located in a recess section of the outer wall ( 106 ) thereof, wherein an internal bore ( 108 ) of the pipe ( 104 ) has a substantially constant cross section in the region of the heat sensing means ( 116 ).
1. A pipe assembly for use in a boiler, the pipe assembly comprising a pipe having an outer wall adapted for heat exchange, the pipe having heat sensing means located in a recess section of the outer wall thereof, wherein an internal bore of the pipe has a substantially constant cross section in the region of the heat sensing means, wherein the pipe comprises an offset portion, along a longitudinal axis of the pipe in the region of the heat sensing means, defined by a concave area along an external portion of one side of the pipe and a corresponding convex area along an external portion of a diametrically opposite side of the pipe and substantially parallel to the concave area.
2. A pipe assembly according to claim 1 , wherein the pipe comprises a diagnostic portion.
3. A pipe assembly according to claim 2 , wherein the diagnostic portion incorporates the recess in the outer wall of the pipe and the heat sensing means.
4. A pipe assembly according to claim 2 , wherein the diagnostic portion is located at said offset portion.
5. A pipe assembly according to claim 2 , wherein at the diagnostic portion, a longitudinal axis of the internal bore curves away from a generally straight longitudinal axis, before curving back to resume its original straight longitudinal axis.
6. A pipe assembly according to claim 2 , wherein the pipe comprises a pre-diagnostic portion situated at a first side of the diagnostic portion and a post-diagnostic portion situated at a second side of the diagnostic portion.
7. A pipe assembly according to claim 6 , wherein the longitudinal axis of the internal bore at the pre-diagnostic portion and the post-diagnostic portion are substantially co-linear.
8. A pipe assembly according to claim 6 , wherein an S region of the heat sensing means incorporates the pre-diagnostic portion, the diagnostic portion and the post-diagnostic portion.
9. A pipe assembly according to claim 1 , wherein the recess section is filled using a filler material.
10. A pipe assembly according to claim 9 , wherein the recess section is filled such that the outer surface is restored to match an outer profile of the rest of the pipe surrounding the recess section.
11. A pipe assembly according to claim 1 , wherein the internal bore is substantially circular in cross section.
12. A pipe assembly according to claim 1 , wherein the internal bore is adapted to allow a fluid to flow therethrough.
13. A pipe assembly according to claim 1 , wherein the pipe assembly further comprises joining means adapted to allow the pipe assembly to be joined to other pipe assemblies.
14. A pipe assembly according to claim 13 , wherein the joining means comprise at least one joining rib.
15. A pipe assembly according to claim 1 , wherein the heat sensing means comprises at least one thermocouple.
16. A pipe assembly according to claim 1 , which further comprises attachment means adapted to allow the pipe assembly to be attached to a surface.
17. The pipe assembly according to claim 1 , wherein the internal bore of the pipe has a substantially constant cross section, along the longitudinal axis of the pipe, within the offset portion.
18. The pipe assembly according to claim 1 , wherein the offset portion comprises a kinked portion.
19. A method of monitoring heat transfer across a heat exchange surface of a pipe assembly, the method comprising the step of:
monitoring an output from heat sensing means which heat sensing means are located in a recess section of an outer wall of a pipe, the pipe comprising an internal bore extending therethrough, wherein the internal bore has a substantially constant cross section in the region of the heat sensing means, wherein the pipe comprises an offset portion, along a longitudinal axis of the pipe in the region of the heat sensing means, defined by a concave area along an external portion of one side of the pipe and a corresponding convex area along an external portion of a diametrically opposite side of the pipe and substantially parallel to the concave area.
20. A method of manufacturing a pipe assembly comprising the steps of:
i) bending a pipe having an internal bore extending therethrough to create a recess section in an outer wall thereof, while maintaining a substantially constant cross section of the internal bore;
ii) locating heat sensing means in the recess section; and
iii) using a filler material to fill the recess section,
wherein bending the pipe comprises creating an offset portion, along a longitudinal axis of the pipe, in the region of the heat sensing means, the offset portion being defined by a concave area along an external portion of one side of the pipe and a corresponding convex area along an external portion of a diametrically opposite side of the pipe and substantially parallel to the concave area.
21. A diagnostic boiler pipe assembly, the assembly comprising a pipe having an outer wall adapted for heat exchange, the pipe having heat sensing means located in a recess section of the outer wall thereof, wherein an internal bore of the pipe has a substantially constant cross section in the region of the heat sensing means, wherein the pipe comprises an offset portion, along a longitudinal axis of the pipe, in the region of the heat sensing means, the offset portion being defined by a concave area along an external portion of one side of the pipe and a corresponding convex area along an external portion of a diametrically opposite side of the pipe and substantially parallel to the concave area.
22. A boiler comprising a pipe assembly, which pipe assembly comprises a pipe having an outer wall adapted for heat exchange, the pipe having heat sensing means located in a recess section of the outer wall thereof, wherein an internal bore of the pipe has a substantially constant cross section in the region of the heat sensing means, wherein the pipe comprises an offset portion, along a longitudinal axis of the pipe, in the region of the heat sensing means, the offset portion being defined by a concave area along an external portion of one side of the pipe and a corresponding convex area along an external portion of a diametrically opposite side of the pipe and substantially parallel to the concave area.