CONCENTRIC PIPES WITH DRAIN MEANS

• US 3,612,577 A
• Filed: 10/29/1969
• Issued: 10/12/1971
• Est. Priority Date: 10/30/1968
• Status: Expired due to Term

• Current Assignee: Colin William Dawson, Joseph Albert Pope
• Original Assignee: Colin William Dawson, Joseph Albert Pope
• Inventors: Pope, Joseph Albert, Dawson, Colin William
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US04/872,062
• Time in Patent Office: 713 Days
• Field of Search: 285/13,14,41,133,138,348,148 138/112,113,114,33
• US Class Current: 285/14
• CPC Class Codes: F16L 19/061 a pressure ring being arranged between the clamping ring and the threaded member or the connecting member
• CPC Class Codes: F16L 39/005 for concentric pipes
• CPC Class Codes: F16L 53/32 using hot fluids
• CPC Class Codes: F16L 53/38 using elongate electric heating elements, e.g. wires or ribbons
• CPC Class Codes: F16L 53/70 Cooling of pipes or pipe systems
• CPC Class Codes: F16L 59/14 Arrangements for the insulation of pipes or pipe systems F16L59/02 - F16L59/12 take precedence
• CPC Class Codes: F16L 9/18 Double-walled pipes; Multi-channel pipes or pipe assemblies

Abstract

The invention provides a concentric circular pipe assembly particularly suited for the conveyance of fuel oil under pressure to engines. The inner pipe is used to convey the fuel oil and the outer pipe is provided as a leak jacket to collect and drain away safely any oil escaping from the inner pipe. Between the inner and outer pipes there is provided an expanded helical member which is close fitting about the inner pipe and close-fitting in the outer pipe so that both pipes derive support from one another over helical line contact and this permits bending of the pipes without significant loss of circularity or concentricity and also permits drainage of fluid from the outer pipe. The pipes are terminated with concentric connectors through one of which fluid in the outer pipe can drain.

Claims

1. A pipe arrangement for conveying fluids comprising a circular cross section inner pipe, a circular cross section outer pipe in spaced concentric relationship with said inner pipe, a helical member of circular cross section between said inner and outer pipes, the coils of the helical member being spaced apart and defining an internal diameter close fitting about said inner pipe and an external diameter close fitting in said outer pipe so as to hold the pipes in said spaced concentric relationship, a first connector on the inner pipe for connection to a source supplying fluid at pressure thereto and a second connector on the outer pipe concentric with said first connector and in fluid communication with the space between said inner and outer pipes, for draining fluid escaping from the inner pipe into the outer pipe, and means defining a drain vent from the space between said inner and outer pipes through at least one of said connectors to the exterior thereof.

2. A pipe arrangement as claimed in claim 1 having a helical electrical heater interlayed with the coils of said helical member.

3. A pipe arrangement as claimed in claim 1 wherein said first and second connectors comprise a unitary piece having opposed bores, one bore being threaded and carrying a seal for sealing engagement with said source which includes a fuel pump discharge union and the other bore being unthreaded and carrying a seal sealing with the outside of said outer pipe and providing a drain sump in fluid communication with said vent for fuel draining from the outer pipe.