Patent ID: 7137651

Claim:
A fluid piping system, comprising a plurality of two or more coupled first and second pipe spools, wherein: said first pipe spool comprises: a downstream end and an upstream end; an inner pipe; an outer pipe defining an insulating area between said inner pipe and said outer pipe, wherein said insulating area is under vacuum when said first spool is coupled or uncoupled; and at least one inert gas line disposed between said inner pipe and said outer pipe and running through said insulating area; said second pipe spool comprises: a downstream end and an upstream end; an inner pipe; an outer pipe defining an insulating area between said inner pipe and said outer pipe, wherein said insulating area is under vacuum when said second pipe spool is coupled or uncoupled; and at least one inert gas line disposed between said inner pipe and said outer pipe and running through said insulating area; said first pipe spool is coupled to said second pipe spool such that an annular space is formed between said first pipe spool and said second pipe spool; said annular space is disposed such that inert gas may be supplied to said annular space through at least one of said first pipe spool inert gas line or said second pipe spool inert gas line; and said first pipe spool further including a valve disposed at said upstream end of said first pipe spool such that communication may be established between said insulating area and said annular space.