A flange (53, 54, 55) for a pump comprising: a first face (65, 85); a second face (65, 85); a passageway for cryogenic fluid flow extending from said first face to said second face; a first pipe (41, 42); and one of: said passageway for said first pipe comprising a first portion of a first diameter and a second portion of a second diameter greater than said first diameter, a first annular groove in one of said first face and said second face and extending around said first and second portions of said passageway, a first annular portion between said first annular groove and said passageway; and a first annular groove in one of said first face and said second face and extending around said passageway, a first annular portion between said first annular groove and said passageway, a second annular groove extending from an opposite face as said first annular groove and around said first annular groove, a second annular portion between said second annular groove and first annular groove; wherein said first pipe (41, 42) is connected with said first annular portion such that when said first annular portion contracts along the axial direction of the passageway and flex due to a thermal gradient between said first pipe (41,42) and said flange along said first annular portion said first pipe (41,42) moves with said first annular portion. a first face (65, 85); a second face (65, 85); a passageway for cryogenic fluid flow extending from said first face to said second face; a first pipe (41, 42); and one of: said passageway for said first pipe comprising a first portion of a first diameter and a second portion of a second diameter greater than said first diameter, a first annular groove in one of said first face and said second face and extending around said first and second portions of said passageway, a first annular portion between said first annular groove and said passageway; and a first annular groove in one of said first face and said second face and extending around said passageway, a first annular portion between said first annular groove and said passageway, a second annular groove extending from an opposite face as said first annular groove and around said first annular groove, a second annular portion between said second annular groove and first annular groove; said passageway for said first pipe comprising a first portion of a first diameter and a second portion of a second diameter greater than said first diameter, a first annular groove in one of said first face and said second face and extending around said first and second portions of said passageway, a first annular portion between said first annular groove and said passageway; and a first annular groove in one of said first face and said second face and extending around said passageway, a first annular portion between said first annular groove and said passageway, a second annular groove extending from an opposite face as said first annular groove and around said first annular groove, a second annular portion between said second annular groove and first annular groove; wherein said first pipe (41, 42) is connected with said first annular portion such that when said first annular portion contracts along the axial direction of the passageway and flex due to a thermal gradient between said first pipe (41,42) and said flange along said first annular portion said first pipe (41,42) moves with said first annular portion.