Cryostar Sas

Stephane Sgambati

Pierre Papirer

Frank Haensel

A reciprocating cryogenic pumpcomprises a piston reciprocable within a pumping chamber. The pumping chamberhas an inlet suction valvefor cryogenic liquid to be pumped and an outletfor high pressure cryogenic liquid. The inlet valvefor the cryogenic liquid communicates with a cryogenic liquid reception chamberin the cold end or headof the pump. The pump headis at least partially surrounded by a first jacketretaining primary vacuum insulation. The first jacketis itself at least partly surrounded by a second jacket. The jacketdefines a chamber for the reception of a coolant fluid such as liquid nitrogen and the second jacket has an inletand an outletfor the liquid nitrogen. The thermal insulation can be further enhanced by a trapped gas spacebetween the first jacketand an inner sleeve, the latter defining with an outer sleevevacuum insulation for the pumping chamber

Cryogenic pumps

A cryogenic liquid expansion turbine has a turbine wheel mounted on a rotary shaft, at least one radial inlet for cryogenic liquid to be expanded in the expansion turbine for the rotary shaft, and a dry gas sealing means at a position along the rotary shaft between the turbine wheel and the bearings. There is a thermal barrier member between the turbine wheel and the dry gas sealing means, a gas chamber on the dry gas sealing means side of the thermal barrier member, and an internal passage for cryogenic gas to the said gas chamber. A method is also provided.

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Balderscheim, France

Stephane Sgambati