Klein, Schanzlin & Becker Aktiengesellschaft

Hans-Joachim Franke

Robert Dernedde

Peter Havekost

Jurgen Schill

Christian Klepp

A liquefied gas pump wherein a vessel contains a supply of liquefied gas which is pumped from its inlet to its outlet by a multi-stage upright centrifugal pump whose first stage is immersed in the supply of liquefied gas in the vessel. The shaft seal at the upper end of the pump housing is held out of contact with liquefied gas by a first flow restrictor above the last stage of the pump, an expansion chamber which is filled with liquefied gas and is located above the first flow restrictor, a gas collecting chamber between the expansion chamber and the seal, and a second flow restrictor which is disposed between the two chambers and prevents penetration of liquefied gas from the expansion chamber into the collecting chamber. The latter is connected with the vessel and/or with a gas collecting tank. The expansion chamber is connected with the second and/or third stage of the pump in order to ensure that it is filled with liquefied gas.

Liquefied gas pump

A thermal barrier which is interposed between the casing of a pump and the housing of a motor has a first section which resembles a spool and includes a first flange sealingly connected to the casing, a second flange sealingly connected to the housing and a hollow cylindrical core spacedly surrounding the pump shaft between the two flanges. The first section serves primarily or exclusively to establish a seal between the pump casing and the motor housing, and the thermal barrier has a second section which takes up stresses and further serves as a heat insulating and/or heat dissipating device. The second section is removably installed in the space between the two flanges of the first section and spacedly surrounds the core. The second section may be constituted by hollow cylindrical walls, one or more stacks of washers or rings, one or more annuli of parallel tubes, bars, rods, ribs or a combination of such elements. The original second section can be replaced with another second section exhibiting different heat-insulating properties and/or a different resistance to mechanical stresses when the conditions under which the pump and motor assembly is used change sufficiently to warrant replacement of the second section.

Thermal barrier for submersible pump and motor assemblies

A centrifugal pump has a casing with a cylindrical shell surrounding a volute-type inner section which is formed with a hollow radial extension for admission of fluid into a nipple of the shell. The extension forms part of or constitutes a separable sealing device between a passage of the inner section and a passage of the shell. The inner section is suspended in the shell by one or more pipes which are coaxial with the rotor and/or by one or more projections which extend radially from the inner section and abut against the internal surface of the shell or extend into recesses provided therefor in the internal surface of the shell.

Centrifugal pump

The casing of a centrifugal pump has a shell with a cylindrical periphery having one or more recessed facets with flat or spherical surfaces which are welded to end portions of pipes by circumferentially complete machine-made seams each of which is intersected, in its entirety, by at least one imaginary plane that is normal to the axis of the respective pipe. This renders it possible to use automatic welding equipment and to readily inspect the quality of the connection between the shell and a pipe. The surface of the facet can be formed with a circumferentially complete groove to receive a transducer serving to generate signals denoting the intensity of penetrative radiation which has penetrated through the seam from a source of such radiation in the interior of the respective pipe and in register with the respective seam. The shell is suspended on the arms of a foundation and such arms extend into additional facets which are recessed into the periphery of the shell. The additional facets are bounded by such surfaces or are dimensioned in such a way that the shell can move relative to the foundation and/or vice versa in response to the application of thermally induced or pressure-induced stresses, for example, in response to heating or cooling when the heat expansion coefficient of the material of the shell is different from that of the material of the arms of the foundation.

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Grunstadt, Germany

Hans-Joachim Franke