Abstract

The present invention relates to technology for preventing dry running of a submerged-type pump used for transferring liquefied gas such as liquefied ammonia, liquid hydrogen, liquid nitrogen, liquefied natural gas, liquefied ethylene gas, and liquefied petroleum gas. A flow path switching device (5) comprises a flow path structure (45) that has a first flow path (41), a second flow path (42), and a third flow path (43), and a valve (47) that is disposed in the flow path structure (45) and that selectively connects the third flow path (43) to the first flow path (41) or the second flow path (42), wherein the first flow path (41) is connected to a discharge opening (1b) of the submerged-type pump (1), the second flow path (42) is connected to the inside of an intake container (2), and the third flow path (43) is connected to a discharge port (8) of the intake container (2).

IPC Classes  ?

• F04D 7/02 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
• F04D 13/08 - Units comprising pumps and their driving means the pump being electrically driven for submerged use
• F04D 29/44 - Fluid-guiding means, e.g. diffusers

Abstract

The present invention pertains to a sealing system which is used for a pump for increasing pressure of a volatile liquid such as liquid ammonia. A sealing system (2) is provided with: a stuffing box (35) that forms a barrier chamber (30) and a pump side sealing chamber (43); a mechanical seal (20) that is disposed in the barrier chamber (30); and a barrier gas supply system (32) that supplies, into the barrier chamber (30), a barrier gas having pressure higher that the pressure of the volatile liquid in the pump side sealing chamber (43). The pump side sealing chamber (43) is positioned between an impeller (7) of a pump (1) and the mechanical seal (20). The barrier gas supply system (32) is provided with a pressure control valve (50) that maintains a constant difference between pressure in the barrier chamber (30) and pressure in the pump side sealing chamber (43).

IPC Classes  ?

• F04D 29/12 - Shaft sealings using sealing-rings
• F04D 7/02 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
• F16J 15/18 - Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
• F16J 15/34 - Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
• F16J 15/44 - Free-space packings
• F16J 15/447 - Labyrinth packings

Abstract

A method for processing a radioactive iodine-containing fluid, in which a fluid containing radioactive iodine is passed through an iodine adsorbent comprising a silver-containing binderless zeolite molded body having a silver content of 50 wt.% or less to cause the iodine adsorbent to adsorb the radioactive iodine.

IPC Classes  ?

• G21F 9/12 - Processing by ion-exchange
• B01J 20/18 - Synthetic zeolitic molecular sieves
• B01J 20/28 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
• C01B 39/18 - Type A from a reaction mixture containing at least one aluminium silicate or aluminosilicate of a clay type, e.g. kaolin or metakaolin or its exotherm modification or allophane
• C01B 39/22 - Type X
• G21F 9/02 - Treating gases

Abstract

Provided are: an adsorbent for decontaminating iodine compound- and/or antimony-containing radioactive waste liquid by using the flow of water; and a method and an apparatus for treating radioactive waste liquid by using the adsorbent. The adsorbent is characterized by containing a polymer resin and at least 10 parts by weight of a hydrous hydroxide of a rare earth element with respect to 100 parts by weight of the polymer resin, wherein the hydrous hydroxide of the rare earth element contains 1-30 parts by weight of water with respect to 100 parts by weight of the dry product in the hydrous hydroxide and adsorbs iodine compounds and/or antimony.

IPC Classes  ?

• B01J 20/06 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group
• B01J 20/28 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
• G21F 9/12 - Processing by ion-exchange

Abstract

Abstract of the Disclosure: An apparatus for remote monitoring color distribution of two materials charged in a treating column by moving a color sensor along a viewing window of the column. The color sensor moving along the viewing window projects a light on-to the materials in the treating column and receives the reflected light to convert into a reception signal. A comparator com- pares the reception signal with the reference signal representing a standard color of the materials in the column to produce a digital color difference signal. The digital color difference signal is sampled and distributed to indicator lamps in accordance with position signals from the position sensing means which senses the passage of the color sensor by each of a plurality position. Thus, the indicator lamps provides a remote display of the color distribution of the materials along the viewing window. Further, operation processing means is provided which checks the inversion frequency of samples of the color difference signal and the inversion position or positions thereof and selectively produces one of a plurality of control signals each indicating how far the separation process goes.

IPC Classes  ?

• G01N 21/25 - Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands