NIKKISO cryogenic submerged motor pumps
Cryogenic submerged motor pumps
Pumps for transporting cryogenic liquefied gases like LNG and LPG. Available in different models such as those installed in storage tanks, out of which the pump can be pulled, one installed in separate pots, and a fixed type installed in tankers.
- Submerged wetted motor configuration eliminates leakage of liquids and makes pump construction simple
- Long bearing service life by minimal bearing load design
- Pump test facility with LNG (-162 °C) is available
Removable (in-tank) pumps
Removable pumps are used for product send-out or the emergency off-loading of cryogenic liquids from a storage tank. This pump is installed into the storage tank at the lower end of a discharge column. By application of a positive pressure, inert gas purges to the discharge column, the pump may be removed from the operating system for ease of maintenance or transfer to an alternate location.
Suction vessel mounted pumps
Suction vessel mounted pumps are used for product send out, product transfer or the increase in pressure (“boosting”) of cryogenic liquids within a system. This pump is typically installed into a pressure vessel called a suction vessel or “suction pot”. By closing the suction and discharge valves, then applying an inert gas purges to the suction pot, the suction vessel mounted pump may be easily removed for maintenance or transferred to a similar location.
Compact variable speed pumps
Compact variable speed pumps are similar in design to suction vessel mounted pumps. This pump is primarily for use in co-generation facilities where greater flexibility is required during pump operation. By utilizing a variable frequency drive (VFD) to regulate rotating speed, greater variation in discharge pressure for a given pumping capacity can be achieved. In addition to increased performance versatility, the use of a VFD will allow the compact variable speed pump to be started at a reduced frequency (“soft-start”), decreasing the starting current level and lowering the required ampacity of the electrical system.
