The Cryostar Magazine N°2 : pdf file

PRODUCTSMRP – the cutting edgeof technologyCRYOSTAR is developing a newreciprocating cryogenic pump under thebrand name of MRP (Modular ReciprocatingPump). This is a new concept in modular pumpsand will be available with two different strokelengths to cover a large range of flows from4-25l/min, with a maximum discharge pressureof 420barg. The maximum speed will belimited to 400rpm in order to increase the durabilityof parts subject to wear.Modular Aspects:To meet the needs of multi- markets, the MRP isbeing developed using a modular philosophy, withthe following key points:> There are two stroke lengths available using thesame cold end and piston to cover a flow range from4-25l/min;> The crank drive can be oil or grease lubricated;> An oil-seal cartridge that can be dismantled easily;> A tapping to fit a temperature probe in the couplingarea to detect seal leakage;> A tapping to fit a temperature probe in the crankdrive housing to measure the oil temperature; and> Tappings for a nitrogen purge to prevent moistureentering the crank drive.Cold end:The technology is being developed with the followingkey points at the fore:> The cold end has a sophisticated insulated cylinderwith a robust and large vacuum chamber to reducethe required NPSH to almost zero and to reduce thecool down time and liquid losses. The insulation hasalso been designed to avoid any mechanical stresson the welds in order to improve the life-time ofthe cylinder, the reliability and safety of this highpressure component;> The suction valve profile has been designed toreduce the pressure drop of liquid into the cylinder;> The numbers of high-pressure seals (piston rings)have been increased to improve the volumetricefficiency;> The low-pressure seal arrangement is a new designwhich will noticeably increase the seal life time; andThe cold end will be in accordance with the latestsafety regulations (PED-CE97/23, etc...)Crank Drive:Features:> The crank drive is a new design which allows for theuse of either grease or oil lubricated bearings;> However, with oil lubrication, the life-time of thebearings will be increased two-fold.> To maintain a strict alignment, a static DU sleeve isno longer used. This is replaced by special segmentslocated on the cross head in order to reduce the radialclearances and the friction coefficient. The noiseand vibration levels are reduced, even at maximumdischarge pressure;> From the safety point of view, oxygen compatibleoil will be available; and> Simplified maintenance procedures enable fasterdisassembly and reassembly.If you would like more information about the MRPand/or other CRYOSTAR technologies contact yourlocal CRYOSTAR office.10Autumn 2003