Importance

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Abstract

A triplex plunger pump for liquid cryogen service includes a power end frame comprising a casing formed of welded plate sections and elongated tubular members interconnected to form a main bearing support structure which minimizes the transmission of pump reaction forces to the casing outer walls. The power end frame is provided with removable guide sleeves for supporting respective cylindrical crossheads. The sleeves are retained in the power end frame in bores formed in spaced apart support plates. The crank or eccentric shaft is a multipart assembly including a cylindrical shaft having spaced apart splined sections which are interfittingly engaged with splines formed on removable eccentrics. The shaft main support bearings and the eccentric bearings are cylindrical roller bearing assemblies. The cryogenic fluid ends are supported in individual adaptor members which are removably mounted on the power end frame and include four spaced apart legs or tension rods to minimize the surface area available for conducting heat from the power end to the fluid end cylinders and for providing improved access to the coupling between the pony rods and the pump plunger rods.

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First Claim