API 618 Process Gas Compressors - LMF - #9

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Untitled table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Arial", sans-serif; } .font1 { font:9.00pt "Arial", sans-serif; } .font2 { font:11.00pt "Arial", sans-serif; } Cylinder Systems As with compressor frames, LMF has extensive and long-time expérience with the sélection of the best-suited cylinder System for each application. Depending on numerous parameters the optimum combination of a large variety of designs and materials is selected. The following incomplète list may give a first impression of the choices available: ► For each application the best-suited cylinder material, from spheroidal cast iron to niresist Compression compartments, valve chambers and piston rod packing areas designed for optimum liquid coolant circulation Large valve chamber volumes minimize pulsations Field-replaceable cylinder liners needing no spécial tools, différent materials and coatings are available Cylinder valves with friction-free guided valve plates or aero-dynamically profiled valve rings Pistons in welded design, cast iron or steel, solid forged steel Piston rods from high-chromium steel, flame-hardened and super-finished, or with metal-oxideceramic surface Suction valve unloading Systems (closed/open or stepless) for capacity control and start-up/shut-down of the compressor ► ► Piston and rod sealing éléments selected to match optimally the operating parameters: - Materials from PTFE with various fillers, via PEEK compounds and polyamid to cast iron, alloyed steel and bronze, for dry-running to fully lubricated opération - Contact rings with or without expander springs, with open or gastight joints - Flexible labyrinth sealing System with "trapped" piston rings, with T-shaped or trapezoidal sections and expander springs with spécial geometry foroptimized running-in and labyrinth action ► Low loaded, exactly dimensioned guide éléments, either as tight-fit or pressure-relieved guide rings ► Rod packings either indirectly cooled, or with internai coolant passages for direct liquid cooling ► Packing éléments as throttle rings, seal rings or labyrinth éléments, without or with support rings in single pièce or segmentai design ► Packings could be designed for lubricated and non-lubricated services, additional vent and buffergas types are available