Design,  M,  Reciprocating Compressor


The abbreviation for Maximum Allowable Continuous Combined Rod Load. A value determined by the original equipment manufacturer (OEM) based on design limits of the various components in the compressor frame and the running gear (bearings, crankshaft, connecting rod, crosshead assembly, piston rod, or piston assembly). With minor exceptions, no single value of combined rod load should exceed the manufacturer’s ratings for MACCRL. OEMs may have individual limits for the compressive rod load, the tension rod load, and the compressive plus tension rod load. Note that this definition is similar to the MACRL definition except that load is calculated every 10 degrees (5 degrees in 5th edition of API 618) and load at the pin is the component in the direction of the piston motion.

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