Design,  M,  Reciprocating Compressor

Maximum Allowable Rod Load (MARL) (Reciprocating Compressor Rating)

A term used in 1st edition of API 618 without definition but interpreted by some manufacturers as relating to the gas only load, not including valve losses and not to be exceeded at any upset including final discharge relief valve pressure. Operation at rod loads exceeding the MARL typically voids the manufacturer’s warranty.

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