Issue with setting the zero point for the downward displacement of the reciprocating machine’s piston rod

2022-11-17View Original

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Dear experts: I have a question regarding the setting of the zero point for the downward displacement of the piston rod in reciprocating machines. After the major overhaul of Deleslan’s stage 4 compression reciprocator, the instrument technician reset the zero point for the downward displacement of the piston rod in a static condition (with the probe placed below the piston rod). After starting the oil pump, the DCS showed a downward displacement of -0.27 mm; this value increased to -0.48 mm after the machine was brought online. When should the zero point for the downward displacement of the piston rod be adjusted? Is it before turning on the oil pump after maintenance? After turning on the oil pump? Or after it starts up and operates stably? Are there any relevant standards or specifications as a basis? Thank you

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Issue with setting the zero point for the downward displacement of the reciprocating machine’s piston rod

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