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Loads and forces affecting the condition of piston rods in recip compressors

Piston rod load – Principle and calculation. Major damages on compressors based rod load. For this reason engineers must understand the loads while selecting/using a reciprocating compressor

Mass forces / Inertia forces Inertia force is the force resulting from the acceleration of the reciprocating mass Force from the motor, through the crankshaft to the connection rod will move the crosshead/piston/piston rod

Gas load
At the beginning of a revolution high pressure is in HE and low pressure in CE In TDC the high pressure on HE is “supporting” the piston to move to TDC until it decrease But CE pressure will increase and works “against” piston when it increase Vise versa it happens after BDC The resulting force is a combination of HE and CE pressure

Combines loads
Fcombined = F gas load + F inertia

Other Literature

Loads and forces affecting the condition of piston rods in recip compressors

Piston rod load – Principle and calculation. Major damages on compressors based rod load. For this reason engineers must understand the loads while selecting/using a reciprocating compressor

Mass forces / Inertia forces Inertia force is the force resulting from the acceleration ...


How to detect valve failures with automated pV diagram analyses

Learn how automated pV diagram analyses detect valve failures. Valves count for more than 80% of all failing components in reciprocating compressors. This tutorial explains how failures can be detected by the shape of the pV plot and which parameters should be monitored.


How can I run a root cause analyses after machine trip?

Emergency Shutdown of Rotating Equipment - What next? Hardware-based protection system are made to protect personnel and equipment but they lack the option to find the root cause of an alarm of shutdown. This tutorial explains how a ringbufffer, or flight recorder, works and how operators can benefit. ...


Monitoring of compressor valves Tutorial

Monitoring of compressor valves is a key task to ensure efficient compressor operation. Machine operators have three options for reliable failure detection: 1) segmented analyses of the cylinder vibration 2) analyses of dynamic pressures or 3) a combination of both analyses. This video explains how the ...


Sensor positions on Reciprocating Compressors

Best practices for sensor mounting to obtain perfect signals for Online Condition Monitoring and Machine Protection of Rotating Equipment. This includes acceleration sensors, velocity sensors for API compressors, displacement and pressure sensors.


Intelligent Machine Monitoring - episode basic time signal analyses

What is the relationship between time domain and frequency domain in terms of basic parameters? We will answer this question in the next 8 minutes and provide some expert advice for vibration analyses.


Intelligent Machine Monitoring - Episode Segmentation

Learn why radial and piston compressors each require special analyses for vibration monitoring.


Temporary monitoring & consulting

You know these situations: initial start-ups of new machines, machines going back online after overhauls or major repairs. These are the critical moments in which you need temporary online monitoring and diagnostic expertise for a safe machine operation.  PROGNOST Systems has the experts and ...


PROGNOST®-NT VISU DCS data analyses and ringbuffer

The interface, which is offered by PROGNOST®-NT, enables bidirectional communication between the monitoring system and the process management system.