Reciprocating Compressor – An Overview of Vibration Issues

from Beta Machinery Analysis

This 2 minute, 30 second video provides an introduction to the nature of vibration, its causes, and steps to improve compressor operation, reliability, and performance. Vibration is the leading cause of maintenance headaches, on high and low speed reciprocating compressors. Primarily directed to owners, operators, packagers, and engineering companies, mechanical engineering students will also find this topic of interest. This is the first of three videos in the series from Beta Machinery Analysis.

Hydraulic Testing & Diagnostics


The Seven Basic Steps of Diagnosis and Testing

1. Know the System

In other words, “Do your homework.” Study the machine technical manuals. Know how the system works. Is it open or closed center? What should the valve settings and pump output be?

Keep up with the latest service bulletins. Read them and then file in a handy place. The problem on your latest machine may be in this month’s bulletin, giving the cause and remedy. You can be ready for any problem by knowing the system. Continue reading

Factors which Influence the Speed of an Air Cylinder

from Womack

This subject will be covered in two parts: (1), those factors to be considered when first designing the system and selecting cylinder bore diameter and, (2), changes which can be made in an existing system to increase cylinder speed.

It is very difficult to calculate and predict the speed of an air cylinder; there are too many variables which influence speed and on which it is difficult to gather accurate data. We must rely mainly on good design practices and use the benefit of past experience. It is better to have the cylinder speed too fast to begin with because it can always be reduced with a speed control valve, but if it is too slow to begin with, it is more difficult to increase its speed later. Continue reading

Hydraulics and HWH Systems

from HWH Corporation

This is a discussion of basic hydraulics which can help with the diagnostics and repair of HWH hydraulic leveling and room extension systems. The first section of this school, “INTRODUCTION TO HYDRAULICS” is a more in-depth study of general hydraulics and should be studied before continuing in this section. “ADAPTATION OF HYDRAULICS” will repeat or review topics that were discussed in “INTRODUCTION TO HYDRAULICS” but is directed more at the way HWH adapts hydraulics to our leveling and room extension systems.

Hydraulic Trouble Shooting

Hydraulic systems can be very simple, such as a hand pump pumping up a small hydraulic jack, or very complex, with several pumps, complex valving, accumulators, and many cylinders and other actuators. Yet, most of the problems encountered in all of these systems are often traced down to a few basic issues. This article will help you to narrow down and solve most hydraulic system problems by focusing in on the most common causes of malfunction and poor performance. Continue reading

Lube Routes vs. Combo PMs: What’s Best? What are the Issues?

In Part 1 of this three-part series, published in the July-August 2009 edition of Machinery Lubrication, I talked about what makes a good preventive maintenance (PM) task and how we need to capture explicit knowledge about each task so that it can be executed with consistent and continuity. Key to this is to ensure that the work instructions include sufficient detail such as grease type and quantity to take the guesswork out of lubrication. In Part 2, I will explore the way in which lubrication PMs are actually provided to the technician, mechanic or operator. Specifically, I will outline what I like to call “hybrid” PMs and the problems they create for controlled management of change. Continue reading